BEPCⅡ Positron Source

PEI Guo-Xi; SUN Yao-Lin; LIU Jin-Tong; CHI Yun-Long; LIU Yu-Cheng; LIU Nian-Zong

Chinese Physics C> 2006, Vol. 30> Issue(1) : 66-70

BEPCⅡ Positron Source

Institute of High Energy Physics,CAS,Beijing 100049,China

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Abstract：
BEPCⅡ— an upgrade project of the Beijing Electron Positron Collider (BEPC) is a factory type of e^＋e^－ collider. The fundamental requirements for its injector linac are the beam energy of 1.89GeV for on-energy injection and a 40mA positron beam current at the linac end with a low beam emittance of 1.6μm and a low energy spread of ±0.5% so as to guarantee a higher injection rate (≥50mA/min) to the storage ring. Since the positron flux is proportional to the primary electron beam power on the target, we will increase the electron gun current from 4A to 10A by using a new electron gun system and increase the primary electron energy from 120MeV to 240MeV. The positron source itself is an extremely important system for producing more positrons, including a positron converter target chamber, a 12kA flux modulator, the 7m focusing module with DC power supplies and the support. The new positron production linac from the electron gun to the positron source has been installed into the tunnel. In what follows, we will emphasize the positron source design, manufacture and tests.

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[1]

. PEI G X et al. Design Report of the BEPC/ InjectorLinac: IHEP-BEPCII-SB-03-02. November 20032. GOU W P, PEI G X. HEP NP, 2002, 26(3): 279-285(in Chinese)(苟卫平,裴国玺.高能物理与核物理,2002, 26(3): 279-285)3. Kulikov A V et al. SLC Positron Source Pulsed Flux Con-centrator. Proceedings of 1991 IEEE Particle Accelerator Conference. San Francisco, 1991. 20054. LIU J T et al. HEP NP, 2005, 29(4): 404(in Chinese)(刘晋通等.高能物理与核物理,2005, 29(4): 404)5. Lamare J de, et al. SLC Positron Source Flux Concentrator Modulator. Proceedings of 1991 IEEE Particle Accelerator Conference. San Francisco, 1991. 31386. Nam S H et al. Injection Kicker Modulator in 2GeV PohangLight Source.Proceedings of 1998 Twenty Third Interna-tional Power Modulator Symposium

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PEI Guo-Xi, SUN Yao-Lin, LIU Jin-Tong, CHI Yun-Long, LIU Yu-Cheng and LIU Nian-Zong. BEPCⅡ Positron Source[J]. Chinese Physics C, 2006, 30(1): 66-70.

PEI Guo-Xi, SUN Yao-Lin, LIU Jin-Tong, CHI Yun-Long, LIU Yu-Cheng and LIU Nian-Zong. BEPCⅡ Positron Source[J]. Chinese Physics C, 2006, 30(1): 66-70. shu

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Received: 2005-05-13
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

BEPCⅡ Positron Source

Corresponding author: PEI Guo-Xi,

Institute of High Energy Physics,CAS,Beijing 100049,China

Received Date: 2005-05-13
Accepted Date: 1900-01-01
Available Online: 2006-01-05

Abstract: BEPCⅡ— an upgrade project of the Beijing Electron Positron Collider (BEPC) is a factory type of e^＋e^－ collider. The fundamental requirements for its injector linac are the beam energy of 1.89GeV for on-energy injection and a 40mA positron beam current at the linac end with a low beam emittance of 1.6μm and a low energy spread of ±0.5% so as to guarantee a higher injection rate (≥50mA/min) to the storage ring. Since the positron flux is proportional to the primary electron beam power on the target, we will increase the electron gun current from 4A to 10A by using a new electron gun system and increase the primary electron energy from 120MeV to 240MeV. The positron source itself is an extremely important system for producing more positrons, including a positron converter target chamber, a 12kA flux modulator, the 7m focusing module with DC power supplies and the support. The new positron production linac from the electron gun to the positron source has been installed into the tunnel. In what follows, we will emphasize the positron source design, manufacture and tests.