IPAC2019 - List of Authors (Tang, J.)

Paper	Title	Page
THPRB045	A Novel Microwave Switch-Based LLRF System for Long-Term System Phase Drift Calibration	3915
	Z.Y. Lin, Y.-C. Du, W.-H. Huang, C.-X. Tang, J. Tang TUB, Beijing, People’s Republic of China G. Huang, Y.L. Xu LBNL, Berkeley, California, USA Z. Sun, D. Zhang HZCY Technologies Co., Ltd., Beijing, People’s Republic of China
	The long-term phase drift is one of the important issue for the stability of the Low level RF system. The signal crosstalk and temperature effect on the RF field detectors will significantly limited the performance of the phase detecting precise and the phase locking. A novel micro-wave switch-based LLRF system has been developed in Tsinghua accelerator lab. The microwave switch are ap-plied to in the chopper circuit to turn continuous signal into pulse signal in the time domain to avoid the mutual signal interference. In this paper the LLRF system based on microwave switch is present. The preliminary long-term experiments result shows the phase stability can achieve about 50fs RMS slow drift; and the peak-to-peak value of the slow drift was (~2°C p-p) over 4 days.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB045
About •	paper received ※ 22 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRB046	The Preliminary Long-Term Slow Drift Calibration Study in Low-Level Rf System	3918
	Z.Y. Lin, Y.-C. Du, W.-H. Huang, C.-X. Tang, J. Tang TUB, Beijing, People’s Republic of China G. Huang, Y.L. Xu LBNL, Berkeley, California, USA Z. Sun, D. Zhang HZCY Technologies Co., Ltd., Beijing, People’s Republic of China
	The phase drift of the RF signal in the low-level radio frequency (LLRF) system is observed in the long-term operation, which limits the performance and stability of the LLRF system. The long-term drift was reproduced in the lab. Its effect and sources of error were explored in the simple LLRF46 board and the simplest LLRF system. It is founded that the temperature will significantly lead to the phase distortion of the two signal channels, although with the same electron device. The distortion will finally cause the long-term drift with temperature floating. A fixed phase calibration signal (CAL signal) is applied to deal with the signal channels difference. The preliminary tests were conducted and the results were analysed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB046
About •	paper received ※ 22 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

A Novel Microwave Switch-Based LLRF System for Long-Term System Phase Drift Calibration

3915

Z.Y. Lin, Y.-C. Du, W.-H. Huang, C.-X. Tang, J. Tang
TUB, Beijing, People’s Republic of China
G. Huang, Y.L. Xu
LBNL, Berkeley, California, USA
Z. Sun, D. Zhang
HZCY Technologies Co., Ltd., Beijing, People’s Republic of China

The long-term phase drift is one of the important issue for the stability of the Low level RF system. The signal crosstalk and temperature effect on the RF field detectors will significantly limited the performance of the phase detecting precise and the phase locking. A novel micro-wave switch-based LLRF system has been developed in Tsinghua accelerator lab. The microwave switch are ap-plied to in the chopper circuit to turn continuous signal into pulse signal in the time domain to avoid the mutual signal interference. In this paper the LLRF system based on microwave switch is present. The preliminary long-term experiments result shows the phase stability can achieve about 50fs RMS slow drift; and the peak-to-peak value of the slow drift was (~2°C p-p) over 4 days.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB045

About •

paper received ※ 22 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRB046

The Preliminary Long-Term Slow Drift Calibration Study in Low-Level Rf System

3918

Z.Y. Lin, Y.-C. Du, W.-H. Huang, C.-X. Tang, J. Tang
TUB, Beijing, People’s Republic of China
G. Huang, Y.L. Xu
LBNL, Berkeley, California, USA
Z. Sun, D. Zhang
HZCY Technologies Co., Ltd., Beijing, People’s Republic of China

The phase drift of the RF signal in the low-level radio frequency (LLRF) system is observed in the long-term operation, which limits the performance and stability of the LLRF system. The long-term drift was reproduced in the lab. Its effect and sources of error were explored in the simple LLRF46 board and the simplest LLRF system. It is founded that the temperature will significantly lead to the phase distortion of the two signal channels, although with the same electron device. The distortion will finally cause the long-term drift with temperature floating. A fixed phase calibration signal (CAL signal) is applied to deal with the signal channels difference. The preliminary tests were conducted and the results were analysed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2019-THPRB046

About •

paper received ※ 22 April 2019 paper accepted ※ 21 May 2019 issue date ※ 21 June 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)