What is it about?
The observed fluctuation of the beam current is larger at the beam edge. The spatial distribution of the beam component can be explained by two negative hydrogen ion production mechanisms: surface and volume processes.
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Why is it important?
The beam fluctuation or oscillation is transported to down stream RFQ and LINAC. The observation of the beam intensity modulation at the source driving frequency was confirmed.
Perspectives
Some additional study on the beam oscillation coupled to the wave excited due to the magnetic field near the extraction hole is necessary to choose the proper frequency to excite plasma in the negative ion source.
Motoi Wada
Gakko Hojin Doshisha
Read the Original
This page is a summary of: Measurement of a time dependent spatial beam profile of an RF-driven H− ion source, Review of Scientific Instruments, January 2020, American Institute of Physics,
DOI: 10.1063/1.5128015.
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