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| THPSC052 |
The Longitudinal Broadband Impedance and Energy Spread Measurements at VEPP-4M |
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- V.M. Borin, V.A. Kiselev, G.Y. Kurkin, O.I. Meshkov, S.A. Nikitin, M.A. Skamarokha
BINP SB RAS, Novosibirsk, Russia
- V.L. Dorokhov
BINP, Novosibirsk, Russia
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The paper presents studies of the longitudinal broadband impedance of VEPP-4M and measurements of its bunch energy spread at different energies in range of 1.45 - 3.5 GeV. In order to measure the longitudinal bunch size at different currents we used PS-1/S1 streak camera with picosecond temporal resolution. Considering that influence of collective effects is negligible at low currents we determined bunch energy spread from its length at low currents. Collected bunch length data demonstrate microwave instability thresholds and potential well distortion lengthening. Potential well distortion was studied at 3 GeV and 3.5 GeV. Measured potential well distortion lengthening was used to estimate a value of the reactive part of the longitudinal impedance. Observed microwave instability thresholds was used to measure the value of broadband impedance. Measured value of the VEPP-4M is 7.9 ± 1.5 Ohm.
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