| Paper |
Title |
Page |
| PS16 |
The fast head-tail instability suppression in multibunch mode at VEPP-4M
|
138 |
| |
- G. Karpov, V. Kiselev, V. Smaluk, N. Zinvich
BINP, Budker Institute of Nuclear Physics, Novosibirsk, Russia
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In this paper the bunch-by-bunch transverse feedback
system for suppression fast head-tail as well as coupled
bunch instabilities is described. The experimental results
of the feedback affecting on the current threshold are
presented. The effects of reactive and resistive feedback
on the current threshold are discussed. Two times as large
the bunch current than the threshold current was obtained.
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| PT19 |
A method for measurement of transverse impedance distribution along storage ring
|
202 |
| |
- V. Kiselev, V. Smaluk
BINP, Budker Institute of Nuclear Physics, Novosibirsk, Russia
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| |
A new method for measurement of transverse couple
impedance distribution along storage ring is described.
The method is based on measuring of a closed orbit
deviation caused by local impedance. Transverse
impedance acts on the beam as a defocusing quadrupole,
strength of which depends on the beam current. If a local
bump of closed orbit has been created at the impedance
location, then the orbit deviation occurs while varying
the beam current. The local impedance can be evaluated
using the orbit deviation measured. Measurement
technique is described, the method accuracy is
evaluated. The method described was successfully used
for measurement of the impedance distribution along the
VEPP-4M storage ring.
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