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in creator/contributor: "Zaugg, T. J."

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Active Damping of the E-P Instability at the Los Alamos Proton Storage Ring

A prototype of an analog, transverse (vertical) feedback system for active damping of the two-stream (e-p) instability has been developed and successfully tested at the Los Alamos Proton Storage Ring (PSR). This system was able to improve the instability threshold by approximately 30% (as measured by the change in RF buncher voltage at instability threshold). The feedback system configuration, setup procedures, and optimization of performance are described. Results of several experimental tests… more

Date: March 17, 2008

Creator: Macek, R. J.; Assadi, S.; Byrd, J. M.; Deibele, C. E.; Henderson, S. D.; Lee, S. Y. et al.

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

Electron Cloud Generation And Trapping in a Quadrupole Magnet at the Los Alamos PSR

A diagnostic to measure electron cloud formation and trapping in a quadrupole magnet has been developed, installed, and successfully tested at PSR. Beam studies with this diagnostic show that the electron flux striking the wall in the quadrupole is comparable to or larger than in an adjacent drift. In addition, the trapped electron signal, obtained using the sweeping feature of diagnostic, was larger than expected and decayed very slowly with an exponential time constant of 50 to 100 {micro}s. … more

Date: November 14, 2007

Creator: Macek, R. J.; Browman, A. A.; Ledford, J. E.; Borden, M. J.; O'Hara, J. F.; McCrady, R. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Lasing attempts with a microwiggler on the Los Alamos FEL

The APEX FEL normally lases near a wavelength of 3{mu}m using a permanent magnet wiggler with a 2.7-cm period and a linear accelerator of 40-MeV energy. Los Alamos National Laboratory is conducting a series of experiments with the goal of lasing at significantly shorter wavelengths with the same accelerator and the same kind of near-concentric resonator, but using a novel pulsed microwiggler of 0.5-cm period capable of generating a peak field of several tesla. We plan to lase on a fundamental w… more

Date: January 1, 1992

Creator: Warren, R. W.; O'Shea, P. G.; Bender, S. C.; Carlsten, B. E.; Early, J. W.; Feldman, D. W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Lasing attempts with a microwiggler on the Los Alamos FEL

Date: October 1, 1992

Creator: Warren, R. W.; O`Shea, P. G.; Bender, S. C.; Carlsten, B. E.; Early, J. W.; Feldman, D. W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Comparison of beam simulations with measurements for a 1.25-MeV, CW RFQ

The Low-Energy Demonstration Accelerator (LEDA) injector is tested using the Chalk River Injector Test Stand (CRITS) radio-frequency quadrupole (RFQ) as a diagnostic instrument. Fifty-keV, dc proton beams are injected into the 1.25-MeV, CW RFQ and transported to a beamstop. Computer-simulation-code predictions of the expected beam performance are compared with the measured beam currents and beam profiles. Good agreement is obtained between the measurements and the simulations at the 75-mA desig… more

Date: December 1998

Creator: Smith, H. V. Jr.; Bolme, G. O.; Sherman, J. D.; Stevens, R. R. Jr.; Young, L. M. & Zaugg, T. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Doppler-Shift Proton Fraction Measurement on a CW Proton Injector

A spectrometer/Optical Multi-channel Analyzer has been used to measure the proton fraction of the cw proton injector developed for the Accelerator Production of Tritium (APT) and the Low Energy Demonstration Accelerator (LEDA) at Los Alamos. This technique, pioneered by the Lawrence Berkeley National Laboratory (LBNL), was subsequently adopted by the international fusion community as the standard for determining the extracted ion fractions of neutral beam injectors. Proton fractions up to 95 {+… more

Date: December 31, 1998

Creator: Kamperschroer, J. H.; Sherman, J. D.; Zaugg, T. J.; Arvin, A. H.; Bolt, A. S. & Richards, M. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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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

open access

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