Article title: HOTCAP: A new software package for high-speed oscilloscope-based three-dimensional bunch charge and position measurement

HOTCAP：一个用于基于高速示波器的三维束团电荷和位置测量的新软件包

DOI：10.1007/s41365-021-00966-z

One sentence summary:

一句话概要：

User-friendly software is now available for high-speed oscilloscope-based 3D bunch charge and position measurement.

用户友好的软件现在可用于基于高速示波器的三维束团电荷和位置测量。

The Novelty (What)

创新性（主要内容）

This study developed HOTCAP, a free, user-friendly, and interactive software, for simultaneous measurement of 3D bunch-by-bunch position and charge from the waveform of a high-speed oscilloscope. Being able to operate on Windows 10, HOTCAP could also output injection transient analysis, bunch response function reconstruction, and turn-by-turn beam analysis. Its visual interface was developed based on PyQT5. HOTCAP was coded using Python on the backend, and its architecture comprised the user interface (UI) module, the calculation module, and the input-output (IO) module. Future studies shall improve the algorithm to eliminate HOTCAP’s current need for a constant bunch length.

本研究开发了一个免费的、用户友好的、交互式的软件Hotcap，用于从高速示波器的波形中同时测量三维束团的位置和电荷。 HotCap能够在Windows10上运行，还可以输出注入瞬态分析、束团响应函数重建和逐圈束流分析。 它的可视化界面是基于PYQT5开发的。 HotCap在后端使用Python进行编码，其体系结构包括用户界面(UI)模块、计算模块和输入输出(IO)模块。 未来的研究将改进该算法，以消除HotCap当前对恒定束长的需求。

The Background (Why)

研究背景（主要原因）

Bunch-by-bunch measurement includes transverse position measurements, longitudinal phase measurements, charge measurements, beam size measurements, and emittance. Among these, position measurement is the most important and common technique carried out via the random phase sampling method using a digital oscilloscope. However, since a large amount of input data and complex digital signal processing are involved, there is a high demand for comprehensive data processing algorithms or corresponding data processing software packages to be used in high-speed oscilloscope-based 3D bunch charge and position measurements. In order to fulfill the need, researchers from Shanghai Synchrotron Radiation Facility (SSRF) Beam Instrument Group have successfully developed HOTCAP (a visualization software package) to serve as an online measurement system that can simultaneously measure the bunch-by-bunch 3D position and strip the refilled charge signal. Other accelerators will benefit from this software as soon as the researchers share the source code in the near future.

逐束团测量包括横向位置测量、纵向相位测量、电荷测量、束流尺寸测量和发射度测量。 其中，位置测量是最重要和最常用的技术，通过数字示波器的随机相位采样方法来实现。 然而，由于涉及大量的输入数据和复杂的数字信号处理，在基于高速示波器的三维束团电荷和位置测量中，对综合的数据处理算法或相应的数据处理软件包提出了很高的要求。 为了满足这一需要，上海同步辐射装置束流仪器组的研究人员成功开发了HotCap（可视化软件包），作为一个在线测量系统，可以同时测量逐束团的三维位置和剥离补注电荷信号。 一旦研究人员在不久的将来分享源代码，其他加速器将从这个软件中受益。

The SDG impact (Big Why)

SDG影响力（研究意义）

SSRF strives to uphold its potential and reputation as a world-class state-of-the-art beam facility. To help achieve that, this research developed the first mature and free software package for high-speed oscilloscope-based three-dimensional (3D) bunch charge and position measurement. The output contributes to the advancement of beam diagnosis technology, which enhances the operation of synchrotron radiation facilities, realizing UNSDG 9: Industry, Innovation & Infrastructure.

SSRF努力维护其潜力和声誉，作为一个世界级的最先进的束流设施。 为了帮助实现这一目标，本研究开发了第一个成熟的自由软件包，用于基于高速示波器的三维(3D)束团电荷和位置测量。 该成果有助于束流诊断技术的进步，从而提高同步辐射设备的运行，实现UNSDG 9：工业、创新和基础设施。

研究课题组：

上海同步辐射光源束测组逐束团测量团队。从2009年开始研究逐束团测量技术，并在该领域做出多项成果。目前已发表期刊及会议文章四十余篇，有国际相关会议邀请报告2次、口头报告4次。主要团队成员来自上海应用物理研究所、上海高等研究院、中国科学技术大学等单位。