Linac Design within HITRIplus for Particle Therapy

Within the EU Horizon 2020 programme a linac was designed, which is starting from the concept as used at the 4 European cancer therapy centers applying light ions up to carbon. The new linac will in its simpliest version allow ion beam injection into synchrotrons at 5 A MeV, with high beam transmission and allowing currents up to 5 mA 𝛼 - particles. An advanced ECR – ion source will inject into an RFQ – IH-DTL combination. The DTL concept allows upgraded versions for A/q – values up to two and with beam energies of 7.1 A MeV from IH – tank2 and 10 A MeV from IH-tank3. The higher beam injection energies for light ions allow for relaxed synchrotron operation conditions at lowest magnetic field levels. A main argument for the DTL extensions however is an additional linac function as radioisotope facility driver. The 7.1 A MeV are especially defined for the clean production of $^{211}$At, which may play a future role in cancer therapy. The linac will allow for high duty-factors – up to 10%, to fulfil the needs for efficient radioisotope production. Solid state amplifiers with matched design RF power levels (up to 600 kW for IH3) will be used.