IPAC2013 - List of Authors (Khabiboulline, T.N.)

Paper	Title	Page
WEPWO053	SRF Development for a MW Proton Source at Fermi National Accelerator Laboratory	2423
	T.T. Arkan, C.M. Ginsburg, A. Grassellino, S. Kazakov, T.N. Khabiboulline, T.H. Nicol, Y. Orlov, T.J. Peterson, L. Ristori, A. Romanenko, A.M. Rowe, N. Solyak, A.I. Sukhanov, V.P. Yakovlev Fermilab, Batavia, USA
	Funding: Work supported by the US Department of Energy Fermilab is planning a megawatt-level proton beam facility utilizing niobium superconducting RF (SRF) cavities. Project X at Fermilab will eventually provide high-intensity beams for research into the nature of matter at the "intensity frontier". Research and development in several areas will bring the SRF technology to the level needed for this application. Among developments in SRF being pursued with our national and international collaborators are 162.5 MHz half-wave resonators, 325 MHz single-spoke resonators, and two types of elliptical multi-cell 650 MHz cavities. Performance requirements for these cavities and cryomodules in continuous wave (CW) operation are extremely stringent in order to provide high accelerating gradients with acceptable total cryogenic load and overall accelerator capital and operating costs. This paper presents some highlights of the SRF R&D program and proton linac development work at Fermilab.

WEPWO055	Fabrication and Testing of SSR1 Resonators for PXIE	2429
	L. Ristori, M.H. Awida, P. Berrutti, T.N. Khabiboulline, M. Merio, D. Passarelli, A.M. Rowe, D.A. Sergatskov, A.I. Sukhanov Fermilab, Batavia, USA
	Fermilab is in the process of constructing a proton linac to accelerate a 1 mA CW beam up to 30 MeV. It will be a test for the front end of Project X and known as the Project X Injector Experiment (PXIE). The major goal of PXIE is the validation of the Project X concept and mitigation of technical risks. It is expected to be constructed in the period of 2012-2016. The PXIE linac consists of a Ion source and LEBT, a 162.5 MHz RFQ, a MEBT, a 162.5 MHz HWR cryomodule (designed and built at ANL) and a 325 MHZ SSR1 cryomodule (designed and built at FNAL). In this paper we present the recent advances in the development of the SSR1 resonators at Fermilab. Several bare SSR1 resonators have been processed, heat-treated and tested successfully in the Fermilab Vertical Test Stand. The outfitting of helium vessels is in process and the coarse-fine frequency tuning system has been designed and is currently being procured and tested. Details of the power coupler are also discussed.

WEPWO056	Update of the Mechanical Design of the 650 MHZ β=0.9 Cavities for Project X	2432
	I.V. Gonin, M.H. Awida, M.H. Foley, C.J. Grimm, T.N. Khabiboulline, Y.M. Pischalnikov, V.P. Yakovlev Fermilab, Batavia, USA
	Five-cell elliptical 650 MHz β=0.9 cavities to accelerate 1 mA of average H⁻ beam current in the range 520-3000 MeV of the Project X Linac are currently planned. We will present the results of optimization of mechanical design of cavities with their Helium Vessel. We discuss the efforts to optimize the mechanical stability of the cavity versus the Helium bath pressure fluctuations, cavity tunability. We present also modal and thermal analysis; discuss tuner options and other issues.

WEPWO057	Update of SSR2 Cavities Design for Project X and RISP	2435
	M. Merio, M.H. Awida, P. Berrutti, I.V. Gonin, T.N. Khabiboulline, D. Passarelli, Y.M. Pischalnikov, L. Ristori, N. Solyak, V.P. Yakovlev Fermilab, Batavia, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. Single spoke resonators SSR2 (f=325 MHz) are under development at Fermilab. These cavities can meet requirements of Project X (FNAL) and RISP (Korea). The initial design of SSR2 cavities has been modified and optimized in order to satisfy the necessities of both projects. This paper will discuss the RF optimization for a single spoke resonator with a 50 mm beam pipe aperture and an optimal beta of 0.51. Further, the approach to the mechanical design of the cavity will be presented together with the proposed helium vessel. The latter is intended to guarantee a low He pressure sensitivity df/dp of the entire jacketed SSR2 and actively control the microphonics.

WEPFI070	Design of RFQ Coupler for PXIE Project	2854
	S. Kazakov, T.N. Khabiboulline, V. Poloubotko, O. Pronitchev, V.P. Yakovlev Fermilab, Batavia, USA
	Design of new coupler for PXIE RFQ is reported. Two couplers are supposed to deliver ~ 100 kW total CW RF power to RFQ at 162.5 MHz. Coupler has a magnetic loop coupling with the RFQ. Nevertheless it allows to apply a HV bias to suppress a multipactor due to original design of the coupling loop. Results of RF, multipactor and thermal simulations are presented.

THPWO092	Update of Beam Optics and SRF Cavities for Project X	3975
	T.N. Khabiboulline, P. Berrutti, V.A. Lebedev, A. Lunin, T.H. Nicol, J.-F. Ostiguy, T.J. Peterson, L. Ristori, A. Saini, N. Solyak, V.P. Yakovlev Fermilab, Batavia, USA
	The Project X staging [1] requires reconsideration of the beam optics and thus, the SRF system for the 3 GeV CW linac of the Project X. The revised beam optics is presented in the paper as well as revised cavity design for SSR2 section and a new concept of the linac segmentation. The new versions for the Project X cryo-modules for the SSR2 section, low-beta 650 MHz section and high-beta 650 MHz section are discussed. The beam extraction scheme at 1 GeV is discussed also. [1] S. Holmes, “Project X News, Strategy, Meeting Goals,” 2012 Fall Project X Collaboration Meeting, 27-28 November 2012, Fermilab.

