TY  - CONF
AU  - Lin, Z.Y.
AU  - Du, Y.-C.
AU  - Huang, G.
AU  - Huang, W.-H.
AU  - Sun, Z.
AU  - Tang, C.-X.
AU  - Tang, J.
AU  - Xu, Y.L.
AU  - Zhang, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - A Novel Microwave Switch-Based LLRF System for Long-Term System Phase Drift Calibration
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - 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.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3915
EP  - 3917
KW  - LLRF
KW  - controls
KW  - coupling
KW  - ISOL
KW  - experiment
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THPRB045
UR  - http://jacow.org/ipac2019/papers/thprb045.pdf
ER  - 

TY  - CONF
AU  - Lin, Z.Y.
AU  - Du, Y.-C.
AU  - Huang, G.
AU  - Huang, W.-H.
AU  - Sun, Z.
AU  - Tang, C.-X.
AU  - Tang, J.
AU  - Xu, Y.L.
AU  - Zhang, D.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - The Preliminary Long-Term Slow Drift Calibration Study in Low-Level Rf System
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - 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.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3918
EP  - 3920
KW  - LLRF
KW  - experiment
KW  - monitoring
KW  - timing
KW  - controls
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-THPRB046
UR  - http://jacow.org/ipac2019/papers/thprb046.pdf
ER  -