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This is a 4 stage depressed collector designed for the original UCSB FEL. It has been modified by removal of its 40 KV decelerator
section to increase energy spread acceptance to 50 KV.
Trajectories representing a 10 KV energy spread filling the useful entrance aperture (worst case).
Collection potentials are 50 KV, 35 KV, 17.5 KV, 0 KV. This collector is currently installed in the
6 MV accelerator.
Collector Type 2
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This is a 5 stage depressed collector. It was originally designed for a pulsed 20 A beam with 200 KV energy spread.
It is currently installed in the 2 MV, CW, MM-Wave FEL and will be further modified with the addition
of liquid cooling for a 2 A, DC beam with 30 KV energy spread.
Trajectories representing a 30 KV energy spread filling the usefull entrance aperture (worst case).
Collection potentials are 50 KV, 30 KV, 20 KV, 10 KV, 0 KV.