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CPI has been developing megawatt-class gyrotrons for fusion plasma heating and current drive for a range of frequencies in the mm-wave regime. Gyrotrons at 110 GHz, 117.5 GHz, 140 GHz, and 170 GHz have been designed and fabricated, and have undergone initial factory testing. Some systems have been delivered for commissioning at fusion research facilities, while several await modification following...
A 140 GHz gyrotron capable of producing output powers up to 900 kW for 1000-second pulses has been developed at CPI. Factory testing demonstrated 1000-second operation at the 25 A CW current limit of the test facility, at which the output power was about 500 kW, and demonstrated 900 kW operation for short pulses. The gyrotron was then shipped to Hefei, China, and installed as part of the electron...
A 140 GHz gyrotron capable of producing output powers up to 900 kW for 1000 second pulse durations has recently been developed and demonstrated at CPI. In July of 2014, the gyrotron was shipped to Hefei, China for use in the electron cyclotron heating and current drive (ECH&CD) system at the EAST tokamak. Installation of the gyrotron at EAST is complete and initial operation is underway. Design...
Two megawatt-class gyrotrons at frequencies of 117.5 GHz and 170 GHz have recently been fabricated and tested at CPI. The 117.5 GHz gyrotron was designed to produce up to 1.8 MW, for 10-second pulses. The 170 GHz gyrotron is specified as a 500 kW CW system, but has been designed with the goal of generating up to 1 MW CW. Thus far both gyrotrons have achieved the peak power goals in initial testing...
Dynamic nuclear polarization (DNP) enhanced nuclear magnetic resonance (NMR) spectroscopy has emerged as a new and growing application for high-frequency, continuous wave (cw) vacuum electronic devices capable of producing powers in the range of tens to hundreds of watts at millimeter-wave and terahertz frequencies. As an original equipment manufacturer of gyrotrons for Bruker Biospin DNP spectrometers,...
A gyrotron operating in the TE20, 9 interaction mode at 117.5 GHz has been developed. Communications and Power Industries (CPI) has designed, fabricated, and conducted initial testing of this device. Short pulse testing demonstrates output power levels up to 1.8 MW, with electrical efficiencies of up to 42% (including the effect of a single-stage depressed collector), for an accelerating voltage of...
Communications and Power Industries (CPI) is currently developing megawatt-class gyrotrons for fusion plasma heating and current drive across a range of frequencies, for use at several different fusion research facilities. These gyrotrons are currently at different stages of development, fabrication, and test. Design features will be compared, available test data will be presented, and future plans...
A gyrotron operating at the second cyclotron harmonic in a magnetic field of 9.7 T has produced a CW output power of 25 W at 527 GHz. The gyrotron is now being employed in Dynamic Nuclear Polarization (DNP) Applications. The gyrotron design and results of the tests are presented.
CPI, an original equipment manufacturer of gyrotrons for Bruker Biospin DNP spectrometers, has developed several high-frequency, continuous wave (cw) gyrotrons for NMR/DNP applications. The experimental demonstration of a fundamental 263 GHz gyrotron, as well as design details of second harmonic 395 GHz and 527 GHz gyrotrons will be presented.
A 170 GHz, 500 kW CW gyrotron has been developed for testing ITER transmission line components. Although specified as a 500 kW source, the electrical design has been developed with the goal of generating up to 1 MW of continuous output power. The design employs a mod-anode electron gun, a cylindrical cavity operating in the TE31, 8 eigenmode, an internal converter to produce a fundamental Gaussian...
A 95 GHz gyrotron capable of generating CW power levels in excess of 2 MW is currently under development at CPI. Key design features of the gyrotron and the results of two experimental campaigns are described.
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