High-intensity positron microprobe at the Thomas Jefferson National Accelerator Facility

We present a conceptual design for a novel continuous wave electron-linac based high-intensity high-brightness slow-positron production source with a projected intensity on the order of 1010 e+/s. Reaching this intensity in our design relies on the transport of positrons (T+ below 600 keV) from the...

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Bibliographic Details
Published in:Journal of applied physics 2014-06, Vol.115 (23)
Main Authors: Golge, S., Vlahovic, B., Wojtsekhowski, B.
Format: Article
Language:English
Subjects:
BRIGHTNESS
CEBAF ACCELERATOR
Computing time
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Continuous radiation
Converters
DESIGN
Design optimization
EFFICIENCY
ELECTRONS
EXTRACTION
KEV RANGE 100-1000
MAGNETIC FIELDS
MONTE CARLO METHOD
OPTIMIZATION
PAIR PRODUCTION
POSITRON BEAMS
POSITRONS
RADIATION PROTECTION
Rare gases
SOLIDS
Target thickness
THICKNESS
Transport
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Summary:We present a conceptual design for a novel continuous wave electron-linac based high-intensity high-brightness slow-positron production source with a projected intensity on the order of 1010 e+/s. Reaching this intensity in our design relies on the transport of positrons (T+ below 600 keV) from the electron-positron pair production converter target to a low-radiation and low-temperature area for moderation in a high-efficiency cryogenic rare gas moderator, solid Ne. This design progressed through Monte Carlo optimizations of: electron/positron beam energies and converter target thickness, transport of the e+ beam from the converter to the moderator, extraction of the e+ beam from the magnetic channel, a synchronized raster system, and moderator efficiency calculations. For the extraction of e+ from the magnetic channel, a magnetic field terminator plug prototype has been built and experimental results on the effectiveness of the prototype are presented. The dissipation of the heat away from the converter target and radiation protection measures are also discussed.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4884781