Seminars & Lectures
| * TITLE | Physical Processes in Nonlocal Thermal Transport in Plasmas | ||||||
|---|---|---|---|---|---|---|---|
| * SPEAKERS | |||||||
|
|||||||
| * HOST(Applicant) | |||||||
|
|||||||
| * DATE / TIME | 2005-07-18, 14:00 - 15:00 | ||||||
| * PLACE | Seminar Room #512, APCTP Headquarters | ||||||
| * ABSTRACT | |||||||
| Plasma energy transport is considered local when the mean free path of the charged particles is much shorter than the thermal gradient scale length. In this case the thermal flux is proportional to the temperature gradient. When these two scales become comparable the transport is nonlocal and an integral relation exists between the thermal flux and temperature which involves a convolution kernel. We have recently constructed an accurate kernel to describe the collisional transport and benchmarked it with particle and Fokker-Planck simulations. In addition to collisional transport in steep gradient plasmas there are also unstable ion acoustic fluctuations which can be driven by the heat flow and these act to suppress or inhibit the thermal energy transport. I will discuss these physical processes and show how they are important in diverse systems such as laser-plasma interactions and stellar atmospheres. |
|||||||
