SR Cavity Test Stand




The ALS Storage Ring cavity test stand is a multi purpose facility for the conditioning of new and replacement high power components, such as the high power windows for the three  ALS cavities. The cavity also serves as a spare unit for the three ALS cavities in service. Conditioning and pre
testing of cavities and windows for UHV operation is very important prior to their installation into the machine. The cavity also serves as a test unit to study HOM damping, coupling issues and other components required by ALS operation otherwise such tests could only  be  carried out during actual machine operation that would interfere with   user  operation  and physics study time. The photographs  shown on this page provide an over all  picture  of the  test   stand  which is a fully  functional 60kW, 500MHz klystron amplifier with a complete wave guide feed system for powering up   the  cavity  to  60kW.  It  is  also  an    essential   integral  part  of  the window coating process for the ALS storage ring RF windows.

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Test Stand equipment rack


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Cavity, wave guide system and transmitter


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Top of transmitter showing output port coupling


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Rear panel of X'mitter


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Cavity and wave guide feed section


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Bifurcating wave guide section for input coupling adjustment


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Cavity situated in lead lined shell

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One half of aluminum covered lead shell

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Test cavity cooling system

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Cooling pumps and heat exchanger for the
cooling system

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