Ohmic Density Limit on HL-1M Tokamak

Abstract

Investigations on density limit have been performed under a variety of discharge conditions on HL-1M, which include hydrogen isotope, siliconized wall coating and a variety of fuelling methods (gas puff, pellet and supersonic molecular beam (SMB) injection). Detailed analysis shows that the HL-1M density limit is a disruptive limit and related to first wall recirculating and fuelling methods. The destruction of the balance between radiation and input power is the main reason for the density disruption.

Study of LHCD in HL-2A Non-Circular Cross Section Tokamak

“…Because the n // value is small at the plasma center and large at the plasma edge, a high density will cause a hollow driven current profile. Calculations show that thgh B t and high wave frequency are preferable for current drive [14]…”

“…The ray tracing can be described by the cold plasma model, and the thermal effect is relatedto the wave power deposition. In view of current drive, a higher plasma temperature is preferable and a high plasma density will cause a larger change in n // [1,12,13,14] (see Fig. 3).…”