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Delayline Detector DLD6060-8S Manual | Surface Concept GmbH

6 Delayline Detector Layout ............................................................................................................................24
6.1 Delayline Detector - Vacuum Wiring .................................................................................................24
6.2 Delayline Detector - Connection Ports .............................................................................................25
7 Pulse Processing Electronics ........................................................................................................................27
7.1 Pulse Processing Electronics ACU 5.16.1 ..........................................................................................27

7.1.1 Positions of the Discriminator Threshold Regulators ......................................................28

8 Microchannel Plate .........................................................................................................................................29
8.1 Specifications .............................................................................................................................................29
8.2 Storage .........................................................................................................................................................29
8.3 Handling ......................................................................................................................................................29
8.4 Operation ....................................................................................................................................................30
8.5 MCP Lifetime and Operation Voltage ...............................................................................................30
8.6 MCP Degase Procedure ..........................................................................................................................33
8.7 Replacement ..............................................................................................................................................33
9 Troubleshooting ................................................................................................................................................34
10 Technical Data..................................................................................................................................................35
11 List of Figure .....................................................................................................................................................36

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Summary of Contents for DLD6060-8S

Page 1: ...Delayline Detector DLD6060 8S Release 1 10 Manual...

Page 2: ...y 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 Surfa...

Page 3: ...10 3 2 4 Recommended System Requirements 13 4 Operation of the DLD 14 4 1 Getting Started 14 4 1 1 Start Up Procedure 14 4 1 2 Dark Count Rate Measurement 16 4 1 3 Standard DLD Measurement 16 4 2 Stan...

Page 4: ...Processing Electronics 27 7 1 Pulse Processing Electronics ACU 5 16 1 27 7 1 1 Positions of the Discriminator Threshold Regulators 28 8 Microchannel Plate 29 8 1 Specifications 29 8 2 Storage 29 8 3...

Page 5: ...5 Delayline Detector DLD6060 8S Manual Delayline Detector DLD6060 8S Manual Surface Concept GmbH...

Page 6: ...uctions Please read this manual carefully before performing any electrical or electronic operations Please also consult the SURFACE CONCEPT Safety Instructions and the manual of the PHOIBOS Hemispheri...

Page 7: ...e Delayline Detector can be used without any physical modification to the analyzer plug and play TheDLD6060 8Sconsistsofachevronmicrochannelplatestackanddifferentlayersof segmentedmeander structured d...

Page 8: ...heDelaylineDetectormustbestoredforlateruse Replacement will be done by shipping the detector MCPs within this container It can also be used to store the detector when not installed in a vacuum chamber...

Page 9: ...he transportation locks When looking into the opened detector flange of the spectrometer from the bottom side you can locate the alignment hole for the detector Align the pin in the cover of the Delay...

Page 10: ...he two DLD images 0 and 45 system The 0 0 position of the 0 corresponds to the upper left corner of the image in the software Figure 3 0 0 position of the DLD image red dot for the a 0 system and b 45...

Page 11: ...D6060 8S Manual Delayline Detector DLD6060 8S Manual Surface Concept GmbH a b Figure 4 Connection scheme of a the Delayline Detector to the PHOIBOS Analyzer and the SPECS Power Supply b the DLD6060 8S...

Page 12: ...ed to zero before connecting the high voltage cables to the detector otherwise serious damage to the detector can occur due to high voltage sparks Connect the output of your high voltage power supply...

Page 13: ...responding software manual for detailed information on the software package and the DLL interface The delivery package of the Delayline Detector includes a CD ROM with hardware drivers and the GUI sof...

Page 14: ...details see your end user software manual Be sure that the vacuum pressure at the detector is remarkably below 1E 6mbar otherwise the microchannel plates might be damaged by a local discharging in gen...

Page 15: ...ach the operation voltage without sparking Figure 5 Schematic sketch on voltage ramping during Start Up procedure See the SPECS Analyzer manual for ramping of the Herzog Potential Note The detector st...

