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2-D imaging with cascaded GEM/MHSP multipliers
| Content Provider | CERN Document Server |
|---|---|
| Author | Breskin, Amos Mörmann, D. Dos Santos, J. M. F. Veloso, J. F. C. A. Maia, J. M. Chechik, R. |
| Description | Presented at: JINST 2 (2007) P09008 |
| Abstract | The imaging properties of cascaded-GEM (Gas Electron Multiplier) and cascaded-GEM/MHSP (Micro-Hole and Strip Plate) gaseous electron multipliers, equipped with 2-D Wedge & Strip (W&S) readout electrodes, are presented. The W&S electrode was capacitively coupled to the electron multiplier through a resistive electrode, to adapt the charge-cloud size to the 1.6 mm readout pitch. The studies were carried out with soft X-rays and single UV-photons in Ar/5%CH4 gas mixture at atmospheric pressure. Spatial resolutions of 225μm and 250μm (FWHM) were reached, with 5.9 keV X-rays, in 3-GEM and 2-GEM/MHSP based detectors, respectively. Single photoelectrons, emitted from a CsI photocathode deposited on the top electrode of the first GEM in the cascade, were localized with resolution of 170μm (FWHM) in a 4-GEM gaseous photomultiplier. |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Detectors and Experimental Techniques |
| Content Type | Text |
| Resource Type | Article |
