17-08-2012, 03:18 PM
Progress Towards RF Steady State Systems For Fusion Devices
[attachment=31879]
Introduction
RF systems are widely used on magnetically confined fusion experiments.
Developments during many years have produced RF systems which have supported the progress of plasma performance and opened up new areas of investigation.
For the next step devices, long pulse operation is essential and it is a new challenge for the integration of the RF systems. They have to be highly reliable, with built-in strategies to recover from trips and breakdowns.
Tore Supra Exp. Results
The progress in term of RF assisted discharges can be expressed in the domain Energy/Duration.
Recent experimental work is focused on :
Combined operation of RF systems : The high power & performance quest
Interaction studies : try to live together
Identify and study specific issues :
Heat : Private heat flux, local RF losses, heat flux from other antennas, limiter connections, Protons impacts
Safety Control loops
Various hot spots on the ICRH antennae are identified
1: sensitive to the total power
2: mixed total IC power and private IC power
3: sensitive to LH power only
4: predominantly private IC power
RF developments
Tore Supra is exploring long duration plasmas
Plasma size (a~0.7m) : need for non inductive CD
Large operational domain = large power
Large power = appropriate PFC and controls
Highest efficiency for volume CD is LHCD
On going upgrade of LHCD system to 8MW:
New LHCD launcher
New high power CW klystron
ITER support :
New TS LHCD launcher is ITER-like Design
ITER-like ICRH antenna
[attachment=31879]
Introduction
RF systems are widely used on magnetically confined fusion experiments.
Developments during many years have produced RF systems which have supported the progress of plasma performance and opened up new areas of investigation.
For the next step devices, long pulse operation is essential and it is a new challenge for the integration of the RF systems. They have to be highly reliable, with built-in strategies to recover from trips and breakdowns.
Tore Supra Exp. Results
The progress in term of RF assisted discharges can be expressed in the domain Energy/Duration.
Recent experimental work is focused on :
Combined operation of RF systems : The high power & performance quest
Interaction studies : try to live together
Identify and study specific issues :
Heat : Private heat flux, local RF losses, heat flux from other antennas, limiter connections, Protons impacts
Safety Control loops
Various hot spots on the ICRH antennae are identified
1: sensitive to the total power
2: mixed total IC power and private IC power
3: sensitive to LH power only
4: predominantly private IC power
RF developments
Tore Supra is exploring long duration plasmas
Plasma size (a~0.7m) : need for non inductive CD
Large operational domain = large power
Large power = appropriate PFC and controls
Highest efficiency for volume CD is LHCD
On going upgrade of LHCD system to 8MW:
New LHCD launcher
New high power CW klystron
ITER support :
New TS LHCD launcher is ITER-like Design
ITER-like ICRH antenna