| Paper |
Title |
Page |
| TOAD003 |
Development of the Beam Diagnostics System for the J-PARC Rapid-Cycling Synchrotron
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299 |
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- N. Hayashi, S.H. Hiroki, J. Kishiro, Y.T. Teruyama, R. Toyokawa
JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- D.A. Arakawa, S. Lee, T. Miura, T. Toyama
KEK, Ibaraki
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Development of the beam diagnostics system for the J-PARC (Japan Proton Accelerator Research Complex) Rapid-Cycling Synchrotron is described. The system consists of Beam Position Monitor (BPM), Beam Loss Monitor (BLM), Current monitors (DCCT, SCT, MCT, FCT, WCM), Tune meter system, 324MHz-BPM, Profile monitor, and Halo monitor. BPM electrode is electro-static type and its electronics is designed for both COD and turn-by-turn measurements. Five current monitors have different time constants in order to cover wide frequency range. The tune meter is consisted of RFKO and the beam pick-up electrode. For the continuous injected beam monitoring, 324MHz-BPM detects Linac frequency. Two types of profile monitor are multi-wire for low intensity tuning and the residual gas monitor for non-destructive measurement.
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| RPAT005 |
Beam Diagnostics for the J-PARC Main Ring Synchrotron
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958 |
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- T. Toyama, D.A. Arakawa, Y. Hashimoto, S. Lee, T. Miura, S. Muto
KEK, Ibaraki
- N. Hayashi, J. Kishiro, R. Toyokawa
JAERI/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
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Beam diagnostics: beam intensity monitors (DCCT, SCT, FCT, WCM), beam position monitors (ESM), beam loss monitors (proportional chamber, air ion chamber), beam profile monitors (secondary electron emission, gas-sheet) have been designed, tested, and will be installed for the Main Ring synchrotron of J-PARC (Japan Proton Accelerator Research Complex). This paper describes the basic design principle and specification of each monitor, with a stress on how to cope with high power beam (average circulation current of ~12 A) and low beam loss operation (less than 1 W/m except a collimator region). Some results of preliminary performance test using present beams and a radiation source will be reported.
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| RPAT043 |
Developments of the Calibration Tools for Beam Position Monitor at J-PARC Linac
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2777 |
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- S. Sato, H. Akikawa, T. Tomisawa, A. Ueno
JAERI/LINAC, Ibaraki-ken
- Z. Igarashi, M. Ikegami, N. Kamikubota, S. Lee, T. Toyama
KEK, Ibaraki
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In the J-PARC LINAC, there are mainly two requirements for the beam based calibration of beam position monitors (BPMs). One is that BPMs need to be calibrated with the accuracy of about a hundred micro-meters to minimize beam loss for the world highest class of proton intensity. The other is that about a hundred of BPMs need to be calibrated consistently. To achieve these requirements, the calibration tool are being developed with experiences on real beam in a MEBT line set for the DTL commissioning. Tools for simulating the beam trajectory using transport matrix (e.g. T3D) are being developed as well. The calibrated beam positions measured by BPMs are used in the simulation for tuning the beam. Implementation of the calibration tools on the same platform (e.g. SAD) with the simulation tools is important for higher usability during commissioning of whole J-PARC. In this paper, details of these developments around BPMs are to be reported.
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| FPAE043 |
Transverse Tuning Scheme for J-PARC Linac
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2750 |
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- M. Ikegami, Z. Igarashi, S. Lee
KEK, Ibaraki
- H. Akikawa, K. Hasegawa, Y. Kondo, T. Ohkawa
JAERI, Ibaraki-ken
- H. Ao, S. Sato, T. Tomisawa, A. Ueno
JAERI/LINAC, Ibaraki-ken
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In a high-intensity linac, precise transverse matching is essential for beam halo mitigation. In this paper, we present the supposed transverse tuning scheme for J-PARC linac and the planned beam diagnostic layout for it. Relevantly, we briefly touch upon the tuning scenario for the arc section and the transverse halo collimator system which are located between the linac and the succeeding ring.
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