The Heavy Photon Search beamline and its performance

N. Baltzell, H. Egiyan, M. Ehrhart, C. Field, A. Freyberger, F. X. Girod, M. Holtrop, J. Jaros, G. Kalicy, T. Maruyama*, B. McKinnon, K. Moffeit, T. Nelson, A. Odian, M. Oriunno, R. Paremuzyan, S. Stepanyan, M. Tiefenback, S. Uemura, M. UngaroH. Vance

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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 PbWO4 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 μm 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 paper describes the beam line and its performance during that data taking.

Original languageEnglish
Pages (from-to)69-75
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - 1 Jul 2017
Externally publishedYes


  • Collimator
  • Electromagnetic calorimeter
  • Electron beam
  • Heavy photon
  • Silicon microstrips


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