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Romanov, G.V.

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MO301 Overview of the High Intensity Neutrino Source Linac R&D Program at Fermilab 36
 
  • R.C. Webber, G. Apollinari, J.-P. Carneiro, I.G. Gonin, B.M. Hanna, S. Hays, T.N. Khabiboulline, G. Lanfranco, R.L. Madrak, A. Moretti, T.H. Nicol, T.M. Page, E. Peoples, H. Piekarz, L. Ristori, G.V. Romanov, C.W. Schmidt, J. Steimel, I. Terechkine, R.L. Wagner, D. Wildman
    Fermilab, Batavia
  • P.N. Ostroumov
    ANL, Argonne
  • W.M. Tam
    IUCF, Bloomington, Indiana
 
 

Funding: Fermilab is operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
The High Intensity Neutrino Source (HINS) linac R&D program at Fermilab aims to construct and operate a first-of-a-kind, 60 MeV, superconducting H- linac. The machine will demonstrate acceleration of high intensity beam using superconducting spoke cavities from 10 MeV, solenoidal focusing optics throughout for axially-symmetric beam to control halo growth, and operation of many cavities from a single high power rf source for acceleration of non-relativistic particles.

 

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Slides

 
MOP012 High Power Test of Room Temperature Spoke Cavities for HINS at Fermilab 79
 
  • W.M. Tam, G. Apollinari, T.N. Khabiboulline, R.L. Madrak, A. Moretti, L. Ristori, G.V. Romanov, J. Steimel, R.C. Webber, D. Wildman
    Fermilab, Batavia
  • W.M. Tam
    IUCF, Bloomington, Indiana
 
 

The High Intensity Neutrino Source (HINS) R&D program at Fermilab will build a new 65 MeV test linac to demonstrate new technologies for application in a high intensity hadron linac front-end. The HINS warm section is composed of an ion source, a radio frequency quadrupole, a medium energy beam transport and 16 room temperature Crossbar H-type (RT-CH) cavities that accelerate the beam to 10 MeV (β=0.1422). The RT-CH cavities are separated by superconducting solenoids enclosed in individual cryostats. Beyond 10 MeV, the design uses superconducting spoke resonators. In this paper, we illustrate the completion of four RT-CH cavities and explain latest modifications in the mechanical and radio frequency (RF) designs. Cavities RF measurements and tuning performed at Fermilab are also discussed. Descriptions of the HINS R&D Facility including high power RF, vacuum, cooling and low level RF systems will be given. Finally, the history of RF conditioning and the results of high power tests of RT-CH cavities will be discussed.

 
MOP041 The Fabrication and Initial Testing of the HINS RFQ 160
 
  • G. Apollinari, B.M. Hanna, T.N. Khabiboulline, A. Lunin, A. Moretti, T.M. Page, G.V. Romanov, J. Steimel, R.C. Webber, D. Wildman
    Fermilab, Batavia
  • P.N. Ostroumov
    ANL, Argonne
 
 

Fermilab is designing and building the HINS front-end test facility. The HINS proton linear accelerator consists of a normal-conducting and a superconducting section. The normal-conducting (warm) section is composed of an ion source, a 2.5 MeV radio frequency quadrupole (RFQ), a medium energy beam transport, and 16 normal-conducting crossbar H-type cavities that accelerate the beam to 10 MeV. Production of 325 MHz 4-vane RFQ is recently completed. This paper presents the design concepts for this RFQ, the mechanical design and tuning results. Issues that arose during manufacturing of the RFQ will be discussed and specific corrective modifications will be explained. The preliminary results of initial testing of RFQ at the test facility will be presented and comparisons with the former simulations will also be discussed.

