SRF2017 - List of Authors (Sha, P.)

Paper	Title	Page
MOXA07	Development of the C-ADS SRF Accelerator at IHEP	19
	F. Yan, L. Bian, J.S. Cao, Y. Chen, Y.L. Chi, J.P. Dai, L. Dong, L.L. Dong, Y.Y. Du, H.F.S. Feisi, Y. Gao, R. Ge, H. Geng, D.Z. Guo, D.Y. He, J. He, T.M. Huang, X. Jing, B. Li, H. Li, L. Li, S.P. Li, H.Y. Lin, F. Liu, R.L. Liu, F. Long, Y.H. Lu, H.Z. Ma, Q. Ma, X. Ma, C. Meng, Z.H. Mi, H.F. Ouyang, W.M. Pan, S. Pei, Q.L. Peng, X.H. Peng, P. Sha, H. Shi, P. Su, Y.F. Sui, L.R. Sun, X.T. Sun, G.W. Wang, J.L. Wang, S.C. Wang, G. Wu, O. Xiao, X.C. Yang, Q. Ye, R. Ye, L. Yu, X.Y. Zhang, X.Y. Zhao, Y.L. Zhao, Y. Zhao, Z.H. ZhenHua, N. Zhou, Z.S. Zhou IHEP, Beijing, People's Republic of China H.Y. Zhu Institute of High Energy Physics (IHEP), People's Republic of China
	Funding: CAS Strategic Priority Research Program-Future Advanced Nuclear Fission Energy (Accelerator-Driven Sub-critical System) and National Natural Science Foundation of China, under contract NO. 11405190 The 10 MeV accelerator-driven subcritical system (ADS) Injector I test stand at Institute of High Energy Physics (IHEP) is a testing facility dedicated to demonstrate one of the two injector design schemes [Injector Scheme-I, which works at 325 MHz], for the ADS project in China. The ion source was installed since April of 2014, periods of commissioning are regularly scheduled between installation phases of the rest of the injector. Early this year, continuous wave (CW) proton beam has been successfully obtained with energy of 10MeV and average beam current around 2 mA, the single spoke cavities with smallest developed beta (βg=0.12) were applied and successfully commissioned. Single spoke cavities with higher beta (βg=0.21) were also adopted for the last cryomodule of 25MeV proton linac, and 170uA CW proton beam were shooting through recently. This contribution reports the details of the development of the C-ADS SRF accelerator at IHEP and the challenges of the CW machine commissioning
	Slides MOXA07 [5.605 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOXA07
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUXAA01	CEPC SRF System Design and Challenges	332
	J.Y. Zhai, Y.L. Chi, J. Dai, J. Gao, R. Ge, D.J. Gong, R. Han, T.M. Huang, S. Jin, Z.Q. Li, B. Liu, Z.C. Liu, Q. Ma, F. Meng, Z.H. Mi, G. Pei, Q. Qin, P. Sha, Q.Y. Wang, T.X. Zhao, H.J. Zheng IHEP, Beijing, People's Republic of China C. Pagani Università degli Studi di Milano & INFN, Segrate, Italy
	Funding: Work supported by National Key Programme for S&T Research and Development of China (Grant NO.: 2016YFA0400400) CEPC is a 100 km circular electron positron collider operating at 90-240 GeV center-of-mass energy of Z, W and Higgs bosons. CEPC and its successor SPPC, a 100 TeV center-of-mass super proton-proton collider, will ensure the elementary particle physics a vibrant field for decades to come. The conceptual design report (CDR) of CEPC will be completed in the end of 2017 as an important step to move the project forward. In this contribution, CEPC SRF system CDR design and challenges will be introduced, including the system layout and parameter choices, configuration at different operation energies, transient beam loading and its compensation, cavity fundamental mode (FM) and higher order mode (HOM) induced coupled bunch instabilities (CBI) and the beam feedback requirement, etc. The SRF technology R&D plan and progress as well as the SRF infrastructure and industrialization plan are discussed at last.
	Slides TUXAA01 [9.124 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUXAA01
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPB005	Developed Spoke Cavity Module for Main Linac of China ADS HOM Simulations and Damping Scheme for CEPC Cavities	393
	Z.Q. Li, J.S. Cao, Y.L. Chi, F.S. He, S.P. Li, H.Y. Lin, Q. Ma, Z.H. Mi, W.M. Pan, P. Sha, B. Xu, J.Y. Zhai, X.Y. Zhang IHEP, Beijing, People's Republic of China
	During past five year, two kind of spoke of Beta equal 0.21 and 0.40 were developed at IHEP CAS, the spoke cavity of beta 0.21 was adopted to accelerate proton from 10 to 32MeV, and 32 to 160MeV for beta 0.40 spoke cavity. Up to now, two kind of naked spoke cavities have been test in vertical, also the module of beta 0.21 spoke cavity, which equipped the liquid helium jacket, magnetic shield layer and frequency tuner has been fulfilled and test, the performance of all of components reach the design requirements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB005
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPB032	Study on 650MHz 5-cell Prototype Cavities at IHEP	448
	S. Jin, J. Gao, D.J. Gong, Z.C. Liu, P. Sha, J.Y. Zhai, T.X. Zhao, H.J. Zheng IHEP, Beijing, People's Republic of China
