Volume 94, Number 3, May 2011
|Number of page(s)||6|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||27 April 2011|
Illumination stability for high-repetition-rate laser facilities in direct-drive inertial confinement fusion
Dipartimento SBAI, Università degli Studi di Roma “La Sapienza” and CNISM - via A. Scarpa 14, 00161, Roma, Italy, EU
Accepted: 1 April 2011
The illumination uniformity of a spherical target is of fundamental importance in direct-drive inertial confinement fusion. The laser intensity asymmetry is studied here using numerical calculations, taking into account target positioning errors and laser system shot-to-shot fluctuations. The optimisation of a laser beam configuration is outlined on the basis of a statistical analysis of the illumination uniformity using three independent selection criteria. The particular case of a 48-beam laser facility is discussed in detail. It is found that the fluctuation of the illumination asymmetry is a key parameter for assessing the stability of operation in high-repetition-rate mode. Moreover the target positioning error arising from the injection system could be the dominant source of illumination asymmetry in a fusion reactor.
PACS: 52.57.-z – Laser inertial confinement / 52.57.Fg – Implosion symmetry and hydrodynamic instability (Rayleigh-Taylor, Richtmyer-Meshkov, imprint, etc.) / 42.60.Jf – Beam characteristics: profile, intensity, and power; spatial pattern formation
© EPLA, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.