PAC2013 - List of Authors (Olivas, E.R.)

Paper	Title	Page
MOPMA16	Design Analysis of the New LANL 4-Rod RFQ	333
	S.S. Kurennoy, E.R. Olivas, L. Rybarcyk LANL, Los Alamos, New Mexico, USA
	An upgraded front end of the LANSCE linac will include a 4-rod RFQ replacing the aging Cockcroft-Walton injector, initially only for protons. We performed a detailed analysis of the proposed RFQ design using 3D modeling with the CST Studio Suite. The CAD-based RFQ model takes all design details into account. The electromagnetic analysis with MicroWave Studio (MWS) is followed by beam dynamics modeling with Particle Studio (PS) using the MWS-calculated fields. In addition, a thermal and stress analysis is performed with ANSYS, based on the power flux from MWS computations. Simulation results are used for design iterations aimed to satisfy special requirements imposed by an existing common transfer line for different beams injected into the 201.25-MHz drift-tube linac.

MOPSM05	Diagnostics for the LANSCE RFQ Front-End Test Stand	354
	R.C. McCrady, Y.K. Batygin, I. Draganić, C.M. Fortgang, R.W. Garnett, S.S. Kurennoy, J.F. O'Hara, E.R. Olivas, L. Rybarcyk LANL, Los Alamos, New Mexico, USA
	Plans are underway at the Los Alamos Neutron Science Center to replace the existing H⁺ Cockcroft-Walton injector with a modern 4-rod Radio-Frequency Quadrupole (RFQ) based front end. This will provide protons for injection into the downstream linac, where H⁻ ions are also accelerated. This dual-species operation of the linac imposes constraints on the injectors, resulting in particular requirements on the transverse and longitudinal emittances and phase-space distributions of the beam from the RFQ proton injector. Good measurements of these quantities are therefore required during the testing phase of the RFQ injector. In this paper we describe the measurements to be made and plans for the systems for carrying out the measurements.

WEPAC33	Results of the New High Power Tests of Superconducting Photonic Band Gap Structure Cells	850
	E.I. Simakov, S. Arsenyev, W.B. Haynes, S.S. Kurennoy, D. C. Lizon, J.F. O'Hara, E.R. Olivas, D.Y. Shchegolkov, N.A. Suvorova, T. Tajima LANL, Los Alamos, New Mexico, USA S. Arsenyev MIT/PSFC, Cambridge, Massachusetts, USA C.H. Boulware, T.L. Grimm Niowave, Inc., Lansing, Michigan, USA
	Funding: This work is supported by the Department of Defense High Energy Laser Joint Technology Office through the Office of Naval Research. We present an update on the 2.1 GHz superconducting rf (SRF) photonic band gap (PBG) resonator experiment in Los Alamos. The new SRF PBG cell was designed with the particular emphasis on changing the shape of PBG rods to reduce the peak magnetic fields and at the same time to preserve its effectiveness for suppression of the higher order modes (HOMs). The new PBG cells have great potential for outcoupling long-range wakefields in SRF accelerator structures without affecting the fundamental accelerating mode. Using PBG structures in superconducting particle accelerators will allow operation at higher frequencies and moving forward to significantly higher beam luminosities thus leading towards a completely new generation of colliders for high energy physics. Here we report the results of our efforts to fabricate 2.1 GHz PBG cells with elliptical rods and to test them with high power in a liquid helium bath at the temperature of 2 Kelvin. The high gradient performance of the cells will be evaluated and the results will be compared to electromagnetic and thermal simulations.

Paper

Title

Page

Design Analysis of the New LANL 4-Rod RFQ

333

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

An upgraded front end of the LANSCE linac will include a 4-rod RFQ replacing the aging Cockcroft-Walton injector, initially only for protons. We performed a detailed analysis of the proposed RFQ design using 3D modeling with the CST Studio Suite. The CAD-based RFQ model takes all design details into account. The electromagnetic analysis with MicroWave Studio (MWS) is followed by beam dynamics modeling with Particle Studio (PS) using the MWS-calculated fields. In addition, a thermal and stress analysis is performed with ANSYS, based on the power flux from MWS computations. Simulation results are used for design iterations aimed to satisfy special requirements imposed by an existing common transfer line for different beams injected into the 201.25-MHz drift-tube linac.

MOPSM05

Diagnostics for the LANSCE RFQ Front-End Test Stand

354

R.C. McCrady, Y.K. Batygin, I. Draganić, C.M. Fortgang, R.W. Garnett, S.S. Kurennoy, J.F. O'Hara, E.R. Olivas, L. Rybarcyk
LANL, Los Alamos, New Mexico, USA

Plans are underway at the Los Alamos Neutron Science Center to replace the existing H⁺ Cockcroft-Walton injector with a modern 4-rod Radio-Frequency Quadrupole (RFQ) based front end. This will provide protons for injection into the downstream linac, where H⁻ ions are also accelerated. This dual-species operation of the linac imposes constraints on the injectors, resulting in particular requirements on the transverse and longitudinal emittances and phase-space distributions of the beam from the RFQ proton injector. Good measurements of these quantities are therefore required during the testing phase of the RFQ injector. In this paper we describe the measurements to be made and plans for the systems for carrying out the measurements.

WEPAC33

Results of the New High Power Tests of Superconducting Photonic Band Gap Structure Cells

850

E.I. Simakov, S. Arsenyev, W.B. Haynes, S.S. Kurennoy, D. C. Lizon, J.F. O'Hara, E.R. Olivas, D.Y. Shchegolkov, N.A. Suvorova, T. Tajima
LANL, Los Alamos, New Mexico, USA
S. Arsenyev
MIT/PSFC, Cambridge, Massachusetts, USA
C.H. Boulware, T.L. Grimm
Niowave, Inc., Lansing, Michigan, USA

Funding: This work is supported by the Department of Defense High Energy Laser Joint Technology Office through the Office of Naval Research.
We present an update on the 2.1 GHz superconducting rf (SRF) photonic band gap (PBG) resonator experiment in Los Alamos. The new SRF PBG cell was designed with the particular emphasis on changing the shape of PBG rods to reduce the peak magnetic fields and at the same time to preserve its effectiveness for suppression of the higher order modes (HOMs). The new PBG cells have great potential for outcoupling long-range wakefields in SRF accelerator structures without affecting the fundamental accelerating mode. Using PBG structures in superconducting particle accelerators will allow operation at higher frequencies and moving forward to significantly higher beam luminosities thus leading towards a completely new generation of colliders for high energy physics. Here we report the results of our efforts to fabricate 2.1 GHz PBG cells with elliptical rods and to test them with high power in a liquid helium bath at the temperature of 2 Kelvin. The high gradient performance of the cells will be evaluated and the results will be compared to electromagnetic and thermal simulations.