1. Update on GEM Activities for the 12 GeV Program in Hall A at JLab
Kondo GNANVO
University of Virginia (UVa)

2. 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.
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

3. Super Bigbite Spectrometer (SBS) in Hall A @ JLab
General Purpose Spectrometer for 12GeV DIS and SIDIS experiments
High Luminosity Spectrometer: /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, 4-8 GeV/c
Large luminosity
Moderate acceptance
Forward angles
Reconfigurable detectors
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

4. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

5. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
APV25-MPD Readout Electronics for SBS
GEM  FEC  MPD  DAQ
75 mm
49.5 mm
Passive backplane
(optional)
2D readout
Up to 40m
twisted,
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.
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

6. 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
Diode protection against spark
Digital IN/OUT
+ LV
APV25
Chip
ZIF Connectors
Analog output
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

7. 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
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

8. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
APV25-MPD DAQ Software
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

9. 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
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

10. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
MPD data
X-axis t1
Y-axis
X-axis,
t ns
t1 + 50
t ns
t ns
t ns
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

11. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
APV25-SRS raw data
25 ns time samples
128 ADC channels
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

12. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Offline correction of the Common mode
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

13. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
SRS Electronics: pedestal rms vs. nb of time samples
ADC Counts
ADC Counts
3 time samples
6 time samples
7.7
5.2
ADC channels
ADC channels
ADC Counts
ADC Counts
9 time samples
12 time samples 4
3.2
ADC channels
ADC channels
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

14. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Pedestal rms: SRS vs. MPD
ADC counts ~ 15
ADC Counts
ADC channels
MPD
5.2
ADC Counts
ADC channels
SRS
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

15. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
X/Y Charge sharing: SRS vs. MPD
SRS
MPD
SRS
MPD
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

16. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Summary
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)
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

17. GEM Team @ Univ. of Virginia
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
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

18. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Backup
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

19. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

20. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
SRS Electronics: pedestal rms evaluation
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY

21. K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY
Pedestal rms (ADC Counts)
APV0
APV1
APV2
APV3
APV4
APV5
APV6
APV7
APV8
K. Gnanvo - WG5 RD51 Coll. Meeting, Stony Brook University, NY