Test of detuning system for dielectronic recombination experiment at CSRm

TL;DR

This paper reports on testing a detuning system for dielectronic recombination experiments at CSRm, analyzing its effects on ion beam stability and the underlying plasma oscillation phenomena.

Contribution

It introduces a detuning system for precise energy control in DR experiments and investigates its influence on beam performance and oscillation behavior.

Findings

Small pulse height results match theoretical predictions.

Short pulse width reduces frequency shift in Schottky spectra.

Large pulse height causes oscillations dependent on pulse width and beam intensity.

Abstract

The storage ring equipped with an electron cooler is an ideal platform for dielectronic recombination (DR) experiments. In order to fulfil the requirement of DR measurements at the main Cooler Storage Ring, a detuning system for the precision control of the relative energy between the ion beam and the electron beam has been installed on the electron cooler device. The test run using 7.0 MeV/u C6+ beam was performed to examine the influence of this system on the performance of the stored ion beam. The Schottky spectra and the ion beam currents were recorded to monitor the beam status. The influence of pulse heights and widths of the detuning voltage on the ion beam was investigated. For the small pulse height, the experimental results from the Schottky spectrum were in good agreement with the theoretical results. The frequency shift in the Schottky spectrum is significantly reduced for the short pulse width. For the large pulse height, an oscillation phenomenon was observed. From the Schottky spectrum, we found the oscillation amplitude is dependent on the pulse width of detuning and the ion beam intensity. The detailed description of the phenomenon and the theoretical model based on the plasma oscillation was discussed in this paper.