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Title |
Page |
| THP068 |
RF Characteristics of the SDTL for the J-PARC
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740 |
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- T. Ito, H. Asano, T. Morishita
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- T. Kato, F. Naito, E. Takasaki, H. Tanaka
KEK, Ibaraki
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For the J-PARC linac, a Separated type DTL (SDTL) is used to accelerate an H- ion beam from 50MeV to 191MeV. The SDTL consists of 32 tanks and the operating frequency is 324MHz. It has 4 drift tubes and 2 half tubes (5cells), 2 fix tuners, 1 movable tuner and 1 RF input coupler. The inner diameter is 520mm and the length is approximately from 1.5m (SDTL1) to 2.5m (SDTL32). The focusing magnets are set between the tanks. We have measured the RF characteristics of the SDTL tanks and adjusted the field distribution since last summer. The measured Q value was above 90% of ideal SUPERFIS value, the field distribution was adjusted within ±1% for all the tanks. In this paper, the results of RF measurements of the SDTL tanks are described.
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| THP069 |
DTL and SDTL Installation for the J-PARC
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743 |
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- F. Naito, E. Takasaki, H. Tanaka
KEK, Ibaraki
- H. Asano, T. Ito, T. Morishita
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
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Three DTL tanks and 30 SDTL tanks have been installed precisely in the under-ground tunnel of the J-PARC project. The alignment of the tank was mainly done by using an alignment telescope. The distance of the center axis of the tank from the beam axis was measured by the telescope of which axis is in the beam line. The distance is minimized by adjusting the position of the tank on the stand. The beam axis in the tank is defined by the two optical target which are put on the template fixed on both ends of the tank cylinder for the DTL. After the installation of the tanks the movable tuners and the input couplers were also fixed on the tank. In the paper the measured tank position will be described in detail.
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| THP085 |
Transportation of the DTL/SDTL for the J-PARC
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782 |
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- T. Ito
JAEA/LINAC, Ibaraki-ken
- H. Asano, T. Morishita
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- Z. Kabeya, S. Kakizaki, K. Suzuki
MHI, Nagoya
- T. Kato, F. Naito, E. Takasaki, H. Tanaka, K. Yoshino
KEK, Ibaraki
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Three DTL tanks and 32 SDTL tanks for the Japan Proton Accelerator Research Complex (J-PARC) were assembled at KEK site. After the assembling, the aging of the DTL1 and 12 SDTL tanks and the beam acceleration test for the DTL1 was done. And then all the DTL and SDTL tanks have to be transported form KEK to JAEA. The distance is about 95km and special air suspension trailer is used. To confirm the effect to the accuracy of the drift tube alignment, we measured the displacement of the drift tube positions before and after the transportation by using a hot model tank. As a result of the test, the displacement of the drift tubes by the transportation was less than 0.02mm which meets our requirements. Based on this result, all the DTL and SDTL tanks were transported form KEK to JAEA. In this paper, the transportation results of the hot model tank and the DTL/SDTL tanks are described.
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| TUP067 |
Tune-up Scenario for Debuncher System in J-PARC L3BT
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406 |
| |
- M. Ikegami, H. Akikawa, Z. Igarashi, S. Lee
KEK, Ibaraki
- Y. Kondo
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- T. Morishita, S. Sato, T. Tomisawa, A. Ueno
JAEA/LINAC, Ibaraki-ken
- T. Ohkawa
JAEA, Ibaraki-ken
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We plan to start beam commissioning of J-PARC linac and the succeeding beam transport line in December 2006. The beam transport line, to which we refer as L3BT, has two key functionalities to satisfy the requirements for the succeeding ring injection. One is to reduce the momentum jitter and momentum spread, and the other is to scrape off the transverse tail. To realize the former functionality, a debuncher system is installed in L3BT which enables longitudinal gymnastics of the beam to reduce the momentum spread at the ring injection. In this presentation, the tune-up scenario for the debuncher system is presented together with simulation results on the effects of debuncher system.
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| TUP068 |
Tuning Strategy for Transverse Collimator in J-PARC L3BT
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409 |
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- M. Ikegami, H. Akikawa, S. Lee
KEK, Ibaraki
- H. Ao, T. Morishita, S. Sato, A. Ueno
JAEA/LINAC, Ibaraki-ken
- Y. Kondo
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- T. Ohkawa
JAEA, Ibaraki-ken
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We plan to start beam commissioning of J-PARC linac and the succeeding beam transport line in December 2006. The beam transport line, to which we refer as L3BT, has two key functionalities to satisfy the requirements for the succeeding ring injection. One is to reduce the momentum jitter and momentum spread, and the other is to scrape off the transverse tail. To realize the latter functionality, a transverse collimator system is installed in L3BT which consists of four horizontal and four vertical collimators. In this presentation, the tuning strategy for the transverse collimator system is presented together with the main features of the collimator system.
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| THP063 |
First High-Power ACS Module for J-PARC Linac
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725 |
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- H. Ao, K. Hasegawa, K. Hirano, T. Morishita, A. Ueno
JAEA/LINAC, Ibaraki-ken
- M. Ikegami
KEK, Ibaraki
- V. V. Paramonov
RAS/INR, Moscow
- Y. Yamazaki
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
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J-PARC 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 December 2006. It is planed to be upgraded by using 400-MeV ACS (Annular Coupled Structure), in a few years from the commissioning. The first high-power ACS module, which will be used as the first buncher between the SDTL and the ACS has been fabricated, and a few accelerating modules are also under fabrication until FY2006. Detail of cavity design and tuning procedure has been studied with RF simulation analysis and cold-model measurements. This paper describes RF measurement results, fabrication status, and related development items.
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