234 / 2023-04-17 21:58:30

Improvement of the Specific Region Flux Diagnosis

惯性约束聚变物理学 > 惯性约束聚变物理学-海报

Hohlraums are widely used in indirect drive inertial confinment fusion (ICF). Through the laser entrance holes (LEHs), laser light are focused onto walls of the high-z hohlraum. X-rays are converted to compress and heat capsules in the center of the hohlraums. High-precision diagnostic of the radiation flux from the hohlraum is of great importance for the understanding of the indirect drive hohlraum energetics. Traditional method for the radiation flux diagnostic is to measure the escaping x-ray flux from the laser entrance holes with flat-response x-ray diode (FXRD) detectors or Dante spectrometers , and the components from the laser sopts and re-emitted area are combined to produce the measured signal. However, measurement of the radiation flux through LEHs is easily affected by the LEH shrinkage . Therefore, the space-resolving flux detector (SRFD) is developed. For the improvement of the aiming accuracy and the manipulation convenience, the space-resolving flux detector (SRFD) is upgraded into a compact diagnosis package, which is suitable to be mounted in the diagnostic instrument manipulator (DIM). By means of a Ce:GAGG cystal, radiation flux spatial distribution can be acquired on-line conveniently. The upgraded SRFD system is adopted for the measurement of the re-emitted flux from the sample at the center of a gas-filled cylindrical hohlraum. Consistent signals are obtained in repetitive shots and the absolute re-emitted flux is obtained taking consideration of the pattern of the pinhole and spatial intensity distribution of the x-ray source. The drive flux at the hohlraum center is obtained in combination with the measured re-emitted flux and radiation hydrodynamic simulations.