L. J. Meng, X. Ma, V. V. Parkhomchuk, D. Yang, V. B. Reva, J. Li, L. J. Mao, X. M. Ma, T. L. Yan, J. W. Xia, Y. J. Yuan, H. S. Xu, J. C. Yang, G. Q. Xiao
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.
View original:
http://arxiv.org/abs/1202.2950
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