Influence of magnetic field strength on the focusing properties of a high-current plasma lens
We present results of experimental studies of the operation of the high-current wide-aperture plasma lens in the range of low magnetic fields. Investigations of focusing of copper and carbon ion beams with current up to 0,5 A and energy up to 20 keV by a plasma lens with aperture ~7 cm were conducte...
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| Опубліковано в: : | Вопросы атомной науки и техники |
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| Дата: | 2000 |
| Автори: | , , , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Національний науковий центр «Харківський фізико-технічний інститут» НАН України
2000
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/78545 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Influence of magnetic field strength on the focusing properties of a high-current plasma lens / A.A. Goncharov, S.M. Gubarev, I.M. Protsenko, I. Brown // Вопросы атомной науки и техники. — 2000. — № 6. — С. 124-127. — Бібліогр.: 5 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862731506317787136 |
|---|---|
| author | Goncharov, A.A. Gubarev, S.M. Protsenko, I.M. Brown, I. |
| author_facet | Goncharov, A.A. Gubarev, S.M. Protsenko, I.M. Brown, I. |
| citation_txt | Influence of magnetic field strength on the focusing properties of a high-current plasma lens / A.A. Goncharov, S.M. Gubarev, I.M. Protsenko, I. Brown // Вопросы атомной науки и техники. — 2000. — № 6. — С. 124-127. — Бібліогр.: 5 назв. — англ. |
| collection | DSpace DC |
| container_title | Вопросы атомной науки и техники |
| description | We present results of experimental studies of the operation of the high-current wide-aperture plasma lens in the range of low magnetic fields. Investigations of focusing of copper and carbon ion beams with current up to 0,5 A and energy up to 20 keV by a plasma lens with aperture ~7 cm were conducted in Kiev; studies of focusing of tantalum, copper, zinc and carbon ion beams with current up to 0,5 A and energy up to 50 keV were studied in Berkeley. In both cases ion beams were produced by a vacuum-arc (MEVVA-type) ion source. Substantial increase of the beam current density at the focus of the lens was found for low magnitudes of the magnetic fields. A maximum in beam current density is observed for magnetic fields 5-16 kA/m, in a notably narrow range. The optimal magnetic field increases with increasing voltage applied to the lens. For a copper ion beam the optimal current density reaches ~250 mA/cm2, then drops by a factor 3-4 with increasing magnetic field, after which it grows again and reaches a saturation value ~120 mA/cm2 for magnetic fields exceeding 40 kA/m. The effect is observed for different distributions of the external potential of the lens electrodes. Measurement of the radial distribution of potential in the mid-plane of the lens reveals a self-consistent optimal electric field topography with minimal spherical aberrations. It is observed also in the optimum case, a drastic decrease (by a factor of more than an order of magnitude) in the amplitude of oscillations in the lens and focused ion beam. A decrease of the halfwidth of the ion beam at the lens focus is also observed.
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| first_indexed | 2025-12-07T19:27:08Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-78545 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1562-6016 |
| language | English |
| last_indexed | 2025-12-07T19:27:08Z |
| publishDate | 2000 |
| publisher | Національний науковий центр «Харківський фізико-технічний інститут» НАН України |
| record_format | dspace |
| spelling | Goncharov, A.A. Gubarev, S.M. Protsenko, I.M. Brown, I. 2015-03-18T18:44:50Z 2015-03-18T18:44:50Z 2000 Influence of magnetic field strength on the focusing properties of a high-current plasma lens / A.A. Goncharov, S.M. Gubarev, I.M. Protsenko, I. Brown // Вопросы атомной науки и техники. — 2000. — № 6. — С. 124-127. — Бібліогр.: 5 назв. — англ. 1562-6016 https://nasplib.isofts.kiev.ua/handle/123456789/78545 533.9 We present results of experimental studies of the operation of the high-current wide-aperture plasma lens in the range of low magnetic fields. Investigations of focusing of copper and carbon ion beams with current up to 0,5 A and energy up to 20 keV by a plasma lens with aperture ~7 cm were conducted in Kiev; studies of focusing of tantalum, copper, zinc and carbon ion beams with current up to 0,5 A and energy up to 50 keV were studied in Berkeley. In both cases ion beams were produced by a vacuum-arc (MEVVA-type) ion source. Substantial increase of the beam current density at the focus of the lens was found for low magnitudes of the magnetic fields. A maximum in beam current density is observed for magnetic fields 5-16 kA/m, in a notably narrow range. The optimal magnetic field increases with increasing voltage applied to the lens. For a copper ion beam the optimal current density reaches ~250 mA/cm2, then drops by a factor 3-4 with increasing magnetic field, after which it grows again and reaches a saturation value ~120 mA/cm2 for magnetic fields exceeding 40 kA/m. The effect is observed for different distributions of the external potential of the lens electrodes. Measurement of the radial distribution of potential in the mid-plane of the lens reveals a self-consistent optimal electric field topography with minimal spherical aberrations. It is observed also in the optimum case, a drastic decrease (by a factor of more than an order of magnitude) in the amplitude of oscillations in the lens and focused ion beam. A decrease of the halfwidth of the ion beam at the lens focus is also observed. This work was supported by the Ministry of Science and Technology of Ukraine (project #2.4/705 and #2.5.2/10). en Національний науковий центр «Харківський фізико-технічний інститут» НАН України Вопросы атомной науки и техники Вeams and waves in plasma Influence of magnetic field strength on the focusing properties of a high-current plasma lens Article published earlier |
| spellingShingle | Influence of magnetic field strength on the focusing properties of a high-current plasma lens Goncharov, A.A. Gubarev, S.M. Protsenko, I.M. Brown, I. Вeams and waves in plasma |
| title | Influence of magnetic field strength on the focusing properties of a high-current plasma lens |
| title_full | Influence of magnetic field strength on the focusing properties of a high-current plasma lens |
| title_fullStr | Influence of magnetic field strength on the focusing properties of a high-current plasma lens |
| title_full_unstemmed | Influence of magnetic field strength on the focusing properties of a high-current plasma lens |
| title_short | Influence of magnetic field strength on the focusing properties of a high-current plasma lens |
| title_sort | influence of magnetic field strength on the focusing properties of a high-current plasma lens |
| topic | Вeams and waves in plasma |
| topic_facet | Вeams and waves in plasma |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/78545 |
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