NA62@SPSC101 1

2011NA62 Status Report to the CERN SPSC

Augusto Ceccucci for the NA62 Collaboration

April 5, 2011

5/4/2011

CERN-SPSC-2011-015(SPSC-SR-083)

NA62@SPSC101

•Birmingham•Bristol•Glasgow•Liverpool

•Ferrara•Florence•LNF•Naples•Perugia•Pisa•Rome I•Rome II•Turin

•UC Louvain

•Mainz

•George Mason•SLAC•UC Merced

TRIUMF

•San Luis Potosi

•IHEP•INR•JINR

•CERN

•Bratislava

•Sofia

The NA62 Collaboration

5/4/2011

NA62@SPSC101 3

LHCb has shown similar sensitivity as CDF/D0 with just 1% of the integrated Luminosity accumulated at the Tevatron

The MEG experiment at PSI is searching for the forbidden decay m+ → e+ g

Rare Kaon decays to be studied at CERN-SPS (NA62) and J-PARK (KOTO)

There are projects for future e+e- flavour factories (Japan & Italy)

Plans for ProjectX at Fermilab (m2e) NA62 unique physics goal: Vtd to 8% w/o input from

lattice QCD (in 2 years of data taking) NA62 unique technique: high momentum K+ beam

5/4/2011

Flavour Physics Overview

BRSM(K+ p+ n n ) = (8.22 ± 0.75) × 10-

11

NA62@SPSC101

Measure Kaon:•Time•Angles•Momentum

INFN

4

NA62 Beam & Detectors

Target

Total Length 270m

Decay Region 65m

Gigatracker (GTK)

LAV: Large Angle Photon Veto

RICH

LKr

SAVSmall Angle Veto

MUV

CEDAR

StrawTracker

CHODCharged

Hodoscope

Beam Line + Infra.

UK

SofiaINFN

INFN

INFN

MainzCERN

MexicoUS

IHEPINR

IHEPINR

Belgium

JINRCERN

SPS primary p: 400 GeV/c Unsepared beam:• 75 GeV/c• 750 MHz • p/K/p (~6% K+)

CERN

5/4/2011

CHANTI INFN

NA62@SPSC101 5

(cf. G. Ruggiero and A. Sergi)Physics & Software

5/4/2011

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Reminder of the Technique

5/4/2011

~92% of Kaon decays

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K+pnn Selection Skeleton

5/4/2011

Downstream detector regionp Track

(Straws) Particle ID (RICH, LKr)

Charged particle rej. (RICH, CHOD,

Straw)m Rejection

(MUV)g Rejection (LKr, LAV, IRC,SAC)

Beam line regionBeam Track

(Gigatracker) Particle ID

(CEDAR)

Charged particle rej. (CHANTI)

EventKaon

definition

Kinematics

NA62@SPSC101 8

Reminder: 2007 estimation

5/4/2011

Next Slides: Updated estimation (using new software) for p+p0

NA62@SPSC101 95/4/2011

NA62@SPSC101 105/4/2011

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Kinematics of K+ p+p0

5/4/2011

p+p0 generated◦ 105< Zvtx < 165

m◦ 15 < Pp < 35 GeV◦ p in detector

acceptance

SAC IRC LKR LAV MISSSAC 0 0 1.66 1.26 x 10-2 2.08 x 10-4

IRC 0 8.17 0.40 5.65 x 10-3

LKR 70.35 19.08 0.21LAV 0 0

MISS 0

Photon Acceptance for p+p0

Photon Energy

SAC IRC LKr LAV MISS

12

Small Angle Photon Inefficiency

5/4/2011NA62@SPSC101

Energy of photon IRC SAC0-20 GeV (3.5 ± 0.6) x 10-4 (0.8 ± 0.2) x 10-3

20-40 GeV (0.6 ± 0.2) x 10-4 (0.7 ± 0.2) x 10-3

40-60 GeV (0.3 ± 0.2) x 10-4 (1.4 ± 0.4) x 10-3

Energy dependent because of photonuclear interactions

Not detected conversionsupstream

g in the IRC-SAC acceptance:Interactions in the material in frontof the IRC-SAC.

