Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7929763 | Optics Communications | 2015 | 5 Pages |
Abstract
In this paper, the interaction of high power laser with low density polymer foam with density as low as 2Â mg/cm3, 4Â mg/cm3, 20Â mg/cm3 30Â mg/cm3 and 50Â mg/cm3 targets are investigated and compared with solid polymer targets. An understanding of such interaction is important from fusion research point of view. Low density foam coating of fusion capsule has been proposed in order to smooth in direct drive scheme and also it is being used as efficient x-ray converter in indirect drive scheme. It is observed that about 75-80% of the laser energy is absorbed in the subcritical (with density <4Â mg/cm3) foam targets and the soft x-ray yield in this case is almost two times that measured in the over dense (supper critical) targets. The optical shadowgraphy of the targets shows that the laser coupling in low density foam is associated with a supersonic heat wave while, with increasing density this phenomenon is replaced by subsonic absorption and shock formation. In the case of a 50Â mg/cm3 foams the foil velocity reduced by 35% (i.e. 5Ã106Â cm/s), which further reduced to 3.8Ã106Â cm/s in case solid polymer targets.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
S. Chaurasia, P. Leshma, C.G. Murali, N.G. Borisenko, D.S. Munda, A. Orekhov, A.I. Gromov, Yu. A. Merkuliev, L.J. Dhareshwar,