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Johann Wolfgang Goethe Universitaet Frankfurt am Main (IAP), Germany

Website: http://www.uni-frankfurt.de

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.

IAP key persons involved in the MAX project:

Prof Dr Horst Klein is a well known personality in the accelerator physics community and the former head of the Institute of Applied Physics IAP in Frankfurt. Over more than four decades, he established accelerator physics at IAP and had a major contribution to the high reputation of our institute within the accelerator community. He initiated and continued numerous collaborations between IAP and accelerator facilities worldwide, like for example DESY (TESLA collaboration) GSI (contributions in many fields for the continuous upgrading of the GSI accelerator facility), RAL (ISIS upgrade), Los Alamos (RFQ and DTL development) and the Beijing University, as well as IAP contributions to international projects like ESS, IFMIF and EUROTRANS. Prof. Klein was the scientific coordinator of the IAP activities within the PDS-XADS project in FP5, as well as for the IP-EUROTRANS project in FP6. His scientific validation is expressed by long term memberships in many international committees, like for example the LINAC Conference advisory committee, the ECAART and the IAEA Conference program committee. Prof. Klein is Full Professor for experimental physics, was two times elected as dean of the faculty, has about 200 publications and has had more than 70 PhD students up to now.

Prof Dr Alwin Schempp is the group leader of the “RFQ” work group at IAP Frankfurt. He is an internationally accepted expert in the design and construction of Radio Frequency Quadrupole (RFQ) accelerator structures and the “inventor” of the Four-Rod type RFQ. Over more than three decades, Prof. Schempp designed and delivered more than 50 RFQ cavities for a large variety of applications (for pulsed and cw operation), as for example: RFQ as front end component of synchrotron injectors at GSI, DESY, RAL and Fermilab, for cyclotron injection (HMI Berlin) and for storage rings (MSI Stockholm); RFQ as accelerator component for ion implanter and heavy ion fusion; RFQ as decelerator structure (HITRAP at GSI); RFQ as accelerator component for ion cancer therapy (e.g. HIT Facility Heidelberg) etc. Prof. Schempp’s fruitful career as an accelerator physicist is evidenced by more than 350 scientific publications and longer research stays at Berkeley and Los Alamos. He is a popular lecturer and leads a large RFQ development students group since many years.

Private Lecturer Dr Holger Podlech is the group leader of the “LINAC” work group at IAP Frankfurt. He graduated at the “Max Planck Institute for Nuclear Physics” Heidelberg in 1999. After a research associate stay at the National Superconducting Cyclotron Laboratory (NSCL) of the Michigan State University (MSU) in East Lansing, MI, USA from 2000 to 2002, he joined IAP Frankfurt in 2002 and obtained his habilitation qualification in 2008. His main activities are in the field of rf accelerator design and construction, with a focus on superconducting rf cavities. Among the numerous accelerator projects he was involved in the following should be mentioned: CERN REX-ISOLDE, High Current Injector Heidelberg, the US Rare Isotope Accelerator (RIA), IFMIF, IPEUROTRANS, FAIR Proton Linac, the Frankfurt Neutron Source FRANZ.

Prof Dr Ulrich Ratzinger is the head of the Institute of Applied Physics IAP in Frankfurt. He is an internationally accepted expert in the design and construction of H-mode drift tube accelerator structures (IH-DTL and CH-DTL). He developed first rf resonators of this type in the 1980’ies as a PhD student in Munich, together with an adequate beam dynamics concept called “KONUS”. Meanwhile he designed or delivered more than 30 H-mode cavities (mostly IH-DTLs) for a large variety of applications, as for example: IH-DTLs as front end component of synchrotron injectors at GSI (High Charge State injector “HLI” and “High Current Injector” HSI), CERN (“Lead Injector”), and BNL (“EBIS Injector” for RHIC); IH-DTL as decelerator structure (HITRAP at GSI); IH-DTL as accelerator component for ion cancer therapy (e.g. HIT Facility Heidelberg) etc. Prof. Ratzinger holds a professorship in Frankfurt since the year 2000, being the successor of Prof. Klein in this position. He successfully preserved the existing know how and established IAP as an unique, internationally accepted university institute active in the field of accelerator physics.

Dr. Chuan Zhang has become a research fellow at Institute for Applied Physics, Goethe-University, since 2005. His research interests are focusing on new physics and technologies towards modern high power linacs at strong space-charge effects and high duty cycles. He made the beam dynamics design of a 17MeV, CW, intensity-variable up to 30mA injector for the EUROTRANS project. This design was accepted as the reference design, and he was awarded the Juan Antonio Rubio - Paul Govaerts EUROTRANS - ENEN Prize. Besides, he has also designed many other linacs, e.g. a 200mA proton RFQ, a 45-100mA upgradeable proton RFQ, a new EBIS-RFQ, and a 125mA, 40MeV deuteron DTL for the FRANZ, FAIR, BNL and IFMIF projects or institutes, respectively.

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