Speaker
Description
We present results from testing a high-temperature superconducting (HTS) magnet prototype for proton therapy. This magnet is specifically designed for a novel rotating gantry capable of delivering the entire proton beam energy range (70–225 MeV) while maintaining a fixed magnetic field in the superconducting magnets. The gantry's innovative layout simplifies the magnet design by enabling the use of straight, flat racetrack DI-BSCCO Bi-2223 coil technology and operation at higher temperatures (~10–15 K).
The magnet has a non-linear field distribution for bending and focusing the proton beams. To validate this feature, we developed a system for measuring the magnetic field distribution in the magnet aperture. We present the design of this hall probe array and experimental results from two different magnet tests at 4.2 K in a liquid helium bath. These results are compared with expected results from simulation of the field distribution and discussed in the context of required field quality for the application.
This work was supported by the Director, Office of Science, Accelerator R&D and Production, and U.S. Department of Energy under contract No. DE-AC02-05CH11231.
