High Current Results from the 2X Scaled Penning Source
- Dr. Dan FAIRCLOTH
- Dr. Dan FAIRCLOTH (STFC Rutherford Appleton Laboratory)
To meet the full 2 ms 50 Hz 60 mA beam requirements for the Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL), a new cesiated Penning Surface Plasma Source (SPS) has been developed with a larger plasma volume with 2X the linear dimensions of the standard ISIS source .
A clean 75 mA H– beam has been measured from the 2X Scaled Source on the VESPA test stand at full 2 ms 50 Hz duty cycle. At lower 800 µs duty cycles H– beam currents of 150 mA have been measured at high discharge currents. Two different extraction geometries are studied. Emittance scans and perveance sweeps are shown.
 “2X Scaled Penning Source Developments”, D. C. Faircloth, S. R. Lawrie, J. Sherman, P. Wise, M. O. Whitehead T. Wood and T. Sarmento, Proceedings of ICIS2017, Geneva, 2017.