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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 18:03, 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 | 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. | ||
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, launching ECH2 power with <math>n_{||}=0</math> , only a small amount of ECCD current will be induced by the | With this set-up, launching ECH2 power with <math>n_{||}=0</math> , only a small amount of ECCD current will be induced by the | ||
ECH1 beam during the ECRH phase while the larger amount of ECCD will be induced during the NBI phase by increasing the ECH1 beam power. For stability purposes ECH1 must be working at low power from the begginning of the shot until higher power is requested. | ECH1 beam during the ECRH phase while the larger amount of ECCD will be induced during the NBI phase by increasing the ECH1 beam power. For stability purposes ECH1 must be working at low power from the begginning of the shot until higher power is requested. | ||