Abstract
A software package to be used in high-speed oscilloscope-based three-dimensional bunch-by-bunch charge and position measurement is presented. The software package takes the pick-up electrode signal waveform recorded by the high-speed oscilloscope as input, and it calculates and outputs the bunch-by-bunch charge and position. In addition to enabling a three-dimensional observation of the motion of each passing bunch on all beam position monitor pick-up electrodes, it offers many additional features such as injection analysis, bunch response function reconstruction, and turn-by-turn beam analysis. The software package has an easy-to-understand graphical user interface and convenient interactive operation, which has been verified on the Windows 10 system.
Highlights
New-generation synchrotron radiation light sources have the following basic characteristics: ultra-low beam emittance, ultra-high beam stability, high average beam current ( [ 300 mA), a small-aperture beam vacuum pipe (\30 mm in diameter), a large number of vacuum inserts, top-up operation mode, small dynamic aperture, and high time resolution experimental ability [1, 2]
A software package to be used in high-speed oscilloscope-based three-dimensional bunch-by-bunch charge and position measurement is presented
Based on the cross-correlation method, the Shanghai Synchrotron Radiation Facility (SSRF) Beam Instrument Group has studied a set of signal processing algorithms for high-speed oscilloscope-based 3D bunch charge and position measurement and released a visualization software package called HOTCAP
Summary
New-generation synchrotron radiation light sources have the following basic characteristics: ultra-low beam emittance (a few nmrad or even tens of pmrad), ultra-high beam stability (with orbital feedback control accuracy being mostly at the micrometer or submicrometer level), high average beam current ( [ 300 mA), a small-aperture beam vacuum pipe (\30 mm in diameter), a large number of vacuum inserts, top-up operation mode, small dynamic aperture, and high time resolution experimental ability (of the order of picoseconds) [1, 2]. Using bunch-bybunch measurement technology enables accurate beam diagnosis for each bunch rather than just for the average status of all bunches This is beneficial for the operating staff to better understand the operating status of the device, facilitating targeted optimization to ensure that the synchrotron radiation device has a better light supply quality [3,4,5]. The phase-locked sampling method with an external clock is usually based on a commercial bunch-by-bunch feedback system or a highspeed acquisition board. The random phase sampling method with a constant frequency is usually based on a digital oscilloscope. Based on the cross-correlation method, the Shanghai Synchrotron Radiation Facility (SSRF) Beam Instrument Group has studied a set of signal processing algorithms for high-speed oscilloscope-based 3D bunch charge and position measurement and released a visualization software package called HOTCAP.
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