Author details
Author's Published Works
Author details
Showing 1-25 of 48 results
- Sort
Sort By
Results
Magnetic Designs of New First Target Beamline Magnets for the ORNL SNS Upgrade
V. Kashikhin;J. Amann;N. Evans;D. Harding;J. Holmes;M. Plum;D. Pomella
The Spallation Neutron Source (SNS) at ORNL currently is being upgraded from 1.0 GeV to 1.3 GeV. Several water-cooled magnets should be upgraded to transport 30% of higher beam energy. New chicane, injection/extraction septum, and Lambertson magnets were designed. Designing the magnets was a challenging task because the new magnets required good combined integrated field quality and needed to occu...Show More
SNS proton power upgrade requirements for magnet and kicker systems
2017 IEEE 21st International Conference on Pulsed Power (PPC)
Year: 2017 | Conference Paper |
Cited by: Papers (2)
The Spallation Neutron Source (SNS) Proton Power Upgrade (PPU) will double the beam power from 1.4 to 2.8 MW by adding cavities in the superconducting linear accelerator (SCL) which will increase the beam energy from 0.97 to 1.3 GeV and by increasing the average linac beam current from 26 to 38 mA. Provisions for an accelerator power increase were made in the original SNS project, and these are be...Show More
Performance of SNS Front end and warm linac
A. Aleksandrov;S. Assadi;W. Blokland;P. Chu;S. Cousineau;V. Danilov;C. Deibele;J. Galambos;D. Jeon;S. Henderson;M. Plum;A. Shishlo;M. Stockli;Y. Zhang
The Spallation Neutron Source accelerator systems will deliver a 1.0 GeV, 1.4 MW proton beam to a liquid mercury target for neutron scattering research. The accelerator complex consists of an H-injector, capable of producing one-ms-long pulses at 60 Hz repetition rate with 38 mA peak current, a 1 GeV linear accelerator, an accumulator ring and associated transport lines. The 2.5 MeV beam from the ...Show More
Experimental tests of a prototype system for active damping of the e-p instability at the lanl PSR
C. Deibele;S. Assadi;S. Danilov;S. Henderson;M. Plum;D. Gilpatrick;R. McCrady;R. Macek;J. Power;T. Zaugg;J. Byrd;S. Breitzman;S. Y. Lee;M. Pivi;M. Schulte;A. Polisetti;Z. Xie
A prototype of an analog, transverse feedback system for damping of the two-stream (e-p) instability has been developed and successfully tested at the Los Alamos Proton Storage Ring (PSR). This paper describes the system configuration, results of several experimental tests and studies of system optimization along with studies of the factors limiting its performance.Show More
Experimental tests of a prototype system for active damping of the e-p instability at the lanl PSR
C. Deibele;S. Assadi;S. Danilov;S. Henderson;M. Plum;D. Gilpatrick;R. McCrady;R. Macek;J. Power;T. Zaugg;J. Byrd;S. Breitzman;S. Y. Lee;M. Pivi;M. Schulte;A. Polisetti;Z. Xie
Year: 2007 | Conference Paper |
Simulation study and initial test of the SNS ring RF system
Y. Zhang;H. Ma;M. Champion;P. Chu;S. Cousineau;V. Danilov;T. Hardek;J. Holmes;M. Piller;M. Plum
The rfsimulator code was developed for the study of the Spallation Neutron Source (SNS) dual-harmonic ring RF control. It uses time-domain solvers to compute beam- cavity interactions and FFT methods to simulate the time responses of the linear RF system. The important elements of the system considered in the model include beam loading, dynamic cavity detuning, circuit bandwidth, loop delay, propo...Show More
Spallation neutron source (SNS) diamond stripper foil development
R.W. Shaw;M.A. Plum;L.L. Wilson;C.S. Feigerle;M.J. Borden;T. Spickermann;Y. Irie;I. Sugai;A. Takagi
Diamond stripping foils are under development for the SNS. Freestanding, flat 300 to 500 mug/cm2 foils as large as 17 x 25 mm2 have been prepared. These nano-textured polycrystalline foils are grown by microwave plasma- assisted chemical vapor deposition in a corrugated format to maintain their flatness. They are mechanically supported on a single edge by a residual portion of their silicon growth...Show More
Active damping of the E-P instability at the LANL PSR
R. McCrady;R. Macek;T. Zaugg;S. Assadi;C. Deibele;S. Henderson;M. Plum;S. Y. Lee;S. Walbridge;J. Byrd;M. Pivi
2007 IEEE Particle Accelerator Conference (PAC)
Year: 2007 | Conference Paper |
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 National Laboratory 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). Evidence obtained ...Show More
Orbit injection dump simulations of the H0 and H- Beams
2007 IEEE Particle Accelerator Conference (PAC)
Year: 2007 | Conference Paper |
Simulations of the transport of H0 and H- beams to the spallation neutron source (SNS) ring injection dump are carried out using the ORBIT code. During commissioning and early operations, beam losses in this region have been the highest in the accelerator and have presented the most obvious hurdle to cross in achieving high intensity operation. Two tracking models are employed: 1) a piecewise cont...Show More
Experimental characterization of the spallation neutron source accumulator ring collimation system
2007 IEEE Particle Accelerator Conference (PAC)
Year: 2007 | Conference Paper |
