kondo gnanvo university of virginia (uva) update on gem activities for the 12 gev program in hall a...
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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 - WG1 RD51 Coll. Meeting, Stony Brook University, NY 2
Outline
• Experiments in Hall A for the 12 GeV CEBAF at Jlab.
• GEM R&D Activities at University of Virginia (UVa).
• New design for the SBS Back Tracker GEMs.
• Plans for large area GEM R&D.
The 12 GeV CEBAF at Thomas Jefferson National Laboratory (Jlab)
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CEBAF: Continuous Electron Beam Accelerator Facility
Beam energy : 11/12 GeV
Beam power : 1 MW
Beam current (Hall A/D): 85/5 µA
Beam polarization: 85%
Emittance @ 12 GeV: 10 nm-rad
Energy spread @ 12 GeV: 0.02%
Beam spot ; ~ 0.1mm
Simultaneous beam delivery Up to 3 halls
Super Bigbite Spectrometer (SBS) in Hall A @ JLab
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Large luminosity
Moderate acceptance
Forward angles
Reconfigurable detectors
GEP5 setup
• G e n e r a l P u r p o s e S p e c t r o m e t e r f o r
1 2 G e V D I S a n d S I D I S e x p e r i m e n t s
• H i g h L u m i n o s i t y S p e c t r o m e t e r :
1 0 38 / c m 2/ s , H i g h b a c k g r o u n d : 5 0 0
k H z / c m 2 ( l o w e n e r g y p h o t o n s
m a i n l y )
• G e n e r a l P u r p o s e w i l l b e u s e d i n
d i f f e r e n t c o n f i g u r a t i o n s f o r 1 2 G e V
n u c l e o n e l a s t i c f o r m f a c t o r a n d
S I D I S e x p e r i m e n t s
• F o r w a r d a n g l e , L a r g e a c c e p t a n c e ,
G o o d a n g u l a r a n d m o m e n t u m
r e s o l u t i o n s : 0 .2 m r a d , 0 .5 % @ 4 - 8
G e V / 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
Requirement for SBS Tracking
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Choice of the GEM Technology
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Design done by E. Cisbani (INFN Roma, Italy)
50 x 40 cm2 modules are assembled to form larger
chambers with different sizes
Front Tracker: Six 40 cm x 150 cm2 GEMs
• INFN Funding: to be built in Italy (E.
Cisbani, Roma, Catania)
Back Trackers: Eight 50 x 200 cm2 GEMs
• 40 to be built in Univ. Of Virginia
×6
18 modulesIn Italy
40 modulesIn Virginia
×(4+4)
Back TrackersFront Trackers
SBS GEM Design
Front Trackers HV Terminal
Reference holes
Gas In/Out
ZIF
terminal
(0.3 mm
pitch)
Protection resistors on each HV sectors
20 HV sectors on one sid
e of the GEM
SBS GEM Design
K. Gnanvo - WG1 RD51 Coll. Meeting, Stony Brook University, NY
COMPASS 2D strip readout
Original design with ZIF connectors
UVa proto I used Panasonic connectors
Grounded ring to connect to the FE card GND
8
R/O with P
anasonic c
onnectors @
UVa
Design done by E. Cisbani (INFN Roma, Italy)
Our Class 1000 Clean Room (3.5 × 3 m2 )
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N2 HV Test Box
Pico-ammeter
Storage Shelves
Stretching Device
Display
Monitor
Storage Cabinet
Ultrasonic bath
Mechanical stretching device
HV Test N2 Gas box
Keithley Picoammeter 6487 with 500
V source Ohmmeter
Ultrasonic bath (Elmasonic S900H )
Storage shelves for the GEM foils
and frames etc …
Built originally for the BigBite drift chambers construction
Assembly Steps of the SBS GEM Prototype at UVa
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N2 Box for HV test of GEM Foils
Test of the Spacer FramesPreparing the frames
Resistors been soldered on GEM
Preparation of the readout board
Stretching of GEM foils
Stretching device inspired from Benciveni
(LNF) and Cisbani (Roma) designs
SBS GEM Prototypes at UVa
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UVa Proto I with Panasonic connectors
First prototype built at Rome (E. Cisbani, 2010)
Beam test @ DESY Low intensity electron
beam 2-6 GeV at few KHz trigger rate.
