IBIC2014 - List of Keywords (damping)

Paper	Title	Other Keywords	Page
MOPD05	Dual Transverse and Longitudinal Streak Camera Imaging at ELSA	cavity, diagnostics, synchrotron, electron	144
	M.T. Switka, F. Frommberger, P. Hänisch, W. Hillert, M. Schedler ELSA, Bonn, Germany
	Funding: Funded by the German Research Foundation (DFG) within Colaborative Research Center (SFB/TRR) 16 The electron pulse stretcher ring ELSA located at Bonn University provides 0.5 – 3.5 GeV polarized and non-polarized electron beams for external experimental stations. A streak camera system has been installed to capture time resolved images of beam dynamics ranging from nanoseconds to several milliseconds. Particular attention was drawn to the capability of simultaneous imaging of both transverse beam dimensions, hence providing information of all spatial dimensions in one synchroscan or slow sweep measurement. Incoherent and coherent beam instabilities, especially at high stored beam currents, are subject of analysis due to the planned intensity upgrade towards 200 mA for standard operation. The current resolution performance of the imaging system and machine relevant measurements are presented.
	Poster MOPD05 [6.133 MB]
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WEPD24	New Features and Measurements using the Upgraded Transverse Multibunch Feedback at Diamond	feedback, betatron, experiment, FPGA	696
	G. Rehm, M.G. Abbott, A.F.D. Morgan DLS, Oxfordshire, United Kingdom
	A Transverse Multi-Bunch Feedback has been used in the Diamond Storage Ring for the stabilization of instabilities since 2007. Following a recent upgrade of the FPGA code and EPICS layer, a set of new features is now available to support operation and machine development: Firstly, a bunch by bunch choice of feedback filter allows for better stabilization of a single high charge bunch in a hybrid fill pattern. Secondly, complex grow-damp experiments are now possible using a sequencer of internal states allowing precise measurements of the damping rates on a mode by mode basis. Thirdly, a phase locked loop excitation and detection has been implemented to allow both extremely fast (kHz update rates) and extremely precise tracking of the betatron tune frequencies. Finally, short FIR filters on the ADC input and DAC output enable a fine tuning of the impulse response to provide maximum bunch to bunch isolation, as for instance required for efficient bunch cleaning.
	Poster WEPD24 [1.977 MB]
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WEPD26	Bunch-by-Bunch Feedback Systems at the DELTA Storage Ring used for Beam Diagnostics	feedback, storage-ring, laser, radiation	703
	M. Höner, S. Khan, M. Sommer DELTA, Dortmund, Germany
	Funding: Work supported by the BMBF. At the 1.5-GeV electron storage ring DELTA operated by the TU Dortmund University, a bunch-by-bunch feedback system was installed in 2011. Since then, it is in operation for different beam diagnostic purposes. A fast analysis of bunch-position data allows a real-time multibunch mode analysis during machine operation. In addition, the data analysis can be triggered by external events, e.g. beam losses or the injection process. In this paper, a feedback-based method to measure the damping times of multi-bunch modes is presented. Furthermore, a chromaticity-dependent single-bunch instability is analyzed. Finally, the use of the feedback system in the presence of an RF-phase modulation is presented.
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THCXB2	Performance Evaluation of the Intra-Bunch Feedback System at J-PARC Main Ring	feedback, simulation, betatron, experiment	727
	K.G. Nakamura Kyoto University, Kyoto, Japan Y.H. Chin, T. Koseki, H. Kuboki, M. Okada, M. Tobiyama KEK, Ibaraki, Japan Y. Shobuda JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan T. Toyama J-PARC, KEK & JAEA, Ibaraki-ken, Japan
	Intra-bunch feedback system in J-PARC (Japan Proton Accelerator Complex) Main Ring(MR) has been developed for suppression of head-tail motion and reduction of beam loss. This system consists of mainly BPM, signal processing circuit (iGp12), power amplifiers, and stripline kickers. These components were fabricated and installed in April of 2014. This system succeeded in suppressing the internal bunch motion caused by injection kicker error in the 3GeV constant-energy operation, and showed shorter damping time compared to the bunch by bunch feedback system, which is currently working in the normal operation. In this paper, we will report the performance of the system by comparison with simulations.
	Slides THCXB2 [6.430 MB]
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Paper

