IBIC2015 - List of Authors (Podobedov, B.)

Paper	Title	Page
TUPB086	Observation of Ion-induced Instabilities at NSLS2 Storage Ring	557
	W.X. Cheng, Y. Li, B. Podobedov BNL, Upton, Long Island, New York, USA
	NSLS2 storage ring has been commissioned and is open for user operations. At relatively low beam current (~ 25mA) multi-bunch fills, ion-induced instabilities have been observed. For the present user operations, 150mA of total beam current is filled in ~1000 bunches, fast ion is the dominant instability at the NSLS2 storage ring. Although the ion-induced dipole motions can be suppressed using bunch by bunch (BxB) feedback system and it is expected to decrease in severity as the vacuum conditioning progresses further, a thorough understanding and characterization of this effect is still important, especially in preparation to the future 500mA operations. A number of ion instability related studies, mostly parasitic to other machine activities, have been carried out at various fill patterns and beam currents. Preliminary measurement results are reported in this paper.
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THALA02	Characterization of NSLS2 Storage Ring Beam Orbit Stability	625
	W.X. Cheng, K. Ha, J. Mead, B. Podobedov, O. Singh, Y. Tian, L. Yu BNL, Upton, Long Island, New York, USA
	Similar to other advanced third generation light sources, NSLS2 storage ring has stringent requirements on beam orbit stability. NSLS2 BPMs can be synchronously triggered to record turn by turn or fast acquisition 10kHz data. Spectrum of these data reveals various beam motion frequencies and it has been characterized at various machine conditions. Compared to the ground motion and utility system vibration spectra, beam motion introduced by the vibrations can be identified. An algorithm to locate possible noise sources from the measured spectrum has been developed. Preliminary results of locating orbit sources will be discussed in this paper as well.
	Slides THALA02 [2.776 MB]
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Paper

Title

Page

Observation of Ion-induced Instabilities at NSLS2 Storage Ring

557

W.X. Cheng, Y. Li, B. Podobedov
BNL, Upton, Long Island, New York, USA

NSLS2 storage ring has been commissioned and is open for user operations. At relatively low beam current (~ 25mA) multi-bunch fills, ion-induced instabilities have been observed. For the present user operations, 150mA of total beam current is filled in ~1000 bunches, fast ion is the dominant instability at the NSLS2 storage ring. Although the ion-induced dipole motions can be suppressed using bunch by bunch (BxB) feedback system and it is expected to decrease in severity as the vacuum conditioning progresses further, a thorough understanding and characterization of this effect is still important, especially in preparation to the future 500mA operations. A number of ion instability related studies, mostly parasitic to other machine activities, have been carried out at various fill patterns and beam currents. Preliminary measurement results are reported in this paper.

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

THALA02

Characterization of NSLS2 Storage Ring Beam Orbit Stability

625

W.X. Cheng, K. Ha, J. Mead, B. Podobedov, O. Singh, Y. Tian, L. Yu
BNL, Upton, Long Island, New York, USA

Similar to other advanced third generation light sources, NSLS2 storage ring has stringent requirements on beam orbit stability. NSLS2 BPMs can be synchronously triggered to record turn by turn or fast acquisition 10kHz data. Spectrum of these data reveals various beam motion frequencies and it has been characterized at various machine conditions. Compared to the ground motion and utility system vibration spectra, beam motion introduced by the vibrations can be identified. An algorithm to locate possible noise sources from the measured spectrum has been developed. Preliminary results of locating orbit sources will be discussed in this paper as well.

Slides THALA02 [2.776 MB]

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)