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in creator/contributor: "Valdiviez, R."

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THE DESIGN AND HIGH-HEAT FLUX TESTING OF AN INTERCEPTIVE-DIAGNOSTIC DEVICE FOR A PROTON BEAM

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Date: December 1, 2000

Creator: VALDIVIEZ, R. & AL, ET

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

PATRAN and P/THERMAL Applications for Thermal Modeling. [SP-100 Ground Engineering Station]

The standard that has been established over the last decade or so in performing numerical modeling for analysis purposes is to make creation of the computational grid and results presentation less time and effort consuming than the analysis function itself. Software packages known as pre- and post-processors have been developed and made available in various forms and sizes for the engineering analyst's use. These packages reduce the effort and time required of the analyst to perform pre- and po… more

Date: July 1, 1991

Creator: Valdiviez, R. & Crea, B. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

INTENSE PROTON CORE AND HALO BEAM PROFILE MEASUREMENT: BEAM LINE COMPONENT MECHANICAL DESIGN

The 6.7-MeV, 100-mA proton beam being produced in the Low Energy Demonstration Accelerator (LEDA) RFQ will be injected into a 52-magnet lattice in order to study the formation of beam halo [1]. The LEDA RFQ beam has a rms size of 1 mm. At nine longitudinal locations along the lattice an assembly that incorporates both a wire scanner and a halo-scraper assembly will be placed to make current density measurements of the beam.

Date: October 1, 2000

Creator: VALDIVIEZ, R.; PATTERSON, N. & AL, ET

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

THE HIGH-HEAT FLUX TESTING OF AN INTERCEPTIVE DEVICE FOR AN INTENSE PROTON BEAM

An interceptive device referred to here as a scraper has been designed and tested for use in a diagnostic device [1]. The scraper will be used to probe a proton beam in order to detect the formation of beam halo [2]. Probing the proton beam exposes the scraper to high heat fluxes on the order of 610 kW/cm{sup 2}. The high-heat flux exposure is cyclic since the beam is probed while in pulsed mode. In order to test the design repetitive high-heat flux testing has been performed on a prototype des… more

Date: April 1, 2001

Creator: VALDIVIEZ, R.; MARTINEZ, F. A. & AL, ET

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

THE FINAL MECHANICAL DESIGN, FABRICATION, AND COMMISSIONING OF A WIRE SCANNER AND SCRAPER ASSEMBLY FOR HALO-FORMATION MEASUREMENTS IN A PROTON BEAM

The 6.7 MeV, 100 mA proton beam being produced in the Low Energy Demonstration Accelerator (LEDA) RFQ is being injected into a 52 magnet lattice in order to study the charged-beam phenomenon known as beam halo [1]. Quadrupole magnets in the lattice are purposely mismatched to cause or amplify halo formation in the beam. Interceptive diagnostics that consist of a thin wire and a paddle type device called a scraper are placed in the beam to obtain charge-distribution data. The charge-distribution… more

Date: April 1, 2001

Creator: VALDIVIEZ, R.; MARTINEZ, F. Z. & AL, ET

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Testing of vacuum pumps for APT/LEDA RFQ

Two vacuum systems were designed and built for the RFQ (Radio Frequency Quadrupole) cavity in the APT/LEDA (Low Energy Demonstration Accelerator) linac. The gas load from the proton beam required very high hydrogen pump speed and capacity, The gas load from the high power RF windows also required very high hydrogen pump speed for the RF window vacuum system. Cryopumps were chosen for the RFQ vacuum system and ST185 sintered nonevaporable getter (NEG) cartridges were chosen for the RF window vac… more

Date: December 31, 1998

Creator: Kishiyama, K.; Shen, S.; Behne, D.; Wilson, N.G.; Schrage, D. & Valdiviez, R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Testing of vacuum pumps for the Accelerator Production of Tritium/Low Energy Demonstration Accelerator radio frequency quadrupole

Two vacuum systems were designed and built for the RFQ (Radio Frequency Quadrupole) cavity in the APT/LEDA (Low Energy Demonstration Accelerator) linac. The gas load from the proton beam required very high hydrogen pump speed and capacity. The gas load from the high power RF windows also required very high hydrogen pump speed for the RF window vacuum system. Cryopumps were chosen for the RFQ vacuum system and ST185 sintered non-evaporable getter (NEG) cartridges were chosen for the RF window va… more

Date: December 31, 1998

Creator: Kishiyama, K.; Shen, S.; Behne, D.; Wilson, N.G.; Schrage, D. & Valdiviez, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The mechanical design and fabrication of a ridge-loaded waveguide for an RFQ

A Radio Frequency Quadrupole (RFQ) accelerator with an RF power input of 2 MW and an H{sup +} beam output current of 100 mAmps at 6.7 MeV, continuous duty factor utilizes twelve nearly identical ridge-loaded waveguides. The ridge-loaded, vacuum waveguides couple the RF power to the RFQ accelerating cavity. The mechanical design and fabrication of the ridge-loaded waveguides are the topics of this paper.