Lost the chamber because of HV manipulation
Two prototypes just built at Uva (2012)
First proto under test since July 2012
Second just completed
UVa Proto II
with ZIF co
nnectors
First S
BS Proto built at
Roma
Preliminary tests on SBS GEM Proto I
K. Gnanvo - WG1 RD51 Coll. Meeting, Stony Brook University, NY
Distribution of the mean ADC count: Gain uniformity
Y-axis (m
m)
X-axis (mm)
Set of strips on one side of the chamber
not connected very noisy channels
Good overall gain uniformity
Good X-Y charge sharing (ratio 1.1)
X/Y (ADC) = 1.12
APV25-SRS Electronics @ UVa
K. Gnanvo - WG1 RD51 Coll. Meeting, Stony Brook University, NY
• Developed by RD51 Collaboration (CERN)
• 16 APV25 cards + 1 set of ADC/FEC board 2046
channels
• Data through Gb Ethernet via UDP using DATE
software developed by ALICE DAQ
• Decoder + basic data analysis with AMORE
Framework provided by ALICE DAQ
X-axis
Y-axis
APV25-MPD Electronics @ UVa
K. Gnanvo - WG1 RD51 Coll. Meeting, Stony Brook University, NY
• Developed for SBS GEM Trackers by Paolo Musico
(INFN Genova) Minimum electronics components (front-end + VME
custom module), ZIF connectors to the GEM (no
soldering on the readout foil) Interconnecting backplane connection between front-
end and VME Standalone DAQ + ROOT based primary analysis
available
X-axis t1
Y-axis t1
X-axis, t1 + 25 ns
Y-axist1 + 25 ns
New design for SBS Back Tracker GEMs
Main changes for the new SBS GEM module design
Larger active area (50 x 50 cm2) and readout board design modified
Larger frame provide better stretching and support of the chamber
Protection resistors outside the chamber (no soldering on the GEM foils)
4 modules needed for the SBS Back Tracker chamber unit (200 x 50 cm2) SBS chamber unit
Significant reduction of the overall dead area of the chamber unit
32 instead of 40 modules needed for the backtrackers at a lower overall cost
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50 c
m50 cm
New design for SBS Back Tracker GEMs
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Final design at CERN (August 2012)
Panasonic connectors for the r/o strips
On flexible Kapton in the vertical axis
Solid support G10 on the horizontal
axis
24 HV sectors on the foil with 2 sets of HV
contacts on each side of the chamber.
Large readout support with fixation holes
Solenoidal Large Intensity Device (SoLID)in Hall A @ JLab
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• General Purpose Deep Inelastic Scattering for Parity Violation
• will be used in different configurations for 12GeV PVDIS and SIDIS experiments
4 GEM layers, 120 GEM modules, Largest GEM module similar size as CMS GEM
• CO2 gas Cerenkov detector: Temple U, Stonybrook
• Heavy Gas Cerenkov: Temple U., Duke
• EM Calorimeters : W&M, UVa, UMass,
LANL,Duke
• GEM detectors: UVa, Miss State, Chinese
Collaboration (CIAE, Huangshan U, PKU, LZU,
Tsinghua, USTC), UKY, Korean Collaboration
(Seoul National U)
• Scintillator: Chinese Collaboration, Duke
• MRPC: Tsinghua Univ., Duke
• Electronics: JLab
• DAQ: Jlab and UMass
• Magnet: JLab and Argonne
• Simulation: Umass, Uva, Syracuse and Duke
Prototyping Large Area GEM for Future Projects
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45 cm
99.5 cm
22 cm
SIDIS PVDIS
Brookhaven R&D funding at UVa for a
large area GEM for EIC Forward Tracker
Common prototype R&D for EIC FT and
SoLID spectrometer at JLab
Chamber size very similar to CMS GEM
Chamber for high Eta Muon detector
SoLID SoLID
4 GEM layers, 120 GEM modules
Largest GEM module 100 cm x
(22-45 cm)
Total area ~ 23 m2
Summary
K. Gnanvo - WG1 RD51 Coll. Meeting, Stony Brook University, NY
GEM detectors to play a big role in Hall A Spectrometers for JLab 12 GeV Two big project: SBS (approved), SoLID (proposal0 Large area GEM no longer an issue
Univ. of Virginia and INFN Roma to build the SBS Tracker GEMs Three prototypes built: one in Roma, two at Univ. of Virginia, Prototypes being currently chartacterized
Upgrade of the SBS Back Trackers GEM design completed Improve the stretching of the GEM foil and facilitate the assembly and handling of the chamber
Design of the SoLID/EIC large prototype is on going. Design inspired by the CMS GEM trapezoidal chamber 2D UV Readout to be produced and tested early next year
APV25 (both SRS and MPD) systems at work in UVa detector Lab More than 5K channels available. Some improvement needed on the MPD decoding and analysis software We need to modify the Italian APV25 FE card and backplanes the new Back Trackers GEM design
GEM Team @ Univ. of Virginia
K. Gnanvo - WG1 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 …
Issues with the chamber efficiency
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Backup
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The GEM Foil Stretcher UVa Stretcher device upgraded from Benciveni
(LNF. Italy) and Cisbani (Roma, Italy)
Improvement Foil is stretched in less than 30 min
7 Load cells with max tension of 23 kg over 13 cm
Various tension test on mock foils at 0.25kg/cm,
0.35kg/cm, 0.75kg/cm
Monitoring displays of the measured tension
T = 0.35 kg/cm
Stretched & framed GEM foil