4 MW upgrade to the DIII-D fast wave current drive system

J. S. deGrassie; R. I. Pinsker; W. P. Cary; R. W. Callis; R. O'Neill; C. C. Petty; D. B. Remsen; F. W. Baity; R. H. Goulding; S. W. Ferguson

4 MW upgrade to the DIII-D fast wave current drive system

J. S. deGrassie, R. I. Pinsker, W. P. Cary, R. W. Callis, R. O'Neill, C. C. Petty, D. B. Remsen, F. W. Baity, R. H. Goulding, S. W. Ferguson

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

5 Scopus citations

Abstract

The DIII-D fast wave current drive (FWCD) system is being upgraded by an additional 4 MW in the 30 to 120 MHz frequency range. This capability adds to the existing 2 MW 30 to 60 MHz system. Two new ABB transmitters of the type that are in use on the ASDEX-Upgrade tokamak in Garching will be used to drive two new water-cooled four-strap antennas to be installed in DIII-D in early 1994. The transmission and tuning system for each antenna will be similar to that now in use for the first 2 MW system on DIII-D, but with some significant improvements. One improvement consists of adding a decoupler element to counter the mutual coupling between the antenna straps which results in large imbalances in the power to a strap for the usual current drive intrastrap phasing of 90°. Another improvement is to utilize pressurized, ceramic-insulated transmission lines. The intrastrap phasing will again be controlled in pairs, with a pair of straps coupled in a resonant loop configuration, locking their phase difference at either 0 or 180°, depending upon the length of line installed. These resonant loops will incorporate a phase shifter so that they will be able to be tuned to resonance at several frequencies in the operating band of the transmitter. With the frequency change capability of the ABB generators, the FWCD frequency will thus be selectable on a shot-to-shot basis, from this preselected set of frequencies. The schedule is for experiments to begin with this added 4 MW capability in mid-1994. The details of the system are described.

Original language	English
Title of host publication	Proceedings - Symposium on Fusion Engineering
Publisher	Publ by IEEE
Pages	1073-1076
Number of pages	4
ISBN (Print)	0780314131
State	Published - 1993
Externally published	Yes
Event	Proceedings of the 15th IEEE/NPSS Symposium on Fusion Engineering. Part 2 (of 2) - Hyannis, MA, USA Duration: Oct 12 1993 → Oct 12 1993

Publication series

Name	Proceedings - Symposium on Fusion Engineering
Volume	2

Conference

Conference	Proceedings of the 15th IEEE/NPSS Symposium on Fusion Engineering. Part 2 (of 2)
City	Hyannis, MA, USA
Period	10/12/93 → 10/12/93

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Cite this

@inproceedings{378a37701ab047fe95ffa5f4887880a2,

title = "4 MW upgrade to the DIII-D fast wave current drive system",

abstract = "The DIII-D fast wave current drive (FWCD) system is being upgraded by an additional 4 MW in the 30 to 120 MHz frequency range. This capability adds to the existing 2 MW 30 to 60 MHz system. Two new ABB transmitters of the type that are in use on the ASDEX-Upgrade tokamak in Garching will be used to drive two new water-cooled four-strap antennas to be installed in DIII-D in early 1994. The transmission and tuning system for each antenna will be similar to that now in use for the first 2 MW system on DIII-D, but with some significant improvements. One improvement consists of adding a decoupler element to counter the mutual coupling between the antenna straps which results in large imbalances in the power to a strap for the usual current drive intrastrap phasing of 90°. Another improvement is to utilize pressurized, ceramic-insulated transmission lines. The intrastrap phasing will again be controlled in pairs, with a pair of straps coupled in a resonant loop configuration, locking their phase difference at either 0 or 180°, depending upon the length of line installed. These resonant loops will incorporate a phase shifter so that they will be able to be tuned to resonance at several frequencies in the operating band of the transmitter. With the frequency change capability of the ABB generators, the FWCD frequency will thus be selectable on a shot-to-shot basis, from this preselected set of frequencies. The schedule is for experiments to begin with this added 4 MW capability in mid-1994. The details of the system are described.",

author = "deGrassie, {J. S.} and Pinsker, {R. I.} and Cary, {W. P.} and Callis, {R. W.} and R. O'Neill and Petty, {C. C.} and Remsen, {D. B.} and Baity, {F. W.} and Goulding, {R. H.} and Ferguson, {S. W.}",

year = "1993",

language = "English",

isbn = "0780314131",

series = "Proceedings - Symposium on Fusion Engineering",

publisher = "Publ by IEEE",

pages = "1073--1076",

booktitle = "Proceedings - Symposium on Fusion Engineering",

note = "Proceedings of the 15th IEEE/NPSS Symposium on Fusion Engineering. Part 2 (of 2) ; Conference date: 12-10-1993 Through 12-10-1993",

