IPAC2015 - List of Authors (Rybarcyk, L.)

Paper	Title	Page
MOPWI033	Advantages to an Online Multi-particle Beam Dynamics Model for High-power Proton Linacs	1234
	L. Rybarcyk, S.A. Baily, X. Pang LANL, Los Alamos, New Mexico, USA
	High-power proton linacs like the 800-MeV LANSCE accelerator typically use a physics-based approach and online single-particle and envelope beam dynamics models to establish nominal set points for operation. However, these models are not good enough to enable immediate transition to high-power operation. Instead, some amount of empirical adjustment is necessary to achieve stable, low beam-loss operation. At Los Alamos, we have been developing a new online model, which employs multiparticle beam dynamics, as a tool for providing more information and insight to the operations staff, especially during this transition to high-power operations. This presentation will discuss some of the advantages and benefits of using this type of tool in the tune-up and operation of a high-power proton linac.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI033
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TUPWI026	A Monochromatic Gamma Source without Neutrons	2292
	R.W. Garnett, S.S. Kurennoy, L. Rybarcyk, T.N. Taddeucci LANL, Los Alamos, New Mexico, USA
	Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396. High-energy gamma rays can be efficiently produced using the direct excitation of the 15.1-MeV level in 12C via the (p, p’) reaction. This reaction has the threshold energy of 16.38 MeV. The threshold for neutron production via 12C (p, n) is 19.66 MeV, so there is an energy window of 3.28 MeV where the 15.1-MeV photons can be produced without any direct neutrons. Thick-target yield estimates indicate that just below the neutron production threshold, the photon output is about twice that of the more well-known 11B (d, n) reaction requiring 4-MeV deuterons, with the expected 15.1-MeV photon flux to be approximately 10¹¹ s^-1 sr^-1 per 1 mA of 19.6-MeV proton current on a carbon target. A compact pulsed proton accelerator capable of 10-mA or greater peak currents to drive such a gamma source will be presented. The accelerator concept is based on a 4-rod RFQ followed by compact H-mode structures with PMQ focusing.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPWI026
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THPF148	LANSCE H⁺ RFQ Status	4073
	R.W. Garnett, Y.K. Batygin, C.A. Chapman, I.N. Draganic, C.M. Fortgang, S.S. Kurennoy, R.C. McCrady, J.F. O'Hara, E.R. Olivas, L. Rybarcyk, H.R. Salazar LANL, Los Alamos, New Mexico, USA J. Haeuser Kress GmbH, Biebergemuend, Germany B. Koubek, A. Schempp IAP, Frankfurt am Main, Germany
	Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396. The LANSCE linear accelerator at Los Alamos National Laboratory provides H⁻ and H⁺ beams to several user facilities that support Isotope Production, NNSA Stockpile Stewardship, and Basic Energy Science programs. These beams are initially accelerated to 750 keV using Cockcroft-Walton (CW) based injectors that have been in operation for over 37 years. To reduce long-term operational risks and to realize future beam performance goals for LANSCE we are completing fabrication of a 4-rod Radio-Frequency Quadrupole (RFQ) and design of an associated beam transport line that together will eventually become the modern injector replacement for the existing obsolete H⁺ injector system. A similar H⁻ system is also planned for future implementation. An update on the status and progress of the project will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF148
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THPF149	Electromagnetic Modeling of 4-Rod RFQ Tuning	4076
	S.S. Kurennoy, L. Rybarcyk LANL, Los Alamos, New Mexico, USA
	Modern codes make possible detailed 3D electromagnetic modeling of RFQ accelerators. We have recently analyzed two 201.25-MHz 4-rod RFQs – one commissioned at FNAL and a new design for LANL – with CST Studio using imported manufacturer CAD files. The RFQ electromagnetic analysis with MicroWave Studio (MWS) was followed by beam dynamics modeling with Particle Studio as well as other multi-particle codes. Here we apply a similar approach to study the process of RFQ tuning in 3D CST models. In particular, the results will be used to better understand tuning the voltage flatness along the new LANL 4-rod RFQ. S.S. Kurennoy, LINAC14, Geneva, Switzerland, 2014, THPP097.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF149
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Paper

