Test Whats new message.
Scheduled Maintenance on Monday 1/13/2025
Single article sales and account management will be unavailable from 5:00 AM - 7:00 PM ET (09:00 - 23:00 UTC). We apologize for the inconvenience.
Showing 1-25 of 28 results
- Sort
Filter Results
Show
Sort By
Results
Electric shock hazards have been addressed for 50 years, arc flash hazards for about 40 years, and acoustic hazards for about 30 years. There are two distinctly different types of acoustic injury, from sonic pressure waves and from supersonic blast waves. The type of acoustic hazard is a function of the nature of the release of energy by the arc source.This paper will cover acoustic hazards of arc...Show More
Synopsis of Pulse Modulator for Beam Chopper in LANSCE Particle Accelerator
Bang L.H. Nguyen;Henry John Gaus;Gregory E. Dale;Joe Bradley
2023 IEEE 2nd Industrial Electronics Society Annual On-Line Conference (ONCON)
Year: 2023 | Conference Paper |
Particle accelerators apply electromagnetic field to drive charged particles at high speed and high energy, called beam, to specific targets a wide range of experiments in nuclear physics and materials science. Beam chopper is a critical device responsible for controlling the timing and intensity of accelerated particle beams. This paper provides a comprehensive synopsis of the pulse modulator sys...Show More
Electric Shock Hazards Beyond 50/60 HZ and DC
Lloyd B. Gordon;Jesse Liechty;Joseph Bradley;Lee Merrill;Henry Gauss
The effects of shock from alternating current (ac) power frequencies (50 and 60 Hz) and from direct. current (dc) has been studied for a century and thresholds for safety are now clearly defined in worker safety standards (i.e., NFPA 70E). However, shock thresholds for other frequencies and waveforms are not clearly stated in U.S. worker electrical safety standards. This includes frequencies of su...Show More
MHD Modeling of Shock Physics Experiments with the Phelix Portable High Magnetic Field Drive
C.L. Rousculp;M.S. Freeman;T.J. Voorhees;D.A. Fredenburg;J.R. Griego;D.M. Oro;A.R. Patten;J.T. Bradley;R.E. Reinovsky;P.M. Donovan;J.T. Dunwoody;F. Fierro;J.C. Lamar;F.G. Mariam;L.P. Neukirch;R. B. Randolph;W. A. Reass;A. Saunders;S. K. Sjue;Z. Tang;P. J. Turchi
The PHELIX portable pulsed power driver has recently completed a set of experiments examining the response of granular material to convergent shock loading. Here a nearly 4 MA peak current is delivered to a Z-pinch load with a quarter wave cycle time of ~3 us. This produces B ~ 0.30 MG field at the surface of a ~3 cm diameter, 1 mm thick, 3 cm tall Al liner. The liner is accelerated to ~800 km/s b...Show More
MHD Modeling of Shock Physics Experiments with the Phelix Portable High Magnetic Field Drive
C.L. Rousculp;M.S. Freeman;T.J. Voorhees;D.A. Fredenburg;J.R. Griego;D.M. Oro;A.R. Patten;J.T. Bradley;R.E. Reinovsky;P.M. Donovan;J.T. Dunwoody;F. Fierro;J.C. Lamar;F.G. Mariam;L.P. Neukirch;R. B. Randolph;W. A. Reass;A. Saunders;S. K. Sjue;Z. Tang;P. J. Turchi
Year: 2019 | Conference Paper |
MHD Modeling of Shock Physics Experiments with the PHELIX Portable High Magnetic Field Drive
C.L. Rousculp;M.S. Freeman;T.J. Voorhees;D.A. Fredenburg;J.R. Griego;D.M. Oro;A.R. Patten;J.T. Bradley;R.E. Reinovsky;P.M. Donovan;J.T. Dunwoody;F. Fierro;J.C. Lamar;F.G. Mariam;L.P. Neukirch;R. B. Randolph;W. A. Reass;A. Saunders;S. K. Sjue;Z. Tang;P. J. Turchi
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)
