| Paper |
Title |
Page |
| TUP06 |
Results of the High-Power Conditioning and the First Beam Acceleration of the DTL-1 for J-PARC
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300 |
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- 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
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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.
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| TUP83 |
Results of the Magnetic Field Measurements of the DTL Quadrupole Magnets for the J-PARC
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468 |
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- E. Takasaki, F. Naito, H. Tanaka, K. Yoshino
KEK, Ibaraki
- H. Ino, Z. Kabeya, S. Kakizaki, T. Kawasumi
Mitsubishi Heavy Industries Ltd., Nagoya Aerospace Systems Works, Nagoya
- T. Itou
JAERI/LINAC, Ibaraki-ken
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A quadrupole electromagnet is installed in the drift tube, which has an outer diameter of 140 mm and its minimum length of 53 mm. Hence, a coil of this magnet was made by the advanced periodic reverse copper electroforming method instead of the conventional hollow conductor. Recently, 149 quadrupole electromagnets were completed and then installed in the drift tube within a high accuracy. The magnetic field measurements have been carried out with two different measurement methods at each stage of the manufacturing process. The discrepancies between the magnetic field center and the mechanical center are within about ±35 μm after installation of the quadrupole magnet inside the drift tube. This paper will describe methods and results of the magnetic field measurements.
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| TUP85 |
J-PARC Linac Alignment
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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
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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.
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| TUP87 |
Technologies of The Peripheral Equipments of The J-PARC DTL1 for the Beam Test
|
480 |
| |
- K. Yoshino, Y. Fukui, E. Kadokura, T. Kato, C. Kubota, F. Naito, E. Takasaki, H. Tanaka
KEK, Ibaraki
- T. Itou
JAERI/LINAC, Ibaraki-ken
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First beam test of the DTL1 was performed in November of 2003 at KEK site. A 30 mA H- beam was successfully accelerated from 3 to 19.7 MeV. In order to prepare the beam test, various peripheral equipments were developed: the electrode plates for connecting the hollow-conductor coil and the power cable were developed since quadrupole electromagnets are built in all DTs (77 sets) of the DTL1, the water-cooled multiconductor copper tube (Control Copper Tube) were used as the power cable from the electrode plate to power supply, and the interlock system assembled by PLCs (Programmable Logic Controller) was also prepared for the surveillance of many cooling channel.
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| THP89 |
Measured RF Properties of the DTL for the J-PARC
|
809 |
| |
- H. Tanaka, T. Kato, F. Naito, E. Takasaki
KEK, Ibaraki
- H. Asano, T. Morishita
JAERI, Ibaraki-ken
- T. Itou
JAERI/LINAC, Ibaraki-ken
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RF properties of the second DTL tank for J-PARC have been measured in KEK. The required flatness and stability of the accelerating field of the tank have been achieved by the tunung of the post-couplers, whose shape were modified to adjust the resonant frequency ?324 MHz). Because the third DTL tank has assembled, the rf measurement and the post-coupler tuning will be started soon. Thus the measured results for both tanks will be described in the paper.
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