Title

Other Keywords

Page

MOPD05

Dual Transverse and Longitudinal Streak Camera Imaging at ELSA

cavity, diagnostics, synchrotron, electron

144

M.T. Switka, F. Frommberger, P. Hänisch, W. Hillert, M. Schedler
ELSA, Bonn, Germany

Funding: Funded by the German Research Foundation (DFG) within Colaborative Research Center (SFB/TRR) 16
The electron pulse stretcher ring ELSA located at Bonn University provides 0.5 – 3.5 GeV polarized and non-polarized electron beams for external experimental stations. A streak camera system has been installed to capture time resolved images of beam dynamics ranging from nanoseconds to several milliseconds. Particular attention was drawn to the capability of simultaneous imaging of both transverse beam dimensions, hence providing information of all spatial dimensions in one synchroscan or slow sweep measurement. Incoherent and coherent beam instabilities, especially at high stored beam currents, are subject of analysis due to the planned intensity upgrade towards 200 mA for standard operation. The current resolution performance of the imaging system and machine relevant measurements are presented.

Poster MOPD05 [6.133 MB]

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WEPD24

New Features and Measurements using the Upgraded Transverse Multibunch Feedback at Diamond

feedback, betatron, experiment, FPGA

696

G. Rehm, M.G. Abbott, A.F.D. Morgan
DLS, Oxfordshire, United Kingdom

A Transverse Multi-Bunch Feedback has been used in the Diamond Storage Ring for the stabilization of instabilities since 2007. Following a recent upgrade of the FPGA code and EPICS layer, a set of new features is now available to support operation and machine development: Firstly, a bunch by bunch choice of feedback filter allows for better stabilization of a single high charge bunch in a hybrid fill pattern. Secondly, complex grow-damp experiments are now possible using a sequencer of internal states allowing precise measurements of the damping rates on a mode by mode basis. Thirdly, a phase locked loop excitation and detection has been implemented to allow both extremely fast (kHz update rates) and extremely precise tracking of the betatron tune frequencies. Finally, short FIR filters on the ADC input and DAC output enable a fine tuning of the impulse response to provide maximum bunch to bunch isolation, as for instance required for efficient bunch cleaning.

Poster WEPD24 [1.977 MB]

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WEPD26

Bunch-by-Bunch Feedback Systems at the DELTA Storage Ring used for Beam Diagnostics

feedback, storage-ring, laser, radiation

703

M. Höner, S. Khan, M. Sommer
DELTA, Dortmund, Germany

Funding: Work supported by the BMBF.
At the 1.5-GeV electron storage ring DELTA operated by the TU Dortmund University, a bunch-by-bunch feedback system was installed in 2011. Since then, it is in operation for different beam diagnostic purposes. A fast analysis of bunch-position data allows a real-time multibunch mode analysis during machine operation. In addition, the data analysis can be triggered by external events, e.g. beam losses or the injection process. In this paper, a feedback-based method to measure the damping times of multi-bunch modes is presented. Furthermore, a chromaticity-dependent single-bunch instability is analyzed. Finally, the use of the feedback system in the presence of an RF-phase modulation is presented.

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THCXB2

Performance Evaluation of the Intra-Bunch Feedback System at J-PARC Main Ring

feedback, simulation, betatron, experiment

727

K.G. Nakamura
Kyoto University, Kyoto, Japan
Y.H. Chin, T. Koseki, H. Kuboki, M. Okada, M. Tobiyama
KEK, Ibaraki, Japan
Y. Shobuda
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan

Intra-bunch feedback system in J-PARC (Japan Proton Accelerator Complex) Main Ring(MR) has been developed for suppression of head-tail motion and reduction of beam loss. This system consists of mainly BPM, signal processing circuit (iGp12), power amplifiers, and stripline kickers. These components were fabricated and installed in April of 2014. This system succeeded in suppressing the internal bunch motion caused by injection kicker error in the 3GeV constant-energy operation, and showed shorter damping time compared to the bunch by bunch feedback system, which is currently working in the normal operation. In this paper, we will report the performance of the system by comparison with simulations.

Slides THCXB2 [6.430 MB]

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