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

Journal Article · Tue Nov 03 00:00:00 EST 2015 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2015.10.086· OSTI ID:1224959

Zhu, Pengjia  ^[1]; Allada, Kalyan ^[2]; Allison, Trent ^[3]; Badman, Toby ^[4]; Camsonne, Alexandre ^[3]; Chen, Jian-ping ^[3]; Cummings, Melissa ^[5]; Gu, Chao  ^[6]; Huang, Min ^[7]; Liu, Jie ^[6]; Musson, John ^[3]; Slifer, Karl ^[4]; Sulkosky, Vincent ^[8]; Ye, Yunxiu  ^[1]; Zhang, Jixie ^[9]; Zielinski, Ryan ^[4]

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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)

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.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Grant/Contract Number: AC05-84ER40150; 11135002; 11275083; KJ2012B179
• OSTI ID: 1224959
• Alternate ID(s): OSTI ID: 1359625
• Report Number(s): JLAB-PHY-15-2148; DOE/OR/23177-3572; arXiv:1509.03510; PII: S0168900215013200
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 808; ISSN 0168-9002
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
43 PARTICLE ACCELERATORS
G2p
BPM
raster
beam position