Conditions for Radiative Cooling and Collapse in the Plasma Focus Illustrated With Numerical Experiments on PF1000
Reduced Pease–Braginskii currents are estimated for a linear pinch in a range of gases, namely, D, He, Ne, Ar, Kr, and Xe. A characteristic depletion time is defined as the time it takes for the plasma focus (PF) pinch energy to be radiated away. This quantity is used as an indicator for expecta...
محفوظ في:
| المؤلفون الرئيسيون: | , , , , , , |
|---|---|
| التنسيق: | مقال |
| منشور في: |
IEEE
2016
|
| الموضوعات: | |
| الوصول للمادة أونلاين: | http://eprints.intimal.edu.my/321/ http://ieeexplore.ieee.org/document/7336543/ |
| الوسوم: |
إضافة وسم
لا توجد وسوم, كن أول من يضع وسما على هذه التسجيلة!
|
| الملخص: | Reduced Pease–Braginskii currents are estimated
for a linear pinch in a range of gases, namely, D, He, Ne, Ar, Kr,
and Xe. A characteristic depletion time is defined as the time it
takes for the plasma focus (PF) pinch energy to be radiated away.
This quantity is used as an indicator for expectation of radiative
collapse. The depletion times in various gases are estimated in
units of pinch duration. The values indicate that in D and He,
the radiation powers are small, resulting in such long depletion
times that no radiative collapse may be expected in the lifetime
of the focus pinch. In Ne, low tens of percent are radiated
and significant cooling and reduction in radius ratio may be
anticipated. In Ar, Kr, and Xe, the depletion time is only a
fraction of the estimated pinch duration, so radiative collapse
may be expected. Numerical experiments are then carried out
with a circuit-coupled code, which incorporates radiation-coupled
dynamics with PF pinch elongation and plasma self-absorption.
The latter eventually limits the radiated power and stops the
radiative collapse. These results show the detailed dynamics and
confirm the expectations arising from depletion times discussed
above. |
|---|