Polarized electron SRF gun

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Polarized electron SRF gun
ILC requires a flat beam with a horizontal
normalized emittance of 8 µ and a vertical
emittance of 0.02 µ with a bunch charge of 3.2
nC at the output of the damping ring. This is
equivalent to
In simulations we achieve a 4D emittance of 0.75
µ at the entrance of the converter. This is less
that a factor of 2 from the requirement, and
there is room for improvement.
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BNL all niobium gun and ongoing developments

• ½ cell, 1.3 GHz.
• Test bed for photocathode RD

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Test Setup for Polarized Gun
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Cathode Insertion String
8 ft
Pumping required
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Cathode Processing Chamber
NEG Coating of Process Chamber
Adapter with pumping goes there
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Ampere-class SRF gunBNL / AES
½ cell (1.5 cell future), 703.75 MHz, 1 MW, 2
MeV, 500 mA. Suitable for polarized electrons at
ILC current.