Real-Time Density Feedback Control on the Aditya-U Tokamak
A single channel 100 GHz microwave interferometer system has been designed and installed in ADITYA-U tokamak for real time line integrated electron density measurement. It is validated for a number of plasma discharges. The real time density feedback control (RTDFC) system has been installed in the ADITYA-U Tokamak to achieve desired electron density. The RTDFC system consists of 100 GHz microwave interferometer system, FPGA based real time density estimation and feedback control system and gas fuelling control system. A proportional (P) controller is configured in voltage amplitude control mode to operate the piezo valve for gas fuel injection. Platform and profile density stability experiments have been performed during ADITYA-U plasma discharge. To overcome the decay on feedback action due to piezo stickiness, stick pulse is introduced before density feedback duration. This paper describes implementation of FPGA based RTDFC system and successfully validated during low shot duration plasma discharge in ADITYA-U. That consumes low power, cost-effective, re-programmable, easily upgraded and provides interlock with plasma parameters
Year of publication: |
[2022]
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Authors: | Patel, Kiran ; Nagora, Umesh ; Joshi, H.C ; Pathak, Surya ; Jadeja, K.A ; Patel, Kaushal ; Virani, Chetan ; Patel, Ankit ; Tanna, R. L. ; Kumar, Rohit ; Aich, Suman ; Ghosh, Joydeep |
Publisher: |
[S.l.] : SSRN |
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