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TJ-II:Searching for AEs suppression scenarios using off-axis ECCD: Difference between revisions
TJ-II:Searching for AEs suppression scenarios using off-axis ECCD (view source)
Revision as of 18:08, 20 January 2022
, 20 January 2022→Experimental plan
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Until now, only ECCD on-axis has been investigated. We will now try to modify the rotational transform profile by inducing ECCD off-axis with | Until now, only ECCD on-axis has been investigated. We will now try to modify the rotational transform profile by inducing ECCD off-axis with | ||
different levels of power at different plasma radius. The success of the proposal depends on whether or not the gyrotron that will be used to drive the current can be operated as shown in figure 1. To this end, previous tube conditionning sessions will be needed to ensure that the gyrotron can work with different levels of anode voltage in the same shot and thus deliver different levels of power. The heating power set-up shown in figure 1 will allow us to investigate the effect of ECCD using different combinations of ECH1 beam power and ECCD efficiency. | different levels of power at different plasma radius. The success of the proposal depends on whether or not the gyrotron that will be used to drive the current (ECH1) can be operated as shown in figure 1. To this end, previous tube conditionning sessions will be needed to ensure that the gyrotron can work with different levels of anode voltage in the same shot and thus deliver different levels of power. The heating power set-up shown in figure 1 will allow us to investigate the effect of ECCD using different combinations of ECH1 beam power and ECCD efficiency. | ||
With this set-up, ECH2 power (always with <math>n_{||}=0</math>) is used for start-up and density control in the NBI phase. Ideally, there should be no power in the first gyrotron until the central part of the NBI phase, in which the reference shot with <math>n_{||}=0</math> in ECH1 will be compared to the shots obtained by changing the injection directyion of ECH1. | With this set-up, ECH2 power (always with <math>n_{||}=0</math>) is used for start-up and density control in the NBI phase. Ideally, there should be no power in the first gyrotron until the central part of the NBI phase, in which the reference shot with <math>n_{||}=0</math> in ECH1 will be compared to the shots obtained by changing the injection directyion of ECH1. | ||