	CEPC Pre CDR pointed that the 650 MHz 5-cell SRF cavity could be a candidate for the main ring of the single-ring pretzel scheme at the Higgs energy in 2015. Then EM design of 5-cell cavities were published later. So, the study on the fabrication of a 5-cell prototype cavity with waveguide HOM couplers were carried on at IHEP. In the paper, we will mainly report the mechanical design and fabrication progress of the 5-cell prototype. Besides, fabrication of a bare 2-cell prototype cavity was also carried on according to the further study after Pre-CDR. Challenges and possible solutions for the prototypes development will also be discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB032
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPB038	Mechanical Design of a 650 MHz Superconducting RF Cavity for CEPC	471
	X.Y. Zhang Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China F.S. He, Q. Ma, Z.H. Mi, P. Sha, J.Y. Zhai IHEP, Beijing, People's Republic of China
	Funding: This study was supported by National Key Programme for S&T Research and Development (Grant NO.: 2016YFA0400400) The 650 MHz superconducting RF cavities have been proposed by IHEP for the Circular Electron-Positron Collider (CEPC). The major components are a 2-cell elliptical cavity, end groups, stiffness and helium vessel, which have been optimized to meet the design requirement. The minimization of the Lorentz force detuning and the sensitivity of resonance frequency to Helium pressure variations was the main goal of the optimization. Also detailed stress analysis, tuning and microphonics performance of dresses cavity will be presented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB038
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPB084	EP System Development at IHEP	586
	S. Jin, J. Dai, J. Gao, D.J. Gong, F.S. He, Z.Q. Li, Z.C. Liu, P. Sha, J.Y. Zhai, P. Zhang, T.X. Zhao IHEP, Beijing, People's Republic of China
	Electropolishing (EP) System is a critical facility for SRF cavity treatment, especially for high performance cavities which are necessary for several great projects like LCLS-II, CEPC, Shanghai XFEL, and so on. So, an EP system was under development at IHEP. At this stage, we would like a horizontal EP facility. Main purpose is for elliptical SRF Nb cavities like 500MHz single cell cavities. Besides, it should be compatible for other frequency cavities, such as 650MHz and 1.3GHz cavities. In this paper, we will mainly report the preliminary design for the EP system. Several key points in the design will be also discussed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB084
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEYA04	The R&D on TEM-type SRF Cavities for High-current Applications at IHEP
	F.S. He, J.P. Dai, J. Dai, N. Gan, H.X. Hao, H. Huang, T.M. Huang, X. Huang, Z.Q. Li, H.Y. Lin, R.L. Liu, Q. Ma, X. Ma, F. Meng, Z.H. Mi, W.M. Pan, X.H. Peng, P. Sha, Y. Shao, G.W. Wang, Q.Y. Wang, Z. Xue, P. Zhang, X.Y. Zhang IHEP, Beijing, People's Republic of China
	Funding: This work has been supported partly by Pioneer 'Hundred Talents Program' of Chinese Academy of Science. The recent SRF R&D efforts on TEM-type cavities at IHEP have been strongly linked to two large projects: high current proton linac for ADS and High Energy Photon Source (HEPS). A CW 10 MeV proton injector and part of the 25 MeV main linac for the CADS project are developed at IHEP. 14 SRF spoke012 cavities for the injector have been commissioned with 10.6mA proton beam at 10.67MeV; while 6 SRF spoke021 cavities for the main linac have been assembled into cryomodule in Lanzhou. 166.6 MHz quarter-wave β=1 cavities were proposed for HEPS storage ring, required by the planned on-axis beam accumulation injection scheme. Each 166.6 MHz cavity will be operated at 4 K providing 1.2 MV accelerating voltage and 145 kW of power to the electron beam. A proof-of-principle cavity has been manufactured and vertical tested recently with a success. HOM damping is currently being designed. The development progress of the 6 types of spoke, HWR, QWR cavities, and their ancillaries, as well as the spoke cavity performance during beam operation, will be addressed.
	Slides WEYA04 [2.904 MB]
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPB036	R&D of CEPC Cavity	463
	P. Sha Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China B. Liu, Z.H. Mi, J.Y. Zhai, X.Y. Zhang, H.J. Zheng IHEP, Beijing, People's Republic of China
	Funding: This study was supported by National Key Programme for S&T Research and Development (Grant NO.: 2016YFA0400400) and National Natural Science Foundation of China (Grant NO.: 11505197) CEPC will use 650 MHz cavities for the collider (Main Ring) and 1.3 GHz cavities for the Booster. Each booster cryomodule contains eight 1.3 GHz 9-cell cavities, which is similar as LCLS-II. Each collider cryomodule contains six 650 MHz 2-cell cavities, which is totally new. So our R&D of CEPC cavity mainly focuses on the 650 MHz 2-cell cavity. A cryomodule which consists of two 650 MHz 2-cell cavities has began in early 2017. In this thesis, the RF and mechanical design is displayed with Helium Vessel. Besides, multipacting is analyzed. In order to achieve high Q, N-doping is also studied.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB036
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Development of the C-ADS SRF Accelerator at IHEP

