Estimate of Coherent Tune Shifts for PEP
نویسندگان
چکیده
منابع مشابه
Tune Feed-forward for Pep-ii*
The PEP-II B-Factory achieved design performances in 2000. The tune shifts of the rings are already about twice the design numbers of 0.03. This requires constant adjustments from the operators during fills and top-offs. A tune feedback was envisioned first, but the wide, multi-peaked tune signals make it tricky even for a human to adjust the tunes correctly. Since tunes are strongly correlated...
متن کاملSpace Charge Effects - Tune Shifts and Resonances
Resonances in the Presence of the Space Charge Force . . . . . . 3.1 Equations of Motion . . . ; . . . . . . . . . . . . . . . . . 3.2 Amplitude Dependence of the Tune . . . . . . . . . . . . . 3.3 Particle Behavior under Resonance and Space Charge Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4 Resonance Phase Space Structure with No Space Charge . . 3.5 Resonance Phase Spac...
متن کاملUpdated Impedance Estimate of the Pep-ii Rf Cavity
This paper presents an updated estimate of the higher-order mode impedance spectrum of the RF cavities for the PEP-II B-factory. The cavity is designed for continuous operation at 476 MHz with up to 150 kW wall dissipation and heavy beam loading. To reduce the growth rates of coupled-bunch instabilities the cavity higher-order modes are damped by three rectangular waveguides and broad-band load...
متن کاملMeasurements of SPS Single - Bunch Coherent Tune Shifts and Head - Tail Growth Rates in the Year 2001
Measurements of transverse oscillations of single bunches of protons in the SPS at 26 GeV are described. They are used to monitor the transverse impedance of the SPS. There has been a major effort to reduce the SPS impedance in the last winter shutdown, by shielding of most pumping ports and removal of obsolete (lepton) components. In fact, a significant reduction in the coherent tune shift wit...
متن کاملMeasurements of Tune Shifts with Amplitude at Lep
The beam orbit system of the LEP electron-positron collider is able to store the beam position over 1000 turns following a deflection by a horizontal kicker. A precise analysis of such 1000-turn data for many beam position monitors was used to study the dependence of the tune on the horizontal amplitude. The horizontal tune shift with amplitude was determined from the decay of the beam oscillat...
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ژورنال
عنوان ژورنال: IEEE Transactions on Nuclear Science
سال: 1981
ISSN: 0018-9499
DOI: 10.1109/tns.1981.4331760