@article{3539879e61514c13a97255289e3a51ae,
title = "Bremsstrahlung tagged photon beam in Hall B at JLab",
abstract = "We describe the design and commissioning of the photon tagging beamline installed in experimental Hall B at the Thomas Jefferson National Accelerator Facility (JLab). This system can tag photon energies over a range from 20% to 95% of the incident electron energy, and is capable of operation with beam energies up to 6.1 GeV. A single dipole magnet is combined with a hodoscope containing two planar arrays of plastic scintillators to detect energy-degraded electrons from a thin bremsstrahlung radiator. The first layer of 384 partially overlapping small scintillators provides photon energy resolution, while the second layer of 61 larger scintillators provides the timing resolution necessary to form a coincidence with the corresponding nuclear interaction triggered by the tagged photon. The definitions of overlap channels in the first counter plane and of geometric correlation between the two planes are determined using digitized time information from the individual counters. Auxiliary beamline devices are briefly described, and performance results to date under real operating conditions are presented. The entire photon-tagging system has met or exceeded its design goals.",
author = "Sober, {D. I.} and Hall Crannell and Alberto Longhi and Matthews, {S. K.} and O'Brien, {J. T.} and Berman, {B. L.} and Briscoe, {W. J.} and Cole, {Philip L.} and Connelly, {J. P.} and Dodge, {W. R.} and Murphy, {L. Y.} and Philips, {S. A.} and Michael Dugger and D. Lawrence and Barry Ritchie and Smith, {E. S.} and Lambert, {James M.} and E. Anciant and G. Audit and T. Auger and C. Marchand and M. Klusman and J. Napolitano and Khandaker, {M. A.} and Salgado, {C. W.} and Sarty, {A. J.}",
note = "Funding Information: The list of people who could be thanked at the end of a project of more than five years duration becomes all but unmanageable, but the contributions of the following individuals in particular are gratefully acknowledged: Addison Lake, John O'Meara and John Robb of the JLab engineering staff for their invaluable participation in all stages of the design and assembly process; Bernhard Mecking and Arne Freyberger of JLab, and Dave Doughty of Christopher Newport University, for many helpful suggestions and contributions throughout the extended lifetime of this project; Paul Branch of CUA for his machinist skills during the prototyping phase; Irwin Price of GWU for essential financial support to one of us (WJB); Randall Stevens and Aaron Vanderpool of ASU for technical assistance in fabricating and testing tagger electronics; R. DiBari, K. Knowles and R. Thomas of RPI for technical contributions to the Pair Spectrometer; Scott Teige of Indiana U. for providing the lead glass blocks for the TASC, and Pete Hemler of JLab for designing its support structure; Powell Barber of FSU for his expertise in manufacturing the thin radiator targets, and Robin Chappell and the FSU machine shop for fabricating the HARPs; Doug Tilles and the entire JLab Hall B crew of riggers and welders for cheerful and reliable day to day support during installation and calibration; Students Henrik Ayvazian, Zoran Bucalo, Juan Carlos Sanabria, Bryan Carnahan, Catalina Cetina, Katherine Keilty, Aziz Shafi, Michele Schottenbauer, and Michael Wood, and technician Shane Briscoe, for their participation in construction and testing. This project was supported in part by the National Science Foundation (ASU, CUA, FSU, RPI) and by the Department of Energy (GWU, JLab). ",
year = "2000",
month = feb,
day = "1",
doi = "10.1016/S0168-9002(99)00784-6",
language = "English (US)",
volume = "440",
pages = "263--284",
journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",
issn = "0168-9002",
publisher = "Elsevier",
number = "2",
}