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in creator/contributor: "Denhoy, B."

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Vacuum system for Advanced Test Accelerator

The Advanced Test Accelerator (ATA) is a pulsed linear electron beam accelerator designed to study charged particle beam propagation. ATA is designed to produce a 10,000 amp 50 MeV, 70 ns electron beam. The electron beam acceleration is accomplished in ferrite loaded cells. Each cell is capable of maintaining a 70 ns 250 kV voltage pulse across a 1 inch gap. The electron beam is contained in a 5 inch diameter, 300 foot long tube. Cryopumps turbomolecular pumps, and mechanical pumps are used to … more

Date: September 3, 1981

Creator: Denhoy, B.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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2$sup 0$K vacuum pumping system for Baseball II

A vacuum pumping system that provides a cryo surface for condensing and freezing of H/sub 2/ gas is described. A closed-loop vacuum system was designed and built at Lawrence Livermore Laboratory to pump down the neutralizer LH/sub e/ dewar with a volurae of 350 l and the lambda point dewar with a LH/sub e/ volume of 250 l. Both of these dewars can be pumped down simultaneously or one at a time. 100% of the H/sub e/ gas is recovered free of contaminations. The vacuum pump can handle 340 SCFM of … more

Date: August 20, 1973

Creator: Denhoy, B.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Frozen ammonia micropellet generator for Baseball II-T

A ''startup'' plasma at the center of the Baseball II-T magnet was studied. This startup plasma will be used as a target for high energy neutral beams to achieve the required build-up. The target plasma will be created by irradiating a solid pellet with a laser beam. Although a deuterium pellet would be superior because of purity, the development of an ammonia pellet was undertaken because it requires a simpler technology. The ammonia target plasma is physically acceptable for the initial exper… more

Date: October 28, 1975

Creator: Denhoy, B.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Baseball II-T, a new target plasma startup experiment

A brief description is given of modifications and additions to the existing Baseball II experiment. These changes will make it possible to study target plasma buildup in a steady-state magnetic field. This experiment, now called Baseball II-T$sup +$ will use a pellet generator to deliver ammonia pellets into the center of the magnetic mirror field where they will be heated with a 300-J, 50-ns, CO$sub 2$ laser. The plasma created by this method will have a density of approximately 10$sup 13$ cm$… more

Date: November 14, 1975

Creator: Chargin, A.; Denhoy, B.; Frank, A. & Thomas, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Degassing a large LHe cryopump

A method has been developed and successfully tested to degas a large LHe cryopump. Use of this method inhibits the normally excessive pressure rise during the degassing cycle when the degassing rate exceeds the external pumping capabilities of the system. A small appendage pump, installed close to the main cryopump, absorbs all the gas, as it is desorbed from the main cryopump, with no rise in the system pressure. The appendage pump can then be isolated from the main vacuum system and degassed … more

Date: October 1, 1977

Creator: Denhoy, B. S.; Batzer, T. H. & Call, W. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mechanical design for TMX injector system

The injector system for the Tandem Mirror Experiment (TMX) contains the components required to create and maintain a high-temperature, high-density plasma. These components include a streaming-plasma gun in each of the plug tanks to form the target-plasma, 24 neutral-beam source modules for injecting neutral deuterium atoms to heat and replace losses from the plasma, and a gas box system that applies a streaming cold gas to the plasma to stabilize it. This paper discusses the mechanical design … more

Date: October 17, 1977

Creator: Calderon, M.O.; Chen, F.F.K. & Denhoy, B.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Vibrational, thermal, and alignment considerations of the laser system for Baseball II-T

Designing the Baseball II-T laser system required addressing a number of mechanical parameters. Among them are low frequency floor vibrations, high acoustical noise levels, and large thermal fluctuations in the vicinity of the experiment. In addition, the 8-in. apertures from the 300-K environment of the laser system had to be compatible with the cryogenic environment of the superconducting Baseball magnet. This paper discusses these problems and describes their influence on the laser system de… more

Date: November 1, 1975

Creator: Thomas, S. R., Jr.; Chargin, A.; Denhoy, B. & Johnson, B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Laser-start-up system for magnetic mirror fusion

A CO/sub 2/ laser system has been developed at LLL to provide hot start-up plasmas for magnetic mirror fusion experiments. A frozen ammonia pellet is irradiated with a laser power density in excess of 10/sup 13/ W/cm/sup 2/ in a 50-ns pulse. This system uses commercially available laser systems. Optical components were fabricated both by direct machining and standard techniques. The technologies used in this system are directly applicable to reactor scale systems.

Date: May 20, 1976

Creator: Frank, A. M.; Thomas, S. R.; Denhoy, B. S. & Chargin, A. K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design for the magnetic field requirements of the tandem mirror experiment

The tandem mirror magnetic geometry is described, followed by an analysis of the magnet set designed to meet the requirements of the TMX experiment. The final magnet line-up is composed of a baseball coil with two C coils for each plug, six solenoidal coils for the central cell, and two RC coils plus one octupole coil for each transition.

Date: October 10, 1977

Creator: Chen, F. K.; Chargin, A. K.; Denhoy, B. S. & Waugh, A. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Various ATA notes: 60, 79, 116, and 136

The purpose of note No. 60 is to outline the reasons why it is important to develop and test a steam ejector for use on the differential pumping station. Note No. 79 discusses two stream instability of an electron beam in the differential pumped transport section. Note No. 116 covers the steam ejector prototype unit (Stage 1). And lastly, note No. 136 presents the results of a survey done to find the commercially available equipment to meet differential pump requirements for the Advanced Test A… more

Date: October 24, 1994

Creator: Caporaso, G.; Denhoy, B.; Hanson, C. L. & Chambers, F. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Final design of the neutral beam lines for the Tokamak Fusion Test Reactor

Final design of the neutral beam lines for TFTR has been completed. A prototype has been assembled at Lawrence Berkeley Laboratory and is undergoing testing as part of the Neutral Beam System Test Facility (NBSTF). The final neutral beam line (NBL) configuration differs in several details from that previously reported upon; certain components have been added; and testing of the cryopump system has led to some design simplification. It is these developments which are reported herein.

Date: November 13, 1979

Creator: Pittenger, L.C.; Valby, L.E.; Stone, R.R.; Pedrotti, L.R.; Denhoy, B. & Yoard, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

TMX magnets: mechanical design

The Tandem Mirror Experiment (TMX) system, part of the Lawrence Livermore Laboratory magnetic mirror program incorporates in its design various types of coils or magnets. This paper describes the physical construction of each coil within the system as well as the structural design required for their support and installation.

Date: September 27, 1977

Creator: Hinkle, R. E.; Harvey, A. R.; Calderon, M. O.; Chargin, A. K.; Chen, F. F. K.; Denhoy, B. S. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department