SRF2011 - List of Authors (Champion, M.S.)

Paper

Title

Page

SRF Development for High Energy Physics

20

M.S. Champion
Fermilab, Batavia, USA

Funding: Supported by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
Superconducting Radio-Frequency (SRF) technology has become the technology of choice for accelerator-based high energy physics (HEP) research, from the operating Large Hadron Collider to the planned Project X and International Linear Collider. The HEP community has made large investments in recent years in preparation for the construction of a SRF-based project, and the SRF community has grown commensurately. Results and ongoing efforts will be described along with some comparison to the application of SRF technology in non-HEP applications.

Slides MOIOB01 [3.348 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.

TUPO006

High Power Couplers for the Project X Linac

361

S. Kazakov, M.S. Champion, S. Cheban, T.N. Khabiboulline, M. Kramp, Y. Orlov, O. Pronitchev, V.P. Yakovlev
Fermilab, Batavia, USA

Project X, a multi-megawatt proton source under development at Fermi National Accelerator Laboratory. [1]. The key element of the project is a superconducting (SC) 3GV continuous wave (CW) proton linac. The linac includes 5 types of SC accelerating cavities of two frequencies.(325 and 650MHz) The cavities consume up to 30 kW average RF power and need proper main couplers. Requirements and approach to the coupler design are discussed in the report. Results of electrodynamics and thermal simulations are presented. New cost effective schemes are described.

TUPO025

Integrated Cavity Processing Apparatus at Fermilab: SRF Cavity Processing R&D

424

C.A. Cooper, M.S. Champion, L.D. Cooley, V. Poloubotko, O. Pronitchev, A.M. Rowe, M. Wong
Fermilab, Batavia, USA

A center for cavity processing R&D at Fermilab, called the Integrated Cavity Processing Apparatus, is currently in the final stages of installation and commissioning. This facility contains centrifugal barrel polishing, a horizontal electropolishing tool, a 1000°C vacuum furnace, a high pressure rinse tool utilizing ultrapure water, ISO class 4, 5 and 6 clean rooms for cavity assembly work and various other associated pieces of support equipment. All the operations are designed for single cell and nine cell 1.3 GHz Tesla type cavities except for the electropolishing tool which will initially be only for single cell use. Upgrades are currently being examined for single and five cell 650 MHz cavities. The current status of the facility and plans for future work are discussed.

TUPO028

Qualification of the Second Batch Production 9-Cell Cavities Manufactured by AES and Validation of the First US Industrial Cavity Vendor for ILC

433

R.L. Geng, D. Forehand, B.A. Golden, P. Kushnick, R.B. Overton
JLAB, Newport News, Virginia, USA
M. Calderaro, E. Peterson, J. Rathke
AES, Medford, NY, USA
M.S. Champion, J. Follkie
Fermilab, Batavia, USA
A.C. Crawford
CLASSE, Ithaca, New York, USA

Funding: This work was authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177
One of the major goals of ILC SRF cavity R&D is to develop industrial capabilities of cavity manufacture and processing in all three regions. In the past several years, Jefferson Lab, in collaboration with Fermi National Accelerator Laboratory, has processed and tested all the 9-cell cavities of the first batch (4 cavities) and second batch (6 cavities) production cavities manufactured by Advanced Energy Systems Inc. (AES). Over the course, close information feedback was maintained, resulting in changes in fabrication and processing procedures. A light buffered chemical polishing was introduced, removing the weld splatters that could not be effectively removed by heavy EP alone. An 800 Celsius 2 hour vacuum furnace heat treatment procedure replaced the original 600 Celsius 10 hour procedure. Four out of the six 9-cell cavities of the second production bath achieved a gradient of 36-41 MV/m at a Q0 of more than 8·10⁹ at 35 MV/m. This result validated AES as the first “ILC certified” industrial vendor in the US for ILC cavity manufacture.

TUPO042

SLAC/FNAL TTF3 Coupler Assembly and Processing Experience

476

C. Adolphsen, A.A. Haase, C.D. Nantista, J. Tice, F. Wang
SLAC, Menlo Park, California, USA
T.T. Arkan, M.S. Champion, S. Kazakov, A. Lunin, K.S. Premo
Fermilab, Batavia, USA

Funding: Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515
The TTF3-style coupler is typically used to power 1.3 GHz TESLA-type superconducting cavities. For the US ILC program, parts purchased in industry for such couplers are received at SLAC where they are inspected, cleaned, assembled as pairs in a Class 10 cleanroom, pumped down, baked at 150 degC and rf processed. The pairs are then shipped to FNAL and installed in cavities that are then tested at input power levels up to 300 kW. This paper describes the coupler results to date including improvements to the procedures and efforts to mitigate problems that have been encountered. Also progress on building a cold coupler section without e-beam wielding is presented.

