Autor: |
Hiratsuka, Junichi, Kashiwagi, Mieko, Ichikawa, Masahiro, Umeda, Naotaka, mae quinones Saquilayan, Glynnis, Tobari, Hiroyuki, Watanabe, Kazuhiro, Kojima, Atsushi, Yoshida, Masafumi, Junichi, Hiratsuka, Mieko, Kashiwagi, Masahiro, Ichikawa, Naotaka, Umeda, Hiroyuki, Tobari, Kazuhiro, Watanabe, Atsushi, Kojima |
Jazyk: |
angličtina |
Rok vydání: |
2020 |
Předmět: |
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Zdroj: |
Review of Scientific Instruments. 91(023506):1-6 |
ISSN: |
0034-6748 |
Popis: |
Long pulse acceleration of hydrogen negative ion beams with the power density over 70 MW/m2 and the pulse length over 100 s has been demonstrated for the first time by using a multi-aperture 3-stage accelerator. Such long pulse acceleration was achieved by integrating the design of beam optics and voltage holding capability to meet the requirements of JT-60SA. By using the newly designed accelerator for JT60SA, voltage holding at 500 kV with beam acceleration was stably sustained even after 5 g of cesium was seeded, and heat load on each acceleration grid was reduced below the allowable level for long pulse, less than 5% of total acceleration power. As a result, 500 keV, 154 A/m2 for 118 s beam acceleration was achieved, which satisfies the requirement of the negative ion source for JT-60SA. This pulse length of such high-power density beams is longest in the world. In addition, the result contributes to the long pulse acceleration of multi-stage electrostatic accelerators, such as 1 MeV negative ion accelerator for ITER. |
Databáze: |
OpenAIRE |
Externí odkaz: |
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