The TOTEM Roman Pot Electronics System G. Antchev * On behalf of the TOTEM Collaboration

1Gueorgui ANTCHEV NEC 2011 – Varna, Bulgaria

The TOTEM Roman Pot Electronics SystemG. Antchev *

On behalf of the TOTEM Collaboration

* INRNE-BAS, Sofia, Bulgaria

[email protected]

mailto:[email protected]


• Introduction

• On-detector Electronics

• Counting Room Electronics

• System Overview

• Summary

Outline of the talk


Same scheme on both sides of IP5

147m

220m

10m 4m

Roman Pot

T1 Cathode Strip Chambers (CTS)

T2 Gas Electron Multiplier (GEM)

Inelastic TelescopesT1: 3.1 < |h| < 4.7

T2: 5.3 < |h| < 6.5

TOTEM Detectors


10σ beam

sensors in garage position

Beam pipe

sensors in data taking position

beam injectionstable beams

Roman PotPhoto of sector 5-6 220m near RP unit

Horizontal

Verticals


Technology• Very High Resistivity Si n-type <111>, 300um thick• Standard planar technology fabrication Design• Single sided detector, 512 microstrips (pitch 66 m) strips at 45° from the “sensitive” edge;• Voltage Terminating Structure (VTS) on non-sensitive edges• Current Terminating Structure (CTS) on sensitive edges (50 m)

Only 50m from end of strip to end of sensor!!!

The Edgeless SensorPitch adapter on detector VFAT / APV25 compatible


On-Detector Electronics – 1

• 128 channels of tracking front end, digital storage and data transmissions;

• 8 programmable trigger outputs;• Radiation hard technology;• ~160 / 8 bit registers controlling the chip

are programmable through its I2C interface;

• Designed in PH-ESE group CERN.

VFAT 2 Readout Chip

Photo of the VFAT 2 mounted on GEM Hybrid


On-Detector Electronics – 2Silicon Detector Hybrid

• Carries detector and 4 VFAT2 readout chips and a Detector Control Unit (DCU) chip;

• Connected to the outside world by means of an 80 pin connector linked to a flat cable;

• On the same connector the HV and LV power, clock and trigger signal, and also connections to PT100 for temperature control;

• The VFAT2 is biased internally so as to simplify the design of the hybrid.


On-Detector Electronics – 3Silicon Detector Package

• Stack of 10 hybrids;• Flipping the hybrid and mounting it

face-to-face with the next one result in orthogonal strips giving the U and V coordinate information;

• All electrical components are mounted on one side to avoid losing space between the hybrids.


On-Detector Electronics – 4Roman Pot Motherboard – Block

Diagram


On-Detector Electronics – 5Roman Pot Motherboard and its Mezzanines


On-Detector Electronics – 6Digital Opto Hybrid (DOHM) – receives optical control data, converts it to electrical form and connects to the RPMB with two 20pin 3M connectors;

Communication and Control Unit (CCUM) – decodes the information from DOHM and provides 16 I2C interface channels and one 8 bit parallel control port for use on the RPMB;

Trigger VFAT2 Mezzanine – receives trigger information and defines the time reference in the trigger data stream;

Coincidence Chips (CC) – make coincidence from the trigger bits, one for U and one for V;

Radiation Monitor (RADMON) – carrier card


Counting Room Electronics – 1• The TOTFED has to receive and handle the tracking data and trigger building from the

TOTEM detectors;

• Used in the data acquisition and trigger systems;

• Based on the VME64x standard and modular;

• Very flexible and programmable to deal with the different TOTEM sub-detectors

- possible evolution of the data treatment and trigger algorithms over the whole duration

of the experiment

• Acquires on-detector data from up to 36 optical links and:

- performs fast data treatment (data reduction, consistency checking, etc...);

- transfers to the next level of the system;

- stores data on request for readout via VME64x or USB2.0.

• Compatible with CMS:

- permits TOTEM to run both standalone and together with CMS

The TOTEM Front End Driver (TOTFED)


VME6

4x

VME64xInterface

MAIN 1

Loca

l Bus

Spy 1Memory

OpRX 1+

S-Link64

MAIN 2

Spy 2Memory

OpRX 1+

S-Link64

MAIN 3

Spy 3Memory

OpRX 1+

S-Link64

CCS/ TTSOptional

To S-Link64

J TAG

CLOCKCLOCK

USB 1

USB 2

USB 3

TTCrxQPLL

MergerFPGA

Spy 4Memory192bits 64bits 32bits

64bits

32bits

32bits

32bits

16bits

16bits

16bits

USB 4

Local Bus16bits

Buffers

VME6

4x

VME64xInterface

MAIN 1

Loca

l Bus

Spy 1Memory

OpRX 1+

S-Link64

MAIN 2

Spy 2Memory

OpRX 1+

S-Link64

MAIN 3

Spy 3Memory

OpRX 1+

S-Link64

CCS/ TTSOptional

To S-Link64

J TAG

CLOCKCLOCK

USB 1

USB 2

USB 3

TTCrxQPLL

MergerFPGA

Spy 4Memory192bits 64bits 32bits

64bits

32bits

32bits

32bits

16bits

16bits

16bits

USB 4

Local Bus16bits

Buffers

Gigabit Optical INPUT

640Mb/s/fiber x 12 = 7.68Gb/s

VME64x OUTPUT

40MB/s BLT

Data Bandwidth

S-Link64 OUTPUT

480MB/s 64bit@60MHz

USB2.0 OUTPUT

480Mb/s – high 12Mb/s – full320Mb/s – effective

TOTFED has:INPUT - 3 x OptoRX -> 3 x 7.68Gb/s OUTPUTS - 4 x S_Link64 -> 4 x 480MB/s

