Tokyo City University, Tokyo
KEK, Ibaraki
NIRS, Chiba-shi
Tokyo City University, Tokyo
KEK, Ibaraki
[1] T. Iwashita et al., Phys. Rev. Lett. 98, p054801-4 (2007).
[2] T. Iwashita et al., J. of Appl. Phys. 101, p063304-7 (2007).
| Paper | Title | Page |
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| TUP070 | Development of Spill Control System for the J-PARC Slow Extraction | 245 |
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| J-PARC (Japan Proton Accelerator Research Complex) is a new accelerator facility to produce MW-class high power proton beams. From the main ring high energy protons are extracted in a slow extracted mode for hadrons experiments. The slow extraction beam is required with as small ripple as possible to prevent pileup events in particle detectors or data acquisition systems. Based on preliminary experiments at HIMAC (Heavy Ion Medical Accelerator in Chiba) using a prototype signal processing board, we have developed a new signal processing board for the spill feedback control. The circuit board consists of three signal input ports for gate, spill intensity and residual beam intensity in the main ring, three signal output ports for spill control magnets, two DSPs (TMS320C6713) for the analysis of power spectrum and the spill feedback control, dual port memories, FPGAs and a LAN interface for remote control to change feedback parameters. Using this board, digital filtering, phase-shift processing, servo feedback control, real-time calculation of power spectrum density and adaptive control are examined. | ||
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| TUP071 | The Control System for Induction Acceleration in the KEK Digital Accelerator | 248 |
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A digital accelerator (DA) is a low energy version of the induction synchrotron which has been demonstrated using the KEK 12 GeV-PS in 2006[1]. In the DA of injector-free, the acceleration and bunch confinement are independently carried out by induction cells, which are 1-to-1 transformers driven by individual switching power supplies. The switching power supply employing high power semiconductor switching devices (MOS-FET) can be operated at an arbitrary repetition rate up to 1 MHz with an output voltage of 2 kV. This characteristic allows us to realize a so-called all-ion accelerator [2] capable of accelerating all species of ion including cluster ions. To comply with specific demands for the induction acceleration in the KEK DA, that is a renovation of the existing KEK 500 MeV Booster synchrotron, a fully digital control system of the KEK DA is under development. It consists of high speed ADCs and FPGA (or DSP) to acquire the profile of beam bunch and process the required gate trigger signal from the profile data. It is crucial to trigger the acceleration system at the desired timing. Outline and R&D works of the control system described.
[1] T. Iwashita et al., Phys. Rev. Lett. 98, p054801-4 (2007). |
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Poster |