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 MeetingOct 18-19 2012
JLabReadout 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 2012 Oct 18 / S
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Coll. / JLab
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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
E. Cisbani 4
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 cm22012 O
ct 18 / SB
S C
oll. / JLabE
. Cisbani
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 2012 Oct 18 / S
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2012/CERN Test – Event display 2012 Oct 18 / S
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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
2012 Oct 18 / S
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Coll. / JLab
E. C
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Calibration pulse development
• Left: normal signal• Bottom: «saturated»• «Saturation» depends
on the baseline level
2012 Oct 18 / S
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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
2012 Oct 18 / S
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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
2012 Oct 18 / S
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Coll. / JLab
E. C
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CREMAT amp. is probably not RAD HARD
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E. C
isbani
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
DAQ Software 2012 Oct 18 / S
BS
Coll. / JLab
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 ...
2012 Oct 18 / S
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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)
2012 Oct 18 / S
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Coll. / JLab
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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 1Budget 2012
1 42 8 10 3
Budget 2013
9 4 4 2 (+1)
2012 Oct 18 / S
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Coll. / JLab
E. C
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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
2012 Oct 18 / SB
S Coll. / JLab
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