Thermonuclear inverse magnetic pumping power cycle for stellarator reactors
Abstract
A novel power cycle for direct conversion of alphaparticle energy into electricity is proposed for an ignited plasma in a stellarator reactor. The plasma column is alternately compressed and expanded in minor radius by periodic variation of the toroidal magnetic field strength. As a result of the way a stellarator is expected to work, the plasma pressure during expansion is greater than the corresponding pressure during compression. Therefore, negative work is done on the plasma during a complete cycle. This work manifests itself as a backvoltage in the toroidal field coils, and direct electrical energy is obtained from this voltage. For a typical reactor, the average power obtained from this cycle (with a minor radius compression factor on the order of 50%) can be as much as 50% of the electrical power obtained from the thermonuclear neutrons without compressing the plasma. Thus, if it is feasible to vary the toroidal field strength, the power cycle provides an alternative scheme of energy conversion for a deuteriumtritium fueled reactor. The cycle may become an important method of energy conversion for advanced neutronlean fueled reactors. By operating two or more reactors in tandem, the cycle can be made selfsustaining.
 Authors:
 Publication Date:
 Research Org.:
 Princeton Univ., NJ (USA). Plasma Physics Lab.
 OSTI Identifier:
 5138614
 Report Number(s):
 PPPL2249
ON: DE86002539
 DOE Contract Number:
 AC0276CH03073
 Resource Type:
 Technical Report
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; STELLARATOR TYPE REACTORS; ENERGY CONVERSION; ALPHA PARTICLES; ELECTRIC POTENTIAL; MAGNETIC FIELD CONFIGURATIONS; MAGNETICPUMPING HEATING; PLASMA PRESSURE; CHARGED PARTICLES; CONVERSION; HEATING; HIGHFREQUENCY HEATING; PLASMA HEATING; THERMONUCLEAR REACTORS; 700207*  Fusion Power Plant Technology Power Conversion Systems
Citation Formats
Ho, D.D.M., and Kulsrud, R.M.. Thermonuclear inverse magnetic pumping power cycle for stellarator reactors. United States: N. p., 1985.
Web. doi:10.2172/5138614.
Ho, D.D.M., & Kulsrud, R.M.. Thermonuclear inverse magnetic pumping power cycle for stellarator reactors. United States. doi:10.2172/5138614.
Ho, D.D.M., and Kulsrud, R.M.. Sun .
"Thermonuclear inverse magnetic pumping power cycle for stellarator reactors". United States.
doi:10.2172/5138614. https://www.osti.gov/servlets/purl/5138614.
@article{osti_5138614,
title = {Thermonuclear inverse magnetic pumping power cycle for stellarator reactors},
author = {Ho, D.D.M. and Kulsrud, R.M.},
abstractNote = {A novel power cycle for direct conversion of alphaparticle energy into electricity is proposed for an ignited plasma in a stellarator reactor. The plasma column is alternately compressed and expanded in minor radius by periodic variation of the toroidal magnetic field strength. As a result of the way a stellarator is expected to work, the plasma pressure during expansion is greater than the corresponding pressure during compression. Therefore, negative work is done on the plasma during a complete cycle. This work manifests itself as a backvoltage in the toroidal field coils, and direct electrical energy is obtained from this voltage. For a typical reactor, the average power obtained from this cycle (with a minor radius compression factor on the order of 50%) can be as much as 50% of the electrical power obtained from the thermonuclear neutrons without compressing the plasma. Thus, if it is feasible to vary the toroidal field strength, the power cycle provides an alternative scheme of energy conversion for a deuteriumtritium fueled reactor. The cycle may become an important method of energy conversion for advanced neutronlean fueled reactors. By operating two or more reactors in tandem, the cycle can be made selfsustaining.},
doi = {10.2172/5138614},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 1985},
month = {Sun Sep 01 00:00:00 EDT 1985}
}

This patent describes the plasma column in a stellarator is compressed and expanded alternatively in minor radius. First a plasma in thermal balance is compressed adiabatically. The volume of the compressed plasma is maintained until the plasma reaches a new thermal equilibrium. The plasma is then expanded to its original volume. As a result of the way a stellarator works, the plasma pressure during compression is less than the corresponding pressure during expansion. Therefore, negative work is done on the plasma over a complete cycle. This work manifests itself as a backvoltage in the toroidal field coils. Direct electrical energymore »

Thermonuclear inverse magnetic pumping power cycle for stellarator reactor
The plasma column in a stellarator is compressed and expanded alternatively in minor radius. First a plasma in thermal balance is compressed adiabatically. The volume of the compressed plasma is maintained until the plasma reaches a new thermal equilibrium. The plasma is then expanded to its original volume. As a result of the way a stellarator works, the plasma pressure during compression is less than the corresponding pressure during expansion. Therefore, negative work is done on the plasma over a complete cycle. This work manifests itself as a backvoltage in the toroidal field coils. Direct electrical energy is obtained frommore » 
Thermonuclear inverse magnetic pumping power cycle for stellarator reactor
The plasma column in a stellarator is compressed and expanded alternatively in minor radius. First a plasma in thermal balance is compressed adiabatically. The volume of the compressed plasma is maintained until the plasma reaches a new thermal equilibrium. The plasma is then expanded to its original volume. As a result of the way a stellarator works, the plasma pressure during compression is less than the corresponding pressure during expansion. Therefore, negative work is done on the plasma over a complete cycle. This work manifests itself as a backvoltage in the toroidal field coils. Direct electrical energy is obtained frommore » 
BEHAVIOR OF THE MAGNETIC LINES OF FORCE IN THE MAGNETIC PUMPING SECTION OF THE B2 STELLARATOR. Technical Memorandum No. 39
Results are summarized from a study of the B2 magnetic pumping section, commonly called the B2 Bulge, using the axially symmetric resistance analogue. The limiting aperture is found for all values of M, the pumping modulus, from zero to 1.00, taken in steps of 0.05. The radius of the limiting flux line is given for seven axially spaced points within the bulge. This radius was found for the instants in time when the RF current is peak negatmve, peak positive, and zero. The location of the limiting flux line for M = 0.85 was determined as a function of time.more »