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Kondo GNANVO
University of Virginia (UVa)
Update on GEM Activities for the 12 GeV
Program in Hall A at JLab
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Outline
• GEM trackers for the Super BigBite Spectrometer (SBS)
• APV25-MPD Readout for SBS
• Test of APV25 systems at UVa.
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Super Bigbite Spectrometer (SBS) in Hall A @ JLab
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Large luminosity
Moderate acceptance
Forward angles
Reconfigurable detectors
• General Purpose Spectrometer for 12GeV DIS and SIDIS experiments
• High Luminosity Spectrometer: 1038 /cm2/s, High background: 500 kHz/cm2 (low energy photons mainly)
• General Purpose will be used in different configurations for 12GeV nucleon elastic form factor and SIDIS experiments
• Forward angle, Large acceptance, Good angular and momentum resolutions: 0.2 mrad, 0.5% @ 4-8 GeV/c
• General Purpose Spectrometer for 12GeV
DIS and SIDIS experiments
• High Luminosity Spectrometer: 1038 /cm2/s,
High background: 500 kHz/cm2 (low
energy photons mainly)
• General Purpose will be used in different
configurations for 12GeV nucleon elastic
form factor and SIDIS experiments
• Forward angle, Large acceptance, Good
angular and momentum resolutions: 0.2
mrad, 0.5% @ 4-8 GeV/c
3
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY 4
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
APV25-MPD Readout Electronics for SBS
GEM FEC 4.0 MPD DAQ
75 mm
49.5
mm
Passive backplane(optional)
2D r
ead
ou
t
Up to 40mtwisted,shielded
copper cable(HDMI)tested
Main features:
• Use analog readout APV25 chips
• 2 “active” components: Front-End card and VME64x custom module
• Backplane acting as signal bus, electrical shielding, GND and mechanical support
• Flex adapters available for “standard” PANASONIC GEM connectors.
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K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
APV25 FE Card• APV25 chip on Front End card based on COMPASS original design
• Bus like digital lines (CLOCK, trigger and I2C) & Low Voltages
• Single differential line for the ANALOG out
• ZIF connectors on the GEM side
• 800 front-end cards needed
Digital IN/OUT + LV
Analog output
ZIF
C
onnectors
Diode protection against spark
APV25Chip
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K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
MPD: Multi Purpose Digitizer• MPD VME controller hosts the
digitization of the analog signals coming from the front-end card.
• Handle all control signals required by the front end cards (trigger/clock/I2C)
• Compliant to the JLab/12 VME64x VITA 41 (VXS) standard
• Designed with the possibility to detach the ADC subcomponent to extend FEC-VME64x distance (expected to be ~7 m)
• 50 modules required
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K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
APV25-MPD DAQ Software
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K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
APV25-SRS Readout Electronics
Main features of the Scalable readout System (SRS):
• 3 main components: APV25 Front-End card and ADC card + Digitizer board
•Data transfer through Gb Ethernet via UDP using DATE software developed by ALICE DAQ
•Decoder + basic data analysis with AMORE Framework provided by ALICE DAQ
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K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
MPD data
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X-axis t1
Y-axis t1
X-axis, t1 + 25 ns
Y-axist1 + 25 ns
X-axis t1 + 50
Y-axis t1 + 50
X-axis, t1 + 75 ns
Y-axist1 + 75 ns
X-axis t1 + 100 ns
Y-axis t1 + 100 ns
X-axis, t1 + 125 ns
Y-axist1 + 125 ns
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
APV25-SRS raw data
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25 ns time samples
128 ADC channels
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Offline correction of the Common mode
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Pedestal rms• Common mode baseline varies with time sample
• This effect is corrected in AMORE software both for pedestal data and event data as well
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
SRS Electronics: pedestal rms vs. nb of time samples
4
7.7
3.2
5.2
3 time samples 6 time samples
9 time samples 12 time samples
AD
C C
ount
sA
DC
Cou
nts
AD
C C
ount
sA
DC
Cou
nts
ADC channels
ADC channels
ADC channels
ADC channels
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K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Pedestal rms: SRS vs. MPD
ADC counts ~ 15
ADC Counts
ADC channels
5.2
AD
C C
ount
s
ADC channels
SRS
MPD
Page 14
• Pedestal rms 3 times higher for the MPD w.r.t SRS
• This effect could be in part because the common mode baseline is not yet integrated in the MPD decoder software
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
X/Y Charge sharing: SRS vs. MPD
Page 15
MPD
MPD
SRS
SRS
Summary
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY Page 16
Have both APV based SRS and MPD Electronics setup at UVa APV25-MPD is the readout system for the SBS GEM trackers Both system are working properly and the performances are comparable We have about 5K electronic channels available with the 2 system Data APV25-MPD system have a higher noisy in part because of common mode baseline
offset not correct
To do Develop apv25 FE card with Panasonic connectors for MPD system Develop a more robust analysis software package for MPD electronics. Integration of the APV25-SRS and APV25-MPD into JLab DAQ system (CODA)
GEM Team @ Univ. of Virginia
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Senior Research Scientist:
Prof. Nilanga Liyanage, Dr Vladimir Nelyubin
Research Scientist:
Dr Kondo Gnanvo
Students:
Kiadtisak Saenboonruang, Chao Gu, Xinzhan Bai, Taylor Sholtz, Seth Saher …
SBS Coll. Colleagues in Italy
INFN Roma (Sanita)
Dr. Evaristo Cisbani
INFN Catania
Prof. Vincenzo Bellini
INFN Genova
Dr. Paolo Musico
Page 17
Backup
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY Page 18
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY Page 19
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY 20
SRS Electronics: pedestal rms evaluation
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Pedestal rms (ADC Counts)
APV0 APV1 APV2
APV3 APV4 APV5
APV6 APV7 APV8
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