On particle beam resonances and instabilities, or how to tame your synchrotron!

by Adrian Oeftinger (John Adams Institute for accelerator science, University of Oxford)

Thursday 27 Mar 2025, 14:00 → 15:00 Europe/Prague

Abstract: 

Space charge is a major performance limitation for hadron synchrotrons, e.g., at CERN, GSI, ISIS, SNS, CSNS, BNL, JPARC and FNAL. The interaction of the beam particles with the beam self-fields, which are typically nonlinear, leads to a betatron tune spread. This spread in the transverse particle oscillation frequencies increases with the bunch intensity, which eventually makes the bunch suffer from nearby betatron resonances. A maximum intensity, i.e., the space charge limit, is reached when these resonances excite the particle distribution to large enough amplitudes inducing beam loss. 

 

This talk reviews the key resonance mechanisms identified over the recent years, demonstrating them with modern modelling tools used for the prediction of the space charge limit. We then discuss compensation methods to increase the space charge limit. As a highlight we cover a recently published approach with pulsed electron lenses, which is currently pushed forward at the dedicated test facility IOTA (FNAL) and GSI.

 

 

 

The seminar will be held in the Dvořák hall, FZU, Pod Vodárenskou věží 1, Prague.

Location: https://goo.gl/maps/wEf7PsiLimSXMZhE9

 

The seminar will be also available via ZOOM video conference system:

Meeting ID: 674 9629 6646
Passcode: 575511

or join meeting via direct ZOOM link

 

slides.pdf

2025_03_27_Oeftiger.pdf