Results of the first implementation of RF phase signature matching at LANSCE

Huang, En -Chuan; Taylor, Charles Edward; Roy, Prabir Kumar; Upadhyay, Janardan

doi:10.1088/1748-0221/17/02/t02007

Title: Results of the first implementation of RF phase signature matching at LANSCE

Journal Article · 27 February 2022 · Journal of Instrumentation

DOI: https://doi.org/10.1088/1748-0221/17/02/t02007 · OSTI ID:1868301

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The LINAC at the Los Alamos Neutron Science Center (LANSCE) has been utilizing the Delta-t method to match the RF cavities to the design acceleration parameters since its commissioning in 1972. The differences in time-of-flight between two subsequent Beam Position and Phase Monitors (BPPMs) are measured with both accelerated and drifting beams, depending on the whether the module is set to on or off. The algorithm optimizes the module amplitude and phase via iterative measurements if the initial phase is in the vicinity of the design value. With an upgrade to a faster readout system, a scan over the whole RF cavity phase range requires relatively less time than the classical optimization procedure. The Phase Scan Signature Matching (PSSM) method provides a time-efficient method that ensures the phase selection lands on the bunching side and empowers future analyses to build module-specific models. The PSSM also utilizes a direct model to determine the correct amplitude to sub-percent level instead of using linearized matrices. Furthermore, lacking a reliable energy measurement method in the LINAC, we measure the beam phases at two downstream locations to increase the precision of energy measurements. In this letter, we also discuss the sensitivities of PSSM, error propagation, and the implementation results for the 2019 and 2020 beam cycles.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396

OSTI ID:: 1868301

Report Number(s):: LA-UR-21-30725

Journal Information:: Journal of Instrumentation, Journal Name: Journal of Instrumentation Journal Issue: 02 Vol. 17; ISSN 1748-0221

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Results of the first implementation of RF phase signature matching at LANSCE

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