A tuning system for BEPC II

Abstract

A tuning system for BEPC * MI Zheng-Hui( ) 1,2;1) SUN Yi() 1,2 ZHANG Juan( ) 1,2 PENG Ying-Hua( ) 1,2

Tuner control system of Spoke012 SRF cavity for C-ADS injector I

“…According to Formula (1), the theoretical resolution of main stepping motor is 0.33nm/pulse. But the actual resolution is far lower than theoretical resolution due to installation errors and many other factors [4]. Fig.…”

“…The mechanical stepping motor tuner works at room temperature for a large adjustable frequency range about ±200kHz and the piezo tuner works at 2K environment for a small but rapid frequency adjustment. The main parameters of 325MHz tuner are listed in Table 1 [4]. The step angle of stepping motor (PKE596AC-HS50) is 0.009°/step which has been 80 subdivided by adjusting the motor driver.…”

Optical Noise Analysis in Dual-Resonator Structural Micro-Optic Gyro

“…In the resonance MOG, the fundamental detection limit 𝛿Ω is a key parameter to describe the system performance, and the resonance depth is a reverse ratio with 𝛿Ω. [7] Compared with these two experimental results, it is obviously proved that the dual-resonator structure can successfully improve the 𝛿Ω of the MOG, because of its effective suppression of the noises induced by Rayleigh backscattering, the Kerr effect and polarization coupling. The difference in the free spectrum range (FSR), which is the distance between the two resonance dips in Figs.…”

“…Some researchers built up a fiber optic gyro using an air-core photonic-bandgap fiber. [3−5] However, the configurations proposed previously do not have the appropriate method to eliminate the noise from Rayleigh backscattering, [6] the Kerr effect [7] and polarized coupling [8] simultaneously in MOG, greatly restricting its application in high precision fields. In this letter, a dual-resonator structure based micro-gyroscope is proposed.…”

Design and test of frequency tuner for a CAEP high power THz free-electron laser

“…As with other pulsed superconducting cavities, for example the 1.3GHz 9-cell cavity for ILC, each 4-cell cavity will be equipped with a slow tuner to compensate for static detuning and a fast tuner to compensate for the dynamic detuning due to the Lorentz force, beam loading effect, microphonics and liquid Helium pressure fluctuations. The slow tuner for the 4-cell cavity uses a normal stepper motor while the fast tuner employs piezo actuators [2][3] [4] . The 4-cell cavity are considerably stiffer than a 9-cell cavity for ILC and FEL, so the tuner must be capable of applying stronger force to the cavity flanges than the 9-cell cavity tuner.…”