Year: 2018 | Conference Paper |
The PHELIX portable pulsed power driver has recently completed a set of experiments examining the response of granular material to convergent shock loading. Here a nearly 4 MA peak current is delivered to a Z-pinch load with a quarter wave cycle time of ~3 μs. This produces B ~ 0.30 MG field at the surface of a ~3 cm diameter, 1 mm thick, 3 cm tall Al liner. The liner is accelerated to ~800 km/s b...Show More
MHD Modeling of Shock Physics Experiments with the PHELIX Portable High Magnetic Field Drive
C.L. Rousculp;M.S. Freeman;T.J. Voorhees;D.A. Fredenburg;J.R. Griego;D.M. Oro;A.R. Patten;J.T. Bradley;R.E. Reinovsky;P.M. Donovan;J.T. Dunwoody;F. Fierro;J.C. Lamar;F.G. Mariam;L.P. Neukirch;R. B. Randolph;W. A. Reass;A. Saunders;S. K. Sjue;Z. Tang;P. J. Turchi
Year: 2018 | Conference Paper |
Cylindrical Driven Shocks in Ceria
M. S. Freeman;C. L. Rousculp;D. A. Fredenburg;J. T. Bradley;P. M. Donovan;J. T. Dunwoody;F. Fierro;J. R. Griego;J. C. Lamar;F. G. Mariam;L. P. Neukirch;D. M. Oro;A. R. Patten;R. B. Randolph;W. A. Reass;R. E. Reinovsky;A. Saunders;S. K. Sjue;Z. Tang;P. J. Turchi;T. J. Voorhees
2018 16th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)
Year: 2018 | Conference Paper |
Cited by: Papers (1)
Shock compression of granular ceria (CeO2) was studied in converging cylindrical geometry using LANL proton radiography, and driven by the Precision High Energy-Density Liner Implosion Experiment (PHELIX) magnetic implosion system. PHELIX delivered nearly 4 MA to a 1.25-mm thick liner-impactor to magnetically accelerate it to ~0.8-1.0 mm μs−1. The impactor launched a shock in the cylindrical Al ou...Show More
Cylindrical Driven Shocks in Ceria
M. S. Freeman;C. L. Rousculp;D. A. Fredenburg;J. T. Bradley;P. M. Donovan;J. T. Dunwoody;F. Fierro;J. R. Griego;J. C. Lamar;F. G. Mariam;L. P. Neukirch;D. M. Oro;A. R. Patten;R. B. Randolph;W. A. Reass;R. E. Reinovsky;A. Saunders;S. K. Sjue;Z. Tang;P. J. Turchi;T. J. Voorhees
Year: 2018 | Conference Paper |
Lansce RF system refurbishment
D. Rees;G. Bolme;J. Bradley;S. Kwon;J. Lyles;M. Lynch;M. Prokop;W. Reass;K. Young
The Los Alamos Neutron Science Center (LANSCE) is in the planning phase of a refurbishment project that will sustain reliable facility operations well into the next decade. The LANSCE accelerator was constructed in the late 1960s and early 1970s and is a national user facility that provides pulsed protons and spallation neutrons for defense and civilian research and applications. The refurbishment...Show More
Lansce RF system refurbishment
D. Rees;G. Bolme;J. Bradley;S. Kwon;J. Lyles;M. Lynch;M. Prokop;W. Reass;K. Young
Year: 2007 | Conference Paper |
Quantitative evaluation of magnet hysteresis effects at LANSCE with respect to magnet power supply specifications
J. Bradley;W. Roybal;W. Reass;J. Sandoval;M. Fresquez;L. Fernandez;C. Andrews
2007 IEEE Particle Accelerator Conference (PAC)
Year: 2007 | Conference Paper |
The proton beam in the LANSCE accelerator is guided and focused almost exclusively by electromagnets. Magnet hysteresis has had significant impacts on the tuning of the LANSCE accelerator. Magnet hysteresis can also have an impact on magnet power supply (MPS) control, regulation and repeatability requirements. To date, MPS performance requirements have been driven by the requirements on the magnet...Show More
