INFN GEM Front Tracker
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
2012 Oct 18 / SBS Coll. / JLab
E. Cisbani
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Front Chamber reqs and design
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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
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2012 Oct 18 / SBS Coll. / JLab
GEM base module
40x50 cm2
E. Cisbani
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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
• External service frame made of smaller segments in
carbon fiber
• Rigid structure, can correct small GEM module
bending
• Prototyping under production
2012 Oct 18 / SBS Coll. / JLab
E. Cisbani
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2012 Oct 18 / SBS Coll. / JLab
Beam test @ DESY / Full Module Size 40x50 cm2
E. Cisbani
DGEM = 400, 390, 350 V
3 mm drift gap Ar:CO2 70:30
4 GeV electron ionization: 28 pairs
Gain: 17600
 charge: 500 ke / 2000 ADC ch
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2012 Oct 18 / SBS Coll. / JLab
Parassitic beam test of new electronics/Jul-Aug 2012
E. Cisbani
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Event
Strip Plane
HV=3750 V
Signal > 1000
RMS ~ 50
2012 Oct 18 / SBS Coll. / JLab
2012/CERN Test – Event display
E. Cisbani
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2012 Oct 18 / SBS Coll. / JLab
2012/CERN Test – Signal development
E. Cisbani
• Signal saturated, and wrong clock phase  both fixed
• However, position information are available
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• Left: normal signal
• Bottom: «saturated»
• «Saturation» depends
on the baseline level
2012 Oct 18 / SBS Coll. / JLab
Calibration pulse development
E. Cisbani
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• 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 / SBS Coll. / JLab
Gas Component / Radiation test
E. Cisbani
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0
E. Cisbani
• 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 a
simple spark
CREMAT
amp. is
counter based on
probably not
standard pream
RAD HARD
components
(CREMAT CR110) +
some standard
modules
2012 Oct 18 / SBS Coll. / JLab
HV divider and Spark counter
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DAQ
Implemented on C++
• Run on Linux
Main
• MPD as independent library
• One configuration file (text
format)
MPD
Bus Interface
Generic Model
(virtual class)
Wrapper
Library
Low Level
High Level
• Use open source libconfig++
• Self consistent output binary
Initialize
Trigger
Configure
ADC
Discovery
Other
Read
Module
Structured text
file for
configuration
Based on
libconfig++
E. Cisbani
raw data
I2C
DB
2012 Oct 18 / SBS Coll. / JLab
DAQ Software
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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• Clean room with gas system
• HV probe box and
accessories
2012 Oct 18 / SBS Coll. / JLab
Catania Tools for assembling / READY to go
• GEM foil Stretcher
• Fiducial pin extractors
• Consumables ...
E. Cisbani
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3
• Used spare/damaged
parts of the previous
design to get experience
in gluing/assembling
gems modules (2
dummy modules
assembled)
2012 Oct 18 / SBS Coll. / JLab
Catania Assembling Test and Training
E. Cisbani
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4
Frames Drift foils
GEM foils
Readout
Honeycomb
Service
frame
Required
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54
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18
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Spare
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4
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22
22
(1)
Procured
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14
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7
7
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Ordered
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10
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42
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10
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9
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2 (+1)
Budget 2012
Budget 2013
fiscal year, production can be delayed some months (if needed) – in
E. Cisbani
1. We have to put a large foils production order before end of Italian
2012 Oct 18 / SBS Coll. / JLab
Material for 6 chambers (18 GEM modules)
addition to the CERN «natural» delay
2. We still have some margin for improvements, which will be
considered after assembling and characterization
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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)
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2012 Oct 18 / SBS Coll. / JLab
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– characterize the module in lab (with rad. Sources)
Mechanics:
– Service frame prototype in production
E. Cisbani
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– 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
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Electronics
 Paolo Talk
Expected to go into
«mass» assembling
early next year
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