Difference between revisions of "Colloquium 8Apr2013"

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'''A POSITRON PRODUCTION EFFICIENCY MEASUREMENT USING THE IAC’S HIGH REPETITION RATE LINAC
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'''A Positron Production Efficiency Measurement using the IAC’S High Repetition Rate LINAC
 
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=Abstract=
 
=Abstract=
Th positron production efficiency was measured for a positron source that uses a quadrupole triplet system to collect positrons from a tungsten target that are produced when the target is impinged by electrons from the High Repetition Rate Linac (HRRL) at Idaho State University's (ISU) Idaho Accelerator Center (IAC). When a 12 MeV electron beam is used on the tungsten target, positrons escaping from the downstream side of the tungsten with a wide momentum and angular spread. The positrons with energies of 1 to 5 MeV observed experimentally after a 90 degree bend using NaI detectors to detect 511 keV photons from annihilation process. In this talk, the speaker will talk about the experimental setup, procedure and results.
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The positron production efficiency of a Linac based positron source that uses on a quadrupole triplet system to collect positrons was measured.  Positrons are produced when a 2mm thick tungsten target is impinged by 12 MeV electrons from the High Repetition Rate Linac (HRRL) at Idaho State University's (ISU) Idaho Accelerator Center (IAC). Producing a positron beam in this manner is challenging due to the wide momentum and angular spread of the positrons leaving the downstream side of the tungsten target. Positrons with energies between one to five MeV were observed experimentally after the beam line's 90 degree bend. Positrons that annihilated on a second tungsten target, located at the end of the 90 degree beamline,  produced  511 keV photons that were observed using NaI detectors. In this talk, the speaker will present the theory of the positron production as well as the experimental setup, procedure, and measured positron production efficiency.

Latest revision as of 20:56, 2 April 2013

Title

A Positron Production Efficiency Measurement using the IAC’S High Repetition Rate LINAC

Abstract

The positron production efficiency of a Linac based positron source that uses on a quadrupole triplet system to collect positrons was measured. Positrons are produced when a 2mm thick tungsten target is impinged by 12 MeV electrons from the High Repetition Rate Linac (HRRL) at Idaho State University's (ISU) Idaho Accelerator Center (IAC). Producing a positron beam in this manner is challenging due to the wide momentum and angular spread of the positrons leaving the downstream side of the tungsten target. Positrons with energies between one to five MeV were observed experimentally after the beam line's 90 degree bend. Positrons that annihilated on a second tungsten target, located at the end of the 90 degree beamline, produced 511 keV photons that were observed using NaI detectors. In this talk, the speaker will present the theory of the positron production as well as the experimental setup, procedure, and measured positron production efficiency.