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Solid-State Klystron Driver for Lower Hybrid Current Drive

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-SC0018687
Agency Tracking Number: 235830
Amount: $154,949.93
Phase: Phase I
Program: SBIR
Solicitation Topic Code: 21b
Solicitation Number: DE-FOA-0001771
Solicitation Year: 2018
Award Year: 2018
Award Start Date (Proposal Award Date): 2018-07-02
Award End Date (Contract End Date): 2019-04-01
Small Business Information
169 Western Avenue West
Seattle, WA 98119-4211
United States
DUNS: 625349639
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 James Prager
 (206) 582-1244
Business Contact
 Timothy Ziemba
Phone: (206) 582-1240
Research Institution

Launching radio frequency (RF) waves from the high-field side (HFS) of a tokamak has the potential to be an efficient off-axis current drive method while reducing the plasma-material interaction issues of the antenna. Researchers at the Plasma Science and Fusion Center (PSFC) at the Massachusetts Institute of Technology (MIT) have proposed to reuse existing equipment at MIT, including CPI klystrons, to demonstrate HFS RF launching at DIII-D. The current klystron driver is not scalable as the number of klystrons increases; is so large that it cannot be located close to the klystrons, which increases the risk of damaging klystrons during a fault; requires all klystrons be shut down in the event of a fault; and cannot operate for the full length of a DIII-D pulse. Eagle Harbor Technologies (EHT), Inc. is proposing to develop the next-generation klystron driver for use by MIT for HFS RF launching experiments at DIII-D. The next-generation klystron driver will take advantage of the high frequency solid-state switching capabilities developed by EHT with support of the DOE SBIR program. The high frequency nature will allow for the development of a more compact system, which can be placed closer to the klystrons. This system will be designed so that there is one driver per klystron, which will allow the system to scale as more klystrons are added and experiments to continue in the event of a klystron fault. EHT has previously developed a series-stack of solid-state switches and 800 V full-bridge rectifiers for driving plasma injectors. In the Phase I program, EHT will develop a high voltage full-bridge rectifier utilizing the EHT HV solid-state switch to convert the rectified three-phase high voltage to 50 kV pulse required for klystron driving to demonstrate the system at a breadboard-level. EHT will design the system and test each component prior to assembly. Finally, the full breadboard-level klystron driver will be tested. With the test results, EHT will prepare an initial design for implementation in a potential Phase II program. The goal of Phase II would be to develop a full prototype that can be tested with the MIT klystrons.

* Information listed above is at the time of submission. *

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