A description is given of those features of the University of Minnesota proton linear accelerator which extend the design of the Berkeley linear accelerator. These features are: three separate resonant cavities in series which produce, respectively, beams of 10-, 40-, and 68-Mev protons, as well as appreciable currents when desired at energies between 25 and 68 Mev; a 500-kv ac injector; a 200-Mc amplifier system with three isolated output stages producing 0.6, 2.2, and 3.2 Mwof pulsed power; automatic frequency control systems; phase detectors; phase shifters; magnets; shielding and accessory equipment. The characteristics of the output proton beams are described, and a brief statement is made of the experiments being performed.
Measurements of the radio-frequency phase at several points in the Argonne 50 MeV linac have been made, with and without proton beam, in an attempt to define the maximum phase changes and phase-shift rates that must be expected in the NAL 200 MeV linac. The initial results suggest that at the high-energy end of the tank a 22 mA beam produces a maximum phase shift of the order of 8° with a slope of at least 0.16 degree per microsecond. The magnitude and speed of the phase shift are both smaller as one goes farther toward the main drive loop. These results are only preliminary, as a better understanding of the effects of the rf amplitude control servo may show that it is modifying the phase performance of the system.
I Se•li•_n w••• 1 of Linac laboratory Date ~ November 7, 196c I Catego'' 0230 w•rial TM-94 Subject COAXIAL TRANSMISSION LINE FOR THE NAL 200 MEV LINAC SUMMARY: Manufacturers' ratings of several large rigid coaxial transmission lines are examined and compared to the experience of other laboratories using similar lines to transmit rf power to proton linac accelerating cavities. It is concluded that nominal 9" line should be adequate for the NAL 200 MeV linac.
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