Longitudinal Schottky spectra of a bunched Ne10+ ion beam at the CSRe

TL;DR

This study analyzes the longitudinal Schottky spectra of a bunched Ne10+ ion beam at CSRe, demonstrating momentum spread reduction, bunching modulation, and applications for beam lifetime measurement relevant to laser cooling and nuclear physics experiments.

Contribution

It introduces a new resonant Schottky pick-up for detailed analysis of bunched ion beams and explores its applications in beam cooling and lifetime measurements.

Findings

Reduced momentum spread in bunched ion beams.

Effective RF-bunching modulation at harmonic frequencies.

Schottky noise used for ultra-low intensity beam lifetime measurement.

Abstract

The longitudinal Schottky spectra of a radio-frequency (RF) bunched and electron cooled 22Ne10+ ion beam at 70 MeV/u have been studied by a newly installed resonant Schottky pick-up at the experimental cooler storage ring (CSRe), at IMP. For an RF-bunched ion beam, a longitudinal momentum spread of has been reached with less than 107 stored ions. The reduction of momentum spread compared with coasting ion beam was observed from Schottky noise signal of the bunched ion beam. In order to prepare the future laser cooling experiment at the CSRe, the RF-bunching power was modulated at 25th, 50th and 75th harmonic of the revolution frequency, effective bunching amplitudes were extracted from the Schottky spectrum analysis. Applications of Schottky noise for measuring beam lifetime with ultra-low intensity of ion beams are presented, and it is relevant to upcoming experiments on laser cooling of relativistic heavy ion beams and nuclear physics at the CSRe.