A new pulsed cryogenic proton source cooled by liquid helium

Takahashi, T.; Horioka, K.; Yoneda, H.; Kasuya, K.
February 1985
Applied Physics Letters;2/1/1985, Vol. 46 Issue 3, p249
Academic Journal
A new cryogenic proton source with liquid helium cooling system is presented. The anode is cooled down to about 4.2 K. A hydrogen ice is produced on the surface and used as the ion source. Proton beams of a current density 21 A/cm² at 200 kV are extracted with good reproducibility. This new ion source is expected to be a proton source without contamination by nonprotonic ions.


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