The Heavy Photon Search beamline and its performance

• DOI: 10.1016/j.nima.2017.03.061
• Publication Date: 2017-04-04T02:57:04Z
• Authors: 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. Ungaro; H. Vance
• Keywords: Electron beam; Electromagnetic calormeter; Physics - Instrumentation and Detectors; FOS: Physical sciences; 535; Instrumentation and Detectors (physics.ins-det); 7. Clean energy; High Energy Physics - Experiment; Elementary Particles and Fields and String Theory; High Energy Physics - Experiment (hep-ex); 03 medical and health sciences; 0302 clinical medicine; Collimator; Silicon microstrips; Nuclear; Heavy photon; Nuclear Experiment (nucl-ex); Nuclear Experiment

The Heavy Photon Search (HPS) is an experiment to search for a hidden sector photon, aka heavy photon or dark in fixed target electroproduction at the Thomas Jefferson National Accelerator Facility (JLab).The HPS searches e + -decay of with bump hunt and detached vertex strategies using compact, large acceptance forward spectrometer, consisting silicon microstrip detector tracking vertexing, PbWO 4 electromagnetic calorimeter energy measurement fast triggering.To achieve good vertexing resolution, first layer detectors placed just 10 cm downstream sensor edges only 500 µm above below beam.Placing SVT such close proximity beam puts stringent requirements on profile position stability.As part approved engineering run, took data 2015 2016 1.05 GeV 2.3 energies, respectively.This paper describes line its performance during that taking.