19

F. Yan, L. Bian, J.S. Cao, Y. Chen, Y.L. Chi, J.P. Dai, L. Dong, L.L. Dong, Y.Y. Du, H.F.S. Feisi, Y. Gao, R. Ge, H. Geng, D.Z. Guo, D.Y. He, J. He, T.M. Huang, X. Jing, B. Li, H. Li, L. Li, S.P. Li, H.Y. Lin, F. Liu, R.L. Liu, F. Long, Y.H. Lu, H.Z. Ma, Q. Ma, X. Ma, C. Meng, Z.H. Mi, H.F. Ouyang, W.M. Pan, S. Pei, Q.L. Peng, X.H. Peng, P. Sha, H. Shi, P. Su, Y.F. Sui, L.R. Sun, X.T. Sun, G.W. Wang, J.L. Wang, S.C. Wang, G. Wu, O. Xiao, X.C. Yang, Q. Ye, R. Ye, L. Yu, X.Y. Zhang, X.Y. Zhao, Y.L. Zhao, Y. Zhao, Z.H. ZhenHua, N. Zhou, Z.S. Zhou
IHEP, Beijing, People's Republic of China
H.Y. Zhu
Institute of High Energy Physics (IHEP), People's Republic of China

Funding: CAS Strategic Priority Research Program-Future Advanced Nuclear Fission Energy (Accelerator-Driven Sub-critical System) and National Natural Science Foundation of China, under contract NO. 11405190
The 10 MeV accelerator-driven subcritical system (ADS) Injector I test stand at Institute of High Energy Physics (IHEP) is a testing facility dedicated to demonstrate one of the two injector design schemes [Injector Scheme-I, which works at 325 MHz], for the ADS project in China. The ion source was installed since April of 2014, periods of commissioning are regularly scheduled between installation phases of the rest of the injector. Early this year, continuous wave (CW) proton beam has been successfully obtained with energy of 10MeV and average beam current around 2 mA, the single spoke cavities with smallest developed beta (βg=0.12) were applied and successfully commissioned. Single spoke cavities with higher beta (βg=0.21) were also adopted for the last cryomodule of 25MeV proton linac, and 170uA CW proton beam were shooting through recently. This contribution reports the details of the development of the C-ADS SRF accelerator at IHEP and the challenges of the CW machine commissioning

