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Surface Concept DLD8080-4Q Manual

Delayline detector
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Delayline Detector
DLD8080-4Q
(Release 4.00)
Manual

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Summary of Contents for Surface Concept DLD8080-4Q

  • Page 1 Delayline Detector DLD8080-4Q (Release 4.00) Manual...
  • Page 2 Am Sägewerk 23a 55124 Mainz Germany Manual for the Delayline Detector DLD8080-4Q phone: +49 6131 62716 0 Release 4.00 fax: +49 6131 62716 29 Manual Version 2.1 email: info@surface-concept.de Printed on 2020-06-30 web: www.surface-concept.de Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 3: Table Of Contents

    5.2 Basic Operation Modes of the Delayline Detector ...............22 5.2.1 2D Area Detection ........................22 5.2.2 Time Resolved Imaging ......................22 5.2.3 Specialities of the 4Q and 8S Detector Anode ..............22 5.3 Data Acquisition ............................23 Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 4 8.3 Handling ..............................35 8.4 Operation ..............................36 8.5 MCP Lifetime and Operation Voltage ....................36 8.6 MCP Degate Procedure ..........................40 8.7 Replacement ..............................40 9 Troubleshooting ...............................41 10 Technical Data ..............................43 11 List of Figure ..............................45 Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 5: Introduction

    This manual is intended to assist users in the installation, operation and maintenance of Release 4.00 of the Delayline Detector DLD8080-4Q. It is divided into 11 chapters. The chapter “Introduction” contains a brief description of the DLD. The chapter “Introduction” contains a brief description of the DLD. The chapter “Installation”...

  • Page 6: General Overview Of The System

    (4Q and 8S) detector systems. The DLD8080-4Q R3.00 is a 4-quadrant detector system. It is mounted on a CF 160 vacuum flange with feedthroughs for high voltage supply and signal transfer. It consists of a microchannel plate stack and two layers (x, y) of a 4-fold meander structured delayline.

  • Page 7: Installation

    4x DLD Readout Cable (HDMI) with Strain Relief • Storage Medium with Documentation and Software Table 1: Packing list for the DLD8080-4Q Detector. 3.2 Installation 3.2.1 Mounting the Delayline Detector The detector is transported under vacuum. Proceed as follows, to install it into your vacuum chamber: Vent the transport container carefully and slowly (use N2 for venting if possible).

  • Page 8: Detector Orientation

    0/0 position of the DLD image which corresponds to the upper left corner of the image in the software. Image 0/0 position Figure 1: 0/0 positions of the DLD images (red dots). Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 9: Cabling And High Voltage

    “MCP-F” is the contact to the front side of the MCP stack, “MCP-B” is the contact to the back side of the MCP stack and “U_DLD” is connected to the detector anode. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 10 • In case that a Surface Concept HV Supply is part of the delivery, the MCP-F potential is connected to the external reference input“HV Ref. In” of the HVPS. In this case the SHV termination plug is used to terminate the external reference input.

  • Page 11: Recommended System Requirements

    Read-out of the delayline detector is done via the USB or Ethernet port of the TDC (see the TDC manual for specific connection scheme). The specific PC system requirements can be found in the corresponding TDC manual. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 12 Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 13: Operation Of The Dld

    • 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). Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 14 The detector starting operation voltage for “MCP-B” is given in the specification sheet. The voltage for “U_DLD” is fixed to “MCP-B” + 400V, when using the Surface Concept HV Power Supply. It cannot be changed by the user and is therefore always increasing/ decreasing together with the voltage for “MCP-B”...

  • Page 15: Dark Count Rate Measurement

    Keep in mind the description about the important operation details in Chapter Note Turn off the high voltage, close the software and turn off the TDC before performing any changes of the cabling. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 16: Standard Operation Procedure

    (the use of the rate meter is recommended). • Now you may start carefully with an electron source observing the detector output. Keep in mind the description about the important operation details in Chapter Note Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 17: Operation With 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. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 18 “MCP-F” is also given in the specification sheet. Note The Surface Concept HV Power Supply is a floating HV device. The reference voltage must not explicitly be added to the operation voltage. See the manual of the HV Power Supply for further information.

