Left: Scale of European tokamaks with cross-section similar to ITER. Right: Cutaway diagram of tokamak COMPASS
The history of the COMPASS installation in IPP Prague
2004 - 2005 |
preparatory phase |
June 2006 |
start of the project (awarding the preferential support by EURATOM) |
2006-2008 |
design, construction of buildings, dismantling, transport of the tokamak |
December 2007 |
installation of the tokamak into new torus hall |
2008 |
the first plasma achieved |
2009-2011 |
final commissioning of the diagnostics, control systems, power supplies |
2012 |
scientific exploitation (operational phase) |
November 2012 |
H-mode scenario achieved |
2013 |
Edge Localized Modes Type-I achieved |
Tokamak COMPASS in the Institute of Plasma Physics of the CAS
Parametres of the Tokamak COMPASS
Parameters |
Values |
Major radius R |
0.56 m |
Minor radius a |
0.23 m |
Plasma current Ip (max) |
400 kA |
Magnetic field BT (max) |
0.9-2.1 T |
Vacuum pressure |
1x10-6 Pa |
Elongation |
1.8 |
Plasma shape D |
D, SND, elipsa, kruh |
Pulse length |
~ 1 s |
Beam heating PNBI 40 keV |
2 x 0.4 MW |
Physics research programme
Pedestal width physics
L-H power threshold, isotope effects
Edge Localized Modes, their control by magnetic perturbation and vertical kicks
Zonal flows
Transport in edge plasma and SOL
- Turbulent structures and intermittency in edge plasma – experiment and modelling
- MHD equilibrium and instabilities
- Plasma-wall interaction
- Physics of runaways and disruption
- Developments of advance diagnostic methods
- Integrated modelling and code development
Main systems
- CODAC (Control, Data Acquisition and Communication) system
- Power Supply
- Fast Feedback control system
- Cooling
- Vacuum system
- Fuelling
- Hydraulic preload system
- Neutral beam injection heating system
- Vessel baking system
- Glow discharge system
Plasma diagnostic systems
1. Magnetic diagnostics (400 coils)
2. Microwave diagnostics
- 2-mm interferometer
- Edge microwave reflectometer (K & Ka bands)
- ECE / EBW radiometer
3. Spectroscopic diagnostics
- HR Thomson scattering core/edge
- Two fast VIS cameras
- Photomultipliers (VIS, Ha, CIII + continuum for Zeff)
- HR2000+ spectrometers for near UV, VIS & near IR
- AXUV-based fast bolometers (arrays)
- Semiconductor-based soft X-ray detectors (arrays)
- Scintillation detector for hard X-rays & HXR camera
- Slow IR camera & fast divertor thermography (35 kHz, 1 mm) – under construction
4. Beam & particle diagnostics
- HR2000+ spectrometer for Ha & Da
- Neutron scintillation detector
- Diagnostics using Li-beam (BES, ABP)
- Two Neutral Particle Analyzers
- Charge-Exchange recombination spectroscopy – under construction
- Detection of fusion products
5. Probe diagnostics
- 39 divertor probes & set at HFS probes in divertor
- Divertor ball-pen probes
- Two reciprocating manipulators (horizontal and vertical)
- Langmuir probes in HFS limiter tiles
Left: Photo of plasma inside vacuum chamber. Right: Numercial reconstruction of the plasma shape
Inside view into the COMPASS vacuum vessel.
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