A differential method for real time measurements of the diamagnetic energy and poloidal β has been successfully installed on the Tore Supra tokamak. This diagnostic makes use of concentric diamagnetic loops compensated by precise measurements of toroidal current variations. This diamagnetic measurement is now routinely used in the feedback system to control the internal inductance of the Tore Supra plasma using non-inductive current drive generated by lower hybrid waves.
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Joffrin et al. (2002) studied this question.
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