| 研究課題/領域番号 |
19K03899
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| 研究機関 | 大学共同利用機関法人高エネルギー加速器研究機構 |
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研究代表者 |
SCHURY P.H 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 助教 (30462724)
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| 研究期間 (年度) |
2019-04-01 – 2023-03-31
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| キーワード | Ion source / Refractory elements / Photoionization |
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| 研究実績の概要 |
We have compiled most of the parts required. The UV LEDs and driving circuits are ready. The UV LED support and circuit boards are mostly designed.
A heavy machine time schedule combined with COVID-protocols limiting use of experimental halls continued to hamper assembly and testing. The discovery that the KISS gas cell-based ion cooler converts between 50% and 90% of ions delivered by KISS from singly charged to doubly charged ions lowered the priority of the development as well, as Rb and Cs thermal ions are generally able to be used as references. For future efforts in the trans-uranium region, however, such heavy reference species may still prove useful.
The UV LED ion source is now planned to be installed at the KISS MRTOF ion source chamber rather than the offline RF carpet test chamber that was originally planned to be used. The UV LED supports and circuit boards are being slightly redesigned to accommodate installation in this chamber. Following the KISS summer online machine schedule, the UV LEDs will be installed. Initial testing will be done by confirming that the UV illumination increases the yield from Cs thermal ion source presently installed. Following that, a tungsten filament will be installed in place of the thermal ion source and we will use the UV LEDs and MRTOF to attempt to identify tungsten isotope ions and perform mass measurements. It is still planned to use the system for systematic direct mass measurements of stable refractory elements.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
4: 遅れている
理由
A heavy machine time schedule combined with COVID-protocols limiting use of experimental halls continued to hamper assembly and testing. It has been now decided to test the device in the KISS MRTOF ion source chamber rather than the offline RF carpet test chamber for this reason. We anticipate first ions produced by end of August.
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| 今後の研究の推進方策 |
The UV LED ion source is now planned to be installed at the KISS MRTOF ion source chamber. The UV LED circuit boards are being slightly redesigned to accommodate installation in this chamber. Following the KISS summer online machine schedule, the UV LEDs will be installed. Initial testing will be to confirm the UV illumination increases the yield from Cs thermal ion source. Following that, a tungsten filament will be installed in place of the thermal ion source and we will use the UV LEDs and MRTOF to attempt to identify tungsten isotope ions and perform mass measurements.
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| 次年度使用額が生じた理由 |
We will still need to fabricate heat-wicking aluminium circuit boards for the UV LEDs. Depending on the observed efficacy when first testing occurs late this summer, we may also still need to purchase more LEDs. We also hope to be able, with an expected loosening of travel restrictions, to travel to present our work at some international conferences and to meet with colleagues in USA to discuss plans and possible extensions of this work.
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