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C1952 Datasheet(PDF) 3 Page - PerkinElmer Optoelectronics |
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C1952 Datasheet(HTML) 3 Page - PerkinElmer Optoelectronics |
3 / 11 page 1000 1500 2000 2500 3000 1 E+09 1 E+08 1 E+07 1 E+06 1 E+05 1 E+04 1 E+03 1 E+02 Bias Voltage (V) Fig. 1: Typical current amplification 1000 1500 2000 2500 3000 1 E-05 1 E-06 1 E-07 1 E-08 1 E-09 1 E-10 1 E-11 1 E-12 Bias Voltage (V) Fig. 2: Typical anode dark current C 911 C 922 C 942 C 952 C 962 C 972 MAIN FEA TURES Compact Size The CPM is one of the smallest head- on type detectors, with a 10.5 mm diameter including encapsulation. The photocathode has a useful diameter of more than 5 mm. The tube is smal- ler, easier to use, and more rugged than discrete dynode types. Only a single high voltage supply of up to 3000 volts is necessary; no external voltage divider network is required. A variety of different sizes will be avai- lable soon (1/2” and 3/4”). Ultra high anode sensitivity At the maximum bias voltage of 3000 V, gains can exceed 108. At 2400 V, an- ode sensitivity is typically 3 x 106 A/W at a wavelength of 410 nm with a bi- alkali photocathode. This performan- ce surpasses conventional PMTs by one to two orders of magnitude and beats APDs by approximately five or- ders of magnitude (Fig. 1). Extremely low dark current The electron multiplication in the channel is virtually silent, so dark cur- rent depends only on the photoca- thode material, leakage currents are negligible. Bialkali photocathodes ex- hibit typical dark count rates of 10 cps at a gain of 3 x 108, while UV ca- thodes have dark count rates below 1 cps. In analog DC mode, the typical dark noise for a bialkali photocathode is 20 pA at a gain of 107. In general, the noise level of the PerkinElmer Optoelectronics CPM is one to two orders of magnitude lower than dyn- ode PMTs, resulting in a significant- ly higher dynamic range (Fig.2). Unpotted 1/3 inch Channel Photomultiplier |
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