Gas Dynamic Trap
The Gas Dynamic Trap is a magnetic mirror machine being operated at the Budker Institute of Nuclear Physics in Akademgorodok, Russia.
Technical specifications
Dimensions The plasma inside the machine fills a cylinder of space, 7 meters long and 28 centimeters in diameter.[1] The magnetic field varies along this tube. In the center the field is low; reaching (at most) 0.35 Teslas. The field rises to as high as 15 Teslas at the ends.[1] This change in the strength is needed to reflect the particles and get them internally trapped (see: the magnetic mirror effect).
Heating The plasma is heated using two methods, simultaneously. The first is
Performance As of 2016, the machine had achieved a plasma trapping
Diagnostics
During any given experiment, operators can choose from at least 15 fusion diagnostics to measure the machines' behavior:[2]
- Thomson Scattering
- Motional Stark Effect
- CX Energy Analysis (2)
- Rutherford Ion Scattering
- Ion End Loss Analyzer
- Microwave Interferometer
- Dispersion Interferometer
- Diamagnetic Loops
- Langmuir Probes
- Pyro electric Detectors
- RF Probes
- Beam Dump Calorimeters
- NBI Sec. Electron Detectors
- Neutron Detectors
- Thermonuclear Proton Detectors
Pictures of the GDT
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The structure of the Gas Dynamic Trap, showing the magnets (in red) and two methods of heating the plasma (Neutral beam injection) and (Electron Cyclotron Resonance Heating). Also shown is the magnetic field profile across the machine.[4]
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The Gas Dynamic Trap as seen from above.
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The location of the Diagnostics used to measure the behavior of the GDT.