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Active Pointing Control of Pulsed, High-Power Laser Beam After 65-Meter Transport
2022 IEEE 17th International Conference on Control & Automation (ICCA)
Year: 2022 | Conference Paper |
Laser-Assisted Charge Exchange (LACE) requires the position and angle of a high-power laser beam to be stable at the sub-millimeter and sub-milliradian level at a point 65 meters from the laser. Due to the high laser power and improvised nature of the laser transport line, the laser beam suffers from pointing instabilities in the form of drift and pulse-to-pulse jitter. A closed-loop Laser Pointin...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
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
Simulation of the CERN PS booster performance with 160 MeV H- injection from LINAC4
2007 IEEE Particle Accelerator Conference (PAC)
Year: 2007 | Conference Paper |
The ultimate luminosity (2.3 x 1034 cm-2 s-1) in the LHC can only be reached or even exceeded if a major upgrade of the CERN proton injector complex takes place. The first identified bottleneck towards higher brightness beams is the 50 MeV proton injection of Linac2 into the PS booster (PSB). Doubling the intensity in the PSB can be achieved with a new linac (Linac4), which increases the injection...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
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
Painting Self-Consistent Beam Distributions in Rings
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
We define self-consistent beam distributions to have the following properties: 1) time-independence or periodicity, 2) linear space charge forces, and 3) maintainance of their defining shape and density under all linear transformations. The periodic condition guarantees zero space-charge-induced halo growth and beam loss during injection. Some self-consistent distributions can be manipulated into ...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
Self-Consistent Electron-Cloud Simulation for Long Proton Bunches
A. Shishlo;Y. Sato;S. Cousineau;V. Danilov;S. Henderson;J. Holmes;R. Macek;S.Y. Lee
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
The results of numerical self-consistent electron-cloud simulations are presented and compared with data from the Proton Storage Ring at LANL. The ORBIT code with a recently developed electron-cloud module has been used. The model includes fully coupled “proton bunch – electron cloud” dynamics, a multipacting process model with a realistic secondary emission surface model, and a realistic lattice ...Show More
Benchmarking of Simulation Codes Based on the Montague Resonance in the CERN Proton Synchrotron
I. Hofmann;G. Franchetti;M. Giovannozzi;E. Metral;J. Qiang;R. Ryne;S. Cousineau;J. Holmes;A. Luccio;J. Amundson;P. Spentzouris;F.W. Jones;S. Machida
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Experimental data on emittance exchange by the space charge driven “Montague resonance” have been obtained at the CERN Proton Synchrotron in 2002-04 as a function of the working point. These data are used to advance the benchmarking of major simulation codes (ACCSIM, IMPACT, MICROMAP, ORBIT, SIMBAD, SIMPSONS, SYNERGIA) currently employed world-wide in the design or performance improvement of high ...Show More
Benchmark of Space Charge Simulations and Comparison with Experimental Results for High Intensity, Low Energy Accelerators
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Space charge effects are a major contributor to beam halo and emittance growth leading to beam loss in high intensity, low energy accelerators. As future accelerators strive toward unprecedented levels of beam intensity and beam loss control, a more comprehensive understanding of space charge effects is required. A wealth of simulation tools have been developed for modeling beams in linacs and rin...Show More
XAL Application Programming Structure