Spallation Neutron Source High Power RF Installation and Commissioning Progress
M. McCarthy;D. Anderson;R. Fuja;P. Gurd;T. Hardek;Y. Kang;J. Bradley;K. Young;D. Rees;W. Roybal
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Cited by: Papers (1)
The Spallation Neutron Source (SNS) linac will provide a 1 GeV proton beam for injection into the accumulator ring. In the normal conducting (NC) section of this linac, the Radio Frequency Quadupole (RFQ) and six drift tube linac (DTL) tanks are powered by seven 2.5 MW, 402.5 MHz klystrons and the four coupled cavity linac (CCL) cavities are powered by four 5.0 MW, 805 MHz klystrons. Eighty-one 55...Show More
5 MW 805 MHz SNS RF System Experience
K. Young;J. Bradley;T. Hardek;M. Lynch;D. Rees;W. Roybal;P. Tallerico;P. Torrez
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
The RF system for the 805 MHz normal conducting linac of the Spallation Neutron Source (SNS) accelerator was designed, procured and tested at Los Alamos National Laboratory (LANL), and then installed and commissioned at Oak Ridge National Laboratory (ORNL). The RF power for the room temperature coupled cavity linac (CCL) of the SNS accelerator is generated by four, pulsed 5 MW peak-power klystrons...Show More
Installation and Testing for Commissioning of Normal Conducting RF Linac Segment in the SNS
Y. Kang;A. Aleksandrov;D. Anderson;M.M. Champion;M.S. Champion;M. Crofford;C. Deibele;G. Dodson;R. Fuja;P. Gibson;P. Gurd;T. Hardek;G. Johnson;P. Ladd;H. Ma;M. McCarthy;M. Piller;J. Tang;A. Vassioutchenko;D. Williams;J. Billen;J. Bradley;D. Rees;W. Roybal;J. Stovall;K. Young;L. Young
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Cited by: Papers (1)
The Spallation Neutron Source (SNS) linac will deliver a 1.0 GeV proton beam to its accumulator ring. The normal conducting segment of the linac has a radio frequency quadrupole (RFQ), six drift tube linac (DTL) tanks powered by seven 402.5 MHz klystrons and four coupled cavity linac (CCL) modules powered by four 805 MHz klystrons that deliver the 180 MeV beam to the superconducting section of the...Show More
Installation and Testing for Commissioning of Normal Conducting RF Linac Segment in the SNS
Y. Kang;A. Aleksandrov;D. Anderson;M.M. Champion;M.S. Champion;M. Crofford;C. Deibele;G. Dodson;R. Fuja;P. Gibson;P. Gurd;T. Hardek;G. Johnson;P. Ladd;H. Ma;M. McCarthy;M. Piller;J. Tang;A. Vassioutchenko;D. Williams;J. Billen;J. Bradley;D. Rees;W. Roybal;J. Stovall;K. Young;L. Young
Year: 2005 | Conference Paper |
Lansce RF System Refurbishment
D. Rees;G. Bolme;J. Bradley;S. Kwon;J. Lyles;M. Lynch;M. Prokop;W. Reass;P. Tallerico
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Cited by: Papers (1)
The Los Alamos Neutron Science Center (LANSCE) is in the planning phase of a refurbishment project that will sustain reliable facility operations well into the next decade. The linear accelerator was constructed in the late 1960s and commissioned as the Los Alamos Meson Physics Facility (LAMPF) in 1972. As the mission changed, LANSCE became a national user facility that provides pulsed protons and...Show More
Spallation neutron source 550 kW (805 MHz) klystron transmitter systems
D. Gapp;N. Jaitly;G. Schofield;E. Fonseca;D. Husovsky;R. Johnson;R. White;S. Davis;J. Luna;R. Crumley;W. Powell;J. Bradley;D. Rees;K. Young
Conference Record of the Twenty-Sixth International Power Modulator Symposium, 2004 and 2004 High-Voltage Workshop.
