Investigation of the breakdown temperature in capillary discharge plasmas

We developed a simple way to estimate the breakdown temperature TbTb of plasma electrons in a capillary, which is based on measurement of the electrical breakdown voltage VbVb. The result shows that the breakdown temperature TbTb decreases with increasing pressure. The thermal equilibrium electron temperature TeTe in the capillary plasma after the electrical discharge is also measured by using the optical emission spectroscopy method.