- 4 x USB2.0 -> 4 x 320Mb/s- 1 x VME64x -> 40MB/s

TOTEM ExperimentTrigger Rate - 1 kHzEvent Size - 40 kBytes

S_Link64 OUTPUT

480MB/s 64bit@60MHz

Block Diagram

Counting Room Electronics – 2


Counting Room Electronics – 3 Main Characteristics

• 9U VME64x Slave;• Local Bus Master 32bits/40MHz;• 18MB Spy Memory: - 3x 6MB per 12 optical channels (1 OptoRX), 96bits at 80MHz; • 3x Main Bridge + Memory Controller;• 3x USB 2.0 Interface;• Merger + 6MB Memory + 4th USB;• TTCrx, QPLL and CCS clocks (optical or electrical);• TTS copper link;• JTAG controller on board;• Connectors for: - 3x OptoRX; - 1x DRM or Trigger Mezzanine; - 3x S-Link64 + 1x S-Link64 on rear at 200MB/s;• 2x Optional Board Connectors;• Board t0 measurements


220

18

RP1 Patch Panel

RP2

RP3

RP4

RP5

RP6

TOTFED

TTCci

147RP1 Patch

Panel

RP2

RP3

RP4

RP5

RP6

TOTFED

18

147

18

RP1 Patch Panel

RP2

RP3

RP4

RP5

RP6

TOTFED

FEC

220RP1 Patch

Panel

RP2

RP3

RP4

RP5

RP6

TOTFED

18

4-5 5-6

32

8168 16

Data Data Data Data

Cont

rol

Counting Room

Detectors

Readout CrateCAEN

TOTFED

FEC

TOTFED

TOTFED

LV1A

System Overview – 1

DAQ System • data taking at up to ~ 1KHz over VME64x at ~

40MB/s;• S-Link64 later within CMS at ~200MB/s;• 240 Si detectors to be read and 122880 channels, which is covered by 960 VFAT2 chips


220RP1 Patch

Panel

RP2

RP3

RP4

RP5

RP6

TOTFED

TTCci

147RP1 Patch

Panel

RP2

RP3

RP4

RP5

RP6

12 12

147RP1 Patch

Panel

RP2

RP3

RP4

RP5

RP6

TOTFED

FEC

220RP1 Patch

Panel

RP2

RP3

RP4

RP5

RP6

4-5 5-6

12 1232

8168 16

Trigg Trigg

Cont

rol

Counting Room

Detectors

Trigger CrateCAEN

GLOBAL

TRIG

TRIG

TRIG

TRIG

TRIG

TRIG

LV1A


Trigger System • optical from 12 fibres per station into 4 TOTFED• electrical 12 cables only from 220m stations using repeaters


220

18

RP1 Patch Panel

RP2

RP3

RP4

RP5

RP6

TOTFED TOTFED

TTCci

147RP1 Patch

Panel

RP2

RP3

RP4

RP5

RP6

TOTFED

1812 12

147

18

RP1 Patch Panel

RP2

RP3

RP4

RP5

RP6

TOTFED TOTFED

FEC

220RP1 Patch

Panel

RP2

RP3

RP4

RP5

RP6

TOTFED

18

4-5 5-6

12 1232

8168 16

TriggData Data

TriggData Data

Cont

rol

Counting Room

Detectors

Trigger CrateCAEN

GLOBAL

TRIG

TRIG

TRIG

TRIG

TRIG

TRIG

LV1A

Readout CrateCAEN

TOTFED

FEC

TOTFED

TOTFED

LV1A



System Overview – 3Photo of the RP DAQ crate


Photo of the Trigger crate



Summary1. The TOTEM Experiment with its Roman Pot detectors has been set up in a

relatively short time: TDR in 2004 and first data taking in 2009 with RP@220m;

2. Complete installation of RP@147m and T1 detector done during 2010 winter shutdown;

3. The Roman Pot Electronics System is the result of the joint efforts and participation of several collaborators;

4. The overall performance of the Roman Pot with its edgeless silicon detectors is excellent. The effort spent in the development and construction of the experiment has started to pay off with physics results;

5. The proton-proton elastic scattering has been measured by TOTEM experiment at CERN in special dedicated runs with Roman Pot detectors using the described above electronics system. The results are published in EPL journal: http://cdsweb.cern.ch/record/1361010/files/CERN-PH-EP-2011-101.pdf

http://cdsweb.cern.ch/record/1361010/files/CERN-PH-EP-2011-101.pdf

http://cdsweb.cern.ch/record/1361010/files/CERN-PH-EP-2011-101.pdf


Thank you

Documents

The TOTEM Roman Pot Electronics System G. Antchev * On behalf of the TOTEM Collaboration