Speaker
Description
An X-ray detector is being developed for diagnostic measurement and monitoring of the Drift Tube LINAC (DTL) at the Los Alamos Neutron Science Center (LANSCE) at Los Alamos National Lab. The detector will consist of a row of x-ray spectrometers along the DTL which will measure the spectrum of X-rays resulting from bremsstrahlung of field emission electrons (FEE) and spilled beam. Each spectrometer will monitor a specific gap between drift tubes, and the broad array of detectors is intended to allow for location of beam spill and arcs in the DTL, a concept demonstrated to be feasible in previous measurements at the DTL. Two prototypes are under development: one with a LaBr scintillator coupled to a photomultiplier tube (PMT) along with a second LYSO scintillator that is also coupled to a PMT; and a prototype with two LYSO crystals each coupled to a silicon photomultiplier (SiPM). In both prototypes, LYSO provides a tagged gamma source with three peaks that are used for self-calibration. The LaBr-PMT module has better energy resolution than the LYSO-SiPM module, but is more expensive and more difficult to shield from background radiation. Both prototypes were tested at the LANSCE DTL to validate the feasibility of measuring gamma spectra, performing in situ self-calibration, and detecting spilled beam relative to nominal operating conditions in situ. Results from these tests and plans for future development and other possible applications will be presented.
Footnotes
Speaker is Patrick Freeman
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