Author: Feldmeier, E.
Paper Title Page
THPVA082 Multi-Energy Trial Operation of the HIT Medical Synchrotron: Accelerator Model and Data Supply 4644
 
  • M. Galonska, E. Feldmeier, Th. Haberer, A. Peters, C. Schömers
    HIT, Heidelberg, Germany
 
  At the Heidelberg ion beam therapy center (HIT) cancer patients are treated with the raster-scanning dose delivery method of heavy ion pencil beams. The beams are provided by a synchrotron which allows for a variation of the ion penetration depth by changing the ion beam energy for each synchrotron cycle. In order to change the beam energy within one synchrotron cycle the accelerator model and data supply model within the control system have been extended extensively. In this first data supply model beam re-acceleration or deceleration between two arbitrary extraction energies is defined. The model defines an additional transition phase, i.e. current/set value patterns between extraction and the re-acceleration yet giving the possibility of setting the beam properties suitable for further acceleration/deceleration. This includes the dipoles, correctors, quadrupoles, sextupoles, KO-Exciter (spill break), and RF. This allowed for the survey and optimisation of the beam properties including possible beam losses of the re-accelerated, transversally blown up beam for arbitrary energy levels.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA082  
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THPVA083 First Tests of a Re-accelerated Beam at Heidelberg Ion-Beam Therapy Centre (HIT) 4647
 
  • C. Schömers, E. Feldmeier, M. Galonska, Th. Haberer, J.T. Horn, A. Peters
    HIT, Heidelberg, Germany
 
  In the active raster scanning method performed at HIT since 2009, tumors are irradiated slice-by-slice by changing the extraction energy. The synchrotron provides a library of 255 different extraction-energy levels per ion type, according to the aimed penetration depth. So far, a new synchrotron cycle is started for each iso-energy-slice resulting in a non-optimal duty cycle. In order to reduce treatment time and to increase the number of patients treated per day, synchrotron cycles with several extraction flattops on different energy levels are planned. After completing one iso-energy-slice, remaining particles will be reaccelerated to the adjacent level. As a first test a new data supply model generating patterns for power supplies and RF devices with two different extraction flattops has been implemented recently. The properties of the reaccelerated beam are now under detailed examination. The reaccelerated beam was successfully extracted and guided to the experimental area. Ionization chambers along the beam line clearly show two spills on two different extraction flattops. The desired change of beam energy has been verified by range measurements in a water column.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA083  
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