- 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 10^19/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 Though some aspects are out of date, it can and should be used as a first point of reference to understand how the various pieces of the machine function together.

Portortornec condimenterdum eget consectetuer condis consequam pretium pellus sed mauris enim. Puruselit mauris nulla hendimentesque elit semper nam a sapien urna sempus.

Projects

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