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WEOBB04 |
Operation of Superconducting Final Focus Magnet System of SuperKEKB | |
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| SuperKEKB has been constructed with the target luminosity of 8×1035, which is 40 times higher than KEKB, by the "Nano-Beam" scheme. The beams of 7 GeV electrons and 4 GeV positrons collide at the interaction point (IP) with the crossing angle of 83 mrad, and both beams are squeezed to 50 nano-m in the vertical direction and 10 micro-m in the horizontal direction at IP by the superconducting magnet system. The system consists of 8 superconducting quadrupole magnets (quadrupole doublets), 4 superconducting solenoids and 43 superconducting corrector magnets. After the installation of the magnet system into the beam interaction region, SuperKEKB was operated as the Phase-2 beam commissioning from 2018 March to 2018 July. In the paper, we would like to describe the superconducting magnet system and the experiences on the magnet system during the beam operation. | ||
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| WEPAB04 | KEKB/SuperKEKB Cryogenics Operation | 276 |
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| KEKB/SuperKEKB cryogenics operation will be introduced. KEKB was built in the tunnel of the TRISTAN accelerator. The TRISTAN accelerator was operated from 1986 to 1995. The superconducting acceleration cavities were installed in 1988 to increase the beam energy. The cryogenic system for superconducting cavities was also established simultaneously. In 1989 superconducting cavities were added, and cryogenic systems were also enhanced from 4kW to 6.5kW. KEKB took over many facilities from TRISTAN. The cryogenic system for superconducting cavities is one of them. This old refrigerator is used also in SuperKEKB. In operation of the cryogenic system, it is necessary to cool down the equipment from room temperature. In KEKB, its cooling rate of cavities are limited to 2.5~3K/h. In the steady state, the pressure and the liquid level in the superconducting cavity cryomodule should be kept constant. To keep the condition in the cryomodule stably, the sum of the heat generated by RF and the heater is controlled as constant. In KEKB/SuperKEKB, superconducting magnets are also used. They have their own refrigerator. In the workshop, they are also introduced. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEPAB04 | |
| About • | paper received ※ 24 September 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019 | |
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