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Title: Development and use of 60 kV, and 150 kV floating deck modulators for high voltage protection of multi-megawatt ion beam accelerators

Abstract

Extraction currents of 60 A at 40 kV have been produced by utilizing a 60 kV floating deck modulator interfaced to a high voltage power supply. The modulator is operated in a series mode to repetitively pulse power to the ion beam accelerator. Current monitoring and other protective circuits provide interrupt commands to the series switch tube when faults occur. The constant current characteristics of the water cooled tetrode and the rapid response of the protective circuits effectively limit the fault energy to the ion source. Three of the 60 kV decks have been modified and stacked in a series configuration to supply 150 kV, 50 A pulses. This system supplies power for development of higher-energy multi-grid sources. In this system attention has been focused on forced voltage sharing of the three decks and on protective circuits for fault conditions. All control signal processing and conditioning is performed at ground level. Fiber optic links are used to interface with the high potential associated with the floating decks. A shunt modulator incorporated with this system provides regulation of the voltage to the ion source gradient grid. Future modulator development includes a system to deliver 100 A at 80 kV.

Authors:
; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., Tenn. (USA)
OSTI Identifier:
5259890
Report Number(s):
CONF-771029-67
TRN: 78-003088
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Conference
Resource Relation:
Conference: 7. symposium on fusion research project, Knoxville, TN, USA, 25 Oct 1977
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ION SOURCES; MODULATION; SWITCHING CIRCUITS; SPECIFICATIONS; ELECTRIC CURRENTS; ELECTRIC POTENTIAL; ELECTRONIC CIRCUITS; NEUTRAL ATOM BEAM INJECTION; NEUTRAL BEAM SOURCES; ORMAK DEVICES; PLT DEVICES; POWER SUPPLIES; BEAM INJECTION; CLOSED PLASMA DEVICES; CURRENTS; ELECTRONIC EQUIPMENT; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; 700203* - Fusion Power Plant Technology- Power Supplies, Energy Storage; 700205 - Fusion Power Plant Technology- Fuel, Heating, & Injection Systems

Citation Formats

Barber, G C, Ponte, N S, and Schilling, G. Development and use of 60 kV, and 150 kV floating deck modulators for high voltage protection of multi-megawatt ion beam accelerators. United States: N. p., 1977. Web.
Barber, G C, Ponte, N S, & Schilling, G. Development and use of 60 kV, and 150 kV floating deck modulators for high voltage protection of multi-megawatt ion beam accelerators. United States.
Barber, G C, Ponte, N S, and Schilling, G. Sat . "Development and use of 60 kV, and 150 kV floating deck modulators for high voltage protection of multi-megawatt ion beam accelerators". United States. https://www.osti.gov/servlets/purl/5259890.
@article{osti_5259890,
title = {Development and use of 60 kV, and 150 kV floating deck modulators for high voltage protection of multi-megawatt ion beam accelerators},
author = {Barber, G C and Ponte, N S and Schilling, G},
abstractNote = {Extraction currents of 60 A at 40 kV have been produced by utilizing a 60 kV floating deck modulator interfaced to a high voltage power supply. The modulator is operated in a series mode to repetitively pulse power to the ion beam accelerator. Current monitoring and other protective circuits provide interrupt commands to the series switch tube when faults occur. The constant current characteristics of the water cooled tetrode and the rapid response of the protective circuits effectively limit the fault energy to the ion source. Three of the 60 kV decks have been modified and stacked in a series configuration to supply 150 kV, 50 A pulses. This system supplies power for development of higher-energy multi-grid sources. In this system attention has been focused on forced voltage sharing of the three decks and on protective circuits for fault conditions. All control signal processing and conditioning is performed at ground level. Fiber optic links are used to interface with the high potential associated with the floating decks. A shunt modulator incorporated with this system provides regulation of the voltage to the ion source gradient grid. Future modulator development includes a system to deliver 100 A at 80 kV.},
doi = {},
url = {https://www.osti.gov/biblio/5259890}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {1}
}

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