Beam pipe

Neon

LKr : no clusters in LKr (except for the p+ one) CHOD: Cut on hit multiplicity RICH: Cut on PMT hit multiplicity STRAW: Broad cut on multiplicity SAC-IRC: Deposited energy <40 MeV

pnn selection:

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Effect of passive material in front of the LKr (preliminary)

5/4/2011

Simulation:◦ All the detectors switched

on Selection:

◦ 105< Zvtx < 165 m, 15 < Pp < 35 GeV …

◦ Photons in the LKr acceptance LKr, LAV12, CHOD, IRC/SAC

exploited to detect the possible products of the photon interactions

Fraction of photons lost LKr + LAV12 + SAV + CHOD:

4 x 10-6

NA62@SPSC101 14

K+ p+p0 Rejectio: Analysis Optimization

5/4/2011

BG(pp0

)

Z of decay vertexBG

(pp0

)Pp , MeV

p+p0 control regions

Expected background ~5%

NA62@SPSC101 15

Background from gas interactions

5/4/2011

Simulation of the residual gas: O3 (CO2 from straw and H2O from LAV) Simulation of the interactions: K, p , p with O3 using FLUKA Tracking of the secondaries in the detectors (fast simulation ) Parameterization of calorimeter inefficiency vs particle type (LAV) from full

simulation Apply pnn selection and compute the probability of signal-like events forom

K, p, p interactions NBKG/NSIG computed using NSCATTERERS(Vacuum Pressure) for normalization.

Background from p and p depends linearly on the time window coincidence between CEDAR and RICH.

Single atomK,p,p 75 GeV

Leading particle

Soft particle multiplicity

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Background from gas interactions

5/4/2011

NA62@SPSC101 17

The installation of the beam line is foreseen by October 2011 Ordering has started for most items The beam line axis has been fixed and traced on the floor in

TCC8 and ECN3 Vacuum layout fully defined (agreed Collaboration with TE-

VCS): industrial cryo-pumps is now the baseline solution Studies of the T10 cooling are under way The Blue tanks were cleaned with dry CO2 ice The definition of future ventilation system in ECN3+TCC8 is

still under discussion The beam dump design has been completed A geotechnical survey has taken place (below -20 m the

quality of the rock is poor)

5/4/2011

Beam Line & Infrastructure (cf. Lau Gatignon)

Installation and Schedule

cf. Ferdinand Hahn

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NA62@SPSC101 19

ECN3 MNP33

5/4/2011

2011 2012

J F M A M J J A S O N D J F M A M J J A S O N D

BeamCedar

GTK

Photon Veto

RICH

STRAW

MUVRUN

LAV 1-5

Vessel Nose

ASIC Design

Read-Out Board

Prod.

Cooling Studies

Bond. + Ass.Test

Cooling Design Cool. Constr. + Test

Install M6-8

LAV 6-8 LAV 9-11

Install.

L 12

Install.

Installation

20NA62@SPSC101

Install M9-11M3-5

Construction Vessel

Beam pipe

Constr. Mod. 1 Construction Mod. 3,5+7

M1+2

Install.

MUV 1,2 +3

Tech. Run

Construction Note: not all milestones are shown on this planningInstallation

Milestones

Synchronization Run ???

To be decided this weekTechnical

Run

NA62 Schedule (Overview for main items only )

5/4/2011

NA62@SPSC101 21

# Sub-System Milestone Date Result

1 STRAW Freeze Chamber + Straw Design 01/09/2010 OK

2 GTK GTK Read-out Chip Choice 30/09/2010 OK

3 LAV LAV 1,2,3,4 + 5 Ready 16/02/2011 expect completion by 08/04/11

4 RICH Design for Mirror Supports and Wall Completed 30/06/2011

5 STRAW Module 1 Ready 06/07/2011

6 GTK Freeze Sensor + Chip Design 30/09/2011

7 LAV LAV 6 -8 Ready 30/10/2011

5/4/2011

List of NA62 Milestons (I)

NA62@SPSC101 22

# Sub-System Milestone Date Result

8 STRAW Readout Design Completed and Tested 16/12/11

9 TDAQ TEL62 board ready for final production 31/01/12

10 STRAW Four Modules Ready 15/06/2012

11 RICH Vessel installation ready 30/04/2012

12 Installation Preliminary Vacuum Tube Closing 30/09/2012

13 LAV LAV 8,9,10 + 11 Ready 31/10/2012

14 RICH Mirror and PM Installation complete 02/12/2012

15 ECN3 Final Vacuum Tube closing 15/03/2013

5/4/2011

List of NA62 Milestones (II)

NA62@SPSC101 23

Technical Run in 2012 Following the revised LHC planning (long shut-down in

2013, we have re-optimized our schedule focusing on a technical run in autumn 2012

In this new context a Synchronization Run in November 2011 no longer seems essential

We will decide whether to abandon it or not at the Plenary Meeting later this week

The following systems are expected for the 2012 Technical Run:◦ Beam line, Vacuum system & Beam Dump◦ CEDAR; 3 to 4 Straw Modules, ◦ LAV system (most); RICH vessel, LKr (with existing read-out;

