| Paper | Title | Page |
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| MOXGB1 | Report on SuperKEKB Phase 2 Commissioning | 1 |
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| The SuperKEKB electron-positron collider is being commissioned at KEK in three phases. The first phase was successfully completed in 2016, focusing on vacuum scrubbing and single beam studies without final focus optics. The second phase will start in March 2018 and until mid of July 2018. It will be dedicated to achieving the target specific luminosity larger than 4x1031 cm-2s-1/mA2, using the novel "nano-beam" collision scheme. Final focus optics will be installed, as well as the Belle-II detector, but without the vertex detector. The second phase of commissioning will also serve to assess and learn to control backgrounds induced by beam losses near the interaction region, expected to be larger than at KEKB in the past, as a result of the much smaller beams. This will be important before installing the vertex detector for the final phase of commissioning, due to start at the beginning of 2019, when high luminosity needed for data taking with the Belle-II detector should be achieved. The speaker will present the recent progress and performance of SuperKEKB that is enabled by these upgrades. | ||
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Slides MOXGB1 [28.594 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-MOXGB1 | |
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| MOPMF073 | Rejuvenation of 7-Gev SuperKEKB Injector Linac | 300 |
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| KEK injector linac has delivered electrons and positrons for particle physics and photon science experiments for more than 30 years. It was upgraded for the SuperKEKB project, which aims at a 40-fold increase in luminosity over the previous project KEKB, in order to increase our understanding of flavor physics beyond the standard model of elementary particle physics. SuperKEKB energy-asymmetric electron-positron collider with its extremely high luminosity requires a high current, low emittance and low energy spread injection beam from the injector. The electron beam is generated by a new type of RF gun, that provides a much higher beam current to correspond to a large stored beam current and a short lifetime in the ring. The positron source is another major challenge that enhances the positron bunch intensity from 1 to 4 nC by increasing the positron capture efficiency, and the positron beam emittance is reduced from 2000 μm to 10 μm in the vertical plane by introducing a damping ring, followed by the bunch compressor and energy compressor. The summary of the rejuvenation is reported. | ||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-MOPMF073 | |
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| TUZGBE2 | Final-focus Superconducting Magnets for SuperKEKB | 1215 |
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| The SuperKEKB collider aims at 40 times higher luminosity than that achieved at KEKB, based on the nano-beam scheme. The vertical beta function at the interaction point will be squeezed to 300μmeter. Final-focus superconducting magnet system which consists of eight main quadrupole magnets, 43 corrector windings, and compensation solenoids is a key component to achieve high luminosity. This invited talk presents the construction and commissioning of the final-focus magnet system. | ||
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Slides TUZGBE2 [4.235 MB] | |
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUZGBE2 | |
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| WEPAK015 | Beam Gate Control System for SuperKEKB | 2124 |
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The electron beam pulses of injector linac for the SuperKEKB collider are enabled and disabled by Beam Gate control system. This system controls the delivery of triggers to the electron guns at the injector. Also, the septum and kicker magnets for injection point of main ring are controlled with this Beam Gate to avoid unnecessary operation and to prolong their lifetime. The Beam Gate synchronizes the enabling and disabling operations of these hardware even though they are about 1km distant. Besides, from the phase-2 operation, the kicker and septum magnets for newly constructed damping ring becomes controlled apparatus of this system. We develop the new Beam Gate control system with the Event Timing System network*. The new system improves the unsatisfied performance of Beam Gate in the phase-1 operation and realizes the complicated control for phase-2. The advantages of new system are: the control signal is delivered via Event nettork, so that we do not need to cable new network. The enabling and disabling operations for distant hardware are surely synchronized by the Event Timing System.
* H. Kaji et al., "Construction and Commissioning Event Timing System at SuperKEKB", Proceedings of IPAC14, Dresden, Germany (2014). |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-WEPAK015 | |
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