Speaker
Mr
Christian Schömers
(HIT Betriebs GmbH am Universitätsklinikum Heidelberg)
Description
Slow extraction of particles out of a synchrotron is important for many applications in accelerator facilities, e.g. for ion therapy. It is desirable to keep the intensity at the beam-target as good as possible on a predefined level.
In the synchrotron of the Heidelberg Ion Therapy-Centre (HIT) transverse RF-knockout extraction is used to support the raster-scanning method for high-precision dose delivery.
As the phase-space distribution of particles is not homogeneous and varies slightly from pulse to pulse, intensity-fluctuations of the extracted beam appear.
The adjustment of the RF-knockout exciter is time consuming, as the energy range consists of more than 250 levels.
To keep the intensity on a predefined level, a feedback loop has been implemented.
The actual-value of the intensity is provided by ionisation chambers installed at the end of every beam line, the feedback loop controls the amplitude of the RF-knockout exciter.
The technical implementation and the requirements for the involved components are presented.
Tests for both, flat spill with a rectangular intensity profile as well as dynamically adapted intensity show promising results and are presented as well.
Author
Mr
Christian Schömers
(HIT Betriebs GmbH am Universitätsklinikum Heidelberg)
Co-authors
Mr
Andreas Peters
(HIT Betriebs GmbH am Universitätsklinikum Heidelberg)
Mr
Eike Feldmeier
(HIT Betriebs GmbH am Universitätsklinikum Heidelberg)
Dr
Jakob Naumann
(HIT Betriebs GmbH am Universitätsklinikum Heidelberg)
Mr
Ralf Panse
(KIRCHHOFF INSTITUTE FOR PHYSICS - UNIVERSITY OF HEIDELBERG)
Thomas Haberer
(Heidelberg Iontherapy Center)
