Study of plasma density rise in U-3M after switching off RF-power Sample Clauses

Study of plasma density rise in U-3M after switching off RF-power. On torsatron U-3M the investigations of the nature of plasma density increase after RF heating termination were performed. In the confinement volume plasma was in the mode of rare collisions. With an average density measurements carried out using 2-mm interferometer, the size of the plasma column by optical methods, and microwave probing at frequencies near the plasma electron frequency, the change of plasma density profile during RF discharge and just after its termination was constructed. It was found that the time of plasma density rise after switching off the RF pulse coincides with the bootstrap current decay time. The value of plasma density increment after RF pulse end is proportional to the rate of the current decrease. As a result, it was supposed that one of the main mechanisms of plasma density increase after RF pulse switching off is the effect of pinching of particles trapped in the magnetic field inhomogeneities of torsatron configuration. Electric field, causing this pinching is associated with reducing bootstrap current. (V.K. Pashnev and others)
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