Three synchrotron radiation beam lines have been built on DAΦNE,the Frascati electron-positron accelerator.It is Possible to monitor and control all the elements on the beam lines using a modular network distributed ...Three synchrotron radiation beam lines have been built on DAΦNE,the Frascati electron-positron accelerator.It is Possible to monitor and control all the elements on the beam lines using a modular network distributed I/O system by National Instrunments (FieldPoint) with Bridge VIEW/Lab VIEW programs,Two of these beam lines have radiation safety problems solved by two independent and redundant systems,using mechanical switches ,and S7-200 PLC's by Siemens.In this article our solution will be described in details.展开更多
The pyrolysis of pyridine （5.26% pyridine in argon） was performed with tunable synchrotron vacuum ultraviolet photoionization and molecular-beam mass spectrometry technique at the temperature range of 1255-1765 K at...The pyrolysis of pyridine （5.26% pyridine in argon） was performed with tunable synchrotron vacuum ultraviolet photoionization and molecular-beam mass spectrometry technique at the temperature range of 1255-1765 K at 267 Pa. About 20 products and intermediates, containing major species H2, HCN, C2H2, C5H3N, C4H2, and C3H3N, were identified by near-threshold measurements of photoionization mass spectra and their mole fractions vs. temperatures were estimated. The major reaction pathways are analyzed based on the experimental observations.展开更多
In this paper,the slow orbit feedback system of HLS,including the feedback principle,the hardware,the software and the main operation results,is briefly introduced.With the help of slow orbit feedback system,the verti...In this paper,the slow orbit feedback system of HLS,including the feedback principle,the hardware,the software and the main operation results,is briefly introduced.With the help of slow orbit feedback system,the vertical orbit stability of HLS is better than 30 microns,which meets the requirement of synchrotron radiation users and is comparable with the international advanced level of orbit stability in the same kind of machines.展开更多
文摘Three synchrotron radiation beam lines have been built on DAΦNE,the Frascati electron-positron accelerator.It is Possible to monitor and control all the elements on the beam lines using a modular network distributed I/O system by National Instrunments (FieldPoint) with Bridge VIEW/Lab VIEW programs,Two of these beam lines have radiation safety problems solved by two independent and redundant systems,using mechanical switches ,and S7-200 PLC's by Siemens.In this article our solution will be described in details.
基金Ⅴ. ACKNOWLEDGMENTS This work was supported by the Chinese Academy of Sciences, the Natural Science Foundation of China （No.20533040）, the National Basic Research Program of China （973） （No.2007CB815204m）, and the Ministry of Science and Technology of China （No.2007DFA61310）.
文摘The pyrolysis of pyridine （5.26% pyridine in argon） was performed with tunable synchrotron vacuum ultraviolet photoionization and molecular-beam mass spectrometry technique at the temperature range of 1255-1765 K at 267 Pa. About 20 products and intermediates, containing major species H2, HCN, C2H2, C5H3N, C4H2, and C3H3N, were identified by near-threshold measurements of photoionization mass spectra and their mole fractions vs. temperatures were estimated. The major reaction pathways are analyzed based on the experimental observations.
文摘In this paper,the slow orbit feedback system of HLS,including the feedback principle,the hardware,the software and the main operation results,is briefly introduced.With the help of slow orbit feedback system,the vertical orbit stability of HLS is better than 30 microns,which meets the requirement of synchrotron radiation users and is comparable with the international advanced level of orbit stability in the same kind of machines.
