Conference Paper

BEPCII-The Second Phase Construction of Beijing Electron Positron Collider

BEPCII Team, IHEP, CAS, P.O. Box 918, Beijing 100039, P.R. China
DOI: 10.1109/PAC.2005.1590381 Conference: Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the
Source: IEEE Xplore

ABSTRACT BEPCII, the second phase construction of the Beijing Electron Positron Collider (BEPC), is a double ring machine with a design luminosity of 1×1033cm-2s-1at 1.89GeV, two orders of magnitude higher than present BEPC. The construction was started in the beginning of 2004 and is scheduled to be completed by the end of 2007. The upgrading of the collider should also provide an improved SR performance with higher beam energy and intensity. The beam currents will be increased to 250mA at E=2.5GeV for the dedicated synchrotron radiation operation. Some key technologies, such as superconducting RF cavity, superconducting micro-beta quadrupole and low impedance vacuum devices etc., are being developed in order to achieve the target of the BEPCII.

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    ABSTRACT: BEPCII is the second phase construction of the Beijing Electron Positron Collider (BEPC). It requires its injector linac to have higher beam energy (1.89GeV) for on-energy injection and a higher beam current (40mA e+ beam) for a higher injection rate (≥ 50mA/min.). The low beam emittance (1.6πmm-mrad for e+ beam, and 0.2πmm-mrad for 300mA e-beam) and low beam energy spread (± 0.5%) are also required to meet the storage ring acceptance. Hence we need a new electron gun system, a new positron source, a much higher power and more stable RF system with its phasing loops, and a new beam tuning system with orbit correction. Up to date, all system design and fabrication work have been completed. And in five months from May 1<sup>st</sup>of 2004, the positron production system— from the electron gun to the positron source, has been installed into the tunnel. In this paper, we will introduce major upgrades of each system, and present the recent beam commissioning.
    Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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    ABSTRACT: BEPCII- an upgrade project of the BEPC is a factory type of e + e - collider. It requires its injector linac to have higher beam energy (1.89 GeV) for on-energy injection and higher beam current (40 mA e+ beam) for a higher injection rate (≥50 mA/min.). In five months from May 1 st of 2004, we've installed and upgraded major parts of the machine, and then it ran for busy BSRF operation. We took very limited time to commission the machine and got a preliminary but satisfied result, the positron beam at the linac end was about 60mA. Now the linac is running smoothly, almost all design goals have been reached. In this paper, we'll present the upgrades for better beam quality, such as phasing system, beam feedback system, and report the present status of the BEPCII linac.

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