IRC & SAC ◦ MUV system ◦ Old CHOD

5/4/2011

CEDAR(cf. Evgueni Goudzovski)

5/4/2011 NA62@SPSC101 24

1. Test beam in October 2011 for the identified NA62 CEDAR (CEDAR-W-01): test the identified CEDAR as it is (old PMTs and readout), practice with the device and alignment

2. Build and test a prototype of mechanics, covering one optical port, and equip it with a few photo-detectors and prototype readout chain

3. Test radiation tolerance of the TEL62 and readout chain in a muon beam of similar intensity. Verify front-end electronics radiation tolerance with neutron beam exposure in UK (or Louvain)

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CEDAR Plans for the remainder of 2011

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Gigatracker (GTK)(cf. F. Marchetto, A. Kluge, M. Fiorini)

5/4/2011

NA62@SPSC101 27

The ASIC general system architecture has been defined. Threshold DACs have been designed and integrated in the modified discriminator in

the pixel cell. The full pixel matrix was built up. Presently the global biasing structure using DACs and the distribution network is designed.

The TDC-DLL has been modified to reduce power consumption and re-qualified via simulation. The TDC structure (DLL; fine registers; hit Arbiters) have been placed and routed in the 300 mm column. Post layout verification is underway to qualify that block.

The next steps before submission are the design of the end-of-column standard cell logic, the design of the read-out logic and the integration of these building blocks with the pixel matrix.

In parallel hit separation studies with the laser setup have been conducted to verify the behavior of the demonstrator ASIC with respect to particles arriving in the same pixel within short time periods (hit separation studies). The results confirm the correct behavior of the front-end electronics. Furthermore laser pulses were used to understand the silicon signal development for charge releases on different positions within the pixel cell. For the demonstrator a radiation campaign is planned to verify the total dose effects on the assembly.

In parallel the test infrastructure for the ASIC will be built up. As soon as the ASIC pin assignment is frozen, test cards for the single ASIC will be designed and produced.

5/4/2011

GTK: Full-size ASIC Development

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Detail of the full GTK ASIC Design

5/4/2011

Pixel Cell

Hit Arbiter

Pixel matrix

TDC: delay line, charge pump, encoder, fine hit Registers

GTK: Test Beam Analysis Refined analys confirms a

resolution of better than 200 ps per hit for sensor bias voltages higher than 300 V

Time-walk correction and alignment procedures have been validated with real data

Clear dependence of time resolution on sensor bias voltage

The operation at 300 V over-depletion is mandatory

Paper on test-beam results under preparation 

5/4/2011 NA62@SPSC101 29

30

GTK Main progresses since last SPSC meeting (in addition to ASIC design and analysis)• Assemblies: procurement of the dummy sensors and chips (FBK) to study the thinning at IZM

• Cooling:Gas : a) improved the cooling gas path to decrease the temperature non-uniformity of the assembly (measured +/- 5 0C); b) planned a set of test to investigate the mechanical (vibrations) impact of the system.Micro-channel: a)Si-Si bonded wafers have been tested; b) new design of the channel, which are now in production; c) tests on Si-Pyrex (thinned to 200 mm) assemblies continued.

•Mechanical integration:It has been optimized the integration of the assembly carrier card and mechanical infrastructure hosting the assembly

• Off Detector R/O electronics:Test of some of the critical parts of the GTK-RO design on a development kit based on a Stratix IV:a) input transceiver; b) the DDR2 memory; c) Ethernet ports

Drawing of the schematic diagram of the GTK-RO started

NA62@SPSC101 31

Straw Tracker(cf. Hans Danielsson)

5/4/2011

1 Final straw material validation including metallization (Hostaphan RNK2600).

2 The manufacturing of straws in large quantities3 Validation of the straw manufacturing process and

the quality control procedure4 Design and procurement of the module 0 frame

(1/8 of the detector i.e. 896 straws)5 Start-up of the module 0.

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Recent progress

5/4/2011NA62@SPSC101 33

Straw production (SEFAR AG)QC and storage of straws under pressure (1 bar) at CERN

5/4/2011NA62@SPSC101 34

Straw production in Dubna (31-03-2011)

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Vacuum test of the structure

Results: •The measured leak is 0.98mbar*l/min (1.3 times the straws)•Helium leak detection (<10-6 mbar*l/s) was made on all interfaces (beam-to-flange and beam-to-beam)•We need to improve on the temporary seal around the straw holes and add cover at the bottom for the next module

F = 35 000kg !

5/4/2011NA62@SPSC101 36

Module assemblyTooling for spacer fabrication

Spacer in tooling Gas manifold with joints

Spacer fixation

1. From the experience gained with the 64-straw prototype, assemble and test the "module 0", which should full the requirements to be used in the NA62 experiment.

