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in subjects: "Resonators 430303* -- Particle Accelerators-- Experimental Facilities & Equipment"  
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Development program for a 200 kW, CW, 110 GHz gyrotron. Quarterly report No. 1, June-September 1979

Description: The objective of this program is the design and development of a millimeter-wave device to produce 200 kW of continuous-wave power at 110 GHz. The device, which will be a gyrotron oscillator, will be compatible with power delivery to an electron-cyclotron plasma. Smooth control of rf power output over a 17 dB range is required, and the device should be capable of operation into a severe time-varying rf load mismatch. Progress toward this goal is described and specifications of the gyrotron are … more
Date: January 1, 1979
Creator: Arnold, K.W.; Tancredi, J.J.; Caplan, M.; Ha, K.W.; Birnbaum, D.N. & Weiss, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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LAMPF 805-MHz accelerator structure tuning and its relation to fabrication and installation

Description: In the course of construction of the 805-MHz linac, it was necessary to set 10,000 resonant cavities to precise frequencies and to check, and in some cases, to adjust the field distribution along the beam axis of the 104 rf tanks composing the linac. Since this was the first proton linac of the side-coupled type ever built, it was necessary to develop new techniques and instrumentation for structure tuning. An outline of the fabrication and installation process is given, showing how the tuning … more
Date: July 1, 1979
Creator: Swain, G.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Voltage breakdown testing for the radio-frequency quadrupole accelerator

Description: Designs of radio-frequency quadrupole (RFQ) accelerators with reasonable length require operation with surface fields above the limit imposed by Kilpatrick's Criterion. A cavity was designed using SUPERFISH to test the validity of this Criterion and to determine operating limits for the RFQ. The experimental setup and procedure are described, as are the data and results. A method of calibrating the test is presented.
Date: January 1, 1979
Creator: Williams, S. W.; Rodenz, G. W.; Humphry, F. J. & Potter, J. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mechanical design considerations in FMIT RFQ development

Description: The mechanical features of the several rf structures that have been made to test the theory of the radio-frequency quadrupole (RFQ) are briefly described. A 425-MHz structure, designed as a proof-of-principle (POP) test, is described in detail. Methods of coupling rf power into the structure, temperature control, tuning, and mode separation are discussed. The methods and setup of N/C machinery used to generate the critical geometry surrounding the RFQ aperture are detailed fully. Finally, the a… more
Date: January 1, 1979
Creator: Fuller, C. W.; Williams, S. W. & Potter, J. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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MEQALAC: a new approach to low beta acceleration

Description: An acceleration system is described which allows one to accelerate high currents of ions at very low velocities. The main principle is to utilize an array of electrostatic quadrupoles in an rf linac drift tube, rather than a single magnetic quadrupole, as is usually the case. Because electrostatic quads can be built with very small apertures, relatively high frequencies can be used. A number of examples are given.
Date: June 1, 1979
Creator: Maschke, A.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High-beta linac structures

Description: Accelerating structures for high-beta linacs that have been and are in use are reviewed in terms of their performance. Particular emphasis is given to room-temperature structures and the disk-and-washer structure. The disk-and-washer structure has many attractive features that are discussed for pulsed high-gradient linacs, for 100% duty-cycle medium-gradient linacs and for high-current linacs requiring maximal amounts of stored energy in the electric fields available to the beam.
Date: January 1, 1979
Creator: Schriber, S.O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Discontinuity effects on radial cavity transmission lines

Description: Pulse propagation in radial cavity transmission lines such as those found on a radial line accelerator is considered. Specifically, the effects of discontinuities along the line are examined in detail. It is found that previous analyses of such effects have been incorrect, and here two alternate solution techniques are presented. Depending upon the parameters of such a radial line, the discontinuity effects considered here may or may not be significant; however, if they are significant, it is r… more
Date: April 1, 1979
Creator: Seidel, D.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Buncher cavity resonant at the first and second harmonic

Description: A buncher is an RF accelerator followed by a drift space. Its purpose is to bunch the dc ion source beam into suitable bunches for acceleration in a linac. The voltage in a simple buncher is a sine wave at the linac frequency. A more elaborate wave form can result in increased capture of ion source beam. The cavities discussed here are resonant at 12.5 and 25 MHz, the first and second harmonic of the Argonne National Laboratory (ANL) low beta linac. They will support a wave form which should gi… more
Date: January 1, 1979
Creator: Foss, M.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Experimental and calculated rf properties of the disk-and-washer structure

Description: A detailed study of the disk-and-washer structure using SUPERFISH has shown that the physical geometry can be optimized to make the structure more efficient than previously reported. The calculated ZT/sup 2/ is equal to that of an equivalent LAMPF cavity (neglecting any losses associated with the side-coupler slots) for ..beta.. = 0.6 and is 30% higher for ..beta.. = 1.0. Several techniques for supporting the washer were studied in addition to the conventional ''L'' supports. Two types of suppo… more
Date: January 1, 1979
Creator: Potter, J. M.; Schriber, S. O. & Humphry, F. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Single-cavity double-frequency buncher

Description: A single-cavity buncher has been developed that resonates at both the fundamental and twice the fundamental frequency to form a more nearly ideal bunching voltage waveform in the gap. The cavity utilizes the TM/sub 020/-like mode as the first harmonic of the fundamental TM/sub 010/-like mode. Field distributions on or near the axis, which are seen by the beam, are essentially identical for the two modes. Many beam bunching applications require two bunchers with the harmonic buncher being physic… more
Date: January 1, 1979
Creator: Schriber, S.O. & Swenson, D.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Room-temperature cavities for high-beta accelerating structures

Description: Properties of several room-temperature cavities for standing-wave linear accelerator structures are discussed. In particular, new results related to the disk-and-washer geometry are presented. Extensive calculations using the computer program SUPERFISH have shown that the ..beta.. = 1.0 the effective shunt impedance is at least 20% higher than that of an equivalent LAMPF cavity, while quality factors can be a factor of two higher.
Date: January 1, 1979
Creator: Schriber, S.O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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