Superluminal sheath-field expansion and fast-electron-beam divergence measurements in laser-solid interactions.
We show that including a sufficient description of the target's rear surface significantly affects the interpretation of a wide range of laser-solid experiments. A simple Debye sheath model will be shown to be adequate. From this the sheath field responsible for ion acceleration has been shown...
| Հիմնական հեղինակներ: | , , , , |
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| Ձևաչափ: | Journal article |
| Լեզու: | English |
| Հրապարակվել է: |
2011
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| _version_ | 1826291427232972800 |
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| author | Ridgers, C Sherlock, M Evans, R Robinson, A Kingham, R |
| author_facet | Ridgers, C Sherlock, M Evans, R Robinson, A Kingham, R |
| author_sort | Ridgers, C |
| collection | OXFORD |
| description | We show that including a sufficient description of the target's rear surface significantly affects the interpretation of a wide range of laser-solid experiments. A simple Debye sheath model will be shown to be adequate. From this the sheath field responsible for ion acceleration has been shown to expand at superluminal speeds, leading to very large ion-emission regions on the target's rear surface; a new explanation for the dynamics of the ion-accelerating sheath field accounts for this observation and demonstrates the inaccuracy of measuring the angular divergence of the injected electron beam, crucial to fast ignition, from the lateral extent of the ion emission. However, it is shown that on careful probing the sheath field can provide unique insight into details of the fast electron's distribution function. The relative merits of probing other physical quantities has been examined. The width of the background temperature spot overestimates the divergence by a factor of 2 unless electron recirculation is prevented. |
| first_indexed | 2024-03-07T02:59:13Z |
| format | Journal article |
| id | oxford-uuid:b05f7bfd-c1b1-4d2e-a5b1-5c046c34ddf4 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:59:13Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:b05f7bfd-c1b1-4d2e-a5b1-5c046c34ddf42022-03-27T03:56:00ZSuperluminal sheath-field expansion and fast-electron-beam divergence measurements in laser-solid interactions.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b05f7bfd-c1b1-4d2e-a5b1-5c046c34ddf4EnglishSymplectic Elements at Oxford2011Ridgers, CSherlock, MEvans, RRobinson, AKingham, RWe show that including a sufficient description of the target's rear surface significantly affects the interpretation of a wide range of laser-solid experiments. A simple Debye sheath model will be shown to be adequate. From this the sheath field responsible for ion acceleration has been shown to expand at superluminal speeds, leading to very large ion-emission regions on the target's rear surface; a new explanation for the dynamics of the ion-accelerating sheath field accounts for this observation and demonstrates the inaccuracy of measuring the angular divergence of the injected electron beam, crucial to fast ignition, from the lateral extent of the ion emission. However, it is shown that on careful probing the sheath field can provide unique insight into details of the fast electron's distribution function. The relative merits of probing other physical quantities has been examined. The width of the background temperature spot overestimates the divergence by a factor of 2 unless electron recirculation is prevented. |
| spellingShingle | Ridgers, C Sherlock, M Evans, R Robinson, A Kingham, R Superluminal sheath-field expansion and fast-electron-beam divergence measurements in laser-solid interactions. |
| title | Superluminal sheath-field expansion and fast-electron-beam divergence measurements in laser-solid interactions. |
| title_full | Superluminal sheath-field expansion and fast-electron-beam divergence measurements in laser-solid interactions. |
| title_fullStr | Superluminal sheath-field expansion and fast-electron-beam divergence measurements in laser-solid interactions. |
| title_full_unstemmed | Superluminal sheath-field expansion and fast-electron-beam divergence measurements in laser-solid interactions. |
| title_short | Superluminal sheath-field expansion and fast-electron-beam divergence measurements in laser-solid interactions. |
| title_sort | superluminal sheath field expansion and fast electron beam divergence measurements in laser solid interactions |
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