Magnetic-Field Diffusion Effects in Beam Position Monitors II: Application to Calibration Single-Pulse Data

Technical Report · Wed Jul 27 04:00:00 EDT 2022

DOI:https://doi.org/10.2172/1879336· OSTI ID:1879336

Broste, William B. ^[1]; Ekdahl, Jr., Carl August ^[1]; Johnson, Jeffrey B. ^[1]

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

Beam position monitors (BPMs) provide time-resolved measurements of the current and centroid position of high-current electron beams in linear induction accelerators (LIAs). One of the types of detectors used in BPMs is the B-dot loop, which generates a signal from the EMF due to the time varying magnetic flux through the loop. If some of the boundaries of the loop are composed of thick metal walls with finite conductivity, the resulting signal must be corrected for the magnetic field diffusion into the metal. From first principles, we have derived the perturbation to BPM measurements due to this effect. The theoretical framework was used to design an algorithm for signal correction that does not require knowledge of the time history of the magnetic flux being measured. Corrected signals based on that process compared favorably with the know reference signals in a laboratory calibration test sequence.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: 89233218CNA000001
• OSTI ID: 1879336
• Report Number(s): LA-UR-22-27535
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
47 OTHER INSTRUMENTATION
Linear induction accelerators
beam position monitors
current measurements
electron-beam diagnostics
magnetic diffusion