Open AccessHigh current results from the 2X scaled Penning source
Author(s) -
Dan Faircloth,
Scott Lawrie,
O. Tarvainen,
Tiago Sarmento,
Mark Whitehead,
John S. MacGregor,
R. Abel,
T. Wood
Publication year - 2018
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.177
H-Index - 75
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.5083758
Subject(s) - duty cycle , thermal emittance , nuclear engineering , materials science , beam emittance , perveance , ion source , beam (structure) , coolant , current (fluid) , volume (thermodynamics) , plasma , cyclotron , voltage , electrical engineering , mechanical engineering , optics , physics , nuclear physics , engineering , cathode ray , quantum mechanics , electron
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 caesiated Penning Surface Plasma Source (SPS) has been developed [1] with a larger plasma volume with 2X the linear dimensions of the standard ISIS source. This paper outlines the design decisions made during the development process and details the 2X source construction. Improved electrode cooling is required to operate at higher duty cycles, this is achieved by changing coolant, adding parallel cooling channels, improving mechanical tolerances, decreasing surface roughness and adding thermal interface gaskets. To operate at higher duty factors the ancillary hardware also required significant upgrading.A clean 75 mA H− beam has been measured from the 2X Scaled Source on a 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. Emittance scans and a perveance sweep are shown.
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