München 2019 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 15: Poster session

AKBP 15.21: Poster

Thursday, March 21, 2019, 16:30–18:00, Durchgangshalle

Studies of Spill Ripple Compensation at Ion-Beam Therapy Synchrotrons — •Claude Krantz¹, Tobias Blumenstein¹, Uwe Scheeler¹, Max Rothenburger¹, Adrian Weber¹, Matthias Witt¹, Tobias Zinser¹, Rainer Cee², Fiona Faber², Eike Feldmeier², Michael Galonska², Stefan Scheloske², Christian Schömers², Andreas Peters², and Thomas Haberer² — ¹Marburger Ionenstrahl-Therapiezentrum, 35043 Marburg — ²Heidelberger Ionenstrahl-Therapiezentrum, 69120 Heidelberg

Slow extraction is a key technique in operation of ion synchrotrons for radiation therapy, where stable properties of the extracted beams on time scales of seconds to sub-milliseconds are of prime importance for successful application of the raster scanning method. Residual ripple of synchrotron magnet power supplies is a well-known source of fluctuations in the extracted particle rate. One way of mitigation is active stabilisation of the horizontal synchrotron tune using fast quadrupole magnets. A prototype of a fast air-core quadrupole lens, suited for all beam rigidities relevant for proton and carbon-ion beam therapy, has been set up at the Marburg (MIT) and Heidelberg (HIT) Ion-Beam Therapy Centres. Initial tests of the device at MIT and HIT have shown that power-grid related ripple in the spill intensity of both synchrotrons can be significantly reduced when active stabilisation of the horizontal betatron frequency is applied. We present results from these initial studies and discuss possible future clinical applications of the technique.