Speaker
Description
Synchrotron SOLEIL, located South of Paris, is a third-generation French synchrotron light source. Since 2007, it has delivered photon beams to 29 beamlines at currents of up to 500 mA, supporting 5,000 hours of user operation.
In 2021, as part of early preparation for the SOLEIL II upgrade, a Multipole Injection Kicker (MIK) was installed on the machine, leading to a drastic change in the location of electron losses during controlled and uncontrolled beam losses. After studying beam loss in several configurations, a new scheme for automated and manual beam dumps has been set up.
Later on, to replace manual beam scraping using slow scrapers insertion, a new and automatize methode of controlled beam dump has been developed. This methode consist on beam excitation bunch by bunch with the transverse feedback system and ensures a proper beam dump in roughly ten minutes without increasing the dose rate in radiation detectors too much or losing the RF system due to too fast stored current modification.
Another cause for high radiological doses is the electron’s losses during injection. An automatic approach for booster’s injection optimisation using Python's Xopt library is under development.
Eventually, for SOLEIL II the beam density will be so high that the risk of beam pipe damage or permanent magnet heat-up - thus demagnetisation - during uncontrolled beam loss must be taken into account in the beam loss scheme. The actual scheme involves fast beam size manipulation before beam kick and RF shutdown to allow quick beam loss for safety reasons and dump in the dedicated location.
The objective of this presentation is to summarise the work done on SOLEIL to ensure safe and reliable beam losses and dumps, and to present the plan for SOLEIL II in this regard.