CEM Models / Standard CEMs

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Typical gain at 2.3 kV applied voltage   1 x 10e8   Typical wall resistance Mohm 200   Pulse height distribution at 2.6 kV and 3.000 cps % <50   Dark count rate above a threshold of - 5 mV cps < 0.02   Maximum count rate cps 5 Mio   Typical pulse width (FWHM) at 2.3 kV nsec 8   Operating voltage kV max. 3.5   Temperature (operating and storage) °C max. 70   Bake temperature in vacuum °C max. 250                   The electro-optical specifications of the Standard type CEMs are valid for all models. Different are the sizes of the entrance funnels, the shapes of the funnels (round, rectangular or square) and the angles between funnels and the CEM bodies. The dark count rates depend on the CEM opening and are at a minimum for smaller openings. Figures 1 - 6 show typical data plots for the Standard CEMs measured with our test equipment.                           Selection Guide Standard Type CEMs     Circular Openings   Opening Model Model Model 5 mm Model name KBL 5RS KBL 5RS/45 KBL 5RS/90 10 mm Model name KBL 10RS KBL 10RS/45 KBL 10RS/90 15 mm Model name KBL 15RS KBL 15RS/45 KBL 15RS/90 20 mm Model name KBL 20RS KBL 20 RS/45 KBL 20RS/90 25 mm Model name KBL 25RS KBL 25RS/45 KBL25RS/90   Rectangular Openings   Opening     Opening 2 x 10 mm   5 x 10 mm Model name KBL 210   Model name KBL 510 4 x 8 mm   5 x 15 mm Model name KBL 408   Model name KBL 1505 5 x 5 mm   10 x 10 mm Model name KBL 505   Model name KBL 1010           Fig. 1 Typical output pulses at 2.5 kV applied voltage     Fig. 2 Typical gain characteristic     Fig. 3 Count rate vs. Applied voltage plot     Fig. 4 Gain vs. Count rate plot     Fig. 5 Typical PHD at 2.6 kV (3000 cps)   Fig. 6 Typical PHD vs. Applied voltage

Dr. Sjuts Optotechnik GmbH

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