Nilanga Liyanage University of Virginia UVa GEM Team Dr. Kondo Gnanvo, Dr. Vladimir Nelyubin,...
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Nilanga Liyanage University of Virginia UVa GEM Team Dr. Kondo Gnanvo, Dr. Vladimir Nelyubin, Kiadtisak Saenboonruang, Chao Gu, Xinzhan Bai, Jie Liu, Seth
Nilanga Liyanage University of Virginia UVa GEM Team Dr. Kondo
Gnanvo, Dr. Vladimir Nelyubin, Kiadtisak Saenboonruang, Chao Gu,
Xinzhan Bai, Jie Liu, Seth Schcher, Taylor Scholz
Slide 2
Front Tracker Geometry x6 18 modules In Italy 50 cm x 40 cm and
50 cm x 50 cm Modules are assembled to form larger chambers with
different sizes Front tracker: Six 40 cm x 150 cm GEM layers built
in Italy INFN Polarimeter trackers: Eight 50 cm x 200 cm GEM layers
to be built in Virginia 2 40 modules At UVa GEM module production
starting now Total Area ~ 16 m 2 SuperBigbite GEM Trackers
Slide 3
4 GEMs with APV25- front end for card seach of the 8
Polarimeter chambers New design for the SBS GEMmodules for
polarimeter trackers by Kondo Gnanvo Need 32 modules + 8
spares
Slide 4
Setup and instrumented the GEM lab Constructed two 40 cm x 50
cm prototypes based in the Rome design First chamber under testing
now. Kondo finalized the new design based on lessons learned.
Progress so far
Slide 5
5 N 2 HV Test Box Pico-ammeter Storage Shelves Stretching
Device Display Monitor Storage Cabinet Ultrasonic bath Our Class
1000 Clean Room (3.5 3 m 2 ) Built originally for the BigBite drift
chambers construction Located in a large (4.5 m x 9 m) semi-clean
area. Additional clean room to be added later this year UVa GEM Lab
Mechanical stretching device HV Test N2 Gas box Keithley
Picoammeter 6487 with 500 V source Ohmmeter Ultrasonic bath
(Elmasonic S900H ) APV25 based readout systems with 5000 channels
for testing GEMs Wiener MPOD High Voltage system
Slide 6
6 N 2 HV Test Box Pico-ammeter Storage Shelves Stretching
Device Display Monitor Storage Cabinet Ultrasonic bath Our Class
1000 Clean Room (3.5 3 m 2 ) Built originally for the BigBite drift
chambers construction UVa GEM Lab Mechanical stretching device HV
Test N2 Gas box Keithley Picoammeter 6487 with 500 V source
Ohmmeter Ultrasonic bath (Elmasonic S900H ) APV25 based readout
systems with 5000 channels for testing GEMs Wiener MPOD High
Voltage system
Slide 7
7 N 2 Box for HV test of GEM Foils Resistors soldered on GEM
Assembly Steps of the SBS GEM Prototype at UVa
Slide 8
8
Slide 9
9 Preparation of the readout board Stretching of GEM foils
Assembly Steps of the SBS GEM Prototype at UVa
Slide 10
10 Test frames glued
Slide 11
X-axis t1 Y-axis t1 X-axis, t1 + 25 ns Y-axis t1 + 25 ns First
results from SBS GEM Prototype: MPD readout
Slide 12
First results from SBS GEM Prototype: SRS readout Distribution
of the mean ADC count: Gain uniformity Y-axis (mm) X-axis (mm) X/Y
(ADC) = 1.12
Slide 13
First results from SBS GEM Prototype: SRS readout Distribution
of the mean ADC count: Gain uniformity Y-axis (mm) X-axis (mm) X/Y
(ADC) = 1.12
Slide 14
14
Slide 15
SBS GEM Chamber Gain Calibration
Slide 16
Test pulse = 360 mV, Capacitor = 3.3 pF Equivalent charges =
7.2 Million e- Injected charges = Equivalent charges / Attenuator
attenuation 3dB to 39 db Pulse generator 360 mV Attenuator 3db to
39 db Capacitor box 3.3 pF GEM chamber readout 50 m APV25
Electronics (MPD and SRS) External trigger Signal form one strip
APV 25 Gain Calibration Just did this calibration for both SRS and
MPD systems
Slide 17
Pedestal Noise RMS distribution for 128 stripes ADC chan.
Slide 18
Module of 50x50cm 2 to replace the 40x50cm 2 32 modules to be
built instead of 40 for the 8 Polarimeter chambers Wider GEM frames
along x-axis Width of 30 mm instead of 8 mm Better stretching
alignment holes away from active area Wider readout support frame
along x-axis (74 mm) Room for strips connectors and GEM HV sectors
electrodes No protective resistors on the GEM foils External
resistor boards Gas system same as in Evaristo design New design
for the SBS GEM polarimeter trackers from Kondo Gas inlet Gas
outlet window Drift cathode GEM foil 1 GEM foil 2 GEM foil 3
Slide 19
GEM Foil with HV sectors 12 HV sector electrodes Alignment
holes gas holes 600 mm 590 mm 562 mm
Slide 20
GEM Frame with outer frame 572 mm 528 mm 572 mm 512 mm 562
mm
Slide 21
GEM Frame without outer frame after assembly 572 mm 512 mm 528
mm
Slide 22
GEM Foil with HV sectors
Slide 23
GEM Foil with HV sectors after assembly 600 mm 528 mm
Slide 24
GEM Foil with HV sectors on its frame after assembly
Slide 25
Readout Support with its outer frame 572 mm 528 mm Up to 660 mm
to be decided with Rui 245 mm 10 mm 245 mm 100 mm 562 mm
Slide 26
Readout Support with its outer frame
Slide 27
Keeping the outer frame during assembly Fixation holes
Alignment holes
Slide 28
Readout support after assembly 528 mm Up to 660 mm to be
decided with Rui
Slide 29
Y-Strips connectors on flexible PCB 80 mm 49.5 mm APV-25 FE
cards (Italian Electronics) on scale on the readout board Panasonic
connectors X/Y readout board with Panasonic connectors and Italian
APV25 based electronics
Slide 30
SBS GEM with APV25 FE cards (Italian Electronics)
Slide 31
Frame Design
Slide 32
4 SBS GEMs with APV25-FE for each of the 8 Polarimeter
chambers
Slide 33
Install new clean room and upgrade equipment. Parts for two 50
cm x 50 cm prototypes ordered expect delivery by December. Complete
the construction of prototypes by February. March to May 2013.
Characterize the chambers, finalize the design and order parts for
8 (?) chambers. Order Electronics for 8 chambers Proposed
production schedule May 2013 May 2014 8 modules May 2014 May 2015
16 modules May 2015 May 2016 16 modules It is crucial that we get
our GEM foil orders out as soon possible. Future plans