Electronic research on the high-sensitivity tune measurement system for CSRm

Background In the Heavy Ion Cooler-Storage-Ring Synchrotron in Lanzhou (HIRFL-CSR), the conventional beam tune measurement method employs high-performance and complex power amplifiers to excit beam, then acquires the beam tune by analyzing the spectrum of the Schottky detector. However, this method induces disturbance on the flying beam during the excitation, which may lead to beam loss or instability.

Purpose To address this limitation, the present study aims to develop a beam tune measurement system suitable for heavy-ion synchrotrons, to realize high-signal-to-noise ratio (SNR) measurement of the tune of low beam current without excitation.

Methods Based on the principle of diode detection circuits, this paper details the development of the tune measurement system, elaborating on the design philosophy and implementation of its front-end analog circuits. Online tune testing experiments were conducted on the HIRFL-CSR using ¹¹²Sn³³⁺ and ²³⁸U³⁵⁺ particle beams.

Results Experimental results demonstrate that the system can measure beam tune at low beam current and without excitation, achieving a signal-to-noise ratio of 30 dB.

Conclusions Compared to conventional heavy-ion accelerator beam tune measurement systems, this approach not only enables high-SNR measurement of low beam current without external excitation but also offers the advantages of structural simplicity and lower cost. This methodology holds potential for future extension into the field of heavy-ion accelerator beam position measurement.