MARK I MTA LINEAR ACCELERATOR RUN NO. 4.

Author: Vetterlein, R. J.
Published: United States : [publisher not identified], 1953.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1953.
Physical Description: microopaque : positive ; 8 x 13 cm
Additional Creators: Livdahl, P. V.

Availability

Finding items...

Summary

Mark I Linear Accelerator Run No. 4 covers the operation from Oct. 7 to Nov. 3, 1952, after a two weeks shutdown for the installation of Inconel overlays on the adjacent surfaces on drift tubes No. 0 and 1. Sparking was not eliminated by the use of Inconel, but immediate, full recovery of cavity voltage after a spark-down was almost always the case, thus permitting far more stable operation. The Inconel baked out rapidly and also resisted spark damage better than the DHP Cu. A 175-ma peak (over twice that obtained in Run No. 3) proton beam was accelerated with r-f voltage of 19 mv and a duty cycle of 1 to 2%. This low duty cycle was due to the inadequately cooled Inconel which was overlaid on the original watercooled DHP surface. Beam operation was almost continuous for four days with very satisfactory operation. Several tests were made to determine the effect of various parameters, e.g., precessor voltage, injector pulse length etc., on the beam. The results of this run were very encouraging as steady operation with high beam currents, approaching the design expectation of 250 ma, was achieved. As sparking was still occurring, it was decided to shut down the accelerator and remove No. 1 drift tube to eliminate the shortest gap in the cavity. Operation under this condition was performed in Run No. 5. (auth)

Report Numbers

LRL-77

Other Subject(s)

Collection

U.S. Atomic Energy Commission depository collection.

Note

DOE contract number: AT(11-1)-74
NSA number: NSA-12-001121
OSTI Identifier 4355090
Research organization: California Research and Development Co., Livermore Research Lab., Livermore, Calif.

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