| Paper |
Title |
Page |
| MOPCH178 |
Tests on MgB2 for Application to SRF Cavities
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481 |
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- T. Tajima
LANL, Los Alamos, New Mexico
- I.E. Campisi
ORNL, Oak Ridge, Tennessee
- A. Canabal-Rey
NMSU, Las Cruces, New Mexico
- Y. Iwashita
Kyoto ICR, Uji, Kyoto
- B. Moeckly
STI, Santa Barbara, California
- C.D. Nantista, S.G. Tantawi
SLAC, Menlo Park, California
- H.L. Phillips
Jefferson Lab, Newport News, Virginia
- A.S. Romanenko
Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
- Y. Zhao
University of Wollongong, Institute of Superconducting and Electronic Materials, Wollongong
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Magnesium diboride (MgB2) has a transition temperature (Tc) of ~40 K, i.e., about four times higher than niobium (Nb). The studies in the last three years have shown that it could have about one order of magnitude less RF surface resistance (Rs) than Nb and seems much less power dependent compared to high-Tc materials such as YBCO. In this paper we will present results on the dependence of Rs on surface magnetic fields and possibly the critical RF surface magnetic field.
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| MOPLS088 |
Resonant Kicker System for Head-on-collision Option of Linear Collider
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759 |
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- Y. Iwashita
Kyoto ICR, Uji, Kyoto
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The separation of incoming and outgoing (electron and positron) beams at the interaction point of a linear collider is investigated using a resonant kicker system. It should enable head-on-collisions at the interaction point with the use of staggered passing times for each bunch at certain locations. Magnetic core materials for such a resonant kicker with a frequency of 6MHz are under investigation. Such a kicker system should minimize the perturbation of the incoming bunch with a finite bunch length, while it kicks the outgoing bunch by more than 1 millirad. Various arrangements of such kickers along the beamlines are discussed.
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| WEPLS056 |
R&D Status of the High-intense Monochromatic Low-energy Muon Source: PRISM
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2508 |
| |
- A. Sato, M. Aoki, Y. Arimoto, I. Itahashi, Y. Kuno, K. Kuriyama, T. Oki, T. Takayanagi, M. Yoshida
Osaka University, Osaka
- M. Aiba, C. Ohmori, T. Yokoi, K. Yoshimura
KEK, Ibaraki
- Y. Iwashita
Kyoto ICR, Uji, Kyoto
- S. Machida
CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
- Y. Mori
KURRI, Osaka
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PRISM is a project of a future intense low-energy muon source, which combines monochromaticity and high purity. Its aimed intensity is about $1011-1012 muons per second. The muon beams will have a low kinetic energy of 20MeV so that it would be optimized for the stopped muon experiments such as searching the muon lepton flavor violating processes. PRISM consists of a pion capture section, a pion/muon transfer section and a phase rotation ssection. An FFAG is used as the phase rotator to achieve the monochromatic muon beams. This paper will describe design status of these sections as well as construction status of PRISM-FFAG.
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| WEPLS073 |
A Super Strong Adjustable Permanent Magnet Quadrupole for the Final Focus in a Linear Collider
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2550 |
| |
- Y. Iwashita, T. Mihara
Kyoto ICR, Uji, Kyoto
- M. Kumada
NIRS, Chiba-shi
- C.M. Spencer
SLAC, Menlo Park, California
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An adjustable permanent magnet quadrupole has been fabricated to demonstrate its feasibility for use in the final focus of a linear collider. The supposed requirements for such a final focus lens are the tight stabilities of its integrated field gradient and magnetic center, plus it must have adjustable strength. The high temperature coefficient of the permanent magnet material NEOMAX is compensated by use of the MS-1 Fe-Ni alloy. The magnet has two concentric rings of NEOMAX. The replacement of the inner ring with a smaller diameter one is planned in order to reach the highest gradient with the current configuration of the quadrupole system; the system has to be scaled down in size to fit in a real linear collider final focus system. A precise magnetic field measurement system is also under fabrication that will be able to measure the magnetic center to a fraction of a micron.
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| THPCH155 |
High-quality Proton Beam Obtained by Combination of Phase Rotation and the Irradiation of the Intense Short-pulse Laser
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3158 |
| |
- S. Nakamura, Y. Iwashita, A. Noda, T. Shirai, H. Souda, H. Tongu
Kyoto ICR, Uji, Kyoto
- S. Bulanov, T. Esirkepov, Y. Hayashi, M. Kado, T. Kimura, M. Mori, A. Nagashima, M. Nishiuchi, K. Ogura, S. Orimo, A. Pirozhkov, A. Sagisaka, A. Yogo
JAEA, Ibaraki-ken
- H. Daido, A. Fukumi
JAEA/Kansai, Kizu-machi Souraku-gun Kyoto-fu
- Z. Li
NIRS, Chiba-shi
- A. Ogata, Y. Wada
HU/AdSM, Higashi-Hiroshima
- T. Tajima
JAEA/FEL, Ibaraki-ken
- T. Takeuchi
AEC, Chiba
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Ion production from laser-induced plasma has been paid attention because of its high acceleration gradient (>100GeV/m) compared with conventional RF accelerator. Its energy spectrum is Maxwell-Boltzmann distribution with high-energy cut-off, which limited its application. The phase rotation scheme, which rotates laser produced ions by an RF electric field synchronous to the pulse laser in the longitudinal phase space, was applied to proton beam up to 0.9MeV emitted from Ti foil with 3mm thickness irradiated by focused laser-pulse with peak intensity of 9 ´ 1017W/cm2. Multi-peaks with ~6% width (FWHM) were created and intensity multiplication up to 5 was attained around 0.6MeV region. The proton production process by the intense short-pulse laser has been optimized with use of time of flight measurement of proton beam detected by a plastic scintillation counter, which is specially shielded from the heavy background of electrons and X-rays induced by the intense laser. We have succeeded in on-line measurement of such a proton signal by the detector for the first time, which played an essential role for the investigation of phase rotation scheme.
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