Speaker
Mr
Matti Kalliokoski
(Helsinki Institute of Physics HIP)
Description
High resolution scanning system was used to locate the areas on GEM-foils that might contain short-circuit. These areas were analyzed by threshold method for fast identification. Different methods to remove short-circuits on GEM-foils were studied. Since using the standard procedure of “burning” shorts with high current might incur additional damage to the foil, we have also studied several non-destructive methods. These methods were for example washing with high power ultrasonic, manual extirpation and by using resonance frequencies. We will show results on locating and removing the GEM-shorts from standard bi-conical 10 cm × 10 cm foils.
Author
Mr
Matti Kalliokoski
(Helsinki Institute of Physics HIP)
Co-authors
Dr
Eija Tuominen
(Helsinki Institute of Physics)
Dr
Francisco Garcia
(Helsinki Institute of Physics)
Mr
Jouni Heino
(Helsinki Institute of Physics)
Mr
Pasi Karppinen
(University of Helsinki)
Mr
Raimo Turpeinen
(Helsinki Institute of Physics)
Mr
Rauno Lauhakangas
(Helsinki Institute of Physics)
Mr
Timo Hildén
(Helsinki Institute of Physics)
Dr
Timo Karppinen
(University of Helsinki)
