中文摘要：

<正> Transient process of ECR startup in SUNIST is analyzed and simulated in a onedimensionalmodel.Contributions from the generation,drift,diffusion and loss of electrons aretaken into account in the model and estimated from experimental parameters,e.g.,toroidal field,vertical field and gas filling pressure.Typical discharges are simulated with the conditions closeto the experimental ones.Experimental and simulated results are comparable qualitatively inamplitudes and semi-quantitatively in time.From the results it is confirmed that the transientprocess of ECR startup in SUNIST is dominated,as preliminarily deduced from experimentalobservations,by a pair of exclusive factors,namely the absorption,due to gas ionization,and thereflection of microwave,caused by the shift of over dense plasmas due to outward E×B drift.Inaddition to these two factors,electron loss along the field line is also very important in determiningthe character of discharges.

英文摘要：

Transient process of ECR startup in SUNIST is analyzed and simulated in a one- dimensional model. Contributions from the generation, drift, diffusion and loss of electrons are taken into account in the model and estimated from experimental parameters, e.g., toroidal field, vertical field and gas filling pressure. Typical discharges are simulated with the conditions close to the experimental ones. Experimental and simulated results are comparable qualitatively in amplitudes and semi-quantitatively in time. From the results it is confirmed that the transient process of ECR startup ill SUNIST is dominated, as preliminarily deduced from experimental observations, by a pair of exclusive factors, namely the absorption, due to gas ionization, and the reflection of microwave, caused by the shift of over dense plasmas due to outward E x B drift. In addition to these two factors, electron loss along the field line is also very important in determining the character of discharges.