IBIC2014 - List of Authors (Morgan, A.F.D.)

Paper	Title	Page
WEPF25	A Fast Quadrupole Magnet for Machine Studies at Diamond	605
	A.F.D. Morgan, G. Rehm DLS, Oxfordshire, United Kingdom
	Fast quadrupolar magnets have been demonstrated in various schemes for increasing the coupled bunch instability thresholds, and for measuring the shift of transverse quadrupolar moment oscillation thus probing the transverse quadrupolar impedance. Due to machine upgrades, a ceramic vessel installed in the Diamond storage ring has become temporarily available for use. We decided to take advantage of this situation by designing and installing a simple air core quadrupole magnet which can operate at the fundamental quadrupolar frequencies (~212kHz for the horizontal and ~405kHz for the vertical plane). In the first instance we aim to use it to study the coupled bunch instability thresholds and quadrupolar tune shifts.
	Poster WEPF25 [1.359 MB]
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WEPD24	New Features and Measurements using the Upgraded Transverse Multibunch Feedback at Diamond	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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Paper

Title

Page

A Fast Quadrupole Magnet for Machine Studies at Diamond

605

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

Fast quadrupolar magnets have been demonstrated in various schemes for increasing the coupled bunch instability thresholds, and for measuring the shift of transverse quadrupolar moment oscillation thus probing the transverse quadrupolar impedance. Due to machine upgrades, a ceramic vessel installed in the Diamond storage ring has become temporarily available for use. We decided to take advantage of this situation by designing and installing a simple air core quadrupole magnet which can operate at the fundamental quadrupolar frequencies (~212kHz for the horizontal and ~405kHz for the vertical plane). In the first instance we aim to use it to study the coupled bunch instability thresholds and quadrupolar tune shifts.

Poster WEPF25 [1.359 MB]

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

WEPD24

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

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