 
MOP042 Complete RF Design of the HINS RFQ with CST MWS and HFSS 163
 
  • G.V. Romanov, A. Lunin
    Fermilab, Batavia
 
 

Similar to many other linear accelerators, the High Intensity Neutron Source requires an RFQ for initial acceleration and formation of the bunched beam structure. The RFQ design includes two main tasks: a) the beam dynamics design resulting in a vane tip modulation table for machining and b) the resonator electromagnetic design resulting in the final dimensions of the resonator. The focus of this paper is on the second task. We report complete and detailed rf modeling on the HINS RFQ resonator using simulating codes CST Microwave Studio (MWS) and Ansoft High Frequency Structure Simulator (HFSS). All details of the resonator such as input and output radial matchers, the end cut-backs etc. have been precisely determined. Finally in the first time a full size RFQ model with modulated vane tips and all tuners installed has been built, and a complete simulation of RFQ tuning has been performed. Comparison of the simulation results with experimental measurements demonstrated excellent agreement.

 
MOP043 Simulation of Multipacting in HINS Accelerating Structures with CST Particle Studio 166
 
  • G.V. Romanov
    Fermilab, Batavia
 
 

Recently high power tests of the room temperature cross-bar H-type resonators (CH resonators) and high gradient tests of a superconducting single spoke resonator (SSR) have been performed under the High Intensity Neutrino Source (HINS) project at Fermilab. The resonators have shown a tendency of having multipacting at various levels of input power and therefore longer processing time. To provide insights for the problem, detailed numerical simulations of multipacting for these resonators have become necessary. New generation of accelerating structures like superconducting spoke resonators and room temperature CH resonators need a full 3D treatment. Simulations and study of multipacting in the resonators have been carried out using CST Particle Studio. The problematic regions and power levels have been identified for both types of resonators. This presentation will give the result of simulations and comparison with experimental data.

 
MOP011 An 8 GeV CW Linac With High Potential Beam Power 76
 
  • M. Popovic, C.M. Ankenbrandt, A. Moretti, S. Nagaitsev, T.J. Peterson, G.V. Romanov, N. Solyak, V.P. Yakovlev, K. Yonehara
    Fermilab, Batavia
  • R.A. Baartman
    TRIUMF, Vancouver
  • I.B. Enchevich, R.P. Johnson, M.L. Neubauer
    Muons, Inc, Batavia
  • R.A. Rimmer
    JLAB, Newport News, Virginia
 
 

Modern technology allows us to consider operating an 8 GeV Linac in a cw mode to accelerate a high-current H- beam. By using appropriate accumulation rings, the linac could provide simultaneous beams for direct neutrino production, neutrino factories, fixed target experiments, and muon colliders. Several other unique accelerator applications could also be served and improved by the same continuous beam, including studies of energy production and nuclear waste reduction by transmutation, rare muon decay searches, and muon catalyzed fusion. The trade-offs between cw operation compared to pulsed operation that are considered include the maximum rf gradient and corresponding linac length or energy, the rf frequency, rf peak power and coupler requirements, and refrigeration. Methods for accumulating the beam from a cw linac to serve the special needs of the potential future Fermilab programs mentioned above are considered. In this paper we also examine the use of a cyclotron as a source of high current beams to reduce the cost and complexity of the linac front end.

 
THP030 High Gradient Test Results of 325 MHz Single Spoke Cavity at Fermilab 851
 
  • G. Apollinari, I.G. Gonin, T.N. Khabiboulline, G. Lanfranco, A. Mukherjee, J.P. Ozelis, L. Ristori, G.V. Romanov, D.A. Sergatskov, R.L. Wagner, R.C. Webber
    Fermilab, Batavia
  • J.D. Fuerst, M.P. Kelly, K.W. Shepard
    ANL, Argonne
 
 

The High Intensity Neutrino Source (HINS) project represents the current effort at Fermilab to develop 60 MeV Proton/H- Linac as a front end for possible use in the Project X. Eighteen superconducting β=0.21 single spoke resonators (SSR), operating at 325 MHz, comprise the first stage of the HINS cold section. Two SSR cavities have now been fabricated in industry under this project and undergone surface treatment that is described here. We report the results of high gradient tests of the first SSR in the Vertical Test System (VTS). The cavity successfully achieved accelerating gradient of 13.5 MV/m; higher than the design operating gradient of 10 MV/m. The history of multipacting and conditioning during the VTS tests will be discussed. Experimental measurements of the cavity mechanical and vibration properties including Lorenz force detuning and measurements of X-rays resulting from field emission are also presented.