Abstract
The Shanghai High Repetition Rate XFEL and Extreme Light Facility (SHINE) project will use 600 1.3 GHz fundamental power couplers, which are modified based on TTF-III power couplers, for continuous-wave operation with input power up to approximately 7 kW. The first batch of 20 sets of 1.3 GHz coupler prototypes was fabricated from three domestic manufacturers for the SHINE project. To better characterize the radio frequency conditioning phenomena for validating the performance of power couplers, a room temperature test stand was designed, constructed, and commissioned for the SHINE 1.3 GHz power couplers. In addition, a horizontal test cryostat was built to test the 1.3 GHz superconducting cavities, fundamental power couplers, tuners, and other components as a set. The results of these tests indicate that the 1.3 GHz couplers are capable of handling up to 14 kW continuous waves. Herein, the main aspects of the radio frequency design and construction of the test stand, along with the test results of the high-power conditioning of the 1.3 GHz couplers, are described.
Highlights
The Shanghai HIgh repetition rate XFEL aNd Extreme light facility (SHINE), which is under construction, is the first hard X-ray-free electronic laser facility in China [1,2,3]
One radio frequency (RF)-absorbing load connected to the circulator is used to absorb the RF power reflected from the test bench to protect the power source, and the other RF-absorbing load is used to absorb all the RF power reaching the terminal
The SHINE 1.3 GHz Fundamental power couplers (FPCs) was developed based on the XFEL TTF-III 1.3 GHz coupler with some modification and optimization, where the XFEL TTF-III 1.3 GHz coupler was designed for 1 MW pulsed power but generally was not operated at more than 1.5 kW average power
Summary
The Shanghai HIgh repetition rate XFEL aNd Extreme light facility (SHINE), which is under construction, is the first hard X-ray-free electronic laser facility in China [1,2,3]. The SHINE facility will build a superconducting linear accelerator with 8 GeV energy, three undulator lines, three beamlines, and the first 10 experimental stations [4]. The capacitor ring used for the bias voltage was replaced by a copper flex ring to provide a better RF seal between the waveguide and coupler body. Another change is the use of a stepper motor to remotely adjust the coupling for various beam loadings and to compensate for the change in the coupling due to heating of the inner conductor.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