2. This is also a final check of the design and the various components before launching the procurement of the components for the remaining seven modules.

3. Continue cosmic-rays tests of the 64-straw prototype using an independent tracker based on 4 Micromegas modules 1. The aim is to verify the final resolution numbers and to test the FPGA-based TDC read-out (until now we have used the TELL1board). Detector operation will also be tuned.

4. Final beam test with 64-straw prototype and final front-end (with FPGA as TDC on the cover). The previous solution with the TEL62 board is kept as back-up until the new solution is validated.

5. Prepare and start the production of the remaining modules

5/4/2011NA62@SPSC101 37

Plans for the remainder of 2011

NA62@SPSC101 38

RICH(cf. Massimo Lenti)

5/4/2011

NA62@SPSC101 39

RICH

17 m

Beam Pipe

Mirrors•Separate pions from muons <1% level between 15 and 35 GeV/c•Track time at 100 ps level•Partecipate in the L0 trigger

• Neon as Cherenkov radiator• mosaic of mirrors (17 m focal length)• two spots with PM (1000 PM per spot)• beam pipe passing through

PM lodging disk5/4/2011

NA62@SPSC101 40

Vessel (CERN): vacuum proof

Gas system simplified: make vacuum, then inject pure Neon

5/4/2011

NA62@SPSC101 41

Photomultipliers 1944 PM available (quality test ongoing) 1400 HV divider to be ordered (~550 available)

PM holding mechanics in fabrication

FE electronics in preparationAll HV channels already available

5/4/2011

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Photon Vetoes(cf. Antonella Antonelli)

NA62@SPSC101

Construction status since November 2010

43

A3 shipped at CERN beginning of December 2010, some problems during the transport (see later)

A4 completed tested and ready to be shipped at cern, we are currently revisiting the transportation procedure

A5 arrived at LNF February 18, actually 3 out of 5 layers are mounted and tested, we foresees to complete it by mid April (2 months delay respect to the schedule)

5/4/2011

NA62@SPSC101

Design and planning A6-A8, A12

44

A6-A8, A11 Bidding procedure closed adjudicated by Fantini factory, all the drawing have been revisited and the material has been procured.

A6 is actually calendared and will be shipped to LNF end of May.

We foresees to build an test A6-A8 during 2011

A6-A85 layers ∅259 cm

A114 layers∅299 cm

5/4/2011

NA62@SPSC101

Design and planning A9-A10, A12

45

Recall: A9, A10 have same dimensions as A11, but are made of stainless steelA12 has open geometry—design is totally different

A9-A10 drawings will be revised in the next months and we will start the bidding procedure, the idea is to start vessels construction by the end of 2011

A6-A85 layers ∅259 cm

A114 layers∅299 cm

5/4/2011

NA62@SPSC101

Damage to A3 and A2

46

A3: Due to bad weather conditions (M.Blanc tunnel was closed) the transport took 3 days. Even if all precautions where taken, we insulate the vessel by means of fiberglass cover, the temperature in the vessel reached 5 degrees after 2 days in the snow. 10 blocks were broken during transport!

Fractures are most likely from thermal stress•Likely from re-heating from ~4∘ to 15.5∘ at ECN3 (cooling was much slower)•9 of 10 blocks on layers most exposed to ambient temperatureWe have already started A3 repair work in ECN3

6 of 10 blocks repaired

Unfortunately A2 experienced a significant temperature gradient:A2 was shipped to CERN end of JULY 1) All the blocks were checked at CERN before the test beam and they were ok2) The idea was to store all the LAVs in building 185. We were ensured that 185 was air conditioned during summer and heated during winter (including shutdown). A2 was stored in building 185 at the end of August.4) We went to inspect A2 in February and found 22 blocks broken !! 5) The heating in 185 was switched off without notice during the winter shutdown and never restarted6) From now on all the LAVs will be stored in ECN3 and an appropriate temperature monitor has been implemented

5/4/2011

NA62@SPSC101 47

MC for Large Angle VetoesData/MC agreement comparing MIP muons and using test beam data

DataMC

Integrated charge (pC)

Evt

s/0.

5 pC

nominal beam

5/4/2011

48A. Antonelli INFN-LNF SPSC meeting CERN 4 April 2011

2011 Future work•construct and test 3 intermediate diameter vessel A6-A8.

•half of the frontend electronics will be produced tested.

•The mechanics an the relative tools for A9,A10,A12 will be fixed and the bid procedure will be started.

