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1-Channel MCP Detector MCPD40 Manual | Surface Concept GmbH

Surface Concept GmbH

Am Sägewerk 23a

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+49 6131 62716 29

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1-Channel MCP Detector

MCPD40 Release 006

Manual Version 2.1

Printed on 2019-08-16

Summary of Contents for MCPD40

Page 1: ...1 Channel MCP Detector MCPD40 1 Channel MCP Detector MCPD40 Release 006 Manual...

Page 2: ...z 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...

Page 3: ...3 2 2 Cabling and High Voltage 7 4 Operation of the MCPD40 8 4 1 Getting Started 8 4 1 1 Start Up Procedure 8 4 1 2 Dark Count Rate Measurement 9 4 1 3 Standard Detector Measurement 9 4 2 Standard Op...

Page 4: ...rs technical details about the microchannel plates and the MCP detector 2 2 Safety Instructions Please read this manual carefully before performing any electrical or electronic operations Strictly fol...

Page 5: ...Surface Concept MCPD40 R006 is a 1 Channel MCP Detector It consist of a chevron microchannel plate stack and a detector anode MCP pulses are capacitively coupled into the anode The anode is a 50Ohm m...

Page 6: ...ollows to install it into your vacuum chamber Vent the package carefully Unpack the detector carefully Before installing the detector to your chamber check the front side of the MCP stack for particle...

Page 7: ...006 The detector holds two SHV connectors labeled MCP B and MCP F for the high voltage supply and one BNC connector labeled SIG for the signal output MCP B connects the high voltage part of the detect...

Page 8: ...s before turning on the high voltage of the detector Turnonthehighvoltagecarefully Thevoltageincreaseshouldnotexceed400Vperminute Aschematic sketch on how to ramp the voltages during the Start Up proc...

Page 9: ...voltage from 0 V to a target voltage of exemplary 1600V 4 1 2 Dark Count Rate Measurement Check the detector output by means of any electronics and software or with an oscilloscope where the input is...

Page 10: ...re carefully every time the high voltage is turned on Switch off the high voltage immediately in case of a temporary pressure rise by an order of magnitude or more This indicates high voltage sparking...

Page 11: ...er is used to isolate the high voltage from the ground potential within a sandwich layer system of the detector anode Figure 3 Layout of the HV connections and photos of the single detector elements T...

Page 12: ...ith an additional filterbox for the signal output to minimize noise effects on the signal line which comes from external sources Connect the filterbox with the short cable to the BNC feedthrough of th...

Page 13: ...f the wafer The MCP should be handled by its rims there is no solid glass border Use clean degassed tools fabricated from stainless steel Teflon or other ultra high vacuum compatible materials Handlin...

Page 14: ...be degraded by exposure to various types of hydrocarbon materials which raise the work function of the surface causing gain degradation Operation at higher temperatures 50 C will cause gain degradati...

Page 15: ...rease the operation voltage from time to time Voltage increase should always be made in small steps typically 50V There is a recommended maximum operation voltage to which the detector voltage can be...

Page 16: ...e Use an appropriate device to measure the count rate output of the detector Decrease the operation voltage until the count rate of the detector is reduced to zero Increase the operation voltage in st...

Page 17: ...d operation time of the MCPs 6 6 MCP Degase Procedure The effect of MCP outgasing can be reduced by running a degas procedure To do so the detector must be operated at a high count rates for a time pe...

Page 18: ...ut temperature Vacuum pressure range for operation MCPD40 R006 40 mm 10 counts per sec See Specification Sheet for detail 2 SHV connectors MCP front detector anode MCP back 1 BNC connector 50Ohm match...

Page 19: ...Internal connection of the high voltage potentials schematic for the R006 11 Figure 5 Filterbox 12 Figure 6 Typical gain degradation of MCPs as function of the extracted output charge 14 Figure 7 Sch...

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