Compton scattering off the nucleon is one of the simplest processes that can provide valuable information for the understanding of the nucleon structure. A Wide Angle Compton Scattering experiment requires a high intensity photon source based on the CEBAF electron beam, that can safely operate in Hall A at JLab. One of the hardware tasks for a team proposing an experiment is to consolidate the design of the photon source, simulate its performance, and then build it. The solution illustrated here is an untagged bremsstrahlung γ source consisting of a 10% radiation length radiator and a normal conducting magnet to sweep incident beam electrons out of the beam line, with proper shielding inside and around the magnet, making it a sort of mini beam dump. The magnet bore has a tungsten-copper block with a set of small openings (2 mm by 20 mm), designed to be 1 m long. It will slowly move along a vertical axis to perform as a "mechanical raster", to protect the polarized target from local overheating.

A Compact Photon Source for the WACS Experiment At JLab

TORTORICI, Francesco;BELLINI, Vincenzo;MAMMOLITI, FRANCESCO;SUTERA, CONCETTA MARIA;
2016

Abstract

Compton scattering off the nucleon is one of the simplest processes that can provide valuable information for the understanding of the nucleon structure. A Wide Angle Compton Scattering experiment requires a high intensity photon source based on the CEBAF electron beam, that can safely operate in Hall A at JLab. One of the hardware tasks for a team proposing an experiment is to consolidate the design of the photon source, simulate its performance, and then build it. The solution illustrated here is an untagged bremsstrahlung γ source consisting of a 10% radiation length radiator and a normal conducting magnet to sweep incident beam electrons out of the beam line, with proper shielding inside and around the magnet, making it a sort of mini beam dump. The magnet bore has a tungsten-copper block with a set of small openings (2 mm by 20 mm), designed to be 1 m long. It will slowly move along a vertical axis to perform as a "mechanical raster", to protect the polarized target from local overheating.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/306528
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