Progress in the development of photosensitive GEMs with resistive electrodes manufactured by a screen printing technology
✍ Scribed by V. Peskov; P. Martinengo; E. Nappi; R. Oliveira; G. Paic; F. Pietropaolo; P. Picchi
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 359 KB
- Volume
- 610
- Category
- Article
- ISSN
- 0168-9002
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✦ Synopsis
An innovative photosensitive gaseous detector, consisting of a GEM-like amplification structure with double-layered electrodes (instead of commonly used metallic ones) coated with a CsI reflective photocathode, is described. In one of our latest designs, the inner electrode consists of a metallic grid and the outer one is made of resistive strips; the latter are manufactured by a screen-printing technology on the top of the metallic strips's grid The inner metallic grid is used for 2-D position measurements whereas the resistive layer provides an efficient spark-protected operation at high gains close to the breakdown limit. Detectors with active areas of 10 Â 10 and 10 Â 20 cm 2 were tested under various conditions including the operation in photosensitive gas mixtures containing ethylferrocene or TMAE vapors.
The new technique could have many applications requiring robust and reliable large-area detectors for UV visualization, as for example, in Cherenkov imaging devices.