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Oxide cathode lifetime improvements at RTNS-II

Description: Results are reported for an ongoing effort to optimize D/sup +/ beam production by the MATS-III ion source used at the RTNS-II. The oxide cathode assembly originally designed for lower power operation has been modified and redesigned for higher electron current yield, longer life and serviceability. A factor of 2.5 has been gained in cathode lifetime due to these changes. The details of the changes and results and benefits in operation and performance are given. In addition, the technique used for manufacture of the filament is described.
Date: September 29, 1986
Creator: Massoletti, D.J.
Partner: UNT Libraries Government Documents Department

Use of molybdenum ion source electrodes at RTNS-II

Description: Reports are reported for an ongoing effort to optimize D+ beam production by the MATS-III ion source used at RTNS-II. The three seven-aperture electrodes, originally consisting of water-cooled copper, have now been tested using uncooled molybdenum and with water cooling on the second (decel) electrode only. Details of the change, the results of the testing, and the benefits in operation, performance and cost are given.
Date: September 29, 1986
Creator: Massoletti, D.J.; Harter, G.A. & Heikkinen, D.W.
Partner: UNT Libraries Government Documents Department

Operation in pulsed mode at RTNS-II

Description: An experiment was done with a D/sup +/ ion source on a test stand, after which the pulsing system was installed on an RTNS-II neutron source to demonstrate its feasibility as an intense pulsed neutron source. The ion source MATS-II was run in the pulsed mode. A maximum current of 115 mA was obtained by arc pulsing, but with a pulse width of more than 200 msec. In the pulsed operation of RTNS-II, the beam was accelerated up to 360 keV and a maximum current of 80 mA was obtained on the rotating target. (LEW)
Date: September 1, 1987
Creator: Junji, Yamamoto; Massoletti, D.J.; Heikkinen, D.W. & Sumita, Kenji
Partner: UNT Libraries Government Documents Department

Electron beam diagnostics using synchrotron radiation at the Advanced Light Source

Description: Synchrotron light emitted from a bend magnet is being used to diagnose the electron beam stored in the main accelerator of the Advanced Light Source (ALS) at Berkeley Lab. The radiation has maximum intensity in the soft X-ray region and is imaged by a Kirkpatrick-Baez mirror pair from the source point inside the ring onto a Bismuth/Germanium-Oxide (BGO) crystal, converted into visible light and magnified by an attached microscope. The final image is captured by a TV camera-tube and digitized by a frame- grabber device to obtain records of parameters such as beam size, center location and profile. Data obtained from this Diagnostic Beam Line have been very useful in day-to-day operation of the ALS storage ring to assess the quality and repeatability of the stored beam. The line has further been utilized in several dedicated research activities to measure bunch lengths under various conditions and observe transverse beam instabilities. A summary of obtained results is given in this paper , together with a description of the technical features of the Diagnostic Beam Line.
Date: May 1996
Creator: Keller, R.; Renner, T. & Massoletti, D. J.
Partner: UNT Libraries Government Documents Department

RTNS-II fusion materials irradiation facility

Description: The Rotating Target Neutron Source (RTNS-II) facility provides an intense source of 14-MeV neutrons for the fusion energy programs of Japan and the United States. Each of the two identical accelerator-based neutron sources is capable of providing source strengths in excess of 3 x 10/sup 13/ n/s using deuteron beam currents up to 150 mA. The present status of the facility, as well as the various upgrade options, will be described in detail.
Date: January 1, 1986
Creator: Heikkinen, D.W.; Tuckerman, D.B.; Davis, J.C.; Massoletti, D.J. & Short, D.W.
Partner: UNT Libraries Government Documents Department

Neutron production by neutral beam sources

Description: Neutron yields, from interactions of multiampere 40- to 120-keV deuterium beams with deuterium atoms implanted in copper targets, have been measured in order to provide input data for shielding of neutral-deuterium beam facilities for magnetic fusion experiments.
Date: November 1, 1979
Creator: Berkner, K.H.; Massoletti, D.J.; McCaslin, J.B.; Pyle, R.V. & Ruby, L.
Partner: UNT Libraries Government Documents Department

Steady state gas efficiency of ion sources for neutral beams

Description: Gas present in the acceleration grids of a neutral beam line is one cause of divergent beam power. A measure of this problem is the gas efficiency (nuclear) of the ion source, epsilon/sub g/ = I/sub b//I/sub g/, where I/sub b/ denotes the extracted current of beam nuclei, and I/sub g/ the total current of nuclei to the source as gas. For a short pulse beam, less than or equal to 0.1 sec, gas transients make epsilon/sub g/ difficult to observe. Using the fraction size Berkeley LPA (nominally 120 keV, 10A), the gas efficiency of a positive ion, hydrogen neutral beam has been studied with pulses from 0.5 to 28 sec at 80 keV, 5.7 A, and 0.5 sec at 120 keV, 10A. The observed gas efficiency, 20% to 40%, is shown to agree with a simple steady state model. The model indicates that gas efficiency is determined by the degree of arc ionization.
Date: September 1, 1981
Creator: Vella, M.C.; Berkner, K.H.; Massoletti, D.J.; Owren, H.M. & Willis, J.E.
Partner: UNT Libraries Government Documents Department

Effect of capacitive stored energy on neutral-beam-accelerator performance

Description: The results of tests to determine the effects of capacitive stored energy (1/2 CV/sup 2/) on the performance of neutral-beam injectors are reported. Typical fault-current waveforms and methods to limit fault current are presented. Tests indicate that deterioration of performance is not only a function of peak stored energy but is also dependent on peak current and the characteristics of the breakdown.
Date: September 1, 1982
Creator: Owren, H.M.; Baker, W.R.; Berkner, K.H.; Hopkins, D.B. & Massoletti, D.J.
Partner: UNT Libraries Government Documents Department