Year: 2004 | Conference Paper |
The spallation neutron source (SNS) being built at the Oak Ridge National Lab (ORNL) in Tennessee includes a one GeV proton linac, which requires 3 distinct types of RF systems. The radio frequency quadrapole (RFQ) and the drift tube linac (DTL) have 2.5-MW peak, 402.5 MHz, klystron transmitters installed. The coupled-cavity linac (CCL) and the two energy corrector cavities utilize a 5-MW peak, 80...Show More
Pallation neutron source 2.5 MW (402.5 MHZ), and 5 MW (805 MHZ) klystron transmitter systems
D. Gapp;N. Jaitly;G. Schofield;E. Fonseca;D. Husovsky;R. Johnson;R. White;S. Davis;J. Luna;R. Crumley;W. Powell;J. Bradley;D. Ree;K. Young
Conference Record of the Twenty-Sixth International Power Modulator Symposium, 2004 and 2004 High-Voltage Workshop.
Year: 2004 | Conference Paper |
The Spallation Neutron Source (SNS) being built at the Oak Ridge National Lab (ORNL) in Tennessee includes a one GeV proton linac, which requires 3 distinct types of RF systems. The radio frequency quadrapole (RFQ) and the drift tube linac (DTL) have 2.5-MW peak, 402.5 MHz, klystron transmitters installed. The coupled-cavity linac (CCL) and the two high energy beam transport (HEBT) cavities utiliz...Show More
Capabilities, performance, and future possibilities of high frequency polyprase resonant converters
W.A. Reass;D.M. Baca;J.T. Bradley;T.L. Hardek;S.I. Kwon;M.T. Lynch;D.E. Rees
Conference Record of the Twenty-Sixth International Power Modulator Symposium, 2004 and 2004 High-Voltage Workshop.
Year: 2004 | Conference Paper |
High frequency polyphase resonant power conditioning (PRPC) techniques developed at Los Alamos National Laboratory (LANL) are now being utilized for the Oak Ridge National Laboratory (ORNL) Spallation Neutron Source (SNS) accelerator klystron RF amplifier power systems. Three different styles of polyphase resonant converter modulators were developed for the SNS application. The various systems ope...Show More
Capabilities, performance, and future possibilities of high frequency polyphase resonant converters
W.A. Reass;D.M. Baca;J.T. Bradley;T.L. Hardek;S.I. Kwon;M.T. Lynch;D.E. Rees
Fifth IEEE International Vacuum Electronics Conference (IEEE Cat. No.04EX786)
Year: 2004 | Conference Paper |
Cited by: Papers (2)
High Frequency Polyphase Resonant Power Conditioning (PRPC) techniques are now being utilized for the Oak Ridge National Laboratory (ORNL) Spallation Neutron Source (SNS) accelerator klystron RF amplifier power systems. Component improvements realized with the SNS effort coupled with new applied engineering techniques have resulted in dramatic changes in RF power conditioning topology. With resona...Show More
Spallation Neutron Source high-power RF transmitter design for high availability, ease of installation and cost containment
J. Bradley;D. Rees;T. Hardek;M. Lynch;W. Roybal;P. Tallerico
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (2)
The availability goals and installation schedule for the Spallation Neutron Source (SNS) have driven the availability and installation of the SNS linac's high-power RF systems. This paper discusses how the high-power RF systems' availability and installation goals have been addressed in the RF transmitter design and procurement. Design features that allow RF component failures to be quickly diagno...Show More
Neutron-induced failure tests of 3300-V IGBTs for the Spallation Neutron Source accelerator
D.L. Borovina;J.T. Bradley;M. Pieck;R.S. Przeklasa;T.W. Hardek;M.T. Lynch;D.E. Rees;P.J. Tallerico;W.A. Reass;S.A. Wender;B.E. Takala;S.C. Ruggles
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (5)
The RF transmitters for the 1-GeV Spallation Neutron Source (SNS) linear accelerator are powered by 15 converter-modulator stations. Each converter-modulator provides pulses up to 11 MW peak power with a 1.1 MW average power to a multiple-klystron load. A low-voltage switching network, comprised of three sets of four IGBTs in an 'H-bridge' configuration, is used to generate the 20 kHz drive wavefo...Show More
The SNS linac high power RF system design, status, and results
D. Rees;J. Bradley;K. Cummings;T. Hardek;M. Lynch;W. Roybal;P. Tallerico
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (5)
