Technical and Scientific Aspects of the JET Trace-Tritium Experimental Campaign

Jones, Timothy; Brennan, D. P.; Pearce, R.; Stork, D.; Zastrow, K.‐D.; Balshaw, N.; Bell, A.C.; Bertalot, L.; Boyer, H.; Butcher, P.; Challis, C.; Ćirić, D.; Clarke, Richard H.; Conroy, S.; Darke, A.; Davies, N.; Edlington, T.; Ericsson, Göran; Gibbons, C.; Hackett, L.; Haupt, T.; Hitchin, M; Kaye, A.; King, R.; Kiptily, V.; Knipe, S.; Lawrence, G.P.; Lobel, Ruben; Mason, Allen S.; Morgan, P. D.; Patel, B.; Popovichev, S.; Stamp, M.; Surrey, E.; Terrington, A; Worth, L.; Young, D.

doi:10.13182/fst05-a922

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Tritium can be introduced into the JET tokamak by short, 80 ms T 2 gas puffs of up to 6 mg using a piezo-crystal valve (Jones et al 2004). The amount that is puffed is measured by the pressure drop in the reservoir of the valve.…”

Section: Experimental Technique and Analysis Methodsmentioning

confidence: 99%

“…We have performed tritium transport studies in all ITER operational regimes as part of the 2003 JET trace tritium experiment (TTE) (Jones et al 2004). We studied ELMy H-mode plasmas, hybrid scenario discharges (Joffrin et al 2002) and weak and strong internal transport barrier (ITB) discharges (see Wolf (2003), Connor et al (2004) for recent reviews) in dedicated experiments.…”

Section: Introductionmentioning

confidence: 99%

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Tritium transport experiments on the JET tokamak

Zastrow

Adams²,

Baranov³

et al. 2004

Plasma Phys. Control. Fusion

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An overview is given of the experimental method, the analysis technique and the results for trace tritium experiments conducted on the JET tokamak in 2003. Observations associated with events such as sawtooth collapses, neo-classical tearing modes and edge localized modes are described. Tritium transport is seen to approach neo-classical levels in the plasma core at high density and low q 95 , and in the transport barrier region of internal transport barrier (ITB) discharges. Tritium transport remains well above neo-classical levels in all other cases. The correlation of the measured tritium diffusion coefficient and convection velocity for normalized minor radii r/a = [0.65, 0.80] with the controllable parameters q 95 and plasma density are found to be consistent for all operational regimes (ELMy H-mode discharges with or without ion cyclotron frequency resonance heating, hybrid scenario and ITB discharges). Scaling with local physics parameters is best described by gyro-Bohm scaling with an additional inverse beta dependence.

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Section: Experimental Technique and Analysis Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tritium transport experiments on the JET tokamak

Zastrow

Adams²,

Baranov³

et al. 2004

Plasma Phys. Control. Fusion

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“…In these experiments tritium has been introduced into the JET tokamak by short, 80 ms T 2 gas puffs of up to 5 mg using a piezo-crystal valve (GIM 15) [6] located in the neutral beam injection line in Octant 6. The quantity of injected tritium was maintained at very low levels (less than 1% of D) in order to keep the DT fusion rate low and the decontamination time of the vessel short.…”

Section: Experiments and Spectroscopic Backgroundmentioning

confidence: 99%

Molecular (H/D/T) sources in JET

Pospieszczyk

Brezinsek

Meigs

et al. 2007

Journal of Nuclear Materials

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Molecular Fulcher-a spectroscopy is used for the investigation of the HD and DT molecule formation in JET during H 2 and T 2 puffs, respectively. In the hydrogen case, the HD fraction in the outer divertor was about 10% of the molecular D 2 flux, resulting in a 1% contribution of H 2 to the D 2 flux using the law of mass action which is a very sensitive means to measure low quantities of H 2 or T 2 respectively via the detection of the isotopomeres HD and DT. Since the puffed tritium was about one order of magnitude smaller than the H flux introduced, a DT-flux of only $1% is expected, resulting in a T 2 flux of 0.1%. Evidence will be presented that similar levels have indeed been detected, although the signals were near the detection limit, demonstrating that this type of spectroscopy offers an interesting potential tool as a fuelling and recycling rate diagnostic.

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“…The Trace Tritium Experiment (TTE) was performed at JET in 2003 aimed at tritium transport studies, investigation of the fast particle influence on the plasma and new heating scenarios [1][2][3]. The TTE campaign was also devoted to the development and testing of new diagnostics for possible application on JET-EP and ITER [4].…”

Section: Introductionmentioning

confidence: 99%