Page 16: ...uld always be set to 0V Therefore the CH B voltage is only defined by the Herzog Potential which must be ramped first see SPECS Analyzer manual for details The CH HV voltage is given in respect to the...

Page 17: ...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 4 2 Standard Operation Procedure Not...

Page 18: ...h channel plates will lose gain and exhibit a markedly higher detector plateau Even if the detector housing feels just warm any internal parts seated on insulators e g the detector anode may still be...

Page 19: ...MCP stack where it induces electrical pulses into the delayline by capacitive coupling The pulses are traveling to the both ends of the meander within a time determined by the hitting position Each hi...

Page 20: ...onstant which depends on cable lengths electronics propagation times experimental setup etc Therefore it is possible to completely determine position and time of each event from only 4 precise time me...

Page 21: ...induced pulses on the delayline which have to reach a certain amplitude to be detected by the electronics independent on the intensity of the electron source e g mercury lamp On the other hand if the...

Page 22: ...nt decrease of the count rate and happens either due to overloads or due to the normal behavior in the burn in phase In such a case a new detector operation voltage should be determined by making a de...

Page 23: ...the load of the MCPs The increase can easily reach more than one decade starting from the 10E 10mbar range for new MCPs being operated with a load of a couple of million counts per second The effect...

Page 24: ...s defined by the pin in the cover of the detector The second set of delaylines is rotated counterclockwise by 45 in respect to the first set of delaylines providing a 45 rotated image in respect to th...

Page 25: ...and the X1 and X2 and Y1 and Y2 respectively for the two signal lines for the specific delayline Therefore the signal naming is N1X1 N1X2 N1Y1 N1Y2 N2X1 N2X2 N2Y1 N2Y2 R1X1 R1X2 R1Y1 R1Y2 R2X1 R2X2 R...

Page 26: ...d be unlimited The CH B voltage is put together by the Herzog Potential of the analyzer a Bias voltage U_Bias The CH HV voltage is always given and measured in respect to the CH B voltage and U_DLD is...

Page 27: ...power supply for the complete detector This also depends on the layout of the detector as well as the pulse processing electronics 7 1 Pulse Processing Electronics ACU 5 16 1 The ACU 5 16 1 contains t...

Page 28: ...its best performance to the starting operation voltage of the detector when delivered A new adjustment should not be needed The starting operation voltage is given in the specification sheet The oper...

Page 29: ...d be protected from exposure to particle contamination Particles which become affixed to the plate can be removed by using a very pure and low pressure air flow such as from a clean rubber bellows The...

Page 30: ...posure 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 degradation MCPs can degas...

Page 31: ...ing residual gas molecules from the inside of the channels the MCP performance is very stable over a large amount of extracted output charge The MCP gain is also a function of the detector operation v...

Page 32: ...dicates the beginning of the area of operation The new value for the operation voltage should be a bit above the position of the change in the slope Figure 18 shows an example of an MCP curve with the...

Page 33: ...tor response which is the main reason for a shortened operation time of the MCPs 8 6 MCP Degase Procedure The effect of MCP outgasing can be reduced by running a degas procedure To do so the detector...

Page 34: ...line Detector DLD6060 8S Manual Surface Concept GmbH 9 Troubleshooting Consult the Hints_and_TroubleShootingDLDs Manual part of the detector delivery in case of any problems prior to contacting your p...

Page 35: ...art of delivery not available 150 C 1E 6mbar 1 6GHz 200MHz 20ps 50ps whileambienttemperaturevarieslessthen5K DelaylineDetectorGeneral HVCapabilityforfloatingbasevoltage Activearea Operation voltage at...

Page 36: ...Example of a a partial overload and b a heavy global overload 22 Figure 9 Example of a an overvoltage on the MCPs and b an undervoltage at high count rates 22 Figure 10 Schematic orientation and namin...

Page 37: ...he above named products comply with the following European directive 89 336 EEC Electromagnetic Compability Directive amended by 91 263 EEC and 92 31 EEC and 93 68 EEC 73 23 EEC Low Voltage Equipment...

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