Update on GEM Activities for the 12 GeV Program in Hall A at JLab

Kondo GNANVOUniversity 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)


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


Large luminosityModerate acceptanceForward angles Reconfigurable detectors

GEP5 setup• 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


Choice of the GEM Technology



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 side 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 Panasonic c

onnectors @

UVa

Design done by E. Cisbani (INFN Roma, Italy)

Our Class 1000 Clean Room (3.5 × 3 m2 )


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


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


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 connect

ors

First SBS Proto built a

t Roma

Preliminary tests on SBS GEM Proto I


Distribution of the mean ADC count: Gain uniformity

Y-axis (mm

)

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


• 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


• 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


50 c

m50 cm

New design for SBS Back Tracker GEMs


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


• 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


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


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


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


Backup



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

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Update on GEM Activities for the 12 GeV Program in Hall A at JLab

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