INFN GEM Front Tracker

2012 Oct 18 / SBS Coll. / JLab E. Cisbani 1

V. Bellini, M. Capogni, E. Cisbani,S. Colilli, F. Giuliani, M. Gricia,

F. Librizzi, M. Lucentini, F. Mammoliti,F. Noto, S. Minutoli, P. Musico,R. Perrino, F. Santavenere ...

INFN / Bari-Lecce, Catania, Genova, Roma-Sanità

SBS Collaboration Meeting

Oct 18-19 2012

JLab

Readout Electronics development will be presented by Paolo Musico

Front Chamber reqs and design• Hit spatial resolution ~ 70 mm• Stand large background (g ~ 250 MHz/cm2, e/p 160 kHz/cm2)• Transverse area at least 40x120 cm2

• Event rate at the level of 20 kevents/s• Reuse in different configurations

2012 Oct 18 / SBS Coll. / JLab E. Cisbani 2

GEM base module 20

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40x50 cm2

• Large GEM module with small dead area • Low material budget/Light Structure• Modular design• Flexible configuration• Balanced weight

• Segmented HVs and individual

protection resistors

• Spacers to keep gap

• Thin PERMAGLAS frame

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Service Frame / Detail

2012 Oct 18 / SBS Coll. / JLab

• External service frame made of smaller segments in

carbon fiber• Rigid structure, can correct small GEM module

bending• Prototyping under production

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Beam test @ DESY / Full Module Size 40x50 cm22

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DGEM = 400, 390, 350 V

3 mm drift gap Ar:CO2 70:304 GeV electron ionization: 28 pairsGain: 17600

charge: 500 ke / 2000 ADC ch

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Parassitic beam test of new electronics/Jul-Aug 2012 20

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2012/CERN Test – Event display 20

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Event

Strip Plane

HV=3750 VSignal > 1000RMS ~ 50

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2012/CERN Test – Signal development

• Signal saturated, and wrong clock phase both fixed

• However, position information are available

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Calibration pulse development

• Left: normal signal

• Bottom: «saturated»

• «Saturation» depends on the baseline level

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Gas Component / Radiation test

• We would like to use differential pressure transmitters at gas inlet and outlet to evaluate pressure drop in the chamber and any potential problem

• Negative Rad Hard Test

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HV divider and Spark counter

• In lab test we use LNF/GEM-HV module with 7 independent HV levels and current feedback.

• In operation we intend to use a voltage divider (based on Olympus/Abruzzio design);

• Working on asimple sparkcounter based onstandard preamcomponents(CREMAT CR110) +some standardmodules

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CREMAT amp. is probably not RAD HARD

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DAQ

Bus Interface

Generic Model(virtual class)

MPDLibrary

Low Level

I2C

Trigger

ADC

Other

High Level

Initialize

Configure

Discovery

Read

WrapperDB

Module

Structured text file for

configuration

Based on libconfig++

Main

Implemented on C++

• Run on Linux

• MPD as independent library

• One configuration file (text

format)

• Use open source libconfig++

• Self consistent output binary

raw data

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Still some work on event readout library

Tested on 3 VME platforms (Struck, CAEN USB and Optical)bug fixed: clock phase was not set properly.

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Catania Tools for assembling / READY to go

• Clean room with gas system

• HV probe box and accessories

• GEM foil Stretcher

• Fiducial pin extractors

• Consumables ...

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Catania Assembling Test and Training

• Used spare/damaged parts of the previous design to get experience in gluing/assembling gems modules (2 dummy modules assembled)

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Material for 6 chambers (18 GEM modules)Frames

Drift foils

GEM foils

Readout

Honeycomb

Service frame

Required 18 18 54 18 18 6

Spare 4 4 14 22 22 (1)

Procured 18 14 5 7 7 -

Ordered 4 3 10 3 1 1

Budget 2012

1 42 8 10 3

Budget 2013

9 4 4 2 (+1)

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1. We have to put a large foils production order before end of Italian

fiscal year, production can be delayed some months (if needed) – in

addition to the CERN «natural» delay

2. We still have some margin for improvements, which will be

considered after assembling and characterization

Short term plan● GEM Chamber:

– Assembling of the first 40x50 cm2 module will start the 22° of October (due to people previous committments)

– Assembling expected to last 2 full weeks (at least)

– characterize the module in lab (with rad. Sources)● Mechanics:

– Service frame prototype in production

– Test service frame on three modules (first proto, training module and first final module)

● Test

– November: Chance to access the RD51 test beam (second week of November)or RICH-CLAS12 at the end of November – most likely

● Electronics

Paolo Talk

Expected to go into «mass» assembling

early next year

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