Overview of detector requirements

Purpose:

To put today’s session into context.

Steve Watts and Krzysztof Piotrzkowski

WHAT IS THE PHYSICS WE WANT TO DO ???????????? Plenty of diffractive events (SD and DPE) Physics programme in QCD and photoproduction.

Two exciting new physics production processes

Central Exclusive Production (CEP) Khoze, Martin and Ryskin.

and using the LHC as a photon-photon collider – photon-photon physics

Quantum number selection rule.High precision mass measurementindependent of decay channel

See few events => JPC = 0++

Production very large. Well knowncross sections for SM and BSMprocesses: SUSY production andanomalous couplings

cf. High energy photon collisions at the LHC – CERN April 2008

CDF arXiv 0902.1271

9.30 am : FORWARD DETECTORS AT LHC

Chair: Andrew Brandt9.30: Overview of detector requirements - Krzysztof Piotrzkowski, Steve Watts (25+5) 10.00: Machine Interface (Hamburg pipe and Connection Cryostat) - Detlef Swoboda (25+5) 10.30: Fast timing (GASTOF Update) - Krzysztof Piotrzkowski (25+5) 11.00 am : Coffee

Chair: Krzysztof Piotrzkowski11.30: AFP Timing Electronics - Jim Pinfold (15+5)11.50: Reference Timing - Jeff Gronberg (15+5) 12.10: Reference Timing and Fermilab test beam - Mike Albrow (15+5)12.30: 3D sensor development - Cinzia Da Via (25+5) 1.00 pm : Lunch

Chair: Jim Pinfold2.00: Laser testing and MCP lifetime plans - Andrew Brandt (25+5)2.30: Fiber detector studies - Weilin Yu (25+5)3.00: AFP tracker plans - Steve Watts (10+5)3.15: AFP Tracker Mechanics - Ray Thompson (15+5) 3.35: Forward detector alignment - Peter Bussey (25+5) 4.00 pm : Afternoon Tea 4.30 pm: 3D sensor plans for HPS – Marta Ruspa

4.50 pm: Round Table - Future Plans - All (55+5) 7.30 pm Dinner

History

2000

Technical ProposalDue end 2010

CMS – High Precision Spectrometers (HPS)At 240 and 420 m

AFP and ATLAS

Two stations at 220 and 420m to detect leading protons, integrated into the LHC

High precision massspectrometer using the LHC 70 – 1400 GeV/c2

420 m28 7x8 mm2 sensorsper tracking station4 stations required.or 14 FE-I4 sensors220m14 FE-I4 sensorsor 60 FE-I3 sensors

DETECTOR REQUIREMENTS• Must get as close as you dare to the beam or acceptance lost.

Edgeless detectors ( Cinzia Da Via and Marta Ruspa) + Hamburg Pipe

Design compatible with collimator design. Liaison with machine division is vital. ( Detlef Swoboda)

• Tracking precision. One micro-radian or 10 micron with 10 m telescope (Ray Thompson). Sensor + Readout chip must withstand very high radiation levels.• 420 region is at 1.8 K. New Connection Cryostat.• Pile up. Timing detectors with 10 ps or better precision. High rates and lifetime issues for MCP/PMT tube design, (Krzysztof Piotrzkowski, Andrew Brandt) New Reference Timing System ( Mike Albrow, Jeff Gronberg)• Very important to trigger on protons at 220 ( or 420 if you can). Higgs to bb channel. ( Jim Pinfold, Weilin Yu )

• Systems must be compatible with operation in LHC tunnel. Radiation levels and overall need for safe and reliable operation• Calibration and alignment of a precision spectrometer – how ? ( Peter Bussey)

More recent acceptance studies (P. Bussey)….

Acceptance for 420+420, 420+220 and 220+220. Numbers mean total distances. 420 at 6 mm everywhere (can do much better than this !)220 varying from 2mm to 7mm.

HPS acceptance with newest LHC optics m

12/2009 K. Piotrzkowski 8

Note: 2mm approach introduce some shadowing of HPS420

N. Schul & J. de FavereauUsing two-photon spectra!

Radiation levels - summary

6/12/2008 Forward Physics at the LHC 10

Location Distance from IP [m]

Dose[Gy]

h > 20 MeV[cm-2]

1Mev Eq.[cm-2]

Q6 220 1 3x108 2x109

RR13,17,53,57

250 0.5 1x108 1x109

Q11 430 500 9x1011 2x1012

FP420 space 416-430 700 1x1012 1x1013

MB11A 440 12 4x1010 2x1011

MB11B 450 10 3x1010 1x1011

Annual levels for nominal LHC

T. Wijnands, TS Department

Relevant to the support electronic systems in the tunnel and cooling system

NOW ON WITH THE SHOW