The facilities oi Argonm' National Laboratory .ii'i' owned by the United State-, IIUMTIInu'iU-Under the terms, of a futitr.uMW-51-109-Kni;-*K t belw n-n the I' S Knergy Ke^ea I"V h .md Development Administration, Argonnv L : JH\ornitH'a A^ouiiti«ui .mil 1 he L'iuwr-.uy >>i Chu.igii. the University employs the staff ami operates the Laboratory :n .uu'rdiiki' with policie.-and programs formulated. approved and reviewed by the A>suu.iti.it i .
The first six niobium split-ring resonator.'-, for the Argonne Heavy-Ion Energy Booster havci been completed. The average performance at 4.2K is an accelerating gradient of 3.7 !W/ra or an effective accelerating potential of 1.3 MV per resonator for an rf input of 4 K/resonator. The resonators are constructed in part of an explosively bonded Kb-Cu composite material which performs well for rf surface fieldu of at least 200 C. In initial tests, the resonators frequently exhibit thermal instability at K a < 3 MV/m because of several cypes of microscopic surface defects. The methods used for locating, identifying, and removing these defects are discussed.
il >i icipoiuibUHy fulnt» of any tnfu u Kd. «r rvpincn ifly »Minl iijthti i the i i the i«ui»c>. rampl(i ittun, »ppjriiu*. ptoduct h » w wauM ARGONNE NATIONAL LABORATORY, ARGONNE, ILLINOIS operated under contract W-31-109-Eng-38 for the U. S. ENERGY RESEARCH AND DEVELOPMENT ADMINISTRATION The facilities of Argonne National Laboratory are cwnutl by the United Suites Onvi-rnment-Under the terms of a contract (W-31-109-Eng-38) between the I' S Kner^y Ro»v.i rth and Development Administration, Argonne Universities Association and The University oi Chicago. thi_ University employs the staff and operates the Laboratory in accordance with policies. And programs formulated, approved and reviewed by the Association
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