GERMANY - JWGU

INSTITUT FÜR ANGEWANDTE PHYSIK (IAP)
JOHANN WOLFGANG GOETHE UNIVERSITÄT

Robert-Mayer-Strasse 2-4, D-60325 Frankfurt am Main
Postfach 111932, D-60054 Frankfurt am Main

Telephone: +49 69 798 23486
Telefax: +49 69 798 28510
E-mail: U.Ratzinger@iap.uni-frankfurt.de
            Horst.Klein@iap.uni-frankfurt.de
            rbecker@physik.uni-frankfurt.de
            A.Schempp@em.uni-frankfurt.de
URL:   http://www.physik.uni-frankfurt.de

Accelerator and Atomic Physics Division

Becker, Reinhard
Deitinghoff, Horst
Eichhorn, Ralf

Klein, Horst
Kleinod, Michael
Ratzinger, Ulrich

Schempp, Alwin
Tiede, Rudolf
Volk, Klaus

Research activities:
Ion Accelerators: Four Rod Radio Frequency Quadrupole Accelerators (RFQ) for protons, light and heavy ions, variable energy RFQ, injector for cyclotrons, funneling devices; rf structures for light and heavy ion postaccelerators, development of H-type drift tube linacs (IH-, CH-DTL): high efficiency, high duty cycle and cw operation, high beam currents, numerical calculations of electromagnetic fields, construction of prototypes, particle dynamics, rf and beam tests, IH-DTL for tumor therapy with heavy ions; investigation of H₂₁₀ mode cavity for particles with 0.1 < ß < 0.5, room temperature resonators for short pulse application, superconducting resonators for cw operation; direct electron beam drive for H-type ion accelerators

Beam Experiments: Beam test of RFQs with protons and heavy ions, coupling of two RFQs, funneling and chopping of ion beams; generation and transport of high intensity heavy ion beams, plasma physics experiments with heavy ion beams on solid targets; neutralization studies in beam transport lines with different optical elements: solenoids, bending magnets, Gabor plasma lens, time resolved measurements of compensation processes; emittance measurement of intense ion beams with non destructive methods; beam matching into RFQs.

Electron Beam Ion Source (EBIS) and Atomic Physics: Development of new EBIS devices for high electron currents to increase ion yield, improvements to the production of bare nuclei of heavier elements; use of partially compensated relativistic electron beams for an EBIS without magnetic focusing field; study of ion heating by electrons and ion cooling by lower charged ions, development of new applications: Medical EBIS, EBIS with internal penning trap; electron guns, development of special electron beam devices for electron-particle interaction in atomic physics

High Current Ion Sources: Development of plasma ion source (ion fraction with desired charge state ≥ 90%) and of a high efficiency ion source ''HIEFS''; development of a high current, high brilliance H^--source, investigation of different plasma confinements (solenoid, multi-cusp), influence of the source parameters on emittance and beam quality, development of high current D⁺ and Bi⁺ sources

Particle Optics and Beam Dynamics: Numerical calculation of electric and magnetic fields for charged particle optics and dynamics calculations; study of behaviour of intense beams with high space charge forces, space charge compensation and decompensation effects in optical elements, study of Gabor plasma lens; particle dynamics in linac design: emittance preservation, minimization of losses, halo detection; new focusing concepts: alternating phase focusing, KONUS dynamics, finger drift tubes; development and improvement of computer codes for charged particle optics and dynamics.