}

deGrassie, JS, Pinsker, RI, Cary, WP, Callis, RW, O'Neill, R, Petty, CC, Remsen, DB, Baity, FW, Goulding, RH & Ferguson, SW 1993, 4 MW upgrade to the DIII-D fast wave current drive system. in Proceedings - Symposium on Fusion Engineering. Proceedings - Symposium on Fusion Engineering, vol. 2, Publ by IEEE, pp. 1073-1076, Proceedings of the 15th IEEE/NPSS Symposium on Fusion Engineering. Part 2 (of 2), Hyannis, MA, USA, 10/12/93.

TY - GEN

T1 - 4 MW upgrade to the DIII-D fast wave current drive system

AU - deGrassie, J. S.

AU - Pinsker, R. I.

AU - Cary, W. P.

AU - Callis, R. W.

AU - O'Neill, R.

AU - Petty, C. C.

AU - Remsen, D. B.

AU - Baity, F. W.

AU - Goulding, R. H.

AU - Ferguson, S. W.

PY - 1993

Y1 - 1993

N2 - The DIII-D fast wave current drive (FWCD) system is being upgraded by an additional 4 MW in the 30 to 120 MHz frequency range. This capability adds to the existing 2 MW 30 to 60 MHz system. Two new ABB transmitters of the type that are in use on the ASDEX-Upgrade tokamak in Garching will be used to drive two new water-cooled four-strap antennas to be installed in DIII-D in early 1994. The transmission and tuning system for each antenna will be similar to that now in use for the first 2 MW system on DIII-D, but with some significant improvements. One improvement consists of adding a decoupler element to counter the mutual coupling between the antenna straps which results in large imbalances in the power to a strap for the usual current drive intrastrap phasing of 90°. Another improvement is to utilize pressurized, ceramic-insulated transmission lines. The intrastrap phasing will again be controlled in pairs, with a pair of straps coupled in a resonant loop configuration, locking their phase difference at either 0 or 180°, depending upon the length of line installed. These resonant loops will incorporate a phase shifter so that they will be able to be tuned to resonance at several frequencies in the operating band of the transmitter. With the frequency change capability of the ABB generators, the FWCD frequency will thus be selectable on a shot-to-shot basis, from this preselected set of frequencies. The schedule is for experiments to begin with this added 4 MW capability in mid-1994. The details of the system are described.

AB - The DIII-D fast wave current drive (FWCD) system is being upgraded by an additional 4 MW in the 30 to 120 MHz frequency range. This capability adds to the existing 2 MW 30 to 60 MHz system. Two new ABB transmitters of the type that are in use on the ASDEX-Upgrade tokamak in Garching will be used to drive two new water-cooled four-strap antennas to be installed in DIII-D in early 1994. The transmission and tuning system for each antenna will be similar to that now in use for the first 2 MW system on DIII-D, but with some significant improvements. One improvement consists of adding a decoupler element to counter the mutual coupling between the antenna straps which results in large imbalances in the power to a strap for the usual current drive intrastrap phasing of 90°. Another improvement is to utilize pressurized, ceramic-insulated transmission lines. The intrastrap phasing will again be controlled in pairs, with a pair of straps coupled in a resonant loop configuration, locking their phase difference at either 0 or 180°, depending upon the length of line installed. These resonant loops will incorporate a phase shifter so that they will be able to be tuned to resonance at several frequencies in the operating band of the transmitter. With the frequency change capability of the ABB generators, the FWCD frequency will thus be selectable on a shot-to-shot basis, from this preselected set of frequencies. The schedule is for experiments to begin with this added 4 MW capability in mid-1994. The details of the system are described.

UR - http://www.scopus.com/inward/record.url?scp=0027756403&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0027756403

SN - 0780314131

T3 - Proceedings - Symposium on Fusion Engineering

SP - 1073

EP - 1076

BT - Proceedings - Symposium on Fusion Engineering

PB - Publ by IEEE

T2 - Proceedings of the 15th IEEE/NPSS Symposium on Fusion Engineering. Part 2 (of 2)

Y2 - 12 October 1993 through 12 October 1993

ER -

4 MW upgrade to the DIII-D fast wave current drive system

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Conference

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