Slides MOXA07 [5.605 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOXA07

Export •

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

TUXAA01

CEPC SRF System Design and Challenges

332

J.Y. Zhai, Y.L. Chi, J. Dai, J. Gao, R. Ge, D.J. Gong, R. Han, T.M. Huang, S. Jin, Z.Q. Li, B. Liu, Z.C. Liu, Q. Ma, F. Meng, Z.H. Mi, G. Pei, Q. Qin, P. Sha, Q.Y. Wang, T.X. Zhao, H.J. Zheng
IHEP, Beijing, People's Republic of China
C. Pagani
Università degli Studi di Milano & INFN, Segrate, Italy

Funding: Work supported by National Key Programme for S&T Research and Development of China (Grant NO.: 2016YFA0400400)
CEPC is a 100 km circular electron positron collider operating at 90-240 GeV center-of-mass energy of Z, W and Higgs bosons. CEPC and its successor SPPC, a 100 TeV center-of-mass super proton-proton collider, will ensure the elementary particle physics a vibrant field for decades to come. The conceptual design report (CDR) of CEPC will be completed in the end of 2017 as an important step to move the project forward. In this contribution, CEPC SRF system CDR design and challenges will be introduced, including the system layout and parameter choices, configuration at different operation energies, transient beam loading and its compensation, cavity fundamental mode (FM) and higher order mode (HOM) induced coupled bunch instabilities (CBI) and the beam feedback requirement, etc. The SRF technology R&D plan and progress as well as the SRF infrastructure and industrialization plan are discussed at last.

Slides TUXAA01 [9.124 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUXAA01

Export •

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

TUPB005

Developed Spoke Cavity Module for Main Linac of China ADS HOM Simulations and Damping Scheme for CEPC Cavities

393

Z.Q. Li, J.S. Cao, Y.L. Chi, F.S. He, S.P. Li, H.Y. Lin, Q. Ma, Z.H. Mi, W.M. Pan, P. Sha, B. Xu, J.Y. Zhai, X.Y. Zhang
IHEP, Beijing, People's Republic of China

During past five year, two kind of spoke of Beta equal 0.21 and 0.40 were developed at IHEP CAS, the spoke cavity of beta 0.21 was adopted to accelerate proton from 10 to 32MeV, and 32 to 160MeV for beta 0.40 spoke cavity. Up to now, two kind of naked spoke cavities have been test in vertical, also the module of beta 0.21 spoke cavity, which equipped the liquid helium jacket, magnetic shield layer and frequency tuner has been fulfilled and test, the performance of all of components reach the design requirements.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB005

Export •

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

TUPB032

Study on 650MHz 5-cell Prototype Cavities at IHEP

448

S. Jin, J. Gao, D.J. Gong, Z.C. Liu, P. Sha, J.Y. Zhai, T.X. Zhao, H.J. Zheng
IHEP, Beijing, People's Republic of China

CEPC Pre CDR pointed that the 650 MHz 5-cell SRF cavity could be a candidate for the main ring of the single-ring pretzel scheme at the Higgs energy in 2015. Then EM design of 5-cell cavities were published later. So, the study on the fabrication of a 5-cell prototype cavity with waveguide HOM couplers were carried on at IHEP. In the paper, we will mainly report the mechanical design and fabrication progress of the 5-cell prototype. Besides, fabrication of a bare 2-cell prototype cavity was also carried on according to the further study after Pre-CDR. Challenges and possible solutions for the prototypes development will also be discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB032

Export •

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

TUPB038

Mechanical Design of a 650 MHz Superconducting RF Cavity for CEPC

471

X.Y. Zhang
Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China
F.S. He, Q. Ma, Z.H. Mi, P. Sha, J.Y. Zhai
IHEP, Beijing, People's Republic of China

