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in creator/contributor: "Hansborough, L. D."

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Brazing techniques for side-coupled electron accelerator structures

The collaboration between the Los Alamos National Laboratory and the National Bureau of Standards (NBS), started in 1979, has led to the development of an advanced c-w microtron accelerator design. The four 2380-MHz NBS accelerating structures, containing a total of 184 accelerating cavities, have been fabricated and delivered. New fabrication methods, coupled with refinements of hydrogen-furnace brazing techniques described in this paper, allow efficient production of side-coupled structures. … more

Date: January 1, 1986

Creator: Hansborough, L. D.; Clark, W. L.; DePaula, R. A.; Martinez, F. A.; Roybal, P. L.; Wilkerson, L. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Linear Accelerator for Radioisotope Production

A 200- to 500-..mu..A source of 70- to 90-MeV protons would be a valuable asset to the nuclear medicine program. A linear accelerator (linac) can achieve this performance, and it can be extended to even higher energies and currents. Variable energy and current options are available. A 70-MeV linac is described, based on recent innovations in linear accelerator technology; it would be 27.3 m long and cost approx. $6 million. By operating the radio-frequency (rf) power system at a level necessary… more

Date: February 1, 1982

Creator: Hansborough, L. D.; Hamm, R. W. & Stovall, J. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Fabrication and tuning techniques for side-coupled electron accelerator structures

Beginning in 1979, Los Alamos entered into a collaboration with the National Bureau of Standards (NBS) to develop an advanced cw microtron accelerator. The accelerating structures (one 0.9-m-long, one 2.7-m-long, and two 4.0-m-long) containing a total of 184 accelerating cavities have been fabricated and tuned to the 2380-MHz operating frequency. New methods simplified the fabrication of these structures and eliminated several furnace-brazing steps. These fabrication methods, lathe-mounted tuni… more

Date: January 1, 1986

Creator: Hansborough, L. D.; Clark, W. L.; DePaula, R. A.; Martinez, F. A.; Roybal, P. L.; Wilkerson, L. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design and fabrication of a radially-fed implosion heating coil

A radially-fed implosion heating coil has been designed and fabricated at the Los Alamos Scientific Laboratory. The M arshall coil is a copper-plate-on-epoxy-substrate coil designed to utilize up to 200- kV to produce a 1-T magnetic field in a 20-cm bore with a risetime of no more than 250-ns. The design and fabrication process of this coil and the design of the high-voltage stand for the Marshall coil are discussed.

Date: January 1, 1977

Creator: Hansborough, L. D.; Dickinson, J. M.; Melton, J. G. & Nunnally, W. C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Vacuum design for the disk-and-washer accelerator structure

The disk-and-washer (DAW) accelerator structure is being developed for several applications. Because of its complicated geometry and newness, vacuum calculations for the DAW accelerator structure are not yet formalized. The applicable vacuum equations for this structure are presented and correlations for it have been made with the vacuum data from the Clinton P. Anderson Meson Physics Facility side-coupled accelerator structure. A calculation is presented for the DAW structure proposed for the … more

Date: February 1, 1982

Creator: Ruhe, J. R. & Hansborough, L. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Vacuum properties of sintered SmCo/sub 5/ magnets

There are many desirable applications of powerful, rare-earth permanent magnets made of sintered SmCo/sub 5/ material within vacuum systems. One application is the use of large numbers of SmCo/sub 5/ magnets to provide the undulating magnetic field in a free-electron-laser wiggler structure. Tests were conducted at Los Alamos to determine the suitability of SmCo/sub 5/ magnets in a vacuum environment of approx. 10/sup -6/ torr. The vacuum performances of the wiggler system, with and without the… more

Date: December 1, 1981

Creator: Warren, R. W.; DePaula, R. F. & Hansborough, L. D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Mechanical design of RFQ resonator cavities in the 400-MHz frequency range

Many RFQ resonator-cavity design concepts have been proposed in the 400-MHz frequency range. Los Alamos has been evaluating RFQ resonator-cavity designs that provide acceptable combinations of necessary mechanical features, easy tunability and long-term stability. Four RFQ resonator test cavities have been fabricated to test rf joints between the RFQ vanes and the resonator cavity. Two of these joints (the C-seal and the rf clamp-joint) allow vane movement for tuning. These test data, and the d… more

Date: January 1, 1981

Creator: Hansborough, L. D.; Potter, J. M. & Wilson, N. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Laboratory performance of the BEAR (Beam Experiment Aboard Rocket) RFQ (radio-frequency quadrupole)

The BEAR (Beam Experiment Aboard Rocket) accelerator will be part of an experiment to demonstrate the operation of an ion accelerator in space and to characterize the exoatmospheric propagation of a neutral particle beam. The RFQ (radio-frequency quadrupole) has been designed to produce a 25-mA H/sup /minus// beam with an emittance of 0.01 cm-mrad (rms normalized) at an energy of 1 MeV. Because of the rigors of spaceflight, the accelerator design has been constrained by factors not normally app… more

Date: January 1, 1988

Creator: O'Shea, P. G.; Schrage, D. L.; Young, L. M.; Zaugg, T. J.; Lynch, M. T.; McKenna, K. F. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Accelerator drift-tube braze-joint failures in the PIGMI APF cavity

