Development of a resonant laser ionization gas cell for high-energy, short-lived nuclei

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:295

Article

Sonoda, T.¹  Wada, M.¹  Tomita, H.^1,2  Sakamoto, C.^1,2  Takatsuka, T.^1,2  Furukawa, T.^1,3  Iimura, H.^1,4  Ito, Y.^1,5  Kubo, T.¹  Matsuo, Y.¹  Mita, H.^1,5  Naimi, S.¹  Nakamura, S.^1,5  Noto, T.^1,2  Schury, P.^1,5  Shinozuka, T.⁶  Wakui, T.⁶  Miyatake, H.⁷  Jeong, S.⁷  Ishiyama, H.⁷  Watanabe, Y. X.⁷  Hirayama, Y.⁷  Okada, K.^1,8  Takamine, A.^1,9 

[1] RIKEN, Nishina Ctr Accelerator Based Sci, Wako, Saitama 3510198, Japan

[2] Nagoya Univ, Fac Engn, Nagoya, Aichi 4648603, Japan

[3] Tokyo Metropolitan Univ, Dept Phys, Tokyo 1168551, Japan

[4] JAEA, Tokai 3191100, Japan

[5] Univ Tsukuba, Dept Phys, Tsukuba, Ibaraki 3058577, Japan

[6] Tohoku Univ, Ctr Cyclotron & Radioisotope, Sendai, Miyagi 9808578, Japan

[7] High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki 3050801, Japan

[8] Sophia Univ, Dept Phys, Chiyoda Ku, Tokyo 1028554, Japan

[9] Aoyama Gakuin Univ, Dept Phys, Shibuya Ku, Tokyo 1508366, Japan

关键词: Laser ion source;    Gas jet;    Resonant laser ionization;    Laser spectroscopy;   

DOI  :  10.1016/j.nimb.2012.10.009

来源: Elsevier

【 摘 要 】

A new laser ion source configuration based on resonant photoionization in a gas cell has been developed at RIBF RIKEN. This system is intended for the future PArasitic RI-beam production by Laser Ion-Source (PALIS) project which will be installed at RIKEN's fragment separator, BigRIPS. A novel implementation of differential pumping, in combination with a sextupole ion beam guide (SPIG), has been developed. A few small scroll pumps create a pressure difference from 1000 hPa-10(-3) Pa within a geometry drastically miniaturized compared to conventional systems. This system can utilize a large exit hole for fast evacuation times, minimizing the decay loss for short-lived nuclei during extraction from a buffer gas cell, while sufficient gas cell pressure is maintained for stopping high energy RI-beams. In spite of the motion in a dense pressure gradient, the photo-ionized ions inside the gas cell are ejected with an assisting force gas jet and successfully transported to a high-vacuum region via SPIG followed by a quadrupole mass separator. Observed behaviors agree with the results of gas flow and Monte Carlo simulations. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

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