| Paper |
Title |
Page |
| MOP18 |
Cold-Model Tests and Fabrication Status for J-PARC ACS
|
75 |
| |
- H. Ao, H. Akikawa
JAERI/LINAC, Ibaraki-ken
- K. Hasegawa, A. Ueno
JAERI, Ibaraki-ken
- N. Hayashizaki
TIT, Tokyo
- M. Ikegami, S. Noguchi
KEK, Ibaraki
- V.V. Paramonov
RAS/INR, Moscow
- Y. Yamazaki
J-PARC, Ibaraki-ken
|
|
| |
The J-PARC (Japan Proton Accelerator Research Complex) LINAC will be commissioned with energy of 181-MeV using 50 keV ion source, 3 MeV RFQ, 50 MeV DTL and 181 MeV SDTL (Separated DTL) on September 2006. It is planed to be upgraded by using 400 MeV ACS (Annular Coupled Structure), which is a high-beta structure most suitable for the J-PARC, in a few years from the commissioning. The first ACS cavity, which will be used as the first buncher between the SDTL and the ACS, is under fabrication. Detailed design and tuning procedure of ACS cavities has been studied with RF simulation analysis and cold-model measurements. The results of cold-model measurements, fabrication status, and related development items are described in this paper.
|
|
| TUP06 |
Results of the High-Power Conditioning and the First Beam Acceleration of the DTL-1 for J-PARC
|
300 |
| |
- F. Naito, S. Anami, J. Chiba, Y. Fukui, K. Furukawa, Z. Igarashi, K. Ikegami, M. Ikegami, E. Kadokura, N. Kamikubota, T. Kato, M. Kawamura, H. Kobayashi, C. Kubota, E. Takasaki, H. Tanaka, S. Yamaguchi, K. Yoshino
KEK, Ibaraki
- K. Hasegawa, Y. Kondo, A. Ueno
JAERI, Ibaraki-ken
- T. Itou, Y. Yamazaki
JAERI/LINAC, Ibaraki-ken
- T. Kobayashi
J-PARC, Ibaraki-ken
|
|
| |
The first tank of the DTL for Japan Proton Accelerator Research Complex (J-PARC) was installed in the test facility at KEK. The DTL tank is 9.9 m in length and consists of the 76 cells. The resonant frequency of the tank is 324 MHz. After the installation of the tank, the high-power conditioning was carried out deliberately. Consequently the peak rf power of 1.3 MW (pulse repetition 50 Hz, pulse length 600 μs) was put into the tank stably. (The required power is about 1.1 MW for the designed accelerating field of 2.5 MV/m on the axis.) Following the conditioning, negative hydrogen beam, accelerated by the RFQ linac up to 3 MeV, was injected to the DTL and accelerated up to its design value of 19.7 MeV. The peak current of 30 mA was achieved with almost 100% transmission. In this paper, the conditioning history of the DTL and the result of the first beam test will be described.
|
|
| TUP21 |
Beam Dynamics Design of J-PARC Linac High Energy Section
|
339 |
| |
- M. Ikegami, T. Kato, S. Noguchi
KEK, Ibaraki
- H. Ao, Y. Yamazaki
JAERI/LINAC, Ibaraki-ken
- K. Hasegawa, T. Ohkawa, A. Ueno
JAERI, Ibaraki-ken
- N. Hayashizaki
TIT, Tokyo
- V.V. Paramonov
RAS/INR, Moscow
|
|
| |
J-PARC linac consists of a 3 MeV RFQ linac, a 50 MeV DTL (Drift Tube Linac), a 190 MeV SDTL (Separate-type DTL), and a 400 MeV ACS (Annular-Coupled Structure) linac. Recently, the beam dynamics design of the ACS part has been slightly modified to reduce construction cost. Namely, the number of klystron modules are reduced from 23 to 21, and the number of accelerating cells in one klystron module is increased from 30 to 34 to maintain the total energy gain. This design change curtails the margin for RF power by around 5 %, and the total length of the ACS section is nearly unchanged. The beam matching section between SDTL and ACS is also revised correspondingly. These modifications of the design are described in this paper together with 3D particle simulation results for the new design.
|
|
| TUP70 |
Systematic Calibration of Beam Position Monitor in the High Intensity Proton Accelerator (J-PARC) LINAC
|
429 |
| |
- S. Sato, K. Hasegawa, F. Hiroki, J. Kishiro, Y. Kondo, M. Tanaka, T. Tomisawa, A. Ueno, H. Yoshikawa
JAERI, Ibaraki-ken
- Z. Igarashi, M. Ikegami, N. Kamikubota, S. Lee, K. Nigorikawa, T. Toyama
KEK, Ibaraki
|
|
| |
In J-PARC, a MW class of proton accelerator is under construction. Improperly- tuned beam would critically result in unacceptable (>0.1%) energy loss. Systematic strategy of fine calibrations of the beam position monitor (BPM) detectors, is therefore required. First, Off-beam-line calibrations of BPMs are taken, with a dedicatedly- designed bench, which has a beam-simulating electric wire carrying 324 MHz. And then discrepancies are calibrated for each BPM between reconstructed electrical center of pick-up plates and measured mechanical center, before the installation of BPM on the beam line. Secondly, after BPMs are installed on the beam line, real beam is used for systematic calibrations (Beam Based Calibration (BBC)). The discrepancies are calibrated between electromagnetic center of Q-magnets and reconstructed beam position. In KEK we have the first stage of J-Parc LINAC with Ion source, RFQ, DTL, Q- and steering-magnets, and lots of BPMs. Implementation of BBC is going with SAD-language, which can also be used for beam steering and beam trajectory simulations, e.g. TRACE-3D. In this presentation, such strategic BPM calibration system will be intensively described.
|
|
| TUP85 |
J-PARC Linac Alignment
|
474 |
| |
- M. Ikegami, C. Kubota, F. Naito, E. Takasaki, H. Tanaka, K. Yoshino
KEK, Ibaraki
- H. Ao, T. Itou
JAERI/LINAC, Ibaraki-ken
- K. Hasegawa, T. Morishita, N. Nakamura, A. Ueno
JAERI, Ibaraki-ken
|
|
| |
J-PARC linac consists of a 3 MeV RFQ linac, a 50 MeV DTL (Drift Tube Linac), a 190 MeV SDTL (Separate-type DTL), and a 400 MeV ACS (Annular-Coupled Structure) linac, and its total length is more than 400 m including the beam transport line to the succeeding RCS (Rapid Cycling Synchrotron). In high-current proton accelerators, precise alignment of accelerator components is indispensable to reduce uncontrolled beam loss and beam quality deterioration. In this paper, planned schemes for the linac alignment is presented together with instrumentation for the long-term ground-motion watching.
|
|