A5005770705- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Metal and Thin Film Mechanics
- Vacuum and Plasma Arcs
- Particle Accelerators and Free-Electron Lasers
- Atomic and Molecular Physics
- Electrostatic Discharge in Electronics
- Ion-surface interactions and analysis
- Superconducting Materials and Applications
- Mass Spectrometry Techniques and Applications
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Sensor Technologies Research
- Gyrotron and Vacuum Electronics Research
- Nuclear physics research studies
- Advanced Chemical Physics Studies
- Radiation Therapy and Dosimetry
- Radiation Effects in Electronics
- Electron and X-Ray Spectroscopy Techniques
- Advanced Surface Polishing Techniques
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Diamond and Carbon-based Materials Research
- Fusion materials and technologies
Research Association for Combustion Engines
1996-2018
GSI Helmholtz Centre for Heavy Ion Research
2003-2015
Gesellschaft für Elektrometallurgie (Germany)
2015
Technical University of Darmstadt
2004
GfK (Germany)
1991-2004
Gesellschaft Fur Mathematik Und Datenverarbeitung
2002
Goethe University Frankfurt
1996
Bound-state ${\mathrm{\ensuremath{\beta}}}^{\mathrm{\ensuremath{-}}}$ decay was observed for the fist time by storing bare $_{66}^{163}\mathrm{Dy}^{66+}$ ions in a heavy-ion storage ring. From number of $_{67}^{163}\mathrm{Ho}^{66+}$ daughter ions, measured as function time, half-life ${47}_{\mathrm{\ensuremath{-}}5}^{+5}$ d derived. By comparing this result with reported half-lives electron capture (EC) from ${\mathit{M}}_{1}$ and ${\mathit{M}}_{2}$ shells neutral $_{67}^{163}\mathrm{Ho}$,...
Secondary beams of radioactive heavy ions have been stored and cooled in a storage ring for the first time. Relativistic bare $^{19}\mathrm{Ne}$ $^{18}\mathrm{F}$ were produced by fragmentation 310 MeV/nucleon $^{20}\mathrm{Ne}$ at heavy-ion synchrotron GSI. They separated flight with high-resolution forward spectrometer injected into storage-cooler ring. The feasibilities in-flight lifetime direct mass measurements are demonstrated.
The Lyman \ensuremath{\alpha} transitions of hydrogenlike uranium associated with electron capture were measured in collisions stored bare ${\mathrm{U}}^{92+}$ ions gaseous targets at the storage ring ESR. By applying x-ray--particle coincidence techniques ground-state transition energies rest frame could be determined a precision about 600 ppm. experimental result is excellent agreement theroretical prediction for Lamb shift and already sensitive to 2s shift.
We report on measurements of the charge state distributions ions formed in a vacuum arc plasma magnetic field. A ion source was used for formation and beam extraction, spectra were investigated using both time-of-flight diagnostics. find that states all metal species are significantly increased by field up to 6 kG. New high created, mean distribution is about 30% at 3.75 kG 50% The results important fundamentally as well being relevance applications such implantation accelerator injection.
We report the first measurements on radiative and dielectronic recombination (RR DR) of very highly charged ions at energies ${\mathit{E}}_{\mathrm{cm}}$ as low 0 to 50 eV. Novel techniques were employed heavy-ion storage ring ESR obtain absolute rates ${\mathrm{Au}}^{76+}$(1${\mathit{s}}^{2}$2s). The increase RR rate for ${\mathit{E}}_{\mathrm{cm}}$\ensuremath{\rightarrow}0 could be recorded single DR resonances in...
A set of measurements with the CAPRICE ion source at GSI test bench has been carried out to investigate its behavior in terms intensity and shape extracted beam when microwaves generating plasma sweep a narrow range frequency (+/-40 MHz) around klystron center (14.5 GHz). Remarkable variations have observed depending on beamline operating parameters, confirming that dependent electromagnetic distribution is preserved even presence inside source. Moreover, these observations confirm tuning...
This paper reports first experimental data on radiative recombination of ions with free electrons and discusses a measurement rates U28+ which appears to contradict known theories.
The presence of background gas in the discharge chamber metal vapor vacuum arc source influences extracted beam. We have observed a strong influence pressure region on total beam current and charge state distribution metallic ions. Different gases been investigated together with different cathode materials. Up to 90% can be gaseous ions, depending injection conditions.
