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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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THPSC074 |
Longitudinal Beam Distribution Measurements in Damping Ring of VEPP-5 Injection Complex |
705 |
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- V.V. Balakin, O. Anchugov, D.E. Berkaev, F.A. Emanov, G.Y. Kurkin, O.I. Meshkov
BINP SB RAS, Novosibirsk, Russia
- V.L. Dorokhov
BINP, Novosibirsk, Russia
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Injection Complex VEPP-5 was turned into operation in the end of 2015 in the Budker Institute of Nuclear Physics (Novosibirsk, Russia). The main task of the facility is production, acceleration and transportation of high intensity electron and positron beams for two BINP's colliders. Now, VEPP-5 successfully delivers electron and positron beams to the collider VEPP-2000 and ready to start operation with the acceleration complex VEPP-4M. Beam diagnostics issues are very important for VEPP-5 facility tuning during the operation. Longitudinal beam diagnostic based on synchrotron radiation in the VEPP-5 Damping Ring is presented in the article. Equipment operation principle, main measurement results and future prospects are presented in this paper.
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