Poster TUPO042 [0.712 MB]

THIOA01

Test Results of the International S1-Global Cryomodule

615

Y. Yamamoto, M. Akemoto, S. Fukuda, K. Hara, H. Hayano, N. Higashi, E. Kako, H. Katagiri, Y. Kojima, Y. Kondo, T. Matsumoto, H. Matsushita, S. Michizono, T. Miura, H. Nakai, H. Nakajima, K. Nakanishi, S. Noguchi, N. Ohuchi, T. Saeki, M. Satoh, T. Shidara, T. Shishido, T. Takenaka, A. Terashima, N. Toge, K. Tsuchiya, K. Watanabe, S. Yamaguchi, A. Yamamoto, K. Yokoya, M. Yoshida
KEK, Ibaraki, Japan
C. Adolphsen, C.D. Nantista
SLAC, Menlo Park, California, USA
T.T. Arkan, S. Barbanotti, M.A. Battistoni, H. Carter, M.S. Champion, A. Hocker, R.D. Kephart, J.S. Kerby, D.V. Mitchell, T.J. Peterson, Y.M. Pischalnikov, M.C. Ross, W. Schappert, B.E. Smith
Fermilab, Batavia, USA
A. Bosotti, C. Pagani, R. Paparella, P. Pierini
INFN/LASA, Segrate (MI), Italy
K. Jensch, D. Kostin, L. Lilje, A. Matheisen, W.-D. Möller, P. Schilling, M. Schmökel, N.J. Walker, H. Weise
DESY, Hamburg, Germany

S1-Global collaborative project by joint efforts of INFN, DESY, FNAL, SLAC and KEK, finished successfully at KEK- STF on February in 2011, is a crucial project for ILC. For this project, 8 SRF cavities, 2 from DESY, 2 from FNAL and 4 from KEK, were installed into one cryomodule with the thermal shields and the cooling pipes of liquid helium and nitrogen, cooled down to 2K totally three times, and cold-tested by using the three different frequency tuning systems (Blade tuner from INFN/FNAL, Saclay tuner from DESY and Slide-Jack tuner from KEK) and two types of input couplers (TTF III from DESY and STF#2 from KEK). During the cold test with high power, cavity performance, LFD (Lorentz Force Detuning) compensation by Piezo actuator, simultaneous 7 SRF cavities operation, dynamic heating loss measurement including static loss and DRFS (Distributed RF Scheme) operation with LLRF (Low Level RF) feedback system, were established successfully. In this talk, the results of the S1-Global cryomodule test are reported, discussed and summarized.

Slides THIOA01 [11.254 MB]

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
MOIOB01	SRF Development for High Energy Physics	20
	M.S. Champion Fermilab, Batavia, USA
	Funding: Supported by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy. Superconducting Radio-Frequency (SRF) technology has become the technology of choice for accelerator-based high energy physics (HEP) research, from the operating Large Hadron Collider to the planned Project X and International Linear Collider. The HEP community has made large investments in recent years in preparation for the construction of a SRF-based project, and the SRF community has grown commensurately. Results and ongoing efforts will be described along with some comparison to the application of SRF technology in non-HEP applications.
	Slides MOIOB01 [3.348 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.

TUPO006	High Power Couplers for the Project X Linac	361
	S. Kazakov, M.S. Champion, S. Cheban, T.N. Khabiboulline, M. Kramp, Y. Orlov, O. Pronitchev, V.P. Yakovlev Fermilab, Batavia, USA
	Project X, a multi-megawatt proton source under development at Fermi National Accelerator Laboratory. [1]. The key element of the project is a superconducting (SC) 3GV continuous wave (CW) proton linac. The linac includes 5 types of SC accelerating cavities of two frequencies.(325 and 650MHz) The cavities consume up to 30 kW average RF power and need proper main couplers. Requirements and approach to the coupler design are discussed in the report. Results of electrodynamics and thermal simulations are presented. New cost effective schemes are described.

TUPO025	Integrated Cavity Processing Apparatus at Fermilab: SRF Cavity Processing R&D	424
	C.A. Cooper, M.S. Champion, L.D. Cooley, V. Poloubotko, O. Pronitchev, A.M. Rowe, M. Wong Fermilab, Batavia, USA
	A center for cavity processing R&D at Fermilab, called the Integrated Cavity Processing Apparatus, is currently in the final stages of installation and commissioning. This facility contains centrifugal barrel polishing, a horizontal electropolishing tool, a 1000°C vacuum furnace, a high pressure rinse tool utilizing ultrapure water, ISO class 4, 5 and 6 clean rooms for cavity assembly work and various other associated pieces of support equipment. All the operations are designed for single cell and nine cell 1.3 GHz Tesla type cavities except for the electropolishing tool which will initially be only for single cell use. Upgrades are currently being examined for single and five cell 650 MHz cavities. The current status of the facility and plans for future work are discussed.

