Details

Autor(en) / Beteiligte

• Pacilli, M
• Allegrini, P
• Girolami, M
• Conte, G
• Spiriti, E
• Ralchenko, V G
• Komlenok, MS
• Khomic, A A
• Konov, VI

Titel

Polycrystalline CVD diamond pixel array detector for nuclear particles monitoring

Ist Teil von

• Journal of instrumentation, 2013-02, Vol.7 (2), p.1-5

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report the super(90)Sr beta response of a polycrystalline diamond pixel detector fabricated using metal-less graphitic ohmic contacts. Laser induced graphitization was used to realize multiple squared conductive contacts with 1mm x 1mm area, 0.2 mm apart, on one detector side while on the other side, for biasing, a 9mm x 9mm large graphite contact was realized. A proximity board was used to wire bonding nine pixels at a time and evaluate the charge collection homogeneity among the 36 detector pixels. Different configurations of biasing were experimented to test the charge collection and noise performance: connecting the pixel at the ground potential of the charge amplifier led to best results and minimum noise pedestal. The expected exponential trend typical of beta particles has been observed. Reversing the bias polarity the pulse height distribution (PHD) does not changes and signal saturation of any pixel was observed around plus or minus 200V (0.4 V/ mu m). Reasonable pixels response uniformity has been evidenced even if smaller pitch 50 divided by 100 mu m structures need to be tested.