SRF2011 - List of Authors (Ginsburg, C.M.)

Paper

Title

Page

650 MHz Cryomodules for Project X at Fermilab – Requirements and Concepts

34

T.J. Peterson, M.H. Foley, C.M. Ginsburg, C.J. Grimm, J.S. Kerby, Y. Orlov
Fermilab, Batavia, USA
R. Ghosh, G. Gilankar, A. Jain, P. Khare, P.K. Kush, A. Laxminarayanan
RRCAT, Indore (M.P.), India

Cryomodules containing 650 MHz superconducting niobium RF cavities and associated components (input couplers, tuners, instrumentation, etc.) will be developed for Project X, a proposed high intensity proton accelerator facility based on an H⁻ linear accelerator at Fermilab. This paper describes the requirements of the 650 MHz cryomodules and the implications of those requirements for the cryomodule design. Cryomodule string segmentation, integration with the cryogenic system, features for maintainability and access, piping and emergency venting considerations, pressure vessel issues, and thermal and mechanical design concepts will be described.

Poster MOPO003 [0.788 MB]

MOPO024

Design of Single Spoke Resonators for Project X

122

L. Ristori, S. Barbanotti, P. Berrutti, M.S. Champion, M.H. Foley, C.M. Ginsburg, I.G. Gonin, C.J. Grimm, T.N. Khabiboulline, D. Passarelli, N. Solyak, A. Vostrikov, 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.
Project X is based on a 3 GeV CW superconducting linac and is currently in the R&D phase awaiting CD-0 approval. The low-energy section of the Project X H⁻ linac (starting at 2.5 MeV) includes three types of super-conducting single spoke cavities operating at 325 MHz. The first three cryomodules will each house 7 SSR0 cavities at β = 0.11. The following two cryomodules will each contain 10 SSR1 cavities each at β = 0.21. The last four cryomodules will contain 11 SSR2 cavities each at β = 0.4. Single spoke cavities were selected for the linac in virtue of their higher r/Q values compared to standard Half Wave Resonator. Quarter Wave Resonators were not considered for such a high frequency. In this paper we present the decisions and analyses that lead to the final design of SSR0. Electro-magnetic and mechanical finite element analyses were performed with the purpose of optimizing the electro-magnetic design, minimizing frequency shifts due to helium bath pressure fluctuations and providing a pressure rating for the resonators that allow their use in the cryomodules.

THIOB01

Project X Cavity and Cryomodule Development

663

C.M. Ginsburg, M.S. Champion
Fermilab, Batavia, USA

Funding: Work supported in part by the U.S. Department of Energy under Contract No. DE-AC02-07CH11359.
Project X is a proposed multi-MW proton accelerator facility based on an H⁻ linear accelerator using SRF technology at Fermilab. The Project X 3-GeV CW linac requires the development of two families of SRF cavities at 325 and 650 MHz, to accelerate 1 mA of average H⁻ beam current in the energy range 2.5-160 MeV, and 160-3000 MeV, respectively. The cavities must support possible acceleration of up to 4 mA beam current. The baseline design calls for three types of SRF single-spoke resonators at 325 MHz having betas of 0.11, 0.22, and 0.42, and two types of SRF five-cell elliptical cavities having betas of 0.61 and 0.9. The electromagnetic and mechanical cavity designs are well underway and prototype tests for some cavity designs have started. Due to CW operation, the heat load on the cryogenic system is substantial; and for purposes of cryogenic system design, the dynamic heat load is limited to 250 W at 2K per cryomodule. The anticipated heat loads for the 650 MHz section lead to stringent requirements on cavity unloaded quality factor Q0, and on cryogenic aspects of the cryomodule design. Status and plans for the Project X cavity and cryomodule development will be described.

Slides THIOB01 [2.432 MB]

Paper	Title	Page
MOPO003	650 MHz Cryomodules for Project X at Fermilab – Requirements and Concepts	34
	T.J. Peterson, M.H. Foley, C.M. Ginsburg, C.J. Grimm, J.S. Kerby, Y. Orlov Fermilab, Batavia, USA R. Ghosh, G. Gilankar, A. Jain, P. Khare, P.K. Kush, A. Laxminarayanan RRCAT, Indore (M.P.), India
	Cryomodules containing 650 MHz superconducting niobium RF cavities and associated components (input couplers, tuners, instrumentation, etc.) will be developed for Project X, a proposed high intensity proton accelerator facility based on an H⁻ linear accelerator at Fermilab. This paper describes the requirements of the 650 MHz cryomodules and the implications of those requirements for the cryomodule design. Cryomodule string segmentation, integration with the cryogenic system, features for maintainability and access, piping and emergency venting considerations, pressure vessel issues, and thermal and mechanical design concepts will be described.
	Poster MOPO003 [0.788 MB]

MOPO024	Design of Single Spoke Resonators for Project X	122
	L. Ristori, S. Barbanotti, P. Berrutti, M.S. Champion, M.H. Foley, C.M. Ginsburg, I.G. Gonin, C.J. Grimm, T.N. Khabiboulline, D. Passarelli, N. Solyak, A. Vostrikov, 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. Project X is based on a 3 GeV CW superconducting linac and is currently in the R&D phase awaiting CD-0 approval. The low-energy section of the Project X H⁻ linac (starting at 2.5 MeV) includes three types of super-conducting single spoke cavities operating at 325 MHz. The first three cryomodules will each house 7 SSR0 cavities at β = 0.11. The following two cryomodules will each contain 10 SSR1 cavities each at β = 0.21. The last four cryomodules will contain 11 SSR2 cavities each at β = 0.4. Single spoke cavities were selected for the linac in virtue of their higher r/Q values compared to standard Half Wave Resonator. Quarter Wave Resonators were not considered for such a high frequency. In this paper we present the decisions and analyses that lead to the final design of SSR0. Electro-magnetic and mechanical finite element analyses were performed with the purpose of optimizing the electro-magnetic design, minimizing frequency shifts due to helium bath pressure fluctuations and providing a pressure rating for the resonators that allow their use in the cryomodules.

THIOB01	Project X Cavity and Cryomodule Development	663
	C.M. Ginsburg, M.S. Champion Fermilab, Batavia, USA
	Funding: Work supported in part by the U.S. Department of Energy under Contract No. DE-AC02-07CH11359. Project X is a proposed multi-MW proton accelerator facility based on an H⁻ linear accelerator using SRF technology at Fermilab. The Project X 3-GeV CW linac requires the development of two families of SRF cavities at 325 and 650 MHz, to accelerate 1 mA of average H⁻ beam current in the energy range 2.5-160 MeV, and 160-3000 MeV, respectively. The cavities must support possible acceleration of up to 4 mA beam current. The baseline design calls for three types of SRF single-spoke resonators at 325 MHz having betas of 0.11, 0.22, and 0.42, and two types of SRF five-cell elliptical cavities having betas of 0.61 and 0.9. The electromagnetic and mechanical cavity designs are well underway and prototype tests for some cavity designs have started. Due to CW operation, the heat load on the cryogenic system is substantial; and for purposes of cryogenic system design, the dynamic heat load is limited to 250 W at 2K per cryomodule. The anticipated heat loads for the 650 MHz section lead to stringent requirements on cavity unloaded quality factor Q0, and on cryogenic aspects of the cryomodule design. Status and plans for the Project X cavity and cryomodule development will be described.
	Slides THIOB01 [2.432 MB]