Discussion on TC-2 JEX Culham, 25.3.2010
description
Transcript of Discussion on TC-2 JEX Culham, 25.3.2010
Discussion on TC-2 JEXDiscussion on TC-2 JEX
Culham, 25.3.2010Culham, 25.3.2010
Yves Martin, Andreas Pitzschke
Centre de Recherches en Physique des Plasmas
Association Euratom - Confédération Suisse
Ecole Polytechnique Fédérale de Lausanne (EPFL)
CH - 1015 Lausanne, Switzerland
OutlineOutline
Preamble• TCV: H-modes with ECH-X3
Discussion on TC-2• Goals• Future work
Yves Martin, TC-2 JEX, ITPA T&C Meeting, Culham, 22-25.3.2010 2
TCV – characteristicsTCV – characteristics
• High flexibility in plasma shaping 16 shaping coils, independently driven
• High power, high flexibility ECH system 3MW X2 (lateral) + 1.5MW X3 (top), steerable mirrors
Yves Martin, TC-2 JEX, ITPA T&C Meeting, Culham, 22-25.3.2010 3
TCV – H-mode operational domainTCV – H-mode operational domain
• Ohmic Diverted configuration, some shaping (, , Xpt location)
Ip>250kA, ne>3.5 1019m-3
• ECH – X3 Better absorption when already in H-mode
Yves Martin, TC-2 JEX, ITPA T&C Meeting, Culham, 22-25.3.2010 4
TCV – some examplesTCV – some examples
Yves Martin, TC-2 JEX, ITPA T&C Meeting, Culham, 22-25.3.2010 5
Ip ~ 400kAne ~ 4.5 1019m-3
~1.7 ~ 0.6
Unfavourable
Favourable
Favourable
Favourable
TCV – 2 other examplesTCV – 2 other examples
Yves Martin, TC-2 JEX, ITPA T&C Meeting, Culham, 22-25.3.2010 6
Y.Martin et al., PPCF 48 (2006), A163
L.Porte et al., NF 47 (2007), 952
TCV – In the H factor vs PTCV – In the H factor vs PLL/P/Pthreshthresh mapmap
Yves Martin, TC-2 JEX, ITPA T&C Meeting, Culham, 22-25.3.2010 7
Ohmic
1 point
1 discharge
TCV – Future workTCV – Future work
Ohmic• Wide ranges in plasma parameters• Far from H~1• => indications of dependences
ECH – X3• Closer to H~1 but far from PL/Pthresh~1
• Smaller diversity in plasma shapes, conditions
=> Exploration of TCV database=> New experiments with low power X3
Yves Martin, TC-2 JEX, ITPA T&C Meeting, Culham, 22-25.3.2010 8
Discussion TC-2Discussion TC-2
Goals of TC-21. Test ITER scenario (initial goal)
L-H transition at low density (0.4ngr) with P~Pthresh
Reach a target density of 0.8ngr (naturally + ev. gas puff) without increasing power
Characterise confinement (H factor, ELMs, ...) Increase power either before L-H transition or
during density ramp to reach H~1
2. Explore existing devices databases (decided last meet.) Identify stationary phases with PL/Pthresh~1 and
H~1 Characterise the plasma conditions
Yves Martin, TC-2 JEX, ITPA T&C Meeting, Culham, 22-25.3.2010 9
Discussion TC-2Discussion TC-2
Future work• Pursue investigation / experiment
Complete DB investigation for each individual devices
Compare/discuss identified trends (next meeting?) Identify common trends (next meeting?) Perform planned experiment exploiting common trends
• Other ideas ?
• Commitment Teams / devices ? Names ? Delays ?
Yves Martin, TC-2 JEX, ITPA T&C Meeting, Culham, 22-25.3.2010 10