- About HBT-EP -

HBT-EP was designed to demonstrate the feasibility of a high-beta tokamak stabilized by a combination of a close-fitting conducting wall, plasma rotation, and active feedback. The specific approach taken by HBT-EP was to investigate the combined use of a close-fitting conducting wall and modular saddle coils for the purpose of significantly extending the tokamak beta limit.

HBT-EP is a unique experiment for the investigation of wall-stabilization being the only tokamak device built with adjustable walls and having a vacuum chamber made with several quartz cylindrical breaks. These breaks allow fast penetration of externally-applied magnetic perturbations. HBT-EP has accelerated magnetic islands of nearly sonic speed and the device has been used to access the Troyon normalized beta limit with ohmic heating alone.

HBT-EP has ohmic parameters in the range given by:

  • R = 0.92 m
  • a = 0.15 m
  • B = 0.35 T
  • Te = 50 - 150 eV
  • ne = 1 - 3 x 1019/m3
  • βN = β/(Ip/aB) ≤ 2 % m.T/MA
  • Ip ≤ 30 kA

D. Gates' thesis provides a brief but comprehensive primer on most of the diagnostics and equipment composing the HBT-EP experiment. Though some aspects are out of date, it can and should be used as a first point of reference to understand how the various pieces of the machine function together.

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Magnetic Optical Feedback Other
Ferritic Wall Soft X-Ray Data Acquisition Hall Probe
Poloidal Sensors Thomson Scattering Power Amplifiers Bias Probe
Toroidal Sensors Fast Camera CPCI Mach/Float Probe
Rogowski Coils D-Alpha Signal Amps Rotation