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HITRAP Sintesi della relazione

Project ID: HPRI-CT-2001-50036
Finanziato nell'ambito di: FP5-HUMAN POTENTIAL
Paese: United Kingdom

A spectrometer for ion-surface interaction studies

The envisaged objective was to design and construct a particle detector for use with the Hitrap facility, offering a large range of flexibility for different kinds of application. The design focussed on the problem of low particle intensities expected from the Hitrap facility. In close collaboration with the Ioffe institute in St. Petersburg, a new type of electrostatic spectrometer for ion and electron detection was designed and constructed. A classical electrostatic analyser design with two bended plates (condenser-configuration) was unsuited since it either leads to very small opening angles and thus to low detection efficiencies, or to an unsatisfactory energy resolution.

The final spectrometer construction follows the Einzellens-principle, allowing for a large solid angle of 2Sr. This results in 10^4 higher efficiencies. The achieved energy resolution is with 1-2% by far satisfactory for the desired applications. As particle detector in the final version, an MCP assembly is foreseen. By this, the spectrometer size will be kept small in order to allow rotation around the collision centre inside the chamber. The spectrometer can detect particles with energies up to 3 keV/q. Slight changes regarding the electrical isolations allow the detection of 5 keV/q. These specifications make the detector well suited for measuring Auger and auto-ionization electrons from highly charged ions interacting with matter.

A high vacuum version of the detector is build and tested by the group at Ioffe institute. First tests with electron beams confirmed the simulated energy resolution. The construction of the UHV version is finished by now, all required detector components are ordered, and the spectrometer will be ready for testing and calibration at the KVI beginning 2006.

Informazioni correlate


Abel ROBIN, (Postdoc)
Tel.: +44-151-7943885
Fax: +44-151-7943870