During the assembly of the Alternating Phase Focusing cavity for the PIGMI Prototype proton accelerator, recurring failures of drift-tube braze joints occurred. In the fabrication technique, a torch braze was used to attach the stems to both the drift-tube body and the stem termination; all materials used were stainless steel. The assemblies were copper plated, using bright-acid-leveling copper plating. Some braze joints, although satisfactorily tension-tested before plating, later failed at a … more

Date: January 1, 1981

Creator: Hansborough, L. D.; Levinson, L. S.; Reiswig, R. D. & Wilkerson, L. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Low-temperature thermodynamic bottoming cycles for fusion reactors

Possible application of thermodynamic bottoming cycles to fusion reactors is examined. Thermodynamic and cost data for many possible working fluids are incomplete. Geothermal research is the primary source of fluid data. Bottoming cycles should be fully integrated into the energy conversion system to achieve maximum effectiveness. Scavenging by a bottoming cycle of low-level energy may be possible but not attractive with present conceptual fusion reactor designs. The best use of a bottoming cyc… more

Date: January 1, 1976

Creator: Hansborough, L. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Development of a 110-m-mA, 75-keV proton injector for high-current, CW linacs

A dc proton injector is being developed for a 6.7 MeV CW RFQ at Los Alamos. The RFQ input beam requirements are 75 keV energy, 110 mA dc proton current, and 0.20 {pi}mm-mrad rms normalized emittance. The injector has now produced a 75-keV, 117-mA dc proton beam (130 mA total current) with the required emittance. The emittance has been measured after a 2.1 m long two-solenoid beam transport system. The measured emittance can be explained in terms of the ion source emittance and beam transport th… more

Date: September 1, 1996

Creator: Sherman, J. D.; Bolme, G. O. & Hansborough, L. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Radio-frequency-quadrupole linac in a heavy ion fusion driver system

A new type of linear accelerator, the radio-frequency quadrupole (RFQ) linac, is being developed for the acceleration of low-velocity ions. The RFQ accelerator can be adapted to any high-current applications. A recent experimental test carried out at the Los Alamos Scienific Laboratory (LASL) has demonstrated the outstandig properties of RFQ systems. The test linac accepts a 30-mA proton beam of 100-keV energy and focuses, bunches, and accelerates the beam to an energy to 640 keV. This ia done … more

Date: January 1, 1980

Creator: Hansborough, L. D.; Stokes, R.; Swenson, D. A. & Wangler, T. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mechanical engineering of a 75-keV proton injector for the Low Energy Demonstration Accelerator

A dc injector capable of 75-keV, 110-mA proton beam operation is under development for the Low Energy Demonstration Accelerator (LEDA) project at Los Alamos. The injector uses a dc microwave proton source which has demonstrated 98% beam availability while operating at design parameters. A high-voltage isolation transformer is avoided by locating all ion source power supplies and controls at ground potential. The low-energy beam transport system (LEBT) uses two solenoid focusing and two steering… more

Date: October 1, 1997

Creator: Hansborough, L. D.; Hodgkins, D. J.; Meyer, E. A.; Schneider, J. D.; Sherman, J. D.; Stevens, R. R. Jr. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Comparison of Simulations with Measurements for the LEDA LEBT H

The Low-Energy Demonstration Accelerator (LEDA) injector is designed to provide 75-keV, 110-mA, proton beams for the LEDA RFQ. After testing the LEDA injector using a 1.25-MeV, CW RFQ, the authors shortened the low-energy beam transport (LEBT) to 2.69 m, replaced the first LEBT solenoid with one that has a shorter length but the same focusing power, and installed and operated the LEDA injector in the beam tunnel. In this paper the authors use the TRACE, SCHAR, and PARMELA computer codes to mode… more

Date: March 29, 1999

Creator: Smith, H. V.; Figueroa, T. L.; Hansborough, L. D.; Harrington, M. P.; Johnson, K. F.; Kerstiens, D. M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Proton Beam Verification using RF Power Measurement Data for a cw Radio Frequency Quadrupole LINAC

A cw radio frequency quadrupole (RFQ) LINAC section and klystrode based rf system was obtained from the Chalk River Laboratories and was recommissioned at LANL to conduct demonstration proton beam experiments in support of a spallation neutron source driver for tritium production. A variation of the Low Energy Demonstration Accelerator (LEDA) proton injector, modified to operate at 50 keV, was mated to the RFQ and was operated to support the high current (up to 100 mA), proton beam advance stud… more

Date: March 29, 1999

Creator: Bolme, G. O.; Hardek, T. W.; Hansborough, L. D.; Hodgkins, D. J.; Keffeler, D. R.; Sherman, J. D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Material end-plugging for the Scylla IV-P linear theta pinch

Scylla IV-P is a 5-m linear theta pinch at the Los Alamos Scientific Laboratory primarily used to study end effects of linear theta-pinch plasmas. One method that may be used to reduce plasma end loss from linear theta pinches is to insert material end plugs. Two different assemblies that insert end plugs have been fabricated and installed on Scylla IV-P. The presence of the material end plugs have been found to increase the plasma confinement time by 20 to 30 percent; the plasma stability is i… more

Date: January 1, 1977

Creator: Hansborough, L. D.; Cole, T. R.; Commisso, R. J. & Williamson, K. D., Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department