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Title: Positron Production Target

Abstract

A positron production target design is required to convert 100 kW or more of electron beam average power to produce positrons with good beam quality and possibly high polarization. Conventional high power positron targets usually rely on mechanically rotating the target to distribute the heat load. Mechanical complications for a rotating target include limited cooling water flow, vibration, eddy currents, and wear of the vacuum rotary bearing. A novel approach was proposed to use beam dynamics manipulation based on a pair of rotating magnetic field to deflect the high-power electron beam along a line or around a circle on a fixed target window, and then to combine the produced positrons back into a beam. Proper beam optics design will distribute and dilute the heat load evenly, thus avoiding destructive focusing on a single spot, while achieving copious positron beam production. The fixed target assembly allows sufficiently high cooling water flow to circulate on the target perimeter to carry away deposited heat. During Phase I, a prototype positron target was designed and simulations were carried out to study electron and positron beam transport, positron production on target, positron collection and polarization control, collimation and momentum selection, and positron detection, using severalmore » software packages including G4Beamline. This novel positron source design may lead to advances in positron beam acceleration and future nuclear physics applications, detector calibration for neutrino experimental systems, and other advanced techniques for nuclear physics experiments.« less

Authors:
; ;
Publication Date:
Research Org.:
Omega-P R&D, Inc.
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1502115
Report Number(s):
DE-SC0018507
DOE Contract Number:  
SC0018507
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
Positron, High Power Target, Beam Dynamics, Nuclear Physics

Citation Formats

Shchelkunov, Sergey V., Hirshfield, Jay L., and Jiang, Yong. Positron Production Target. United States: N. p., 2019. Web. doi:10.2172/1502115.
Shchelkunov, Sergey V., Hirshfield, Jay L., & Jiang, Yong. Positron Production Target. United States. doi:10.2172/1502115.
Shchelkunov, Sergey V., Hirshfield, Jay L., and Jiang, Yong. Tue . "Positron Production Target". United States. doi:10.2172/1502115. https://www.osti.gov/servlets/purl/1502115.
@article{osti_1502115,
title = {Positron Production Target},
author = {Shchelkunov, Sergey V. and Hirshfield, Jay L. and Jiang, Yong},
abstractNote = {A positron production target design is required to convert 100 kW or more of electron beam average power to produce positrons with good beam quality and possibly high polarization. Conventional high power positron targets usually rely on mechanically rotating the target to distribute the heat load. Mechanical complications for a rotating target include limited cooling water flow, vibration, eddy currents, and wear of the vacuum rotary bearing. A novel approach was proposed to use beam dynamics manipulation based on a pair of rotating magnetic field to deflect the high-power electron beam along a line or around a circle on a fixed target window, and then to combine the produced positrons back into a beam. Proper beam optics design will distribute and dilute the heat load evenly, thus avoiding destructive focusing on a single spot, while achieving copious positron beam production. The fixed target assembly allows sufficiently high cooling water flow to circulate on the target perimeter to carry away deposited heat. During Phase I, a prototype positron target was designed and simulations were carried out to study electron and positron beam transport, positron production on target, positron collection and polarization control, collimation and momentum selection, and positron detection, using several software packages including G4Beamline. This novel positron source design may lead to advances in positron beam acceleration and future nuclear physics applications, detector calibration for neutrino experimental systems, and other advanced techniques for nuclear physics experiments.},
doi = {10.2172/1502115},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {1}
}