Related Manuals for Surface Concept MCPD25
Summary of Contents for Surface Concept MCPD25
- Page 1 1-Channel MCP Detector MCPD25 Manual 1-Channel MCP Detector MCPD25 (Release 009 & 012) Manual...
- Page 2 55124 Mainz Germany phone: +49 6131 62716 0 1-Channel MCP Detector MCPD25 fax: +49 6131 62716 29 Release R009 & R012 email: info@surface-concept.de Manual Version 2.0 web: www.surface-concept.de Printed on 2020-10-22 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH...
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Page 3: Table Of Contents
6.4 Operation .......................... 18 6.5 MCP Lifetime and Operation Voltage ..............18 6.6 MCP Degas Procedure ....................22 6.7 Replacement........................22 7 Technical Data ......................... 23 8 List of Figure ..........................25 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH... - Page 4 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH...
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Page 5: Introduction
This manual is intended to assist users in the installation, operation and maintenance of Release Version 009 & 012 of the 1-channel MCP detector MCPD25. It is divided into 8 chapters. The chapter “Introduction” contains a brief description of the Detector. -
Page 6: General Overview Of The System
UV-light. 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 with feedthroughs for high voltage supply and signal transfer. It consist of a chevron microchannel plate stack and a single metal anode. -
Page 7: Installation
1-Channel MCP Detector MCPD25 Manual 3 Installation 3.1 Initial Inspection Visual inspection of the MCPD25 is required to ensure that no damage has occurred during shipping. Should there be any signs of damage, please contact your provider immediately. Please check the delivery Table 1) for completeness. -
Page 8: Cabling And High Voltage
Be sure that all voltages are settled to zero before connecting the high voltage cables to the detector, otherwise serious damage to the detector can occur due to high voltage sparks. 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH... -
Page 9: Operation Of The Mcpd
• Watch the vacuum pressure while increasing the high voltage; turn the voltages back, if an unusual increase is observed in the pressure (indicator for high voltage sparking). 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH... - Page 10 The voltage for “MCP-B” is always given in reference to the MCP front voltage “MCP-F”. Note Example: Assume the following operation voltage for “MCP-B”: +1800V. “MCP-F” is terminated to GROUND. Use a ramp time of approx. 5min. to increase “MCP-B” to +1800V. 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH...
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Page 11: Dark Count Rate Measurement
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. 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH... -
Page 12: Operation Of The Detector With The Mcp Front Side Connected To A Reference Voltage
Observe the chamber pressure 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. 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH... - Page 13 “MCP-B” to +1,800V. Then a ramp time of approx. 3 min. should be used to increase the external reference voltage from 0V to +1,000V in parallel with the “MCP-B” voltage from +1,800V to +1,900V. 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH...
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Page 14: Bake Out Procedure
An exception is the use of a floating HV Supply, where the “MCP-F” is supplied to the MCPD as well as to a specific reference input of the HV Supply. In this case, the output voltage for “MCP-B” in increased automatically with applying the reference voltage for “MCP-F”. Surface Concept provides special HV Supplies with floating capability for such purposes. -
Page 15: Mcp Detector Layout
5.1 MCP Detector - Vacuum Wiring The MCP detector MCPD25 consist of a detection area, defined by the MCP holders and the detector anode. The front side of the detector anode is on high voltage potential, while the signal readout is realized close to ground potential (in respect to the high voltage of the MCPs). - Page 16 10 – 60MΩ (the exact value is given in the specification sheet of the detector). The resistance between “MCP-F” and “SIG” and“MCP-B” and “SIG” Note should be unlimited. 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH...
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Page 17: Microchannel Plate
• The MCP should be mounted only in fixtures designed for this purpose. Careful note should be taken of electrical potentials involved. 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH... -
Page 18: Operation
Figure 6 The typical gain degradation of a MCP is shown in as a function of extracted output charge in terms of coulombs per square centimetre. 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH... - Page 19 This voltage is given in the specification sheet of each detector. A typical behaviour of the detector voltage increase over time to compensate gain degradation is given Figure schematically in 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH...
- Page 20 • Start the detector operation with a homogeneous illumination (as good as possible). • Open the rate meter in the Surface Concept GUI Software to monitor the count rate output of the detector. • Decrease the operation voltage until the count rate of the detector is reduced to zero.
- Page 21 Strong inhomogeneous irradiation of the MCPs lead to strong locally different gain degradation and to an inhomogeneous detector response, which is the main reason for a shortened operation time of the MCPs. Note 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH...
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Page 22: Mcp Degas Procedure
(depending on number of MCPs in the detector). All parts of the detector, especially the MCPs should be handled with great care. The MCP surfaces are very sensitive and should never be touched or scratched. 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH... -
Page 23: Technical Data
Potential of Detector Cover: connected to MCP-F potential Grid voltage: not available Signal Feedthrough: 1x BNC Feedthrough HV Feedthrough: 2x SHV5 Bake-out temperature (max.): 150°C Vacuum pressure range for operation: < 1E-6mbar 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH... - Page 24 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH...
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Page 25: List Of Figure
Figure 7: Schematic plot of increasing the operation voltage to compensate gain degradation over time as function of the extracted charge (all values are only exemplary)................20 Figure 8: Example of MCP curve (for illustration only)....................21 1-Channel MCP Detector MCPD25 Manual | Surface Concept GmbH...
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