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 .
A low-velocity superconducting linac has been developed as part of a positive-ion injector system, which is replacing a 9 MV tandem as the injector for the ATLAS accelerator. The linac consists of an independently phased array of resonators, and is designed to accelerate various ions over a velocity range .008 < v/c < .06. The resonator array is formed of four different types of superconducting interdigital structures. The linac is being constructed in three phases, each of which will cover the full velocity range. Successive phases will increase the total accelerating potential and permit heavier ions to be accelerated. Assembly of the first phase was completed in early 1989. In initial tests with beam, a five-resonator array provided approximately 3.5 MV of accelerating potential and operated without difficulty for several hundred hours. The second phase is scheduled for completion in late 1989, and will increase the accelerating potential to more than 8 MV.
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
The preliminary tests of the superconducting electron cyclotron resonance ion source DECRIS-SC2a) Rev. Sci. Instrum. 83, 02A334 (2012); 10.1063/1.3671746Magnet tests and status of the superconducting electron cyclotron resonance source SERSE Rev.
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