Speaker
Description
Electron-beam-driven RI separator for SCRIT (ERIS) [1] is dedicated to produce a high-quality and low-energy radioisotope (RI) beam for the SCRIT (Self-Confinement RI Target) electron scattering facility [2] at the RIKEN RI Beam Factory. Electron scattering is one of the useful ways to accurately understand the internal structure of atomic nuclei. The aim of this facility is realization of electron scattering experiment with unstable nuclei, for which the target nuclei of $10^8$ ions/s are required. Recently, although the yield of $^{137}$Cs was $10^7$ ion/pulse, we successfully performed world’s first elastic electron scattering experiment with $^{137}$Cs [3].
Our next plan is to perform the electron scattering experiment with $^{132}$Sn. $^{132}$Sn beams are produced by using the forced electron beam induced arc discharge (FEBIAD) ion source at ERIS. The present yields of $^{132}$Sn are achieved to $2.6 \times 10^5$ ions/s with 15-g uranium targets and a 10-W electron beam [4]. To supply the required beam intensity, the overall efficiency of the ion source needs to be increased as well as increasing the electron-beam power. One of the developments is to improve extraction efficiency of ion beam from the ion source. Thus, we are considering a new structure of ionization chamber using SIMION [5]. Currently, the simulation is in the process of studying the details based on the effects of space charge and other factors.
In this contribution, we will report about simulation of FEBIAD ion source at ERIS.
References
[1] T. Ohnishi et al., Nulc. Instrum. Methods Phys, Res. B 317 (2013) 357.
[2] M. Wakasugi et al., Nucl. Instrum. Methods Phys. Res. B 317 (2013) 668.
[3] K. Tsukada et al., Phys. Rev. Lett. 131 (2023) 092502.
[4] T. Ohnishi et al., Proceedings of HIAT2015, Yokohama, Japan, WEPB02 (2015).
[5] https://simion.com/
| Email address | abey@riken.jp |
|---|---|
| Classification | Isotope production, target, and ion source techniques |
