Peskov,  Vladimir


Beyond the RICH: innovative photosensitive gaseous detectors for new fields of applications

P. Carlson 1, C. Iacobeaus 2, T.Francke 1,3, B. Lund-Jensen 1, L. Periale 4,5, V. Peskov 1, I. Rodionov 6

1 Royal Institute of Technology, Stockholm, Sweden 
2 Karolinska Institutet, Stockholm, Sweden 
3 XCounter AB, Danderyd, Sweden 
4 Torino University, Torino, Italy 
5 CERN, Geneva, Switzerland 
6 Reagent Research Center, Moscow, Russia


  We have developed and successfully used several novel designs of photosensitive detectors in various applications. They can be roughly divided in two main categories:

  1. hole-type multiplication structures with the cathodes and the inner walls coated with photosensitive materials;
  2. detectors with spectral sensitivities and geometrical features allowing to reduce the ion and photon feedbacks.

The main advantage of these detectors is that rather high gains (>104) can be achieved in a single multiplication step. This is possible by, for instance, exploiting the secondary electron multiplication and limiting the energy of the steamers by distributed resistivity. The single step approach simplifies the design of detectors not only for RICH, but for other applications as well. The single step approach also allows very good position resolution to be achieved in some devices: 50 μm "on line" without applying any treatment method (like central of gravity) can be obtained. Another feature of the new detectors is the ability to operate in pure noble gases.
  The main focus in our report is on new fields of applications for photosensitive detectors beside the RICH. In particular, we describe in detail the recent (yet unpublished) results obtained for the following new applications:

  1. detection of primary and secondary (due to multiplication inside liquids) scintillation light from LAr/Xe;
  2. detectors for sparks, flames, smoke, and dangerous gases;
  3. UV image scanner with a position resolution of 50 μm.

The results obtained demonstrate that the novel photosensitive gaseous detectors may strongly compete and in some applications are to superior to commercially available vacuum type detectors of UV radiation.


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