•Test the complete chain, final crates final frontend board and final TEL62

NA62@SPSC101 495/4/2011

LKR Calorimeter(cf. Riccardo Fantechi, G. Lamanna)

NA62@SPSC101 50

LKr readout - 1 Two step approach – First step (2011-2012)

◦ Intermediate solution to read the old CPD modules Installation in 2008 of SLMs (Smart Link Modules) Test done in 2010 to prove the functionality Need two items to be able to use them in 2012

An interface between the new trigger distribution and the legacy NA48 one: the TALK board, see Gianluca Lamanna’s talk

A refurbishment of the old Fastbus power supplies◦ Following a tender for power supply refurbishment, Wiener has been

selected for this job One prototype ready by ~May 10 power supplies (with an option for other 10 at the same price) expected

by the end of summer The old mechanics will be reused, with modern modules and controls inside

◦ Complete the software suite to run the calorimeter Data merging Readout steering Planned to be prototyped during the summer

5/4/2011

NA62@SPSC101 51

LKr readout - 2 Two step approach – Second step (2013- 20xx)

◦ Replace CPD with CREAM Because of CPD reduced rate capability (10 KHz) and obsolescence

32 channel, 14 bit, 40 MHz digitizer, with VME format Powerful FPGA(s) and 8 GB of DDR3 memory on board Ethernet data readout Continuous digitization, two level memories, readout following NA62 specs Able to sustain the full expected 100 KHz L1 rate even non zero

suppressed◦ Preliminary market survey done in 2010, preselection of firms◦ Full specification document almost finalized

To start the tender procedure (IT-3758/PH) Expected to be approved at FC in September 2011 5 prototypes by June 2012 After prototype testing, production of 450 units First batch delivery: March 2013 Complete the installation and commissioning during 2013

5/4/2011

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NA62@SPSC101 535/4/2011

Muon Veto (MUV)(cf. Rainer Wanke)

NA62@SPSC101 54

MUV1: New Module MUV2: NA48 HAC front module (turned 180 deg) MUV3: New Fast MUV after 80 cm iron for fast

trigger veto

5/4/2011

Layout of the MUV

NA62@SPSC101 555/4/2011

NA62@SPSC101 565/4/2011

NA62@SPSC101 575/4/2011

TDAQ, Computing, DCS(cf. Marco Sozzi, Valeri Falaleev)

MS - NA62 TDAQ INFN – Marzo 2011

RICH MUV CEDAR LKRSTRAWS LAV

L0 CTP

GbE switch

PC PC PCPCPC PC PC PCPCPCPCPCPC PC

PC PCPC PC CDRL0 triggerTrigger primitivesData

EB

1 MHz

1 MHz

1 MHz

O(10 MHz)

O(KHz)

NA62 TDAQ - OVERVIEW

1 MHz

L0L1/2

O(<1ms)

2K 1K200

8K 13K 2.5K 60K

M. SozziSPSC refereesmeeting – 4/4/11

MS - NA62 TDAQ INFN – Marzo 2011

TDAQ progress• Technical document completed• Online-computing interface document written• Final (modified) TTC modules being built• Final design of fast (L0 trigger) MUV plane• First meeting on L1/L2 algorithms, simulation

work started• NA48 charged hodoscope can be used for a test

(only!) but requires HW and firmware work• Common crates (“CERN standard”) identified,

prototypes bought, waiting for validation• GPU-based trigger R&D ongoing

MS - NA62 TDAQ INFN – Marzo 2011

TDAQ progress details• TDC boards: new iteration needed, in production now

Firmware debugging still ongoing, test system in preparation. Two commercial solutions for signal cables eventually found.

• TEL62 motherboard: design completed end 2010, layout completed at CERN feb 2011, prototype ready for testing. Large firmware effort to be started.

• L0 Trigger Processor: some real work started on PC-based solution (mainly in Ferrara, with CERN and Pisa contributing). Responsabilities (HW) to be defined.

• Lkr/L0 trigger daughtercards: (1) Trigger RX: done, (2) Trigger/RO TX: prototype in production, (3) LKr interface: to be designed in 2011 (linked to LKr readout). MC simulation work required.

• Started work on common data network interfacing.• LKr readout (tender) document almost ready.• Old LKr readout (temporary) interface card being built.• GTK readout system ongoing smoothly• R&D on FPGA-based TDC solution for Straws

MS - NA62 TDAQ INFN – Marzo 2011

TDAQ plans• TDC boards: test prototype (5/11); produce 12 boards and

distribute to labs for test/assessment (using old TELL1).• TEL62 motherboard: test prototype & validate crate (4-5/11);

iterate and build up to 10 boards by end 2011 for distribution.• L0 Trigger Processor: detailed plan in dedicated meeting

(5/11), choose approach, work towards a demonstrator by end 2011.

• Lkr/L0 trigger: test 1-channel complete chain by summer 2011.

