The TFTR 40 MW neutral beam injection system and DT operations

Stevenson, T. N.; O'Connor, T.; Garzotto, V.; Grisham, L.; Kamperschroer, J.; McCormack, B.; Newman, R.; Oldaker, M.; Ramakrishnan, S.; Halle, A. von; Wright, Kathryn

doi:10.1109/fusion.1995.534278

Cited by 13 publications

(2 citation statements)

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“…In the translational or Motional Stark Effect the electric field is caused by the v × B electric field (Lorentz electric field) appearing in the rest frame of an atom moving with the velocity v through a magnetic field B. In fusion research powerful neutral heating beams, using hydrogen or its isotopes deuterium (and in a few cases at TFTR and JET also tritium [19,20]), or dedicated diagnostic beams with high power densities have facilitated the development of MSE diagnostics. With beam energies of the order of 100 keV and magnetic fields of several Tesla, |E L | lies in the range of 10 6 to 10 7 V/m.…”

Section: Motional Stark Effectmentioning

confidence: 99%

Motional Stark Effect measurements of the local magnetic field in high temperature fusion plasmas

et al. 2015

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The utilization of the Motional Stark Effect (MSE) experienced by the neutral hydrogen or deuterium injected into magnetically confined high temperature plasmas is a well established technique to infer the internal magnetic field distribution of fusion experiments. In their rest frame, the neutral atoms experience a Lorentz electric field, E L = v × B, which results in a characteristic line splitting and polarized line emission. The different properties of the Stark multiplet allow inferring, both the magnetic field strength and the orientation of the magnetic field vector. Besides recording the full MSE spectrum, several types of polarimeters have been developed to measure the polarization direction of the Stark line emission. To test physics models of the magnetic field distribution and dynamics, the accuracy requirements are quite demanding. In view of these requirements, the capabilities and issues of the different techniques are discussed, including the influence of the Zeeman Effect and the sensitivity to radial electric fields. A newly developed Imaging MSE system, which has been tested on the ASDEX Upgrade tokamak, is presented. The sensitivity allows to resolve sawtooth oscillations.

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Section: Motional Stark Effectmentioning

confidence: 99%

Motional Stark Effect measurements of the local magnetic field in high temperature fusion plasmas

et al. 2015

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“…This 5.95 million dollar upgrade reused a previous generation injector and equipment for technical, cost, and schedule reasons to obtain these specifications while retaining a legacy capability of 120 keV neutral particle beam delivery for shorter pulse lengths for possible future NSTX experiments [1]. Concerns with NBI injection included power deposition in the plasma, aiming angles from the fixed NBI fan array, density profiles and beam shinethrough, orbit losses of beam particles, and protection of the vacuum vessel wall against beam impingement.…”

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confidence: 99%