TJ-II: Calibration of the helical arrays of Mirnov coils

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Experimental campaign

Spring 2022

Proposal title

Calibration of the helical arrays of Mirnov coils

Name and affiliation of proponent

A. Cappa, E. Ascasibar, P. Pons

Details of contact person at LNF


Description of the activity

The calibration of the recently commissioned arrays of Mirnov coils has been performed by comparing the vacuum magnetic field of the standard configuration to the measurements of the integrated field obtained by each of the coils. Reproducibility is very good but only one magnetic configuration has been used and thus the calibration is sensitive to any error in the modelling of the theoretical field used for comparison. To ensure that this calibration, which is essential to correctly determine the mode numbers of the MHD perturbations, is correct, it is worthwhile to perform this exercise for different magnetic field distributions inside the device, either constructed by using other configurations or by preparing specific shots using the different CC, VF or HSX conductors separately. This proposal does not require the creation of plasma and can be executed at the beginning of a given day, before starting the plasma operation.

International or National funding project or entity

Include funding here (grants, national plans)

Description of required resources

Required resources:

  • Number of plasma discharges or days of operation: 5 shots with different field distributions
  • Essential diagnostic systems: Mirnov Coils
  • Type of plasmas (heating configuration): NO PLASMAS ARE REQUIRED
  • Specific requirements on wall conditioning if any: NO
  • External users: need a local computer account for data access: NO
  • Any external equipment to be integrated? Provide description and integration needs:NO

Preferred dates and degree of flexibility

Preferred dates: (format dd-mm-yyyy)


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