J. Galambos;C. Chu;S. Cousineau;V. Danilov;J. Patton;T. Pelaia;A. Shishlo;C.K. Allen
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Cited by: Papers (8)
XAL is an application programming framework used at the Spallation Neutron Source (SNS) project in Oak Ridge. It is written in Java, and provides users with a hierarchal view of the accelerator. Features include database configuration of the accelerator structure, an online envelope model that is configurable from design or live machine values, an application framework for quickstart GUI developme...Show More
4.2 K Operation of the SNS Cryomodules
I.E. Campisi;S. Assadi;F. Casagrande;M. Champion;P. Chu;S. Cousineau;M. Crofford;C. Deibele;J.D. Galambos;P. Gurd;D. Hatfield;M. Howell;D. Jeon;Y.W. Kang;K. Kasemir;Z. Kursun;H. Ma;M. Piller;D. Stout;W. Strong;A. Vassioutchenko;Y. Zhang
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Cited by: Papers (2)
The Spallation Neutron Source being built at Oak Ridge National Laboratory employs eighty one 805 MHz superconducting cavities operated at 2.1 K to accelerate the H-beam from 187 MeV to about 1 GeV. The superconducting cavities and cryomodules with two different values of beta (. 61 and .81) have been designed and constructed at Jefferson Lab for operation at 2.1 K with unloaded Q’s in excess of 5...Show More
4.2 K Operation of the SNS Cryomodules
I.E. Campisi;S. Assadi;F. Casagrande;M. Champion;P. Chu;S. Cousineau;M. Crofford;C. Deibele;J.D. Galambos;P. Gurd;D. Hatfield;M. Howell;D. Jeon;Y.W. Kang;K. Kasemir;Z. Kursun;H. Ma;M. Piller;D. Stout;W. Strong;A. Vassioutchenko;Y. Zhang
Year: 2005 | Conference Paper |
Exploration of beam fault scenarios for the Spallation Neutron Source target
S. Henderson;S. Cousineau;V. Danilov;J. Holmes;T. McManamy;D. Raparia;A. Fedotov;Y.Y. Lee;J. Wei
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (2)
The Spallation Neutron Source (SNS) accelerator systems will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. In order to ensure adequate lifetime of the target system components, requirements on several beam parameters must be maintained. A series of error studies was performed to explore credible fault scenarios which can potentially violate the various bea...Show More
The commissioning plan for the Spallation Neutron Source ring and transport lines
S. Henderson;S. Assadi;S. Cousineau;G. Dodson;V. Danilov;J. Galambos;J. Holmes;K. Reece;T. Shea;D. Raparia;M. Blaskiewicz;Y.Y. Lee;Y. Papaphilippou;J. Wei
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
The Spallation Neutron Source (SNS) accelerator systems will provide a 1 GeV, 1.44 MW proton beam to a liquid mercury target for neutron production. In order to satisfy the accelerator systems' portion of the critical decision 4 (CD-4) commissioning goal (which marks the completion of the construction phase of the project), a beam pulse with intensity greater than 1/spl times/10/sup 13/ protons mu...Show More
Simulation tools for high intensity rings
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Several codes have been developed specifically to simulate beam dynamics in high intensity rings. These codes contain detailed algorithms for modeling the relevant physics in the beam, from single particle transport to important collective effects, including space charge and impedances. Among the various codes, a number of different methods have been adopted for the treatment of space charge. The ...Show More
Computational studies of collective beam dynamics in high intensity rings
J.A. Holmes;S. Cousineau;V. Danilov;S. Henderson;A. Shishlo;A. Fedotov
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Collective interactions of the beam with itself and with its periodic lattice surroundings in high intensity accelerator rings, such as PSR and SNS, can lead to beam growth, halo generation, and losses. These interactions also provide a rich source of dynamic phenomena for analytical, computational, and experimental study. With continuing increases in model development and computer power, a number...Show More
