| 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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| MOPCH179 |
Design of a New Electropolishing System for SRF Cavities
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484 |
| |
- T. Tajima
LANL, Los Alamos, New Mexico
- C. Boffo
Fermilab, Batavia, Illinois
- M.P. Kelly
ANL, Argonne, Illinois
- J. Mammosser
Jefferson Lab, Newport News, Virginia
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Electropolishing (EP) is considered the baseline surface treatment for Superconducting RF (SRF) cavities to achieve >35 MV/m accelerating gradient for the International Linear Collider (ILC). Based on the lessons learned at the forerunners such as KEK/Nomura, DESY and JLAB and on the recent studies, we have started a new design of the next EP system that will be installed in the US. This paper presents requirements, specifications, and the detail of the system design as well as the path forward towards the future industrialization.
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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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