Brief
Introduction
The
Beijing Electron Positron Collider (BEPC) consists of the injector, the
storage ring, the transportation line, the Beijing Spectrometer (BES), the
Beijing Synchrotron Radiation Facility (BSRF) and the computer center. On
the right is the general layout of the BEPC.
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The injector
It
is
an electron position linear accelerator that can accelerate the
electrons and positrons to 1.3 GeV. It is composed of the following
6 systems: |
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1. The accelerating system It is composed of 56 accelerating tubes of disk loaded waveguide with each being 3.05 m long, 42 sets of supports for the accelerating tubes, 45 quadruple magnets, 1ns electron gun and positron converter, totaling 202 m long. It was installed in the tunnel that is 6 meters from the ground. |
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2. The microwave power source It
consists of 16 high power klystrons and modulators, 13 sets of
energy doublers, 1 power source, 1 phase control system and 1
microwave transmission line. It was installed in the 200 m long
gallery on top of the tunnel. |
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3. The vacuum system The
vacuum required by the accelerating system and the microwave system
is 10-8 torr. Both in the tunnel and the gallery, there
is a 200 m long vacuum pipe connecting the vacuum system. In
addition, there are also vacuum pumps, vacuum valves and vacuum
protection system.
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4. The automatic control system It
exercises remote control of the parameters of various electronic
apparatuses from the local station of the injector. |
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5. The beam measuring system 80
beam measuring probes of 6 kinds were placed in the injector to
monitor the beam behavior. 6. The constant temperature water system, the ventilation
system, etc. There
are constant temperature water pipe lines, water pump stations and
automatic adjustment lines to ensure that the accelerating tubes and
the wave guide transmission lines work under constant temperature.
The beam transport line The
beam transportation line is connected with the injector and the
storage ring. It encompasses a 30 m long common section and the east
and west section with each being 90 m long. The beam transportation
line is to transport the electron positron beams output from the
injector respectively to the storage ring. In the transportation
line, there are 33 bending magnets, 42 quadruple magnets and 26
correcting magnets, and 78 beam measuring probes of 9 kinds, high
vacuum systems, etc.. All the magnets power supplies and the control
system were installed in the ground hall with the required vacuum
being 10-8 torr and the installation accuracy of each
part being 0.2 mm. The beams pass the transportation line without
any interruption and the transportation efficiency of the electron
and positron beams being 80% and 90% respectively.
The
storage ring The
storage ring is a sports track shaped accelerator with a
circumference of 240.4 m. It comprises the following 6 systems: |
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1. Magnets and power supplies There are 44 bending magnets, 60 quadruple magnets, 8 high precision insertion quadruple magnets, 36 sextuple correcting magnets and 175 high current power supplies of 17 kinds. |
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2. The RF accelerating system It
consists of 4 accelerating cavities, 8 RF transmitters and the
accessories. |
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septum magnet |
UHV & quardruple magnet |
vacuum chambers in tunnel |
electrostatic separator |
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