• Finalize crate positions and install clock/trigger network ASAP.• Implement readout interface for old LKr RO by end 2011.• Make radiation tests on (non rad-hard) electronics in 2011.• Choose straws readout solution (1/12).• Define online responsibilities and start implementation.• Detailed realistic plan for 2012 running (+TDAQ dry run?) :

- few (partially-equipped) detectors- old NA48 hodoscope with online slewing correction on GPUs?- replacement for L0TP (LKr temporary interface board?)

Main DCS activities• First extended DCS meeting (December 2010)

o Discussion of User Requirements of LAV, Straw Tracker, MUV and IRC/SAC

o Establishment of a framework for DCS activities , including model of collaboration, sharing of contributions and available resources

o Presentation of prototype of recipe editor• Proposal of CAN bus cable structure• Assessment of ISEG HV power supply model choice (LAV,

MUV, CEDAR, IRC/SAC)o Integration onto JCOP Frameworko Long term hardware and software support

• Rejuvenation of control system of power supplies of LKr electromagnetic calorimetero Reuse of existing cables and patch panelso ELMB based solution for analog inputs (design a custom

board)o PLC technology for digital IO chanelso VME CPU running DIM communication software for HV

controlo PVSS application is under development

NA62@SPSC101 625/4/2011

Plans

• LAV storage area temperature monitoro Monitoring of LAV stations temperatureso Use of ORACLE DB for data storageo NICE user name/password access systemo SMS alerts in case of abnormal temperatures

NA62@SPSC101 635/4/2011

Main activities - 2

• Finalization of URD• Progressive deployment of control solutions in the

experiment• LKr power supply vertical slice application (June 2011)• DCS test run

• Autumn 2011 or Spring 2012 – will be decided soon• Full scale system with most functionalities and a few sub-

detectors• NA62 Technical run in 2012

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NA62/NA48 Publications (since November 2010)

5/4/2011

NA62@SPSC101 655/4/2011

Conference Presentations (Since November 2010

NA62@SPSC101 66

We are taking into account the implications of a postponed LHC shutdown

Collecting NA62 commissioning data –with a partial setup-before the LHC stop is considered to be very important

At the Collaboration Meeting later this week a decision on the 2011 Synchronization Run and a 2012 Technical run is expected

NA62 construction is in full swing, the schedule remains tight The duration of the injector’s shutdown should be as short as

possible First Financial review Committee Scheduled for April 12, 2011 The Collaboration wishes to acknowledge the strong support

provided by CERN and thanks in particular the Support and Technical teams from the PH, EN and TE Departments

5/4/2011

Summary

NA62@SPSC101 675/4/2011

Status of RK=Ke2/Km2 measurement(cf. Evgueni Gudzovski)

NA62@SPSC101 68

• SM prediction: excellent sub-permille accuracy: not obstructed by hadronic uncertainties.• Measurements of RK and Rp have long been considered as tests of lepton universality.• Understood recently: helicity suppression of RK might enhance sensitivity to non-SM effects to an experimentally accessible level.

RK=Ke2/Km2 in the SM

RKSM = (2.4770.001)10–5

RpSM = (12.3520.001)10–5

Phys. Lett. 99 (2007) 231801

Helicity suppression: f~10–5

Observable sensitive to Lepton Flavour Violation:

Radiative correction (few %)due to K+e+ng (IB) process,by definition included into RK

(similarly, Rp in the pion sector)

E. Goudzovski / Moriond EW / 16 March 2011 5/4/2011

NA62@SPSC101 69

RK=Ke2/Km2 beyond the SM

2HDM – one-loop levelDominant contribution to RK: H mediatedLFV (rather than LFC) with emission of n

RK enhancement can be experimentally accessible

Up to ~1% effect in large (but not extreme)tan regime with a massive H

Analogous SUSY effectin pion decay is suppressedby a factor (Mp/MK)4 610–3

2HDM – tree levelKl2 can proceed via exchange ofcharged Higgs H instead of W

Does not affect the ratio RK

PRD 74 (2006) 011701,JHEP 0811 (2008) 042(including SUSY)

Example:(13=510–4, tan=40, MH=500 GeV/c2)lead to RK

MSSM = RKSM(1+0.013).

Large effects in B decaysdue to (MB/MK)4~104:

Bmn/Bn ~50% enhancement;Ben/Bn enhanced by

~one order of magnitude.Out of reach: BrSM(Ben)10–11

E. Goudzovski / Moriond EW / 16 March 2011 5/4/2011

NA62@SPSC101 70

Ke2 candidates

59,813 K+e+n candidates.Positron ID efficiency: (99.270.05)%.

