Gas avalanche pixel detectors

W. S. Hong, H. S. Cho, V. Perez-Mendez, J. Kadyk, N. Palaio

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We describe the structure and avalanche gain of gaseous pixel detectors. Each anode is a square 20 μm × 20 μm in size connected to an individual pad through a plated center section. The cathodes are plated squares interconnected to a common lead. The anode squares have a pitch of 200 μm in both x- and y- directions. The anodes and cathodes are aluminum layers deposited on amorphous silicon alloyed with carbon (a-Si:C:H) to produce a bulk resistivity of ∼1013 Ωcm. Measurements on signals from a group of anodes shows an avalanche gas gain close to 104 at a cathode-anode potential of 640 volts using a gas mixture of 50/50 argon-ethane. The avalanche gain is about a factor of 3 higher than that of microstrip devices we have tested, having the same pitch. For our initial measurements, 16 anodes were connected together to a charge sensitive preamplifier. In a final chamber each anode would be connected to an a-Si:H p-i-n readout diode with signals read out sequentially as in flat screen devices.

Original languageEnglish
Pages (from-to)1001-1005
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number3 PART 1
StatePublished - 1997


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