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GEM Detectors for DarkLight Phase I

Graduate #89
Discipline: Physics
Subcategory: Physics (not Nanoscience)

Sahara Jesmin Mohammed Prem Nazeer - Hampton University


The DarkLight experiment has been proposed to search for a heavy photon A’ in the mass range of 10-100 MeV/c^2 produced in electron scattering. Phase 1A of DarkLight has started to take place in 2016 at the Low Energy Recirculator Facility (LERF) at Jefferson Lab. LERF delivered a 100 MeV electron beam onto a windowless hydrogen gas target. The Phase-Ia detector tracks leptons inside the DarkLight solenoid with a set of Gas Electron Multiplier (GEM) detectors, combined with segmented scintillators for triggering. The GEM telescope consists of four 10×10 cm^2 triple layer GEM chambers with 2D readout strips, mounted in a slightly angled fixed frame about 12 cm tall.
For Phase 1C a setup of two magnetic spectrometers is designed for a targeted search for a dark photon in the mass region near 17 MeV/c^2 where a signal was recently reported by a Hungarian group, interpreted as a fifth force particle. The group is developing customized GEM detectors to instrument the Phase-1C setup with a tracking detector system for the electron positron pair originating from the decay of the A’.
The performance of the 10×10 GEM telescope will be discussed, with a status update of the preparation of the Phase 1C detector.

Abstract-ERN.docx

Funder Acknowledgement(s): This work is supported by NSF grants PHY-1505934 and PHY-1436680.

Faculty Advisor: Michael Kohl, kohlm@jlab.org

Role: The re-assembling of GEM detectors for the DarkLight experiment, testing, installing and data analysis for the phase 1A. Designing of the phase 1C detector will be done.

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This material is based upon work supported by the National Science Foundation (NSF) under Grant No. DUE-1930047. Any opinions, findings, interpretations, conclusions or recommendations expressed in this material are those of its authors and do not represent the views of the AAAS Board of Directors, the Council of AAAS, AAAS’ membership or the National Science Foundation.

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