6 results about "Shunt impedance" patented technology

The application belongs to the technical field of strong current ion synchrotron, and relates to an accelerator slow extraction radio frequency excitation device, which comprises a digital programmable signal source, a microwave bridge, a power amplifier, an exciter and a high-power attenuator, the output end of the digital programmable signal source is connected with the input end of the microwave bridge, the output end of the microwave bridge is connected with the input end of the power amplifier, the output end of the power amplifier is connected with the input end of the exciter, the exciter is used for feeding radio frequency power to the pole plate of the exciter, the output end of the exciter is connected with the input end of the high-power attenuator, and the output end of the high-power attenuator is connected with the input end of the digital programmable signal source. The device has the functions of monitoring the output power of the power amplifier and whether the excitation pole plate works normally in real time, can realize high efficiency of slow extraction excitation (high transverse shunt impedance), and takes into account the working bandwidth.

The application provides a shunt calibrating method based on a network analyzer, comprising: calibrating the network analyzer by using a calibration standard part; connecting an open circuit device and a short circuit device which are made in the same structure as the measured shunt to the network analyzer to perform in-situ compensation for shunt impedance measurement; repeatedly measuring the measured shunt at a certain frequency to obtain measurement data of the measured shunt; measuring the phase angle measurement error of the network analyzer by using a mutual inductance standard part to calibrate the phase angle measurement result of the network analyzer; and performing statistical analysis and data processing on the measurement data to obtain the calibration result of the measured shunt after data correction. The method can realize the simultaneous calibration of AC / DC difference and phase angle of the shunt in the megahertz frequency range, expand the frequency range of the shunt calibration, and help to promote the research and application of the shunt in the high-frequency current, especially the pulse current measurement field.

The application discloses a transverse feedback excitation device with high shunt impedance and horizontal light extraction, and belongs to the technical field of particle accelerators. The device comprises a beam position probe (BPM), an RF front end, an ADC module, a digital signal processing module, a DAC module, a power divider, a power amplifier, a low-pass filter, an exciter (Kicker) and a matching load. The exciter Kicker has four electrode strips located on both sides of the beam center line and parallel to each other, two electrode strips on the same side are connected in parallel, the characteristic impedance of a single electrode strip is 100Ω, and the equivalent total characteristic impedance after parallel connection is 50Ω; the four electrode strips are distributed in a quadrangular symmetry in the cross section of the vacuum chamber and avoid the horizontal median plane, so as to form an open light path channel. The application improves the shunt impedance of the exciter, reduces the radio frequency power demand, realizes impedance matching with a standard 50Ω system, and guarantees the horizontal unobstructed extraction of the synchrotron radiation light.

This invention discloses a transverse feedback excitation device with high shunt impedance and horizontal light extraction, belonging to the field of particle accelerator technology. The device includes a beam position detector (BPM), an RF front-end, an ADC module, a digital signal processing module, a DAC module, a power divider, a power amplifier, a low-pass filter, an exciter (Kicker), and matching loads. The exciter (Kicker) has four parallel electrode strips located on both sides of the beam centerline, with two strips on the same side connected in parallel. Each electrode has a characteristic impedance of 100Ω, resulting in an equivalent total characteristic impedance of 50Ω after parallel connection. The four electrode strips are symmetrically distributed at the four corners within the vacuum chamber cross-section, avoiding the horizontal midplane to form an open optical path. This invention improves the shunt impedance of the exciter, reduces the RF power requirement, achieves impedance matching with a standard 50Ω system, and ensures unobstructed horizontal extraction of synchrotron radiation light.

The invention discloses a high-beta-interval multi-unit Pi mode standing wave high-frequency cavity based on improved coupling holes, and belongs to the field of particle accelerators. The multi-unit Pi mode high-frequency cavity comprises a high-frequency cavity body, the high-frequency cavity body is composed of seven waveguide walls, two end plates and six disc drift tubes, the seven waveguide walls are the first waveguide wall to the seventh waveguide wall respectively, the first waveguide wall is fixedly connected with the first end plate, the seventh waveguide wall is fixedly connected with the second end plate, and the disc drift tubes are connected with the second end plate. The six disc drift tubes are the first disc drift tube to the sixth disc drift tube, the disc drift tubes are fixedly connected with the waveguide wall in sequence, acceleration gaps are formed between the end plates and the disc drift tubes, and acceleration gaps are formed between the disc drift tubes. According to the high-beta-interval multi-unit Pi mode standing wave high-frequency cavity based on the improved coupling hole, the coupling hole is formed in the disc, so that the dispersion curve slope of the resonant cavity is increased, the interval between a working mode and other modes is increased, the field stability is achieved, the coupling hole is the improved coupling hole, the coupling coefficient is increased, and meanwhile the shunt impedance is not obviously reduced. According to the invention, the design frequency is 648MHz. The cavity shape is suitable for high beta (betagt; 0.5) proton accelerator, which is a standing wave acceleration cavity, and is simple in structure and convenient to process, install and debug.

The present invention relates to a single-photon detector (2000) comprising a low temperature region (LT) and a high temperature region (HT), wherein a temperature in the low temperature region (LT) is lower than a temperature in the high temperature region (HT), a superconducting nanowire (1100), a shunt impedance (2400) connected in parallel with the superconducting nanowire (1100), wherein the superconducting nanowire (1100) and the shunt impedance (2400) are both included in the low temperature region (LT). The invention further relates to a method (3000) for operating the single- photon detector (2000) so as to reduce measurement jitter.