Title

Page

Advantages to an Online Multi-particle Beam Dynamics Model for High-power Proton Linacs

1234

L. Rybarcyk, S.A. Baily, X. Pang
LANL, Los Alamos, New Mexico, USA

High-power proton linacs like the 800-MeV LANSCE accelerator typically use a physics-based approach and online single-particle and envelope beam dynamics models to establish nominal set points for operation. However, these models are not good enough to enable immediate transition to high-power operation. Instead, some amount of empirical adjustment is necessary to achieve stable, low beam-loss operation. At Los Alamos, we have been developing a new online model, which employs multiparticle beam dynamics, as a tool for providing more information and insight to the operations staff, especially during this transition to high-power operations. This presentation will discuss some of the advantages and benefits of using this type of tool in the tune-up and operation of a high-power proton linac.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWI033

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPWI026

A Monochromatic Gamma Source without Neutrons

2292

R.W. Garnett, S.S. Kurennoy, L. Rybarcyk, T.N. Taddeucci
LANL, Los Alamos, New Mexico, USA

Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396.
High-energy gamma rays can be efficiently produced using the direct excitation of the 15.1-MeV level in 12C via the (p, p’) reaction. This reaction has the threshold energy of 16.38 MeV. The threshold for neutron production via 12C (p, n) is 19.66 MeV, so there is an energy window of 3.28 MeV where the 15.1-MeV photons can be produced without any direct neutrons. Thick-target yield estimates indicate that just below the neutron production threshold, the photon output is about twice that of the more well-known 11B (d, n) reaction requiring 4-MeV deuterons, with the expected 15.1-MeV photon flux to be approximately 10¹¹ s^-1 sr^-1 per 1 mA of 19.6-MeV proton current on a carbon target. A compact pulsed proton accelerator capable of 10-mA or greater peak currents to drive such a gamma source will be presented. The accelerator concept is based on a 4-rod RFQ followed by compact H-mode structures with PMQ focusing.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPWI026

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPF148

LANSCE H⁺ RFQ Status

4073

R.W. Garnett, Y.K. Batygin, C.A. Chapman, I.N. Draganic, C.M. Fortgang, S.S. Kurennoy, R.C. McCrady, J.F. O'Hara, E.R. Olivas, L. Rybarcyk, H.R. Salazar
LANL, Los Alamos, New Mexico, USA
J. Haeuser
Kress GmbH, Biebergemuend, Germany
B. Koubek, A. Schempp
IAP, Frankfurt am Main, Germany

Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396.
The LANSCE linear accelerator at Los Alamos National Laboratory provides H⁻ and H⁺ beams to several user facilities that support Isotope Production, NNSA Stockpile Stewardship, and Basic Energy Science programs. These beams are initially accelerated to 750 keV using Cockcroft-Walton (CW) based injectors that have been in operation for over 37 years. To reduce long-term operational risks and to realize future beam performance goals for LANSCE we are completing fabrication of a 4-rod Radio-Frequency Quadrupole (RFQ) and design of an associated beam transport line that together will eventually become the modern injector replacement for the existing obsolete H⁺ injector system. A similar H⁻ system is also planned for future implementation. An update on the status and progress of the project will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF148

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPF149

Electromagnetic Modeling of 4-Rod RFQ Tuning

4076

S.S. Kurennoy, L. Rybarcyk
LANL, Los Alamos, New Mexico, USA

Modern codes make possible detailed 3D electromagnetic modeling of RFQ accelerators. We have recently analyzed two 201.25-MHz 4-rod RFQs – one commissioned at FNAL and a new design for LANL – with CST Studio using imported manufacturer CAD files*. The RFQ electromagnetic analysis with MicroWave Studio (MWS) was followed by beam dynamics modeling with Particle Studio as well as other multi-particle codes. Here we apply a similar approach to study the process of RFQ tuning in 3D CST models. In particular, the results will be used to better understand tuning the voltage flatness along the new LANL 4-rod RFQ.
* S.S. Kurennoy, LINAC14, Geneva, Switzerland, 2014, THPP097.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF149

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)