| Paper |
Title |
Page |
| TUP011 |
Upgrade of Beam Diagnostics in LEBT and MEBT of J-PARC LINAC
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268 |
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- S. Sato, T. Tomisawa, A. Ueno
JAEA/LINAC, Ibaraki-ken
- H. Akikawa, Z. Igarashi, M. Ikegami, C. Kubota, S. Lee
KEK, Ibaraki
- Y. Kondo
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
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After tests in Tsukuba-site, Front end part (from an ion source upto the first drift tube linac) of J-PARC LINAC was transported to Tokai-site. From the coming December, testing with H- beam is planned. After the tests in Tsukuba, a few beam current monitors are added in the low and the medium energy transport line, and those monitors are used for the machine- and the person-protection system. In this paper, design and roles of each monitor are described.
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| TUP021 |
Wire Profile Monitors in J-PARC Linac
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293 |
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- H. Akikawa, Z. Igarashi, M. Ikegami, S. Lee
KEK, Ibaraki
- Y. Kondo
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- S. Sato, T. Tomisawa, A. Ueno
JAEA/LINAC, Ibaraki-ken
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We plan to install wire scanners for J-PARC linac in order to measure beam profile and emittance. They have been designed to capture electrons in H-, 7um-diameter carbon wires are used in 3MeV point and 30um-diameter tungsten wires are used for 50-181MeV point. We plan to set 36 wire scanners in linac and beam dumps. In this paper, we report the result of beam test with 3MeV beam at KEK and the calculation about signal and wire temperature.
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| TUP067 |
Tune-up Scenario for Debuncher System in J-PARC L3BT
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406 |
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- 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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| THP072 |
Fabrication and Low-Power Measurements of the J-PARC 50-mA RFQ Prototype
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749 |
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- Y. Kondo
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- K. Hasegawa
JAEA, Ibaraki-ken
- A. Ueno
JAEA/LINAC, Ibaraki-ken
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In the Japan Proton Accelerator Research Complex (J-PARC) project, the beam commissioning of the H- linac will be started with a 30mA peak current. A 30mA type RFQ, which is developed for the former Japan Hadorn Facility (JHF) project, is used for the day-1 operation. However, it is required to accomplish the peak current of 50mA as soon as possible. For this purpose, we have developed an RFQ for the 50mA peak current, which is a four vane type RFQ and resonant frequency of which is 324MHz, same as the 30mA RFQ. In the R&D of this RFQ, we have adopted laser welding to join oxygen free copper blocks to be a cavity structure. The heat load of the laser welding can be more localized than that of the brazing, and the copper is not annealed, therefore, we think, it is possible to obtain more mechanical accuracy. We have developed a longitudinally 1/3 prototype cavity of the J-PARC 50mA RFQ. In this cavity, the distortion of the vane tips is measured to be less than 30 micro-meters, and the field uniformity of within 1% is obtained in a low power measurement after tuning. In this paper, we discuss about the fabrication and the low power measurement of this prototype cavity.
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