CCR completed assembly of a new, high efficiency RF source for driving superconducting accelerator cavities. The system uses a high efficiency magnetron that is phase locked for precise frequency and phase control. Amplitude control is achieved in real-time by phase modulating the locking signal. This allows feedback control of the magnetron phase and output power. The prototype system is designed to produce 100 kW at 1.3 GHz. System testing is scheduled for spring 2017.
The U.S. Navy awarded CCR a $1M contract to develop technology to reduce corrosion in RF sources and solenoids. This addresses issues caused by sub-standard coolant water on ships in the fleet. CCR will team with North Carolina State University to develop Atomic Layer Deposition processes and equipment to deposit a protective coating inside copper-based cooling circuits. This equipment would be installed at OEMs manufacturing traveling wave tubes, klystrons, magnetrons, and associated equipment. The goal is to triple the lifetime of these devices, which would result in significant cost savings for the Navy. It is anticipated this technology would be applicable to any water cooled device installed where high quality cooling water is not easily available, including remote locations and developing countries.
CCR completed the assembly of a PPM-focused klystron designed to generate 5.5 MW of RF power at S-Band. The klystron is targeted for the next generation of cancer therapy devices. The elimination of the solenoid will reduce the size of the RF source system, allowing a smaller cancer-treatment device.
The klystron magnetic circuit uses an innovative design that provides an azimuthally symmetric field while providing access to the cavities for tuners and water cooling. This prototype tube includes tuners on five cavities. After determination of the optimum cavity frequencies, the tuners will be removed to reduce the production cost.
This program is funded by the U.S. Department of Energy through grant number DE-SC0007591.
CCR completed the assembly of its 1.5 MW CW, diamond Brewster angle window and shipped it to MIT for lower power testing. MIT will test the window using their unique facilities to generate the HE11 mode in corrugated waveguide. Once the tests at MIT are complete, the window will be shipped to General Atomics for high power testing in the DIII-D transmission line.
Life testing of the reflector assembly for CCR’s 1.5 MW CW RF load assembly was terminated on January 3rd after operating for more than 410,000 cycles. The assembly was still operating satisfactorily when the testing was stopped. This is more than twice the expected lifetime for a load in operation at a gyrotron facility. The assembly is being disassembled to determine areas where the design can be improved. These improvements will be implemented to further improve the reliability of the device. The previous post provides a video of the assembly operating in the testing structure.