Large Size GEM for Super Bigbite Spectrometer (SBS) Polarimeter for Hall A 12 GeV program at JLab

Abstract

We report on the R&D effort in the design and construction of a large size Gas Electron Multiplier (GEM) for the Proton Polarimeter Back Tracker (BT) of the Super Bigbite Spectrometer (SBS) in Hall A at Thomas Jefferson National Laboratory (JLab). The SBS BT GEM trackers consist of two sets of five large GEM xchambers of size 60 x 200 cm2. The GEM chamber is a vertical stack of four GEM modules, each with an active area of 60 x 50 cm2. We have built and tested several prototypes and the construction of GEM modules for SBS BT is ongoing. We describe in this paper the design and construction of the GEM module prototype as well as the preliminary results on performance from tests carried out in our detector lab and during test beam at Fermi National Laboratory (Fermilab).

17 pages, 14 Figures

References in corpus (1)

• Examining the Geometric Mean Method for the Extraction of Spatial Resolution

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• Measurements of the Charging-Up Effect in Gas Electron Multipliers
• Performance in Test Beam of a Large-area and Light-weight GEM detector with 2D Stereo-Angle (U-V) Strip Readout
• Research and Development of Commercially Manufactured Large GEM Foils
• A Study of a Mini-drift GEM Tracking Detector
• Polarization transfer in ${\vec{e}}^{+}p\to e^{+}\vec{p}$ scattering using the Super BigBite Spectrometer
• Performance of a triple-GEM detector with capacitive-sharing 3-coordinate (X-Y-U)-strip anode readout
• Accuracy of the geometric-mean method for determining spatial resolutions of tracking detectors in the presence of multiple Coulomb scattering
• A fast spatial resolution optimizing method for track-ion using a GEM detector based on the time information