TUPO028	Qualification of the Second Batch Production 9-Cell Cavities Manufactured by AES and Validation of the First US Industrial Cavity Vendor for ILC	433
	R.L. Geng, D. Forehand, B.A. Golden, P. Kushnick, R.B. Overton JLAB, Newport News, Virginia, USA M. Calderaro, E. Peterson, J. Rathke AES, Medford, NY, USA M.S. Champion, J. Follkie Fermilab, Batavia, USA A.C. Crawford CLASSE, Ithaca, New York, USA
	Funding: This work was authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177 One of the major goals of ILC SRF cavity R&D is to develop industrial capabilities of cavity manufacture and processing in all three regions. In the past several years, Jefferson Lab, in collaboration with Fermi National Accelerator Laboratory, has processed and tested all the 9-cell cavities of the first batch (4 cavities) and second batch (6 cavities) production cavities manufactured by Advanced Energy Systems Inc. (AES). Over the course, close information feedback was maintained, resulting in changes in fabrication and processing procedures. A light buffered chemical polishing was introduced, removing the weld splatters that could not be effectively removed by heavy EP alone. An 800 Celsius 2 hour vacuum furnace heat treatment procedure replaced the original 600 Celsius 10 hour procedure. Four out of the six 9-cell cavities of the second production bath achieved a gradient of 36-41 MV/m at a Q0 of more than 8·10⁹ at 35 MV/m. This result validated AES as the first “ILC certified” industrial vendor in the US for ILC cavity manufacture.

TUPO042	SLAC/FNAL TTF3 Coupler Assembly and Processing Experience	476
	C. Adolphsen, A.A. Haase, C.D. Nantista, J. Tice, F. Wang SLAC, Menlo Park, California, USA T.T. Arkan, M.S. Champion, S. Kazakov, A. Lunin, K.S. Premo Fermilab, Batavia, USA
	Funding: Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515 The TTF3-style coupler is typically used to power 1.3 GHz TESLA-type superconducting cavities. For the US ILC program, parts purchased in industry for such couplers are received at SLAC where they are inspected, cleaned, assembled as pairs in a Class 10 cleanroom, pumped down, baked at 150 degC and rf processed. The pairs are then shipped to FNAL and installed in cavities that are then tested at input power levels up to 300 kW. This paper describes the coupler results to date including improvements to the procedures and efforts to mitigate problems that have been encountered. Also progress on building a cold coupler section without e-beam wielding is presented.
	Poster TUPO042 [0.712 MB]

THIOA01	Test Results of the International S1-Global Cryomodule	615
	Y. Yamamoto, M. Akemoto, S. Fukuda, K. Hara, H. Hayano, N. Higashi, E. Kako, H. Katagiri, Y. Kojima, Y. Kondo, T. Matsumoto, H. Matsushita, S. Michizono, T. Miura, H. Nakai, H. Nakajima, K. Nakanishi, S. Noguchi, N. Ohuchi, T. Saeki, M. Satoh, T. Shidara, T. Shishido, T. Takenaka, A. Terashima, N. Toge, K. Tsuchiya, K. Watanabe, S. Yamaguchi, A. Yamamoto, K. Yokoya, M. Yoshida KEK, Ibaraki, Japan C. Adolphsen, C.D. Nantista SLAC, Menlo Park, California, USA T.T. Arkan, S. Barbanotti, M.A. Battistoni, H. Carter, M.S. Champion, A. Hocker, R.D. Kephart, J.S. Kerby, D.V. Mitchell, T.J. Peterson, Y.M. Pischalnikov, M.C. Ross, W. Schappert, B.E. Smith Fermilab, Batavia, USA A. Bosotti, C. Pagani, R. Paparella, P. Pierini INFN/LASA, Segrate (MI), Italy K. Jensch, D. Kostin, L. Lilje, A. Matheisen, W.-D. Möller, P. Schilling, M. Schmökel, N.J. Walker, H. Weise DESY, Hamburg, Germany
	S1-Global collaborative project by joint efforts of INFN, DESY, FNAL, SLAC and KEK, finished successfully at KEK- STF on February in 2011, is a crucial project for ILC. For this project, 8 SRF cavities, 2 from DESY, 2 from FNAL and 4 from KEK, were installed into one cryomodule with the thermal shields and the cooling pipes of liquid helium and nitrogen, cooled down to 2K totally three times, and cold-tested by using the three different frequency tuning systems (Blade tuner from INFN/FNAL, Saclay tuner from DESY and Slide-Jack tuner from KEK) and two types of input couplers (TTF III from DESY and STF#2 from KEK). During the cold test with high power, cavity performance, LFD (Lorentz Force Detuning) compensation by Piezo actuator, simultaneous 7 SRF cavities operation, dynamic heating loss measurement including static loss and DRFS (Distributed RF Scheme) operation with LLRF (Low Level RF) feedback system, were established successfully. In this talk, the results of the S1-Global cryomodule test are reported, discussed and summarized.
	Slides THIOA01 [11.254 MB]

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]