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Title: Beam position reconstruction for the g2p experiment in Hall A at Jefferson Lab

Beam-line equipment was upgraded for experiment E08-027 (g2p) in Hall A at Jefferson Lab. Two beam position monitors (BPMs) were necessary to measure the beam position and angle at the target. A new BPM receiver was designed and built to handle the low beam currents (50-100 nA) used for this experiment. Two new super-harps were installed for calibrating the BPMs. In addition to the existing fast raster system, a slow raster system was installed. We found that before and during the experiment, these new devices were tested and debugged, and their performance was also evaluated. In order to achieve the required accuracy (1-2 mm in position and 1-2 mrad in angle at the target location), the data of the BPMs and harps were carefully analyzed, as well as reconstructing the beam position and angle event by event at the target location. Finally, the calculated beam position will be used in the data analysis to accurately determine the kinematics for each event.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [3] ;  [5] ;  [6] ;  [7] ;  [6] ;  [3] ;  [4] ;  [8] ;  [1] ;  [9] ;  [4]
  1. Univ. of Science and Technology of China, Hefei (China)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. Univ. of New Hampshire, Durham, NH (United States)
  5. College of William and Mary, Williamsburg, VA (United States)
  6. Univ. of Virginia, Charlottesville, VA (United States)
  7. Duke Univ., Durham, NC (United States)
  8. Univ. of Virginia, Charlottesville, VA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  9. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. of Virginia, Charlottesville, VA (United States)
Publication Date:
OSTI Identifier:
1224959
Report Number(s):
JLAB-PHY--15-2148; DOE/OR/23177--3572; arXiv:1509.03510
Journal ID: ISSN 0168-9002; PII: S0168900215013200
Grant/Contract Number:
AC05-84ER40150; 11135002; 11275083; KJ2012B179
Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 808; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 43 PARTICLE ACCELERATORS G2p; BPM; raster; beam position