B/(S+B) = (8.710.24)%.

Ke2: partial (40%) data set

cf. KLOE: 13.8K candidates (K+ and K–),~90% electron ID efficiency, 16% background

Source B/(S+B)Km2 (6.110.22)%Km2 (me) (0.270.04)%Ke2g (SD+) (1.070.05)%Ke3(D) (0.050.03)%K2p(D) (0.050.03)%Beam halo (1.160.06)%Total (8.710.24)%

Backgrounds

x5x5

x50

x5

E. Goudzovski / Moriond EW / 16 March 20115/4/2011

NA62@SPSC101 71

NA62 final result (40% data set)

Full NA62 data set: precision will be improved from 0.5% to 0.4%.

Uncertainties

RK = (2.487 ± 0.011stat ± 0.007syst) 10–5

RK = (2.487 ± 0.013) 10–5

Errors in momentum binsare partially correlated

SM

Source RK105

Statistical 0.011Km2 0.005Ke+ng (SD+) 0.001K+p0e+n, K+p+p0 0.001Beam halo 0.001Helium purity 0.003Acceptance correction

0.002

Spectrometer alignment

0.001

Positron ID efficiency 0.0011TRK trigger efficiency

0.002

LKr readout efficiency

0.001

Total 0.013

CERN-PH-EP-2011-004,arXiv:1101.4805,

PLB B698 (2011) 105

E. Goudzovski / Moriond EW / 16 March 20115/4/2011

NA62@SPSC101 72

Spares

5/4/2011

Vacuum Tank Closure

• STRAWS– The chamber completion (3/8 or 4/8 modules), will be just in time for the

run. Missing modules will be replaced by empty frames.– The service installation has to be done in parallel– Little time for commissioning and setting up

• LAV– If LAV10 is missing it will be replaced by the empty vessel.– Service connection of LAV modules will be done in parallel to the installation.

• RICH– We plan to install the RICH vessel in spring 2012.– Market survey is in preparation, however, construction time will only be

known after the tender . – RICH beam pipe (up to LKR) will, perhaps, be temporary.

5/4/2011 NA62@SPSC101 73

How to deal with missing elements ?

Missing detectors will be installed during the shutdown in 2013

NA62@SPSC101 74(courtesy by Christopher Smith)

Kaon Rare Decays and NP

5/4/2011

K+ p+ n n in SM BR≡BR(K+ p+ n n ) BR(SM) = (8.22 ± 0.75) ×

10-11

• J. Brod, M. Gorbahn, E. Stamou arXiv:1009.0947

|Vtd| / |Vtd| ≈ 0.4 Pc/Pc 0.7 BR /BR |Vcb| / |Vcb|

(0,0) (1,0) Pc

h

r

(r,h)

|Vtd| ~(BR )1/2

3 %~2 % (mostly mc) 62 % BNL7% aim of NA62 (2y)

5/4/2011 75NA62@SPSC101

NA62@SPSC101 76

RK world average

World average

RK105 Precision

PDG 2008 2.4470.109

4.5%

Today 2.4870.012

0.5%

Other limits on 2HDM-II:PRD 82 (2010) 073012.SM with 4 generations:JHEP 1007 (2010) 006.

E. Goudzovski / Moriond EW / 16 March 2011

bsgexcluded

5/4/2011

NA62 straw detector electronics

Design of new cover (frontend board) finished◦ functionality

2 CARIOCAs followed by 16 TDCs in low-cost FPGA Board control over 160Mbits/s link Readout over 2 links 400Mbits/s

◦ PCB design planned to start on 5.4.2011◦ Expected to be ready for tests in 6 weeks

Design of new backend, SRB (Straw Readout Board) close to be finished◦ Functionality

Control and receive data from 4 frontend boards Interface to TTC system, if needed VME 6U board

◦ PCB design should start immediately after frontend

5/4/2011 77NA62@SPSC101

78

TDC Design

Design

Description Resolution

Functional &Timing Simulation

TDC 1 Single Counter 3.12ns OKTDC 2 Two 180 º face shifted counters 1,56 ns OK

TDC 3 IP block with a LVDS high speed serial line

1.56 ns OK

TDC 4 2 IP block with a LVDS high speed serial line

0.78 ns OK

TDC 5 4 IP block with a LVDS high speed serial line

0.39 ns OK

TDC 4 has been tested on a FPGA test board

22.5388888888889 6.03611111111111 14.81736111111110

102030

Time Meas. (1 bin = 0.78ns)

22.3506944444445 6.0875 14.83680555555560

10

20

30

Time Meas. (1bin = 0.78ns)

