## Abstract

We have designed and constructed a system for control of the normalized β (β_{N}) in the National Spherical Torus Experiment [M. Ono et ah, Nucl. Fusion, Vol. 40, p. 557 (2000)]. A proportional-integral-derivative operator is applied to the difference between the present value of β_{N} (from real-time equilibrium reconstruction) and a time-dependent request in order to calculate the required injected power. This injected power request is then turned into modulations of the neutral beams. The details of this algorithm are described, including the techniques used to develop the appropriate control gains. Example uses of the system are shown.

Original language | English (US) |
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Pages (from-to) | 11-18 |

Number of pages | 8 |

Journal | Fusion Science and Technology |

Volume | 61 |

Issue number | 1 |

DOIs | |

State | Published - Jan 2012 |

## All Science Journal Classification (ASJC) codes

- Civil and Structural Engineering
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering
- General Materials Science
- Mechanical Engineering

## Keywords

- NSTX
- Neutral beam injection
- Spherical torus

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