APS Logo

Commissioning of the Pegasus-III Experiment

POSTER

Abstract

The Pegasus-III Experiment is a solenoid-free spherical tokamak dedicated to comparative non-solenoidal tokamak startup studies. Major upgrades to its magnets and power systems have increased BT four-fold to 0.6 T for up to 100 ms with improved shape control while maintaining low A ~ 1.2. This increased field directly supports the mission of researching non-solenoidal power plant-relevant startup techniques such as local and coaxial helicity injection and RF wave injection. The Ohmic solenoid has been removed and the toroidal field system now is comprised of a new 24-turn center rod and outer coil system, torque assemblies with crossover finger joints, and integrated divertor coils. Approximately 175 MVA of programmable power systems and 8.5 MJ of stored energy are available to drive the four-fold toroidal field increase, new divertor and poloidal field coils, and local and coaxial helicity injectors. The digital control system uses FPGA technology and real-time computing to control the electromagnets and helicity injectors while providing fault detection and protection. The commissioning and initial operation of these systems of Pegasus-III, as well as results from the first LHI physics campaign, will be reported.

Presenters

  • John A Goetz

    University of Wisconsin - Madison

Authors

  • John A Goetz

    University of Wisconsin - Madison

  • Mary W Aslin

    University of Wisconsin-Madison

  • Michael W Bongard

    University of Wisconsin-Madison

  • Michael T Borchardt

    University of Wisconsin-Madison

  • Stephanie J Diem

    University of Wisconsin - Madison

  • Abigail L Ferris

    University of Wisconsin - Madison, University of Wisconsin-Madison

  • Armand K Keyhani

    University of Wisconsin-Madison

  • Benjamin A Kujak-Ford

    University of Wisconsin-Madison

  • Benjamin T Lewicki

    University of Wisconsin-Madison

  • Mark D Nornberg

    University of Wisconsin-Madison

  • Jilliann K Peery

    University of Wisconsin-Madison

  • Christopher Pierren

    University of Wisconsin - Madison

  • Joshua A Reusch

    University of Wisconsin-Madison

  • Cuauhtemoc Rodriguez Sanchez

    University of Wisconsin - Madison

  • Rachel K Sassella

    University of Wisconsin-Madison

  • Carolyn E Schaefer

    University of Wisconsin - Madison

  • Aaron C Sontag

    University of Wisconsin - Madison

  • Timothy N Tierney

    University of Wisconsin-Madison

  • Justin D Weberski

    University of Wisconsin - Madison

  • Gregory R Winz

    University of Wisconsin-Madison