The SNS ring and associated transport lines, commissioned in January 2006, are designed to accumulate and deliver up to 1.5e14, 1 GeV protons at 60 Hz to a liquid mercury target for neutron production. In order to control activation and to allow for routine hands- on maintenance of accelerator components, beam loss in most of the ring must remain below 1 W/m. For the full 1.4 MW beam, this transla...Show More
Laser stripping of H- beams: theory and experiments
V. Danilov;S. Aleksandrov;S. Assadi;W. Blokland;S. Cousineau;C. Deibele;W. Grice;S. Henderson;J. Holmes;Y. Liu;M. Plum;A. Shishlo;A. Webster;I.N. Nesterenko;L. Waxer
2007 IEEE Particle Accelerator Conference (PAC)
Year: 2007 | Conference Paper |
Thin carbon foils are used as strippers for charge exchange injection into high intensity proton rings. However, the stripping foils become radioactive and produce uncontrolled beam loss, which is one of the main factors limiting beam power in high intensity proton rings. Recently, we presented a scheme for laser stripping an H- beam for the Spallation Neutron Source ring. First, H- atoms are conv...Show More
The Spallation Neutron Source accelerator complex consists of a 2.5 MeV H" front-end injector system, a 186 MeV normal-conducting linear accelerator, a 1 GeV superconducting linear accelerator, an accumulator ring, and associated beam transport lines. The linac was commissioned in five discrete runs, starting in 2002 and completed in 2005. The accumulator ring and associated beam transport lines w...Show More
Comparative study on lifetime of stripper foil using 650 keV H- Ion beam
A. Takagi;I. Sugai;Y. Takeda;Y. Irie;R.W. Shaw;C.S. Feigerle;M.A. Plum
2007 IEEE Particle Accelerator Conference (PAC)
Year: 2007 | Conference Paper |
Thick carbon stripper foils of >300 mug/cm2 will be used as a stripping of H-ion beam for 3 GeV rapid cycling synchrotron (3 GeV-RCS) of the J-PARC. The carbon foils with long lifetime even at >1800degK are required. For this purpose, we have developed a new irradiation system for the lifetime measurement using high current pulsed and dc H- beams of the KEK Cockcroft-Walton accelerator. These high...Show More
SNS* Ring Extraction Kicker System
Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium
Year: 2006 | Conference Paper |
Cited by: Papers (1)
The spallation neutron source (SNS) has recently completed the commissioning of its 1.0 GeV proton storage ring, which included the ring extraction kicker system. This extraction system is comprised of fourteen high-voltage Blumlein-configured pulse-forming networks switched by fourteen thyratrons. The system also includes fourteen Blumlein control racks, which provide a high-voltage source, monit...Show More
Beam Parameter Measurement and Control at the SNS Target
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Cited by: Papers (1)
The spallation neutron production target at the SNS facility is designed for 1.4 MW beam power. Both beam position and profile must be carefully controlled within narrow margins to avoid damage to the target. The position must be within 2 mm of the target center, and 90% of the beam must be within the nominal 70 mm × 200 mm spot size, without exceeding 0.18 A/m2peak beam current density. This is a...Show More
Beam Dynamics Studies and Beam Quality in the SNS Normal-Conducting Linac
A. Aleksandrov;D. Bartkoski;P. Chu;S. Cousineau;V. Danilov;G. Dodson;J. Galambos;S. Henderson;D. Jeon;M. Plum;M. Stockli
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
The Spallation Neutron Source accelerator systems will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. The accelerator complex consists of an H-injector capable of producing 38 mA peak current, a 1 GeV linear accelerator, an accumulator ring and associated transport lines. The linear accelerator consists of a Drift Tube Linac, a Coupled-Cavity Linac and a Su...Show More
Feasibility Study of Using an Electron Beam for Profile Measurements in the SNS Accumulator Ring
A. Aleksandrov;S. Assadi;S. Cousineau;V. Danilov;S. Henderson;M. Plum;P. Logatchov;A. Starostenko
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Cited by: Papers (1)
The electron beam probe method was suggested for measuring profiles in high power beams. In this method, deflection of a low energy electron beam by the collective field of the high intensity beam is measured. The charge density in the high intensity beam can be restored under certain conditions or estimated by various mathematical techniques. We studied the feasibility of using the electron beam ...Show More
Transverse Beam Matching Application for SNS
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Cited by: Papers (1)
An automated transverse beam matching application has been developed for the Spallation Neutron Source (SNS) beam transport lines. The application is written within the XAL Java framework and the matching algorithm is based on the simplex optimization method. Other functionalities, such as emittance calculated from profile monitor measurements (adopted from a LANL Fortran code), profile monitor di...Show More
Studies Performed in Preparation for the Spallation Neutron Source Accumulator Ring Commissioning
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
