Design and fabrication of the BNL radio frequency quadrupole

The polarized H(+) injection program for the AGS utilizes a radio frequency quadrupole for acceleration between the polarized source and the Alvarez linac. It is anticipated that future polarized H(+) sources will have a considerably improved output. The RFQ will operate at 201.25 MHz and will be capable of handing a beam current of 0.02 amperes with a duty cycle of 0.25%. The low average power allows novel solutions to the problems of vane alignment, RF current contacts, and removal of heat from the vanes. The cavity design philosophy is discussed together with the thermodynamics of heat removal from the vane.