Magnetic-Field Diffusion Effects in Beam Position Monitors III: Application to DARHT-II Beam Data

Technical Report · Tue Apr 04 04:00:00 EDT 2023

DOI:https://doi.org/10.2172/1969200· OSTI ID:1969200

Broste, William B. ^[1]; Ekdahl Jr., Carl August ^[1]; Johnson, Jeffrey B. ^[1]; Schulze, Martin E. ^[1]; Abdallah, Kimberly Lynn ^[1]

---

1. Los Alamos National Laboratory (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. The theoretically predicted flux due to diffusion is in remarkable agreement with experimental measurements. Although accurate BPM measurements of beam current require correction of magnetic field diffusion, accurate measurement of beam position requires no correction. In this note, we present experimental validation of current and position results from a prototype detector employing finite conductivity sensing areas, based on experiments on the DARHT-II LIA.

• 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: 1969200
• Report Number(s): LA-UR--23-23481
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
beam centroid position measurements
beam position monitors
electron-beam diagnostics
linear induction accelerators
magnetic diffusion