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TFE 3/2/2004 – Fuel retention in JET - J. Bucalossi / T. Loarer Assessment of fuel retention in JET : Contingency – 2 shifts on 6 th of february E. Tsitrone.

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Presentation on theme: "TFE 3/2/2004 – Fuel retention in JET - J. Bucalossi / T. Loarer Assessment of fuel retention in JET : Contingency – 2 shifts on 6 th of february E. Tsitrone."— Presentation transcript:

1 TFE 3/2/2004 – Fuel retention in JET - J. Bucalossi / T. Loarer Assessment of fuel retention in JET : Contingency – 2 shifts on 6 th of february E. Tsitrone for J. Bucalossi and T. Loarer Motivation Previous results Pulse configuration

2 TFE 3/2/2004 – Fuel retention in JET - J. Bucalossi / T. Loarer Motivation : tritium retention in ITER  need for experimental data Code validation : Underestimation of the JET DTE1 T retention by a factor 10-40 Nb of ITER pulses T inventory (g) ITER predictions : Codeposition dominates T retention : 1 to 4 g of T per 400s pulse ITER in vessel T inventory limit : 360 g of T  100 to 350 pulses G. Federici, Workshop on In Vessel Tritium Inventory, JET, March 2003

3 TFE 3/2/2004 – Fuel retention in JET - J. Bucalossi / T. Loarer Previous results : H mode long discharges at JET Integrated particle balance : Long term retention : 10 % of injected gas Particle balance during shot : Dynamic retention :  50 % of injected gas (  TS) Medium Gas Puff 16 s of flat top in H mode Ip = 1 MA, 6 MW of NBI Shot 59197

4 TFE 3/2/2004 – Fuel retention in JET - J. Bucalossi / T. Loarer Assessment of fuel retention in JET TFE C14 - Feb. 6th Early and Late SCs: J. Bucalossi/T. Loarer SLs: G. Matthews/M. Stamp Aim: perform a gas balance with the maximum accuracy Divertor Cryopump regeneration just before and just after the session (+ gas analysis) no NBI (no LHCD) to avoid NBI Box (LHCD) pumping no disruption high D 2 fuelling rate (in feedback control to avoid disruption) maximum pulse rate Calibration : gas injection w/o B field and w/o div cryopump (to calibrate pressure gauges) dry run with gas puff (to check divertor pumping speed) Scenario: 2MA/2.43T, 5-6MW ICRH, 42 MHz dipole, high density (90fr) ref. pulse #61751… (POG/TTE_CLEANUP/1.3), Gas ~ 6 bar.l combined with QMB available data for divertor configuration choice (DOC L/Vertical/Corner/Horizontal target,4 pulse types ?) 40 pulses at 6 bar.l/pulse  ~ 240 bar.l (reasonable for PCD and GB)

5 TFE 3/2/2004 – Fuel retention in JET - J. Bucalossi / T. Loarer Typical scenario (from TTE clean-up) 4050607080 -4 -2 0 2 4 JPN 61751 - Plasma Parameters 4050607080 0 0.5 1 1.5 2 2.5 x 10 22 Electrons / s Gas Injection 4050607080 10 -8 10 -6 10 -4 10 -2 mbar Pressure Measurements 4050607080 0 50 100 150 200 P divertor /P vessel Z Xp (m) Ip (MA) ne (10 19 m -3 ) RF (MW) sub-div vessel NBI (MW)

6 TFE 3/2/2004 – Fuel retention in JET - J. Bucalossi / T. Loarer 5657585960616263646566 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 t (s) JPN 61751 Retention Tentative particle balance (with 2001 calibrations) “Dynamic” D retention Feb 6 th  in-vessel fuel retention ~ (total gas input – PD Regen.)/total gas input

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