SRF2017 - Table of Session: FRXAA (Technology-CM II)

Paper	Title	Page
FRXAA01	Production Status of Superconducting Cryomodules for the Facility for Rare Isotope Beams	928
	C. Compton, H. Ao, J. Asciutto, B. Bird, W. Hartung, S.J. Miller, J.T. Popielarski, L. Popielarski, M.A. Reaume, K. Saito, M. Shuptar, S. Stark, B.P. Tousignant, T. Xu FRIB, East Lansing, USA
	The Facility for Rare Isotope Beams (FRIB) is an SRF accelerator project in full production at Michigan State University (MSU). With the civil construction nearly complete, the installation of accelerator equipment into the tunnel has taken center stage. A total of 46 superconducting cryomodules are needed for the FRIB linac to reach 200 MeV per nucleon. The linac consist of four cavity types (β = 0.041, 0.085, 0.29, and 0.53) and 6 different cryomodule designs. Cryomodule assembly is done in 5 parallel bays, each one compatible with every cryomodule type. Completed cryomodules undergo full system testing in bunkers before being accepted and delivered to the tunnel. The current status of the cryomodule assembly effort will be presented, including lessons learned and overall experience to date.
	Slides FRXAA01 [9.990 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-FRXAA01
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FRXAA02	High-efficiency, High-current Optimized Main-linac ERL Cryomodule	935
	F. Furuta, N. Banerjee, A.C. Bartnik, J. Dobbins, R.G. Eichhorn, M. Ge, G.H. Hoffstaetter, M. Liepe, P. Quigley, D.M. Sabol, J. Sears, E.N. Smith, V. Veshcherevich Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
	The Main Linac Cryomodule (MLC) prototype is a key component of the Cornell-BNL ERL Test Accelerator (CBETA) project, which is a 4-turn FFAG ERL currently under construction at Cornell University. This novel cryomodule is the first SRF module ever to be fully optimized simultaneously for high efficient SRF cavity operation and for supporting very high CW beam currents. After a successful initial MLC testing, the MLC has now been moved into its final location for the CBETA ring. For a first beam test of the MLC and CBETA, the Cornell ERL high voltage DC gun and SRF injector cryomodule were connected to MLC via an entry beam line; a beam stop assembly was also installed at the exit line. In this paper, we summarize the performance of this novel ERL cryomodule including the results of the first beam test and the additional tests focused on RF field stability and cavity microphonics.
	Slides FRXAA02 [8.792 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-FRXAA02
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FRXAA03	Performance of the High Q CW Prototype Cryomodule for LCLS-II at FNAL
	G. Wu, A. Grassellino, E.R. Harms, N. Solyak Fermilab, Batavia, Illinois, USA
	Funding: Work is supported under Contract No. De-AC02-07CH11359 with the United States Department of Energy. Continuous wave (CW) operation of LCLS-II cryomodules require substantial design changes to previously designed 1.3 GHz ILC type cryomodule. The new design uses innovative nitrogen doped cavities together with a helium vessel that provides high thermal gradient on the cavities during a fast cool down. Magnetic shielding uses two layers outside of helium vessel and a single layer that completely encapsulates the end groups except the beam apertures. Sophisticated magnetic hygiene includes vacuum vessel demagnetization, magnetic screening of the components and final demagnetization to the assembled cryomodule. Fermilab successfully assembled a preproduction LCLS-II cryomodule that achieved unprecedented cavity quality factors of 3.0·10¹⁰ at a nominal cryomodule voltage. The ambient fields in the cavities were near zero. This article describes historic cavity performance under various cool down parameters. Cavity performance retained very well compared to that of vertical tests.
	Slides FRXAA03 [3.700 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Production Status of Superconducting Cryomodules for the Facility for Rare Isotope Beams

928

C. Compton, H. Ao, J. Asciutto, B. Bird, W. Hartung, S.J. Miller, J.T. Popielarski, L. Popielarski, M.A. Reaume, K. Saito, M. Shuptar, S. Stark, B.P. Tousignant, T. Xu
FRIB, East Lansing, USA

The Facility for Rare Isotope Beams (FRIB) is an SRF accelerator project in full production at Michigan State University (MSU). With the civil construction nearly complete, the installation of accelerator equipment into the tunnel has taken center stage. A total of 46 superconducting cryomodules are needed for the FRIB linac to reach 200 MeV per nucleon. The linac consist of four cavity types (β = 0.041, 0.085, 0.29, and 0.53) and 6 different cryomodule designs. Cryomodule assembly is done in 5 parallel bays, each one compatible with every cryomodule type. Completed cryomodules undergo full system testing in bunkers before being accepted and delivered to the tunnel. The current status of the cryomodule assembly effort will be presented, including lessons learned and overall experience to date.

Slides FRXAA01 [9.990 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-FRXAA01

Export •

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

FRXAA02

High-efficiency, High-current Optimized Main-linac ERL Cryomodule

935

F. Furuta, N. Banerjee, A.C. Bartnik, J. Dobbins, R.G. Eichhorn, M. Ge, G.H. Hoffstaetter, M. Liepe, P. Quigley, D.M. Sabol, J. Sears, E.N. Smith, V. Veshcherevich
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA

The Main Linac Cryomodule (MLC) prototype is a key component of the Cornell-BNL ERL Test Accelerator (CBETA) project, which is a 4-turn FFAG ERL currently under construction at Cornell University. This novel cryomodule is the first SRF module ever to be fully optimized simultaneously for high efficient SRF cavity operation and for supporting very high CW beam currents. After a successful initial MLC testing, the MLC has now been moved into its final location for the CBETA ring. For a first beam test of the MLC and CBETA, the Cornell ERL high voltage DC gun and SRF injector cryomodule were connected to MLC via an entry beam line; a beam stop assembly was also installed at the exit line. In this paper, we summarize the performance of this novel ERL cryomodule including the results of the first beam test and the additional tests focused on RF field stability and cavity microphonics.

Slides FRXAA02 [8.792 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-FRXAA02

Export •

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

FRXAA03

Performance of the High Q CW Prototype Cryomodule for LCLS-II at FNAL

G. Wu, A. Grassellino, E.R. Harms, N. Solyak
Fermilab, Batavia, Illinois, USA

Funding: Work is supported under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
Continuous wave (CW) operation of LCLS-II cryomodules require substantial design changes to previously designed 1.3 GHz ILC type cryomodule. The new design uses innovative nitrogen doped cavities together with a helium vessel that provides high thermal gradient on the cavities during a fast cool down. Magnetic shielding uses two layers outside of helium vessel and a single layer that completely encapsulates the end groups except the beam apertures. Sophisticated magnetic hygiene includes vacuum vessel demagnetization, magnetic screening of the components and final demagnetization to the assembled cryomodule. Fermilab successfully assembled a preproduction LCLS-II cryomodule that achieved unprecedented cavity quality factors of 3.0·10¹⁰ at a nominal cryomodule voltage. The ambient fields in the cavities were near zero. This article describes historic cavity performance under various cool down parameters. Cavity performance retained very well compared to that of vertical tests.

Slides FRXAA03 [3.700 MB]

Export •

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