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Observation of high soft x-ray drive in large-scale hohlraums at the National Ignition Facility |
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| Authors: | Kline J L Glenzer S H Olson R E Suter L J Widmann K Callahan D A Dixit S N Thomas C A Hinkel D E Williams E A Moore A S Celeste J Dewald E Hsing W W Warrick A Atherton J Azevedo S Beeler R Berger R Conder A Divol L Haynam C A Kalantar D H Kauffman R Kyrala G A Kilkenny J Liebman J Le Pape S Larson D Meezan N B Michel P Moody J Rosen M D Schneider M B Van Wonterghem B Wallace R J Young B K Landen O L MacGowan B J |
| Affiliation: | Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. |
| Abstract: | The first soft x-ray radiation flux measurements from hohlraums using both a 96 and a 192 beam configuration at the National Ignition Facility have shown high x-ray conversion efficiencies of ～85%-90%. These experiments employed gold vacuum hohlraums, 6.4 mm long and 3.55 mm in diameter, heated with laser energies between 150-635 kJ. The hohlraums reached radiation temperatures of up to 340 eV. These hohlraums for the first time reached coronal plasma conditions sufficient for two-electron processes and coronal heat conduction to be important for determining the radiation drive. |
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