Speaker
Description
We report on experimental studies of a compact 5.7-GHz electron buncher that uses a permanent magnet configuration for beam focusing and efficient bunch formation. The buncher employs two radiofrequency cavities, each followed by an electrostatic potential depression (EPD) section—an insulated beam pipe biased with a negative high voltage—to enable rapid bunching and reduce the overall structure length. Each RF cavity and EPD section is surrounded by a tunable permanent magnet array that provides an on-axis solenoid-like focusing field. The on-axis field strength can be coarsely adjusted by adding or removing magnet blocks and finely tuned using a mechanical iris that moves the magnets radially. An experimental setup has been implemented to measure current modulation and magnetic field strength. The measurements are compared with previous simulations to assess the effectiveness of the EPD-based bunching and the tunable magnetic focusing system.
Footnotes
LA-UR-25-31608
Approved for public release: distribution is unlimited.
Funding Agency
This research was funded by the U.S. Department of Energy through the Laboratory Directed Research and Development program of the Los Alamos National Laboratory, under project number 20240136ER.
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