GEM Trackers for Super BigBite Spectrometer (SBS) in Hall A @ JLabThe Super Big Bite Spectrometer (SBS) is one of the major new equipment in hall A in preparation for the 12 GeV upgrade of the CEBAF accelerator at JLab. GEM detectors technology has been adopted for the tracking system of the aparatus.

The GEM chambers are arranged into three trackers: The first is the Front Tracker (FT) consisting of six large area (40 × 150 cm2) GEM layers. Each FT layer is a vertical stack of three 40 × 50 cm2 GEM modules design and built in Italy by

INFN Roma & INFN Catania. The second and third trackers are part of the Back Tracker Polarimeter (BTP). Each of them consists of four GEM layers with an active area of 50 × 200 cm 2 assembled with four GEM modules (40 × 50 cm2).

University Of Virginia (UVa) is in charge of the GEMs for Back Tracker Polarimeter. Several prototypes of the FT and BTP GEM modules have been successfully built (see below) and are been tested.

SRS is a flexible approach that provides a choice of ASICs, hybrids or discrete frontends, with either analog, binary or digital readout, connected over a

customizable interface to a DAQ system. Our group is upgrading its APV25-based small SRS (2K channels) to a larger system with more than 10 K

channels and the additional SRU for the data transfer and event builder. We are also working on the integration of the SRS into CODA, Hall A data

acquisition Software at JLab. The full SRS will be tested on our large GEM chambers during the test beam at Fermilab in October 2013.

120 cm

100 cm22 cm

44 cm

6°

Our UVa group is also participating to the ongoing R&D for the tracking

and PID detectors for the future Electron Ion Collider. We are currently

building a large GEM with 2D stereo angle readout for pre-R&D

prototype for both the EIC Forward Tracking and the SoLID Tracking

detectors. The prototype is going to be assembled in September 2013 for

the scheduled test beam at Fermilab Test Beam Facility (TFBF) in

October 2013.

Toward Very Large Area GEM Detectors

APV25 Electronics for Experiments in Hall A at JLab

R&D for large area GEM at UVa for current and future experiments at Jlab

Kondo GNANVOUniversity of Virginia, Department of Physics, Charlottesville, VA 22901, USA

Front Tracker L

ayer (INFN

Rom

e, Italy)

Back T

racker GE

M L

ayer (U. of V

irginia, US

A)

Back Tracker 50 × 50 cm2 GEM

Courtesy K. Allada, JLab

Courtesy E

. Cisba

ni, INF

N R

oma, Italy

Courtesy P. Musico, INFN Genoa, Italy

Front Track prototype

Preliminary results with Cosmic @ UVa

XADC / YADC = 1.3

Charge sharing X/Y stripsAverage ADC counts

The 2 × 0.5 m2 Triple GEM prototype will represent a major leap

especially for Jefferson Lab compared to existing wire chambers

used for tracking. New idea for a 2D COMPASS-like readout will be

explored with excellent spatial resolution at high rates with low

capacitance noise. Below is a design sketch of the prototype

R & D for Large Area 200 × 50 cm2 GEM with 2D readout

SoLID / EIC GEM prototype [Trapezoid: 100 × (44 – 22) cm2 ]The Solenoidal Large Intensity Device (SoLID) apparatus for the 12 GeV Program in Hall A @ JLab

Readout board

2D stereo angle (12°) U/V readout (r/o) board

Pitch = 550 mm, top strips = 140 mm, bottom = 490 mm

connectors only on the top and bottom part of the r/o board

The Multi-Purpose Digitizer –MPD (INFN Genoa, Italy)The Scalable Readout System – SRS (RD51, CERN)The MPD system consists on frontend cards hosting the APV25s and a VME64x modules with VXS optional extension for JLab DAQ environment. The

MPD module is able to control and read out up to 16 front end cards. The connection between the front-end and the readout is made using either high

density flat cables (for small systems) or a custom backplane (for complex systems). The signals are carried to the MPD using standard HDMI cables. The

MPD DAQ control signal is compliant with Jlab CODA system

The MPD electronics system has been adopted by

the OLYMPUS collaboration to readout the 3072

channels of its six 10 × 10 cm2 GEM chambers

with two MPDs operating with standard VME32

5-slots back plane and APV25-FE card with Panasonic Connector compatible with the Back Tracker GEM

Top side

Bottom side

Pedestal rms noise distribution

Effect of the strips capacitances

SIDIS

PVDIS

Configuration of the

GEMs two majors

SoLID experiments

(PVDIS and SIDIS)