Beam profile measurements using viewing targets and emittance with pepper pot devices have established new insights about the ion beam extracted from an electron cyclotron resonance source (ECRIS). In our we compared two different ECRISs of CAPRICE type, one was equipped a standard 1.0T hexapole magnet, whereas for other stronger magnet flux density 1.2T has been installed. The resulting each individual charge state produced by focal strengths optical element can be used to estimate...
The status of experimental research, ongoing development, and upgrade the high current metal vapor vacuum arc ion source is presented. By applying a magnetic field in cathode region it possible to shift charge state distribution higher mean state. combination small meshes plasma drift used decrease beam noise improve stability. results experiments on stability with different fields, materials, mesh are presented discussed.
The beam extracted from the MEVVA ion source tends to be of a relatively high noise level, particularly for higher charge states, making transport difficult in accelerator application. This paper presents experimental results which show that use grids within combination with solenoidal magnetic field can decrease considerably. reduction explained by an increase plasma density due applied and space limitation current.
The Lyman and Balmer series in hydrogen-like Dy65+, along with radiative electron capture (REC) into bare Dy66+, have been observed. X-ray spectra were measured coincidence one-electron a beam of 292 MeV amu-1 Dy66+ stored the ESR storage ring interacting an internal argon gas target. REC line profile was studied detail good agreement theory, thus suggesting additional possibilities for spectroscopy.
To fill up the GSI heavy ion synchrotron (SIS) to its space charge limit with uranium ions, a vacuum arc source, based on metal vapor (MEVVA) IV has been developed and implemented into operation. The source proven capability in several long period beam times at high current injector GSI. With it was possible exceed of 15 mA U4+ ions entrance linear accelerator (UNILAC). reliability as well noise behavior improved such degree, that this can be used for injection an without objection. In...
High current metal ion production is a challenging task for source designers. The MEVVA has proven to be useful tool accelerator injection and implantation. We have investigated the in connection with GSI heavy accelerators. At Unilac as injector Synchrotron SIS (1 Hz 100 μs pulse length) can deliver mA beams of multiply charged ions up 3+ (or mass charge ratio ≤24 accepted by Unilac). 300 kV implantation facility used inject into RFQ duty cycles above 1%. Here we discuss beam currents state...
Demonstration of matching a laser ion source to the GSI RFQ-Maxilac linear accelerator and acceleration 1.8-mA current beam Ta 10+ ions up 45 keV/u energy is presented. A 10J/μs CO 2 has been used produce hot plasma plume, emitting highly charged tantulum ions. The correct geometry potential distribution section designed in accordance with results computer simulations by using AXCEL code. Measurements charge state accelerated indicate that it contains about 70% 30% 11+
The production of high-current ion beams metallic elements has been undertaken using a modified version the source CHORDIS. experiments were performed on both sites GSI, Darmstadt and Danfysik, Jyllinge. Two different methods tried: first, applying sputtering technique to targets made by elements, second, chlorination technique. proved be far superior in that metal beam obtained this way was very stable lifetime long.
Electron cyclotron resonance ion source with quasi-gas-dynamic regime of plasma confinement (ReGIS), constructed at the Institute Applied Physics, Russia, provides opportunities for extracting intense and high-brightness multicharged beams. Despite short lifetime in a magnetic trap ReGIS, degree multiple ionization may be significantly enhanced by increase power frequency applied microwave radiation. The present work is focused on studying beam quality this pepper-pot method. A single...
The extraction of ions from a plasma source has been investigated by computer simulation for many years. development these codes started the electron guns. ion sources positive was optimized soon after. Now with magnetic fields can be simulated (electron cyclotron resonance or PIG sources) and even three component plasmas (for example, H− modeled. necessary computing time shrunk hours to minutes seconds on modern main frames. Different applied techniques are presented. programs demonstrated...
A metal vapor vacuum arc type ion source has been developed for the high current injector at GSI accelerator facility production of charge state uranium beams. This provides a intensity beam with fraction fourfold charged ions up to 67% injection into linear accelerator. As part development and electron energy distributions have measured an electrostatic cylinder spectrometer device which discriminates particles different ratios. allows sensitive evaluation distribution. Energy various...