Development of a resonant laser ionization gas cell for high-energy, short-lived nuclei
Abstract
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.
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Cite
@article{arxiv.1210.6483,
title = {Development of a resonant laser ionization gas cell for high-energy, short-lived nuclei},
author = {T. Sonoda and M. Wada and H. Tomita and C. Sakamoto and T. Takatsuka and T. Furukawa and H. Iimura and Y. Ito and T. Kubo and Y. Matsuo and H. Mita and S. Naimi and S. Nakamura and T. Noto and P. Schury and T. Shinozuka and T. Wakui and H. Miyatake and S. Jeong and H. Ishiyama and Y. X. Watanabe and Y. Hirayama and K. Okada and A. Takamine},
journal= {arXiv preprint arXiv:1210.6483},
year = {2015}
}