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Gyrotron tests were recently carried out on CPI gyrotrons at frequencies of 117.5 GHz and 140 GHz. At 117.5 GHz, output power levels of 1.67 MW were obtained under short-pulse conditions and long-pulse tests with pulse durations of 1–10 s have been performed with power levels up to 700 kW. Further long-pulse testing to higher power levels will be carried out after shipment of the gyrotron to General...
CPI's existing 140 GHz, 900 kW, long-pulse gyrotron design has been adapted to enable operation in an alternative mode at 104 GHz, in addition to the primary 140 GHz mode. The dual-frequency version of this gyrotron has been developed for use in plasma heating experiments at the W7-X stellarator at IPP Greifswald. The gyrotron has been fabricated, and factory testing is currently in progress (as of...
CPI is developing gyrotrons for fusion plasma heating and current drive at several frequencies. Several of these gyrotrons have undergone initial testing, and are being rebuilt to improve performance. Others are nearing completion of fabrication, with initial testing to begin soon.
CPI is currently developing megawatt-class gyrotrons for fusion plasma heating and current drive across a range of frequencies in the mm-wave regime. 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 will be described.
The experimental demonstration of a 527 GHz, continuous wave (CW) gyrotron operating at the second cyclotron harmonic in a 9.7 T magnetic field is described. The gyrotron is currently being used in Dynamic Nuclear Polarization (DNP) experiments at the University of Utrecht in the Netherlands. DNP is a technique used to enhance the sensitivity of nuclear magnetic resonance (NMR) experiments by transferring...
CPI is currently developing megawatt-class gyrotrons for fusion plasma heating and current drive across a range of frequencies. These gyrotrons are at various stages of development, which will be summarized.
Communications & Power Industries (CPI) has recently fabricated two gyrotrons designed to produce a megawatt of output power. The first system is a 110 GHz, 1.2 MW, 10-second-pulse gyrotron to be used for electron cyclotron heating and current drive on the DIII-D tokamak at General Atomics (GA). This gyrotron has completed factory testing, where it demonstrated 1.2 MW output power for short pulses,...
Dynamic Nuclear Polarization (DNP) is a technique used to increase sensitivity of nuclear magnetic resonance (NMR) by transferring the higher polarization of unpaired electron spins to nuclear spins. The polarization transfer is driven by high frequency millimeter-wave radiation. CPI has developed continuous wave (cw) gyrotrons at 263 GHz, 395 GHz, and 527 GHz for Bruker Biospin's DNP spectrometers...
A 95 GHz gyrotron capable of generating CW power levels in excess of 2 MW is currently under development at CPI. Recently, peak output powers in excess of 1.9 MW were demonstrated with measured efficiencies of 40%. Detailed test results and future plans will be presented.
A major upgrade to the electron cyclotron heating complex on the DIII-D tokamak is underway. Two depressed collector gyrotrons are being added to the complex and the transmission lines are being upgraded. Transmission line efficiencies are being increased by reduction in the number of miter bends together with improved alignment resulting in improved mode purity.
A 95 GHz gyrotron capable of generating CW power levels in excess of 2 MW is currently under development at CPI. The gyrotron employs a single-anode electron gun that produces a 90-kV, 75-A electron beam for interaction with the TE22,6,1 cavity mode. Output power from the cavity is transformed into a fundamental Gaussian beam using an internal converter that consists of a waveguide launcher and three...
Summary form only given. A 95 GHz gyrotron capable of generating CW power levels in excess of 2 MW is currently under development at CPI. The gyrotron makes use of a single-anode electron gun that produces a 90-kV, 75-A electron beam for interaction with the TE22,6,1 cavity mode. Microwave power produced in the interaction cavity is transformed into a fundamental Gaussian beam using an internal waveguide...
A 25 W CW gyrotron operating at 263 GHz has been designed, fabricated, and demonstrated. Experimental results, which include power tuning curves and infrared images of the output beam, will be presented.
Summary form only given: Dynamic nuclear polarization (DNP) can be used to increase the sensitivity of nuclear magnetic resonance (NMR) experiments by transferring the much higher polarization of unpaired electrons spins to nuclear spins. The polarization transfer is driven by high frequency millimeter wave irradiation. Communications and power industries is an original equipment manufacturer of gyrotron...
Summary form only given: A 95 GHz, multi-megawatt continuous-wave (CW) gyrotron oscillator is currently under development at CPI. The initial experimental campaign demonstrated peak output power levels up to 1 MW at 40 A beam current for pulse lengths up to 5 ms, and output power of 630 kW at 25 A beam current for pulse lengths up to 15 s. Modifications to the CPI test stand were then implemented...
A 95 GHz, multi-megawatt continuous-wave (CW) gyrotron oscillator is currently under development at CPI. During the initial experimental campaign peak output power levels up to 1 MW at 40A beam current were demonstrated at pulse lengths up to 5 ms. In addition, pulses up to 15 s in duration at 25 A beam current, the long-pulse limit of the CPI test stand, and 630 kW peak output power were achieved...
Summary form only given. A 95 GHz, multi-megawatt continuous-wave (CW) gyrotron oscillator is currently under development at CPI. The gyrotron consists of a single-anode magnetron injection gun designed to operate at 75 A and 90 kV, a TE22,6 mode cylindrical interaction cavity, an internal mode converter to transform the TE22,6 mode to a Gausssian beam, an edge- cooled CVD diamond output window, and...
A 95 GHz, multi-megawatt continuous-wave (CW) gyrotron oscillator is currently under development at CPI. The gyrotron consists of a single-anode magnetron injection gun designed to operate at 75 A and 90 kV, a TE22,6 mode cylindrical interaction cavity, an internal mode converter to transform the TE22,6 mode to a Gausssian beam, an edge-cooled CVD diamond output window, and a single-stage depressed...
As part of an ongoing program to develop a high power mm-wave source for use on a mobile platform, CPI is developing two prototype gyrotrons designed to produce more than 2 MW of output power at a frequency of 95 GHz. The first prototype employs a cylindrical noncoaxial interaction circuit designed to operate in the TE22,6 mode, and is currently undergoing preliminary factory testing (discussed at...
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