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Title: The Heavy Photon Search beamline and its performance

The Heavy Photon Search (HPS) is an experiment to search for a hidden sector photon, aka a heavy photon or dark photon, in fixed target electroproduction at the Thomas Jefferson National Accelerator Facility (JLab). The HPS experiment searches for the e$^+$e$^-$ decay of the heavy photon with bump hunt and detached vertex strategies using a compact, large acceptance forward spectrometer, consisting of a silicon microstrip detector (SVT) for tracking and vertexing, and a PbWO$$_4$$ electromagnetic calorimeter for energy measurement and fast triggering. To achieve large acceptance and good vertexing resolution, the first layer of silicon detectors is placed just 10 cm downstream of the target with the sensor edges only 500 $$\mu$$m above and below the beam. Placing the SVT in such close proximity to the beam puts stringent requirements on the beam profile and beam position stability. As part of an approved engineering run, HPS took data in 2015 and 2016 at 1.05 GeV and 2.3 GeV beam energies, respectively. This study describes the beam line and its performance during that data taking.
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Publication Date:
Report Number(s):
JLAB-PHY-17-2393; DOE/OR/23177-4040; arXiv:1612.07821
Journal ID: ISSN 0168-9002; PII: S0168900217304175; TRN: US1700554
Grant/Contract Number:
AC05-06OR23177; AC02-76SF00515
Published Article
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 859; Journal Issue: C; Journal ID: ISSN 0168-9002
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
43 PARTICLE ACCELERATORS; electron beam; collimator; Heavy photon; silicon microstrips; electromagnetic calorimeter
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1350032