Funding: This study was supported by National Key Programme for S&T Research and Development (Grant NO.: 2016YFA0400400)
The 650 MHz superconducting RF cavities have been proposed by IHEP for the Circular Electron-Positron Collider (CEPC). The major components are a 2-cell elliptical cavity, end groups, stiffness and helium vessel, which have been optimized to meet the design requirement. The minimization of the Lorentz force detuning and the sensitivity of resonance frequency to Helium pressure variations was the main goal of the optimization. Also detailed stress analysis, tuning and microphonics performance of dresses cavity will be presented in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB038

Export •

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

TUPB084

EP System Development at IHEP

586

S. Jin, J. Dai, J. Gao, D.J. Gong, F.S. He, Z.Q. Li, Z.C. Liu, P. Sha, J.Y. Zhai, P. Zhang, T.X. Zhao
IHEP, Beijing, People's Republic of China

Electropolishing (EP) System is a critical facility for SRF cavity treatment, especially for high performance cavities which are necessary for several great projects like LCLS-II, CEPC, Shanghai XFEL, and so on. So, an EP system was under development at IHEP. At this stage, we would like a horizontal EP facility. Main purpose is for elliptical SRF Nb cavities like 500MHz single cell cavities. Besides, it should be compatible for other frequency cavities, such as 650MHz and 1.3GHz cavities. In this paper, we will mainly report the preliminary design for the EP system. Several key points in the design will be also discussed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB084

Export •

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

WEYA04

The R&D on TEM-type SRF Cavities for High-current Applications at IHEP

F.S. He, J.P. Dai, J. Dai, N. Gan, H.X. Hao, H. Huang, T.M. Huang, X. Huang, Z.Q. Li, H.Y. Lin, R.L. Liu, Q. Ma, X. Ma, F. Meng, Z.H. Mi, W.M. Pan, X.H. Peng, P. Sha, Y. Shao, G.W. Wang, Q.Y. Wang, Z. Xue, P. Zhang, X.Y. Zhang
IHEP, Beijing, People's Republic of China

Funding: This work has been supported partly by Pioneer 'Hundred Talents Program' of Chinese Academy of Science.
The recent SRF R&D efforts on TEM-type cavities at IHEP have been strongly linked to two large projects: high current proton linac for ADS and High Energy Photon Source (HEPS). A CW 10 MeV proton injector and part of the 25 MeV main linac for the CADS project are developed at IHEP. 14 SRF spoke012 cavities for the injector have been commissioned with 10.6mA proton beam at 10.67MeV; while 6 SRF spoke021 cavities for the main linac have been assembled into cryomodule in Lanzhou. 166.6 MHz quarter-wave β=1 cavities were proposed for HEPS storage ring, required by the planned on-axis beam accumulation injection scheme. Each 166.6 MHz cavity will be operated at 4 K providing 1.2 MV accelerating voltage and 145 kW of power to the electron beam. A proof-of-principle cavity has been manufactured and vertical tested recently with a success. HOM damping is currently being designed. The development progress of the 6 types of spoke, HWR, QWR cavities, and their ancillaries, as well as the spoke cavity performance during beam operation, will be addressed.

Slides WEYA04 [2.904 MB]

Export •

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

TUPB036

R&D of CEPC Cavity

463

P. Sha
Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China
B. Liu, Z.H. Mi, J.Y. Zhai, X.Y. Zhang, H.J. Zheng
IHEP, Beijing, People's Republic of China

Funding: This study was supported by National Key Programme for S&T Research and Development (Grant NO.: 2016YFA0400400) and National Natural Science Foundation of China (Grant NO.: 11505197)
CEPC will use 650 MHz cavities for the collider (Main Ring) and 1.3 GHz cavities for the Booster. Each booster cryomodule contains eight 1.3 GHz 9-cell cavities, which is similar as LCLS-II. Each collider cryomodule contains six 650 MHz 2-cell cavities, which is totally new. So our R&D of CEPC cavity mainly focuses on the 650 MHz 2-cell cavity. A cryomodule which consists of two 650 MHz 2-cell cavities has began in early 2017. In this thesis, the RF and mechanical design is displayed with Helium Vessel. Besides, multipacting is analyzed. In order to achieve high Q, N-doping is also studied.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB036

Export •

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