http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Characterization of an Intense Laser-Produced Preformed Plasma for Proton Generation
A Sagisaka,A. Noda,A. Fukumi,A. Yogo,A. S. Pirozhkov,H. Daido,K. Nemoto,K. Ogura,M. Nishiuchi,M. Mori,M. Kado,S. Orimo,S. Nakamura,T. Nayuki,T. Shirai,T. Fujii,Y. Oishi,Y. Hayashi,Y. Iwashita,Z. Li 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
High-energy protons are generated with a 3-μm-thick tantalum target irradiated with a highintensity laser under the preformed plasma condition. We observe the electron density distributions of preformed plasmas with two-color probe beams as interferometers. The preformed plasma at the front side of the target is generated by pre-pulses of a high-intensity Ti:sapphire laser. In this preformed plasma condition, the maximum proton enegy is 900 keV. The half angle of the generated proton beam (>500 keV) is about 10.
Yuusuke YAMAGUCHI,A. Fukuyama,H. Nakajima,H. Higaki,K. Nakagome,K. Nemoto,M. Katano,M. Ichimura,S. Kakimoto,T. Cho 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
A wide-band radio-frequency (RF) probe system was newly constructed for the active diagnostic of the eigenmode formations in the ion-cyclotron range of frequencies in the GAMMA 10 tandem mirror. A bar-type antenna was installed in the peripheral region in the minimum-B anchor cell. A low-power RF pulse with the frequency sweep from 8 to 20 MHz is applied to the antenna. The waves excited in the plasma are detected with a magnetic probe. The excitation of eigenmodes is described by using the antenna-plasma-probe transfer function. The transfer function can be obtained from the antenna current signal and the magnetic probe signal. When the real and the imaginary part of the transfer function are plotted in the complex plane, the resultant curves are approximately circles, indicating an eigenmode formation. It is found that the several fast wave eigenmodes can be excited in the present experimental condition.