Maximum tolerable space-charge tune shift in synchrotrons · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title
Maximum tolerable space-charge tune shift in synchrotrons
Plain
Rings tolerate only a limited spread of particle oscillation frequencies caused by space charge before losses grow; this limit is known only empirically.
Precise · changed · core
Revision 1: High-intensity synchrotrons operate with incoherent space-charge tune shift $\left|\Delta Q_{\mathrm{sc}}\right|$ up to approximately 0.2-0.5 over storage times of 1e3 to 1e5 turns. Derive, from the resonance structure of a given lattice and the periodic resonance crossing caused by synchrotron motion in a bunched beam, the maximal $\left|\Delta Q_{\mathrm{sc}}\right|$ compatible with emittance growth below 10 percent and loss below 1e-3 over $N$ turns, and compare with CERN PS and SPS, J-PARC and GSI SIS18 data.
Revision 2: High-intensity synchrotrons operate with incoherent space-charge tune shift $\left|\Delta Q_{\mathrm{sc}}\right|$ up to approximately 0.2-0.5 over storage times of $10^{3}$ to $10^{5}$ turns. Derive, from the resonance structure of a given lattice and the periodic resonance crossing caused by synchrotron motion in a bunched beam, the maximal $\left|\Delta Q_{\mathrm{sc}}\right|$ compatible with emittance growth below 10 percent and loss below $10^{-3}$ over $N$ turns, and compare with CERN PS and SPS, J-PARC and GSI SIS18 data.
Settled by
A scaling law or simulation that matches measured limits in at least three rings with differing lattices and storage times.
Kind
well-posed
Answer type
value
References
(empty)
Literature status
open
Status note
(empty)
Posed since
(empty)

Decisions