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Title: Opportunities and challenges of a low-energy positron source in the LERF

Journal Article · · AIP Conference Proceedings
DOI: https://doi.org/10.1063/1.5040223 · OSTI ID:1467036
 [1];  [1];  [2];  [2]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. North Carolina Central Univ., Durham, NC (United States)
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Though there are many applications of low energy positrons, many experiments are source limited. Using the LERF accelerator at the Thomas Jefferson National Accelerator Facility, it is possible to build a high brightness source of very low-energy positrons. The accelerator requirements are well within the capabilities of the installed hardware. The accelerator can produce 120 kW of beam with a beam energy of up to 170 MeV. For these experiments, we only need run at up to 120 MeV. The gamma-to-positron converter must be able to absorb 20% of the beam power that the linac delivers. At this low an energy the converter, though challenging, is possible. The transport of the low energy positrons from the production target to the next stage, where the energy is reduced even further, must have a very large acceptance to be able to efficiently transport the flux of positrons from the positron production target to the moderator. In this paper, we propose to accomplish such a transport by means of a guiding solenoidal field with a novel endcap design. Finally, in this presentation, we will present the proposed schemes necessary to realize such a high brightness positron source.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Grant/Contract Number:
AC05-06OR23177
OSTI ID:
1467036
Report Number(s):
JLAB-ACP--18-2786; DOE/OR/23177--4514
Journal Information:
AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1970; ISSN 0094-243X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (9)

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Brightness enhancement of slow positron beams journal October 1980
Intense positron source at the Munich research reactor FRM-II journal December 2002
A positron annihilation lifetime measurement system with an intense positron microbeam journal December 2009
Accumulator for the production of intense positron pulses journal July 2006
Radiation control aspects of the civil construction for a high power free electron laser (FEL) facility conference January 1997
The Jefferson Lab Free Electron Laser Program journal May 2011
Production of Highly Polarized Positrons Using Polarized Electrons at MeV Energies journal May 2016
Heat Deposition in Positron Sources for ILC conference January 2005

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS