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MOPA22 |
Beam Position Measurement System in the Injector of HLS II | |
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Funding: Supported by the National Science Foundation of China (11175173, 11105141) A beam position monitor(BPM) system is being installed to improve the beam position measurement of the injector at the upgrade project of Hefei Light Source (HLS II). The new BPM system is consists of 19 stripline BPMs and 19 Libera Brilliance Single Pass modules. The parameters and placement of the stripline BPMs were carefully designed. A clock distribution system was built. An EPICS-based control and display system has been developed, including a new record type to calculate the beam position by log-ratio method. The performance of the electronic system is presented based on the laboratory tests as well as real beam test at HLS linac using existing BPMs. |
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| TUPA05 | The Calibration Factor Determined and Analysis for HLS Bunch Current Measurement System | 1 |
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Funding: Work supported by National Natural Science Project(11105141) and Chinese Universities Scientific Fund For bunch current measurement, the calibration factor is a key parameter. Usually, button electrode or stripline electrode can be selected as signal pickup, and peak value or integral of bunch signal from pickup can be used to calculate the related bunch current value. To obtain the absolute value of bunch current, the calibration factor should be determined with the help of DCCT. At HLS, the Stretch effect of bunch length was observed when bunch current decay over time and this will affect the performance of bunch current detection for different pickup type and calculate method. Theoretical analysis and experimental validation results are performed to find out an ideal solution for bunch current measurement at HLS. The results show that, bunch current measurement system can obtain the best performance by stripline and its integral signal. |
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