Advances in surface ion suppression from RILIS: Towards the Time-of-Flight Laser Ion Source (ToF-LIS)

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• 作者：S. Rothe^a ; ^{sebastian.rothe@cern.ch" class="auth_mail" title="E-mail the corresponding author} ; R. Catherall^a ; B. Crepieux^a ; T. Day Goodacre^a ; ^b ; V.N. Fedosseev^a ; T. Giles^a ; B.A. Marsh^a ; J.P. Ramos^a ; ^c ; R.E. Rossel^a ; ^d ; ^e
• 关键词：RILIS ; Resonance laser ionization ; ISOLDE ; Ion source development
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2016
• 出版时间：1 June 2016
• 年：2016
• 卷：376
• 期：Complete
• 页码：86-90
• 全文大小：942 K

文摘

We present results from the development towards the Time-of-Flight Laser Ion Source (ToF-LIS) aiming for the suppression of isobaric contaminants through fast beam gating. The capability to characterize high resistance ion sources has been successfully demonstrated. A ninefold selectivity gain has been achieved through suppression of surface ionized potassium, while maintaining >90% transmission for laser-ionized gallium using a thin wall graphite ionizer cavity combined with a fast beam gate. Initial results from the investigation of glassy carbon as a potential hot cavity ion source are presented. Power-cycle tests of a newly designed mount for fragile ion source cavities indicates its capability to survive the thermal stress expected during operation in an ISOLDE target unit. Finally, we introduce fast ion beam switching at a rate of 10 kHz using the ISOLDE ion beam switchyard as a new concept for ion beam distribution and conclude by highlighting the potential applications of this ion beam multiplexing technique.