Rising edges [ns] Falling edges [ns]5/4/2011NA62@SPSC101

Sequence of Installation

5/4/2011 NA62@SPSC101 79

LKr MUVRICH2Straw

1Straw

3Straw

4Straw

LAV 1-5

LAV 9-11

LAV 6-8CEDAR GTK

CHANTI

Overview of the Detector

MNP33

Total length ≈ 270m

Beam line and LAV1-5

5/4/2011 NA62@SPSC101 80

LKr MUVRICH2Straw

1Straw

3Straw

4Straw

LAV 1-5

LAV 9-11

LAV 6-8CEDAR GTK

3 vacuumVessel are positioned

MNP33Magnet

Situation today

CHOD + LKR(NA48)

Installation in 2011

first Vacuum test On first section

Expected for Sept.

K12 Beam Line

PrepareSupport

for Beam

Magnet

Beam Dump

Situation in Dec. 2011

RICH vessel, LAV6-8, Muon and SAV

5/4/2011 NA62@SPSC101 81

LKr MUVRICH2Straw

1Straw

3Straw

4Straw

LAV 1-5

LAV 9-11

LAV 6-8CEDAR GTK

Installation in Spring 12Situation in Summer 2012

MNP33

Temp. RICH Beam Pipe ??

2nd Vacuum test

Completion with STRAW and LAV

5/4/2011 NA62@SPSC101 82

LKr MUVRICH2Straw

1Straw

3Straw

4Straw

LAV 1-5

LAV 9-11LAV 6-8

CEDAR GTK

Installation Summer 12Situation in Sept. 2012

MNP33

Temp. RICH Beam Pipe ??

Complete Vacuum Pumping

Ready for the Technical Run

Module Chamber

NA62@SPSC101 83

Update for IRC designA detailed simulation of the geometry of the SAC and IRC was performed taking lead and scintillator plates and the WLS fibers into account. This allowed the final geometry of the IRC to be fixed and to assure that there was no need to put the whole detector inside a vacuum tube. An eccentric cylinder design with the beam pipe passing through was adopted to minimize the muon halo rate. The IRC will be split longitudinally into two parts with holes misaligned in order to assure the best photon detection effciency.

5/4/2011

NA62@SPSC101 84

The existing p-in-n bump-bonded assemblies have been tested up to 400-500 V bias voltage in the laboratory test setup: a further increase on individual assemblies in the test-beam lead to a non-functioning of the chip. Visual inspections indicate that the most likely cause is a discharge that occurred between the sensor and the chip due to the high electric field. A work plan is being discussed with IZM for the deposition of an insulating layer in the sensor corner regions to increase the stability at higher bias voltage (up to 700 V).

Bump-bonding of 100 µm thin chips to full-size sensor has to be demonstrated. Since the final GTK read-out chip (0.13 µm CMOS IBM processing) will not be available before the end of 2011, feasibility studies will be carried out using dummy wafers. Processing of 10 dummy sensor wafers (200 µm thick) has been completed in February 2011 at FBK. A basic layout of the final read-out chip is now available as gds file (approximate overall dimensions, top metal and passivation of pixels and bonding pads) and will be used to produce dummy read-out chip wafers.

Irradiation of p-in-n bump-bonded assemblies will be performed this year. The modification of the read-out PCB to insert a removable daughter card housing the assembly is almost complete. This characterization will be crucial to study sensor and chip behavior at different fluences.

A “Call for Tender” for the final assembly production (i.e. large sensor bump-bonded to 10 thinned read-out chips) will be launched this year, after the definition of a detailed process description and process development steps.

5/4/2011

GTK: Sensor production and Bump Bonding

NA62@SPSC101 85

GTK: Cooling Gas Cooling

◦ Reduced gradient◦ Channel optimization◦ Vibration test done◦ Check of wire bond

stability under nitrogen flow under way

Micro-channel Cooling◦ First Si-Si bonds were

tested◦ Si-Pyrex bonds

extensively studied (Pyrex cover thinned to 200 mm)

5/4/2011

NA62@SPSC101 86

Large angle veto (LAV) “Post-card” 12 LAV stations mounted along

120 meter decay region 6 meters apart

4 different types:◦ 160, 240 blocks; 5 layers in vacuum◦ 240 blocks; 4 layers in vacuum◦ 256 blocks; 4 layers in air

Angular coverage 8-50 mrad Inefficiency < 10-4 from few

hundred MeV to 35 GeV Sensitive elements: 2500 OPAL

barrel calorimeter lead glass blocks

Efficiency measurements with electron beams in 2007:1-e<10-4 for 200 MeV<E<500 MeV

A. Antonelli INFN-LNF SPSC meeting CERN 23 November 2009

A1-A11 Vacuum

5/4/2011