Index of content:
Volume 80, Issue 6, June 2009
- PARTICLE SOURCES, OPTICS AND ACCELERATION; PARTICLE DETECTORS
A compact electron beam ion source with integrated Wien filter providing mass and charge state separated beams of highly charged ions80(2009); http://dx.doi.org/10.1063/1.3125628View Description Hide Description
A Wien filter was designed for and tested with a room temperature electron beamion source (EBIS). Xenon charge state spectra up to the charge state were resolved as well as the isotopes of krypton using apertures of different sizes. The complete setup consisting of an EBIS and a Wien filter has a length of less than 1 m substituting a complete classical beamline setup. The Wien filter is equipped with removable permanent magnets. Hence total beam current measurements are possible via simple removal of the permanent magnets. In dependence on the needs of resolution a weak (0.2 T) or a strong (0.5 T) magnets setup can be used. In this paper the principle of operation and the design of the Wien filter meeting the requirements of an EBIS are briefly discussed. The first ion beam extraction and separation experiments with a Dresden EBIS are presented.
Electron spectroscopy using two-dimensional electron detection and a camera in a single electron counting mode80(2009); http://dx.doi.org/10.1063/1.3152366View Description Hide Description
A brief description is given of an economical implementation of the read out of a two-dimensional detector in an electron spectrometer by a charge coupled device camera, using a pulse counting mode. Count rates up to 10 kHz can be handled in this way. A comparison with results obtained using a resistive anodedetector is given for the case of electron scattering from Xe atoms. Good agreement was obtained between both detection techniques, establishing the validity of the method described here.
80(2009); http://dx.doi.org/10.1063/1.3152212View Description Hide Description
A time-gating scintillation detector, in which a fast high voltage switch is used for gating a channel photomultiplier, was developed for a measurement of laser-induced fast neutrons. The x rays generated from the intense femtosecond laser and the solid target interactions were suppressed selectively and a time-of-flight signal of a laser-generated fast neutron was measured effectively. The detector was used successfully to measure the neutron yield of a femtosecond, deuterated, polystyrene plasma.
80(2009); http://dx.doi.org/10.1063/1.3152336View Description Hide Description
The scheme of an internal injection of Au atoms into the working space of the “Krion-2” electron string ion source (ESIS) was applied and tested. In this scheme Au atoms are evaporated from the thin tungsten wire surface in vicinity of the source electron string. Ion beams with charge states up to were produced. Ion-ion cooling with use of C and O coolant ions was studied. It allowed increasing of the ion yield by a factor of 2. Ions of Kr up to charge state were also produced in the source. Electron strings were first formed with injection electron energy up to 6 keV. Methods to increase the ESIS ion output are discussed.