Date: December 31, 1998

Creator: Valdiviez, R.; Roybal, P.; Clark, B.; Martinez, F.; Casillas, D.; Gonzales, G. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Testing of vacuum pumps for APT/LEDA RFQ

Two vacuum systems were designed and built for the RFQ (Radio Frequency Quadrupole) cavity in the APT/LEDA (Low Energy Demonstration Accelerator) linac. The gas load from the proton beam required very high hydrogen pump speed and capacity. The gas load from the high power RF windows also required very high hydrogen pump speed for the RF window vacuum system. Cryopumps were chosen for the RFQ vacuum system and ST185 sintered non- evaporable getter (NEG) cartridges were chosen for the RF window v… more

Date: August 6, 1998

Creator: Behne, D.; Shen, S.; Valdiviez, R.; Wilson, N. G. & Schrage, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Testing of vacuum system for APT/LEDA RFQ

The authors have designed, built and operated two vacuum systems for the RFQ (Radio Frequency Quadrupole) in the APT/LEDA (Accelerator Production of Tritium/Low Energy Demonstration Accelerator)linac: a cryopump system for the RFQ cavity and a non-evaporable getter (NEG) pump system for the RF window system. They were designed to provide very high hydrogen pump speed (> 2 x 10{sup 4} L/s) and sorption capacity. Both systems underwent performance tests in mock assembly before the installation… more

Date: March 25, 1999

Creator: Behne, D.; Berg, J.; DaCosta, M.; Harper, M.; Kishiyama, K.; Schrage, D. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High-heat flux testing of an interceptive device for an intense proton beam

Date: April 1, 2001

Creator: Valdiviez, R. (Robert); Martinez, F. A. (Felix A.); Rendon, Armando M.; Nguyen, D. C. (Dinh C.); Earley, L. M. (Lawrence M.) & La Fave, R. P. (Richard P.)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The mechanical design of a proton microscope for radiography at 800 MeV

A proton microscope has been developed for radiography applications using the 800-MeV linear accelerator at the Los Alamos Neutron Science Center (LANSCE). The microscope provides a magnified image of a static device, or of a dynamic event such as a high-speed projectile impacting a target. The microscope assembly consists primarily of four Permanent Magnet Quadrupoles (PMQ's) that are supported on movable platforms. The platform supports, along with the rest of the support structure, are desig… more

Date: January 1, 2003

Creator: Valdiviez, R. (Robert); Sigler, F. E. (Floyd E.); Barlow, D. B. (David B.); Blind, B. (Barbara); Jason, A. J. (Andrew J.); Mottershead, C. T. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

BEAM-PROFILE INSTRUMENTATION FOR BEAM-HALO MEASUREMENT : OVERALL DESCRIPTION, OPERATION, AND BEAM DATA.

The halo experiment presently being conducted at the Low Energy Demonstration Accelerator (LEDA) at Los Alamos National Laboratory (LANL) has specific instruments that acquire horizontally and vertically projected particle-density beam distributions out to greater than 10{sup 5}:1 dynamic range. They measure the core of the distributions using traditional wire scanners, and the tails of the distribution using water-cooled graphite scraping devices. The wire scanner and halo scrapers are mounted… more

Date: January 1, 2001

Creator: Gilpatrick, J. D. (John Douglas); Barr, D. S. (Dean S.); Day, L. A. (Lisa A.); Stettler, M. W. (Matthew W.); Valdiviez, R. (Robert); Gruchalla, M. (Michael) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Design and operation of a proton microscope for radiography at 800 MEV

A high-magnification high-resolution option is desirable for the study of small-scale dynamic experiments at the LANSCE 800-MeV Proton Radiography Facility. Magnification is achievable by either repowering the existing imaging-lens quadrupoles, using new high-gradient quadrupoles, or some hybrid combination of the two. The large and complex parameter space of magnetic optics solutions was studied extensively with the 3rd order optics code MARYLIE. Some of the hybrid solutions achieve magnificat… more

Date: January 1, 2003

Creator: Mottershead, C. T.; Barlow, D. B. (David B.); Blind, B. (Barbara); Hogan, G. E. (Gary E.); Jason, A. J. (Andrew J.); Merrill, F. E. (Frank E.) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

BEAM-PROFILE INSTRUMENTATION FOR BEAM-HALO MEASUREMENT : OVERALL DESCRIPTION AND OPERATION

Within the halo experiment presently being conducted at the Low Energy Demonstration Accelerator at Los Alamos National Laboratory, specific beam instruments that acquire horizontally and vertically projected particle-density distributions out to greater than 10{sup 5}:1 dynamic range are located throught the 52-magnet halo lattice.

Date: January 1, 2001

Creator: Gilpatrick, J. D. (John Douglas); Barr, D. S. (Dean S.); Day, L. A. (Lisa A.); Kerstiens, D. M. (Debora M.); Stettler, M. W. (Matthew W.); Valdiviez, R. (Robert) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

EXPERIENCE WITH THE LOW ENERGY DEMONSTRATION ACCELERATOR (LEDA) HALO EXPERIMENT BEAM INSTRUMENTATION

A 52 quadrupole-magnet FODO lattice has been assembled and operated at the Los Alamos National Laboratory. The purpose of this lattice is to provide a platform to measure the resulting beam halo as the first few magnets of the lattice produce various mismatch conditions. These data are then compared with particle simulation so that halo formation mechanisms may be better understood. The lattice is appended to the LEDA 6.7-MeV radio frequency quadrupole (RFQ) and is followed by a short high-ener… more

Date: January 1, 2001

Creator: Gilpatrick, J. D. (John Douglas); Barr, D. S. (Dean S.); Colestock, P. L. (Patrick L.),; Day, L. A. (Lisa A.); Sellyey, W. C. (William C.); Shurter, R. B. (Robert B.) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Final mechanical design, fabrication, and commissioning of a wire scanner and scraper assembly for halo-formation measurements in a proton beam

Date: April 1, 2001

Creator: Valdiviez, R. (Robert); Martinez, F. A. (Felix A.); Rendon, Armando M.; Wright, T. O. (Tony O.); Ledford, J. E. (John E.); Patterson, N. K. (Norman K.) et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department