Integration of the beam scraper and primary collimator in the SNS ring
H. Ludewig;N. Simos;D. Davino;S. Cousineau;N. Catalan-Lasheras;J. Brodowski;J. Touzzolo;C. Longo;B. Mullany;D. Raparia
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (2)
The collimation system in the SNS ring includes a two-stage collimator consisting of a halo scraper and an appropriate fixed aperture collimator. This unit is placed between the first quadru-pole and the first doublet in the collimation straight section of the ring. The scraper is situated at the exact mid-point between these two magnets, and the fixed aperture collimator fills the space between t...Show More
Electron-cloud mitigation in the Spallation Neutron Source ring
J. Wei;M. Blaskiewicz;J. Brodowski;P. Cameron;D. Davino;A. Fedotov;P. He;H. Hseuh;Y.Y. Lee;H. Ludewig;W. Meng;D. Raparia;J. Tuozzolo;S.Y. Zhang;A. Aleksandrov;S. Cousineau;V. Danilov;S. Henderson;M. Furman;M. Pivi;R. Macek;N. Catalan-Lasheras
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (1)
The Spallation Neutron Source (SNS) accumulator ring is designed to accumulate, via H/sup -/ injection, protons of 2 MW beam power at 1 GeV kinetic energy at a repetition rate of 60 Hz. At such beam intensity, electron-cloud is expected to be one of the intensity-limiting mechanisms that complicate ring operations. This paper summarizes mitigation strategy adopted in the design, both in suppressin...Show More
Electron-cloud mitigation in the Spallation Neutron Source ring
J. Wei;M. Blaskiewicz;J. Brodowski;P. Cameron;D. Davino;A. Fedotov;P. He;H. Hseuh;Y.Y. Lee;H. Ludewig;W. Meng;D. Raparia;J. Tuozzolo;S.Y. Zhang;A. Aleksandrov;S. Cousineau;V. Danilov;S. Henderson;M. Furman;M. Pivi;R. Macek;N. Catalan-Lasheras
Measurement of space charge effect on transverse emittance
S. Cousineau;K. Fung;M. Ball;C.M. Chu;V. Derenchuk;G. East;D. Friesel;W. Guo;A. Harbi;S.Y. Lee;T. Sloan;S. Wang;Y. Zhang;J. Holmes;S. Shastry;K.Y. Ng
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
The SNS accumulator ring is designed to compress 1.5/spl times/10/sup 14/ 1 GeV protons from a bunch train of 1000 /spl mu/s H/sup -/ to a single proton bunch with bunch length 700 ns. The injection scenario of the SNS is experimentally simulated at the Cooler Injector Synchrotron (CIS) at Indiana University. A 100 /spl mu/s, 7 MeV H/sup -/ bunch train from the RFQ and DTL is compressed into a sin...Show More
Design optimization and the path towards a 2 MW Spallation Neutron Source
J. Wei;M. Blaskiewicz;N. Catalan-Lasheras;D. Davino;A. Fedotov;Y.Y. Lee;N. Malitsky;Y. Papaphilippou;D. Raparia;A. Shishlo;N. Tsoupas;W. Weng;S.Y. Zhang;R. Keller;J. Staples;J. Stovall;J. Billen;S. Kurennoy;S. Nath;H. Takeda;L. Young;R. Sundelin;A. Aleksandrov;Y. Cho;P. Chu;S. Cousineau;V. Danilov;M. Doleans;J. Galambos;J. Holmes;N. Holtkamp;S. Kim;R. Kustom;D. Jeon;E. Tanke;W. Wan
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (3)
The Spallation Neutron Source (SNS) is designed to ultimately reach an average proton beam power of 2 MW for pulsed neutron production. The SNS physics groups analyze the machine performance within the hardware constraints, optimize the accelerator design, and establish the best path towards a 2 MW and higher Spallation Neutron Source.Show More
Design optimization and the path towards a 2 MW Spallation Neutron Source
J. Wei;M. Blaskiewicz;N. Catalan-Lasheras;D. Davino;A. Fedotov;Y.Y. Lee;N. Malitsky;Y. Papaphilippou;D. Raparia;A. Shishlo;N. Tsoupas;W. Weng;S.Y. Zhang;R. Keller;J. Staples;J. Stovall;J. Billen;S. Kurennoy;S. Nath;H. Takeda;L. Young;R. Sundelin;A. Aleksandrov;Y. Cho;P. Chu;S. Cousineau;V. Danilov;M. Doleans;J. Galambos;J. Holmes;N. Holtkamp;S. Kim;R. Kustom;D. Jeon;E. Tanke;W. Wan
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