Control Strategy for the Acceleration Voltage of the ITER Neutral Beam Injector

The acceleration grid power supply of the ITER neutral beam injector is designed to deliver up to 200 kV to each of the five stages of the electrostatic accelerator, producing a total voltage up to -1 MV with respect to ground. In the present design, the output voltages of the dc generators are inde...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2012-03, Vol.40 (3), p.564-569
Main Authors: Ferro, A., Zanotto, L., Toigo, V.
Format: Article
Language:English
Subjects:
Acceleration
Accuracy
Current measurement
Dynamical systems
Electric currents
Electric potential
Electrostatics
Grounds
Injectors
ITER
Loads (forces)
Manganese
Measurement
neutral beam injector
Neutral beams
Particle beams
power supplies
Voltage
Voltage control
Voltage measurement
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Summary:The acceleration grid power supply of the ITER neutral beam injector is designed to deliver up to 200 kV to each of the five stages of the electrostatic accelerator, producing a total voltage up to -1 MV with respect to ground. In the present design, the output voltages of the dc generators are independently controlled by five closed control loops. The output voltage measurements are obtained from the difference between the grid potential measurements, referred to local ground. Therefore, the control accuracy for each stage is affected by the amplification of the measurement errors. Thus, an alternative control scheme, based on a single closed control loop and regulator, has been considered. In this paper, the performance of the two control methods in terms of systematic errors, dynamic performance, and sensitivity to load variations is evaluated and compared.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2011.2173355