The Spallation Neutron Source accumulator ring will compress 1.5×1014, 1 GeV protons from a 1 ms bunch train to a single 695 ns proton bunch for use in neutron spallation. Due to the high beam power, unprecedented control of beam loss will be required in order to control radiation and allow for hands-on maintenance in most areas of the ring. A number of detailed investigations have been performed ...Show More
Techniques for Measurement and Correction of the SNS Accumulator Ring Optics
S. Henderson;P. Chu;S. Cousineau;V. Danilov;J. Holmes;T. Pelaia;M. Plum
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
The Spallation Neutron Source (SNS) Accumulator Ring will reach peak intensities of 1.5×1014protons/pulse through multi-turn charge-exchange injection. Accumulation of these unprecedented beam intensities must be accomplished while maintaining extremely low losses (less than 1 W/m). It is anticipated that the understanding and control of the ring optics will be important for achieving these low lo...Show More
The SNS laser profile monitor design and implementation
S. Assadi;A. Aleksandrov;W. Blokland;A. DeCarlo;C. Deibele;P. Gibson;W. Grice;M. Hechler;T. Hunter;J. Kelly;P. Ladd;G. Murdoch;M. Plum;J. Pogge;K. Potter;D. Purcell;T. Shea;D. Stout
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (2)
After a successful demonstration of a nonintercepting beam profile monitor for the H/sup -/ beams at the 750 KeV and the 200 MeV LINAC at Brookhaven National Laboratory, the SNS project approved using a Nd:YAG laser rather than the traditional carbon wire for transverse profile monitors in the SNS superconducting LINAC. Experiments have also been performed on SNS 2.5 MeV medium energy beam transpo...Show More
The SNS linac wire scanner system
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (3)
The linac wire scanner system for the Spallation Neutron Source (SNS) at Oak Ridge, TN, calls for 5 units in the medium energy beam transport (MEET), 5 in the drift tube linac (DTL), 8 in the coupled cavity linac (CCL), and 13 in the high energy beam transport (HEBT). The actuators are a custom design fabricated by Huntington Mechanical Laboratories. Four different strokes are required to cover th...Show More
Spallation Neutron Source ring diagnostics
P. Cameron;J. Brodowski;P. Cerniglia;R. Connolly;J. Cupolo;C. Dawson;C. Degen;A. DellaPenna;D. Gassner;R. Gonzalez;M. Grau;J. Gullotta;L. Hoff;A. Huhn;M. Kesselman;C. Liaw;J. Mead;R. Sikora;G. Smith;K. Vetter;M. Wilinski;S. Assadi;W. Blokland;C. Diebele;D. Purcell;T. Shea;M. Plum;R. Witkover
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Brookhaven is providing the Ring and Transfer Lines Beam Diagnostics for the Spallation Neutron Source (SNS), to be installed at Oak Ridge National Laboratory. The customary diagnostics that will be present include beam position monitors (BPM), ionization profile monitors (IPM), beam loss monitors (BLM), beam current monitors (BCM), coherent tune measurement, and wire scanners. An overview of thes...Show More
Spallation Neutron Source ring diagnostics
P. Cameron;J. Brodowski;P. Cerniglia;R. Connolly;J. Cupolo;C. Dawson;C. Degen;A. DellaPenna;D. Gassner;R. Gonzalez;M. Grau;J. Gullotta;L. Hoff;A. Huhn;M. Kesselman;C. Liaw;J. Mead;R. Sikora;G. Smith;K. Vetter;M. Wilinski;S. Assadi;W. Blokland;C. Diebele;D. Purcell;T. Shea;M. Plum;R. Witkover
Beam position monitor systems for the SNS linac
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (1)
The 402.5- and 805-MHz beam position and phase monitors for the Spallation Neutron Source linac are based on standard PC technology. The SNS beam is to be injected into a storage ring with a 1-MHz circulation frequency requiring 650-ns-long minipulses. The injection cycle takes 1 ms and the machine can run at rates up to a 60 Hz. The RF input signals are down converted to 50 MHz and sampled at 40 ...Show More
Recent experience with inductive insert at PSR
K.Y. Ng;D. Wildman;M. Popovic;A. Browman;D. Fitzgerald;R. Macek;M. Plum;T. Spickermann
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
In a Fermilab-Los Alamos collaboration, inductances constructed of ferrite cores sufficient to cancel a large fraction of the space charge potential-well distortion were installed in the Los Alamos Proton Storage Ring (PSR) as one means of raising the threshold for the two-stream e-p instability. When operating at higher intensities and with sufficient inductance added for full space-charge compen...Show More
Electron proton two-stream instability at the PSR
R.J. Macek;A. Browman;D. Fitzgerald;R. McCrady;F. Merrill;M. Plum;T. Spickermann;T.S. Wang;J. Griffin;K.Y. Ng;D. Wildman;K. Harkay;R. Kustom;R. Rosenberg
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (7)
A strong, fast, transverse instability has long been observed at the Los Alamos Proton Storage Ring (PSR) where it is a limiting factor on peak intensity. Most of the available evidence, based on measurements of the unstable proton beam motion, is consistent with an electron-proton two-stream instability. The need for higher beam intensity at PSR and for future high-intensity, proton drivers has m...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.