TY - CPAPER
AU - Rehm, G.
AU - Abbott, M.G.
AU - Morgan, A.F.D.
TI - New Features and Measurements using the Upgraded Transverse Multibunch Feedback at Diamond
J2 - Proc. of IBIC2014
AB - 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.
PB - JACoW
CY - Geneva, Switzerland
SP - 696
EP - 699
KW - feedback
KW - damping
KW - betatron
KW - experiment
KW - FPGA
DA - 2014/10
PY - 2014
SN - 978-3-95450-141-0
UR - http://jacow.org/IBIC2014/papers/wepd24.pdf
ER -