Paper

Title

Page

SRF Development for a MW Proton Source at Fermi National Accelerator Laboratory

2423

T.T. Arkan, C.M. Ginsburg, A. Grassellino, S. Kazakov, T.N. Khabiboulline, T.H. Nicol, Y. Orlov, T.J. Peterson, L. Ristori, A. Romanenko, A.M. Rowe, N. Solyak, A.I. Sukhanov, V.P. Yakovlev
Fermilab, Batavia, USA

Funding: Work supported by the US Department of Energy
Fermilab is planning a megawatt-level proton beam facility utilizing niobium superconducting RF (SRF) cavities. Project X at Fermilab will eventually provide high-intensity beams for research into the nature of matter at the "intensity frontier". Research and development in several areas will bring the SRF technology to the level needed for this application. Among developments in SRF being pursued with our national and international collaborators are 162.5 MHz half-wave resonators, 325 MHz single-spoke resonators, and two types of elliptical multi-cell 650 MHz cavities. Performance requirements for these cavities and cryomodules in continuous wave (CW) operation are extremely stringent in order to provide high accelerating gradients with acceptable total cryogenic load and overall accelerator capital and operating costs. This paper presents some highlights of the SRF R&D program and proton linac development work at Fermilab.

WEPWO055

Fabrication and Testing of SSR1 Resonators for PXIE

2429

L. Ristori, M.H. Awida, P. Berrutti, T.N. Khabiboulline, M. Merio, D. Passarelli, A.M. Rowe, D.A. Sergatskov, A.I. Sukhanov
Fermilab, Batavia, USA

Fermilab is in the process of constructing a proton linac to accelerate a 1 mA CW beam up to 30 MeV. It will be a test for the front end of Project X and known as the Project X Injector Experiment (PXIE). The major goal of PXIE is the validation of the Project X concept and mitigation of technical risks. It is expected to be constructed in the period of 2012-2016. The PXIE linac consists of a Ion source and LEBT, a 162.5 MHz RFQ, a MEBT, a 162.5 MHz HWR cryomodule (designed and built at ANL) and a 325 MHZ SSR1 cryomodule (designed and built at FNAL). In this paper we present the recent advances in the development of the SSR1 resonators at Fermilab. Several bare SSR1 resonators have been processed, heat-treated and tested successfully in the Fermilab Vertical Test Stand. The outfitting of helium vessels is in process and the coarse-fine frequency tuning system has been designed and is currently being procured and tested. Details of the power coupler are also discussed.

WEPWO056

Update of the Mechanical Design of the 650 MHZ β=0.9 Cavities for Project X

2432

I.V. Gonin, M.H. Awida, M.H. Foley, C.J. Grimm, T.N. Khabiboulline, Y.M. Pischalnikov, V.P. Yakovlev
Fermilab, Batavia, USA

Five-cell elliptical 650 MHz β=0.9 cavities to accelerate 1 mA of average H⁻ beam current in the range 520-3000 MeV of the Project X Linac are currently planned. We will present the results of optimization of mechanical design of cavities with their Helium Vessel. We discuss the efforts to optimize the mechanical stability of the cavity versus the Helium bath pressure fluctuations, cavity tunability. We present also modal and thermal analysis; discuss tuner options and other issues.

WEPWO057

Update of SSR2 Cavities Design for Project X and RISP

2435

M. Merio, M.H. Awida, P. Berrutti, I.V. Gonin, T.N. Khabiboulline, D. Passarelli, Y.M. Pischalnikov, L. Ristori, N. Solyak, V.P. Yakovlev
Fermilab, Batavia, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
Single spoke resonators SSR2 (f=325 MHz) are under development at Fermilab. These cavities can meet requirements of Project X (FNAL) and RISP (Korea). The initial design of SSR2 cavities has been modified and optimized in order to satisfy the necessities of both projects. This paper will discuss the RF optimization for a single spoke resonator with a 50 mm beam pipe aperture and an optimal beta of 0.51. Further, the approach to the mechanical design of the cavity will be presented together with the proposed helium vessel. The latter is intended to guarantee a low He pressure sensitivity df/dp of the entire jacketed SSR2 and actively control the microphonics.

WEPFI070

Design of RFQ Coupler for PXIE Project

2854

S. Kazakov, T.N. Khabiboulline, V. Poloubotko, O. Pronitchev, V.P. Yakovlev
Fermilab, Batavia, USA

Design of new coupler for PXIE RFQ is reported. Two couplers are supposed to deliver ~ 100 kW total CW RF power to RFQ at 162.5 MHz. Coupler has a magnetic loop coupling with the RFQ. Nevertheless it allows to apply a HV bias to suppress a multipactor due to original design of the coupling loop. Results of RF, multipactor and thermal simulations are presented.

THPWO092

Update of Beam Optics and SRF Cavities for Project X

3975

T.N. Khabiboulline, P. Berrutti, V.A. Lebedev, A. Lunin, T.H. Nicol, J.-F. Ostiguy, T.J. Peterson, L. Ristori, A. Saini, N. Solyak, V.P. Yakovlev
Fermilab, Batavia, USA

The Project X staging [1] requires reconsideration of the beam optics and thus, the SRF system for the 3 GeV CW linac of the Project X. The revised beam optics is presented in the paper as well as revised cavity design for SSR2 section and a new concept of the linac segmentation. The new versions for the Project X cryo-modules for the SSR2 section, low-beta 650 MHz section and high-beta 650 MHz section are discussed. The beam extraction scheme at 1 GeV is discussed also. [1] S. Holmes, “Project X News, Strategy, Meeting Goals,” 2012 Fall Project X Collaboration Meeting, 27-28 November 2012, Fermilab.