The Goethe University Frankfurt am Main was founded in 1914 and is organized since 2008 as a “foundation under public law”. This allows for a higher degree of autonomy, together with the potential of private sponsorship in addition to the financial support by the federal state of Hesse. Currently the university has more than 38.000 students and more than 550 full and associate professors. The general annual budget amounts to more than 300 million €, including more than 120 million € third-party funding.
The Institute of Applied Physics (IAP) belongs to the Physics Department of the Goethe University Frankfurt. Our working group is part of the IAP “Accelerator and Plasma Physics” division. The main research activities are related to the production, transport, acceleration and accumulation of intense proton and ion beams. Besides of more theoretical researches like beam dynamics designs and simulation code development, our group has gained a long term expertise in the design and construction of ion sources, room temperature and superconducting accelerator cavities, as well as the development of beam and plasma diagnostic devices and methods. The rf cavity development is on the one hand focused on radio frequency quadrupole (RFQ) structures (mostly of the “Four-Rod” type) and on the other hand on drift tube accelerators, in the more recent past mostly of H-type (IH-DTL and CH-DTL). More than 50 RFQ and more than 30 IH or CH-DTL structures were designed or delivered during the past decades within the framework of national or international collaborations with partners like GSI, CERN, DESY, FZ Jülich, BNL Brookhaven and ITEP Moscow, aiming for the setup of new or the upgrade of existing accelerator facilities.
Examples for recently designed or delivered accelerator structures are the RFQ and IH-DTL cavities for the Heavy Ion Cancer Therapy Facility in Heidelberg (HIT) and for the Italian hadron therapy centre CNAO, as well as the EBIS-linac for BNL-Brookhaven (for each of those projects an RFQ and an IH-cavity has been built and delivered). Moreover, IAP Frankfurt plays a leading part in the design and prototyping of the main accelerator components for the 70 MeV, 70 mA FAIR Facility Proton linac.
IAP has significant contributions to the research program and the results of the PDS-XADS and the IP-EUROTRANS projects in FP5 and FP6, respectively. Especially in the framework of IPEUROTRANS, the 17 MeV front end of driver linac designed by IAP has been approved as the reference design solution. Moreover, a CH prototype cavity has been built and successfully power tested under cryogenic conditions. This is the first multi cell superconducting cavity of that type worldwide. The achieved accelerating field gradients are considerable higher than the design values for IP-EUROTRANS and thus the assumed high performance of this novel type of accelerator structure could be confirmed.
- Holger Podlech
- Rudolf Tiede
- Alwin Schempp