ucna specs – jwm 9/4/7 proton beam energy = 800 mev peak proton current = 40 ua duty cycle = 1/10...
Post on 19-Dec-2015
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UCNA specs – JWM 9/4/7• Proton beam energy = 800 MeV• Peak proton current = 40 uA• Duty cycle = 1/10 (1 sec on, 10 sec off)• Therefore time-averaged current is 4 uA.• Source is designed to take 10 uA time-averaged.• Spallation target is tungsten, 2cm diameter, 10 cm long.
• Cooling of spallation target achieved by flowing compressed He gas.
• The length of the red “beta spectrometer” at bottom center of next slide is about 5.5 m long
• Shielding is 9’ of steel and 6’ of concrete.• People can walk around area when beam is on (provided shielding
is all in place)• Remote extraction handled by removing one shield block, then
pulling out a package from custom-made block. (see picture)
Thanks to M. Makela and A. Saunders from LANL for providing the numbers
Layout in Area B800 MeVprotons
UCNSource
beta-spectrometer
polarizermagnet
proton beamdirection
shield package
UCN port
remote extraction
UCNto expt
“prepolarizer” magnet
polarizer magnet
beta-spectrometer magnet
UCN guideinsertion
future UCNguide path
Status