The Spallation Neutron Source being built at the Oak Ridge National Lab in Tennessee requires a 1 GeV proton linac. Los Alamos has responsibility for the RF systems for the entire linac. The linac requires 3 distinct types of RF systems: 2.5-MW peak, 402.5 MHz, RF systems for the RFQ and DTL (7 systems total); 5-MW peak, 805 MHz systems for the CCL and the two energy corrector cavities (6 systems ...Show More
The RF system design for the Spallation Neutron Source
D. Rees;M. Lynch;P. Tallerico;W. Roybal;K. Cummings;T. Hardek;J. Bradley;W. Reass;A. Regan
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (4)
Spallation Neutron Source (SNS) accelerator includes a nominally 1000 MeV, 2 mA average current linac consisting of a radio frequency quadrupole (RFQ), drift tube linac (DTL), coupled cavity linac (CCL), a medium and high beta superconducting (SC) linac, and two buncher cavities for beam transport to the ring. Los Alamos is responsible for the RF systems for all sections of the linac. The SNS lina...Show More
Operational experience with two types of 2 MW HVDC power supplies on LEDA
J. Bradley;D. Rees;R. Przeklasa;R. Jaitly;G. Schofield;M. Scott
Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)
Year: 1999 | Conference Paper |
The high voltage DC power supplies are predicted to be the most expensive component of the accelerator at the Accelerator Production of Tritium (APT) plant. Two different types of candidate HV power supplies are being tested on the Low Energy Demonstration Accelerator (LEDA) at Los Alamos National Laboratory. The first type uses SCRs in a twelve pulse topology with a spark gap crowbar. The second ...Show More
Diagnostics and analysis of incident and vapor shield plasmas in PLADIS I, a coaxial deflagration gun for tokamak disruption simulation
Tokamak disruption simulation experiments have been conducted at the University of New Mexico using the PLADIS I plasma gun system. Earlier work had characterized the plasma-surface interaction in terms of parameters such as incident energy from bucket calorimeter measurements and rough measurements of beam area from flat damage targets. A variety of new plasma diagnostics have been used to furthe...Show More
An overview of the Low Energy Demonstration Accelerator (LEDA) project RF systems
J. Bradley;K. Cummings;M. Lynch;D. Rees;W. Roybal;P. Tallerico;L. Toole
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)
Year: 1997 | Conference Paper |
Cited by: Papers (6)
Successful operation of the Accelerator Production of Tritium (APT) plant will require that accelerator downtime be kept to an absolute minimum. Over 230 separate 1 MW RF systems are expected to be used in the APT plant, making the efficiency and reliability of these systems two of the most critical factors in plant operation. The Low Energy Demonstration Accelerator (LEDA) being constructed at Lo...Show More
Test wire for high voltage power supply crowbar system
Digest of Technical Papers. 11th IEEE International Pulsed Power Conference (Cat. No.97CH36127)
Year: 1997 | Conference Paper |
The klystron microwave amplifier tubes used in the low energy demonstration accelerator (LEDA) and to be used in the accelerator production of tritium (APT) plant have a strict upper limit on the amount of energy which can be safely dissipated within the klystron's vacuum envelope during a high voltage arc. One way to prevent damage from occurring to the klystron microwave amplifier tube is throug...Show More
Pulsed power diagnostics on the PLADIS I plasma gun
Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference
Year: 1995 | Conference Paper |
Cited by: Papers (1)
Tokamak disruption simulation experiments are being conducted at the University of New Mexico (USA) using the PLADIS I plasma gun system. PLADIS I is a high power, high energy coaxial plasma gun configured to produce an intense plasma beam. The inductance and capacitance of the PLADIS I gun circuit are adjusted to produce a current pulse with a full width half max (FWHM) time of 100 /spl mu/s. Can...Show More
IEEE Account
Purchase Details
Profile Information
Need Help?
- US & Canada: +1 800 678 4333
- Worldwide: +1 732 981 0060
- Contact & Support
- About IEEE Xplore
- Contact Us
- Help
- Accessibility
- Terms of Use
- Nondiscrimination Policy
- Sitemap
- Privacy & Opting Out of Cookies
A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity.
© Copyright 2025 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.