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1-Channel MCP Detector MCPD25 Manual

1-Channel MCP Detector

MCPD25

(Release 009 & 012)

Manual

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Summary of Contents for MCPD25

Page 1: ...1 Channel MCP Detector MCPD25 Manual 1 Channel MCP Detector MCPD25 Release 009 012 Manual...

Page 2: ...Germany phone 49 6131 62716 0 fax 49 6131 62716 29 email info surface concept de web www surface concept de All rights reserved No part of this manual may be reproduced without the prior permission of...

Page 3: ...tart Up Procedure 9 4 1 2 Dark Count Rate Measurement 11 4 1 3 Standard Detector Measurement 11 4 2 Standard Operation Procedure 11 4 2 1 Operation with MCP Front Side terminated to GROUND 11 4 2 2 Op...

Page 4: ...4 1 Channel MCP Detector MCPD25 Manual Surface Concept GmbH T h i s s i d e h a s b e e n l e f t b l a n k o n p u r p o s e...

Page 5: ...ntain amongst others technical details about the microchannel plates and the MCP detector in general 2 2 Safety Instructions Please read this manual carefully before performing any electrical or elect...

Page 6: ...ght It is a non imaging device but it can be used with the appropriate readout electronics for time resolved measurements The MCPD25 R009 is mounted on a CF100 the MCPD25 R012 on a CF160 vacuum flange...

Page 7: ...e package carefully and slowly use N2 for venting if possible Remove the transport container carefully Before installing the detector to your chamber check the front side of the MCP stack for particle...

Page 8: ...ia a single 50Ohm matched BNC feedthrough named SIG The naming can be found again directly engraved on the flange Be sure that all voltages are settled to zero before connecting the high voltage cable...

Page 9: ...nd ion gauges before turning on the high voltage of the detector Turn on the high voltage carefully The voltage increase should not exceed 400V per minute A schematic sketch on how to ramp the voltage...

Page 10: ...e MCP B to 1800V High voltage sparks may seriously damage the detector anode or the MCPs Observe the chamber pressure carefully every time the high voltage is turned on Switch off the high voltage imm...

Page 11: ...e vacuum pressure at the detector is remarkably below 1E 6mbar otherwise the microchannel plates might be damaged by a local discharging in general the lower the pressure the longer the lifetime of th...

Page 12: ...s Turn off all sources for electrons ions light or X rays that might hit the detector Increase the detector voltage for MCP B to the specified operation voltage stepwise within a couple of minutes The...

Page 13: ...and call your provider for further assistance if is it not possible to reach the operation voltage without sparking The detector operation voltage MCP B is given in the specification sheet It is alwa...

Page 14: ...C Do not exceed this temperature Note Windows and feedthroughs should be wrapped with aluminium foil to protect them from rapid temperature changes The use of heating tapes and jackets is not recommen...

Page 15: ...age of the MCPs A pulse coupling layer is used to isolate the detector anode from the high voltage of the MCP stack as well as to couple pulses from the electron cloud into the metal anode Figure 4 La...

Page 16: ...CP F resistance of MCP stack and the internal resistor should be in the range of 10 60M the exact value is given in the specification sheet of the detector The resistance between MCP F and SIG and MCP...

Page 17: ...an room compatible vinyl gloves when handling MCPs No physical object should come into contact with the active area of the wafer The MCP should be handled by its rims there is no solid glass border Us...

Page 18: ...raise the work function of the surface causing gain degradation Operation at higher temperatures 50 C will cause gain degradation MCPs may degas for quite a while during operation The pressure increas...

Page 19: ...erywillstillhappenwiththeMCPsoperatingwithintheburn inperiod althoughthedetector has been operated for some longer time with highest count rates during the test phase Therefore gain degradationwillbes...

Page 20: ...ce of high voltage sparking The operation voltage can be increased even above the recommended maximum operation voltage A safe and reliable operation will still be possible as long as there is no incr...

Page 21: ...h stability of the operation performance over a large amount of extracted output charges after the burn in period The main reason for an often much shorter operation time of the MCPs is an inhomogeneo...

Page 22: ...Then switch to the final application The pressure increase for the smaller count rate should now be much smaller The detector will be delivered already pre conditioned Unfortunately the degas procedur...

Page 23: ...Operation voltage at detector Voltage at MCP front Potential of Detector Cover Grid voltage Signal Feedthrough HV Feedthrough Bake out temperature max Vacuum pressure range for operation MCP Detector...

Page 24: ...24 1 Channel MCP Detector MCPD25 Manual Surface Concept GmbH T h i s s i d e h a s b e e n l e f t b l a n k o n p u r p o s e...

Page 25: ...he HV and signal connections 15 Figure 5 Internal connection of the high voltage potentials schematic 16 Figure 6 Typical gain degradation of MCPs as function of the extracted output charge 19 Figure...

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