Kanesue Takeshi, Tamura Jun, Okamura Masahiro
Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Fukuoka, Japan.
Rev Sci Instrum. 2008 Feb;79(2 Pt 2):02B102. doi: 10.1063/1.2838223.
Charge state 1+ions are required as a primary ion source for Relativistic Heavy Ion Collider-electron beam ion source (RHIC-EBIS) at BNL and laser ion source (LIS) is a candidate as one of the external ion source since low energy and low charge state ions can be generated by lower power density laser irradiation onto solid target surface. Plasma properties of (27)Al, (56)Fe, and (181)Ta using the second harmonics of Nd:yttrium aluminum garnet laser (0.73 J5.5 ns and 532 nm wavelength) for low charge state ion generation was measured. Charge state distribution of Ta was optimized for 1+with estimated laser power density of 9.1 x 10(8) Wcm(2) on the target. It has been shown that the LIS can produce sufficient ion charge with the appropriate pulse structure to satisfy injection requirements of the RHIC EBIS.
对于布鲁克海文国家实验室（BNL）的相对论重离子对撞机电子束离子源（RHIC-EBIS）而言，需要1+电荷态离子作为初级离子源，并且激光离子源（LIS）作为外部离子源之一是个候选，因为通过低功率密度激光照射固体靶表面能够产生低能量和低电荷态离子。利用钕钇铝石榴石激光的二次谐波（波长532nm，能量0.73J，脉宽5.5ns）测量了用于产生低电荷态离子的（27）Al、（56）Fe和（181）Ta的等离子体特性。在靶上估计激光功率密度为9.1×10（8）W/cm（2）的情况下，对Ta的电荷态分布进行了优化以获得1+电荷态。结果表明，激光离子源能够产生具有适当脉冲结构的足够离子电荷，以满足RHIC EBIS的注入要求。
