CEM Models / Arrays
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Characteristics of CEMs in Arrays

 

 

 

 

 

Dr. Sjuts Optotechnik GmbH
Rudolf-Wissell-Str. 14, 37079 Goettingen, Germany Tel. + 49 (0) 551 209 95 62, Fax. + 49 (0) 551 209 95 63, Email: sjuts@t-online.de
  Standard CEMs    
  Typical gain at 2.3 kV applied voltage
1 x 10e8
  Typical wall resistance / channel Mohm 200
  Pulse height resolution at 2.6 kV and 3.000 cps % < 40
  Dark count rate above a threshold of - 5 mV / channel cps < 0.02
  Maximum count rate / channel cps 5 Mio
       
  Extended Dynamic Range type CEMs    
  Typical gain at 2.8 kV applied voltage   1 x 10e8
  Typical wall resistance / channel MOhm 60
  Pulse height resolution at 2.8 kV and 3.000 cps % <80
  Dark count rate above a threshold of - 5 mV / channel cps
< 0.02
  Maximum count rate / channel
cps
15 Mio
   
   
 

In addition to the standard CEM models, we also offer flat rectangular CEMs which can be stacked together to form arrays and which allow simultaneous measurements and read out of several sensors. The metalized contact areas are usually deposited on the narrow under and upper side of the CEMs. The outputs and therefore the anodes for CEMs smaller than 4 mm are positioned off-center. This increases the distance between adjacent anodes and therefore reduces possible crosstalk between the signal lines.
   
   
 
Selection Guide CEM arrays (examples)
 
CEM array model

KBLA210-5 with 5 channels of 2 x 10 mm opening

 
KBLA210-5
KBLA510-5 with 5 channels of 5 x 10 mm opening
 
KBLA510-5
KBLA1505-5 with 5 channels of 5 x 10 mm opening
 
KBLA1505-5
KBLA1010-5 with 5 channels of 10 x 10 mm opening
 
KBLA1010-5
Fig. 1 CEM array model KBLA210-5
 
Fig. 2 Compact Neutral Particle Analyser CNPA-03bbbbbbbbbbbbbbbbbIoffe Institute, St. Petersburg
 
Fig. 3 KBLA_IPP_9 with 9 channels and 3 different openings
 
 
Fig. 4 Concept for a circular CEM array

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replacement of a CEM array for VG CLAM 4 Electron Spectrometer

As a special service we offer the replacement of old glass made CEMs by CEMs Series KBL for
electron spectrometer. This example shows the replacement for a VG CLAM4
     
 
     
Fig. 5 Original CEM array
 
Fig. 6 CEM array after replacement
     
 
     
Fig. 7 Original glass CEMs
 
Fig. 8 Replacement CEMs model KBL 1705
     

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
Replacement of a CEM array for an OMICRON EA125 Energy Analyzer
     
This example shows the replacement of old glass Channeltrons™ for an OMICRON EA125 Energy Analyzer
     
 
     
Fig. 13 Original detector array
 
Fig. 14 Detector array after replacement
     
 
     
Fig. 15 Original glass CEMs
 
Fig. 16 CEM model EA125-7
     
 
     
Fig. 17 Original CEM array
 
Fig. 18 New CEM array
     

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A CEM array for a VG Thermo ESCALAB220 iXL X-ray Spectrometer

This sample shows the replacement of old glass CEMs for a VG Thermo ESCALAB220 iXL X-ray spectrometer by our CEM model KBL1507
     
 
     
Fig. 9 Original CEM array
 
Fig. 10 CEM array after replacement
     
 
     
Fig. 11 Original glass CEMs
 
Fig. 12 New CEMs model KBL1507