  • Page 19: Bake Out Procedure

    “MCP-B” to +1,900V. Then a ramp time of approx. 3 min. should be used to increase the external reference voltage from 0V to +1,000V. Now the actual output voltage of the Surface Concept HV Power Supply in reference to the GND potential would be for “MCP-B”: +2,900V (1,900V + 1,000V) and for “U_ DLD”: +3,300V (“MCP-B”...
  • Page 20 It is imperative that all users be informed of this issue and take the necessary precaution to ensure proper device operation. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 21: Dld - Principle Of Operation

    The exact value depends on the individual DLD layout (e.g. the size of the active area) and is given within the specification sheet of the DLD. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 22: Basic Operation Modes Of The Delayline Detector

    This results in a splitting up of the inner area between two quadrants; into an area of increased intensity and into an area with no intensity. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 23: Data Acquisition

    2D images (with or without time stamps) by the histogram module of the data acquisition DLL. Data processing and presentation on the PC is realized by the end-user software (see the corresponding software manuals for detailed information on the software package). Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 24: Working With The Dld - Important Details

    Figure 8: Example of a partial overload (left) and a heavy (global) overload (right). It is easy to mistake an overload for no signal at all. To distinguish between these two, check the pressure. A pressure increase indicates an overload. Note Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 25: Mcp Outgassing During Operation

    The degas procedure must be repeated to Chapter some extend after each venting. For further information on the degas procedure for MCPs see Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 26 Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 27: Delayline Detector Layout

    6 Delayline Detector Layout 6.1 Delayline Detector - Vacuum Wiring The delayline detector DLD8080-4Q consists of a detection area, defined by the detector cover, the MCP holders and the detector anode. The detector anode is separated into four independent quadrants (no. 1 - 4), each consisting of two meander structured delaylines, which are placed above each other (electrically isolated) and are orientated perpendicular to each other.

  • Page 28: Delayline Detector - Connection Ports

    CF40 flange. The internal high voltage connection for the delayline detector is given schematically in X2 Y2 U_DLD MCP-B MCP-F Figure 11: Connection ports for the DLD8080-4Q. Figure 12: Internal connection of high voltage potentials (schematic). Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 29 8 – 30 MΩ (the exact value is given in the specification sheet of your detector), while the resistance between “MCP-B” and “U_DLD” and “MCP-F” and “U_DLD” respectively should be unlimited. This can be used to verify the position of the “U_DLD” Note voltage connector. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 30 Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 31: Pulse Processing Electronics

    3. Clip for fastening ACU to detector flange 4. Connection sockets for DLD readout cables with M3 thread to fasten the strain relief of the readout cables Figure 13: Layout of ACU 5.16.1. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 32: Positions Of The Discriminator Threshold Regulators

    Do not change the adjustment of the thresholds and/or zero offsets. Changing the adjustment can easily end up with a status, where a readjustment must be made by Surface Concept. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 33 Delayline Detector DLD8080-4Q Manual Amplification Regulator Fraction Regulator CFD Threshold Zero Offset Regulator Figure 14: Labelling of discriminator threshold and amplification regulators. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 34 Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 35: Microchannel Plate

    Voltages must not be applied to the device while at atmospheric pressure. The pressure should be 1E-6mbar or lower at the microchannel plate before applying voltage. Otherwise, damaging ion feedback or electrical breakdown will occur. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 36: Operation

    Figure 15 The typical gain degradation of a MCP is shown in as a function of extracted output charge in terms of coulombs per square centimetre. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 37 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 schematically in Figure Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 38 • 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 39 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 Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 40: Mcp Degate 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. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 41: Troubleshooting

    Delayline Detector DLD8080-4Q Manual 9 Troubleshooting Consult the Hints_and_TroubleShootingDLDs Manual (part of the detector delivery) in case of any problems prior to contacting your provider. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 42 Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 43: Technical Data

    Amplifier CFD - Unit ACU 3.4.2 No. of Amplifier-CFD Channels: Bandwidth of DLD amplifiers: 1.6GHz CFD working frequency: 200MHz CFD jitter (max.): 20ps CFD walk (typ.): < 50ps (while ambient temperature varies less then 5 K) Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...
  • Page 44 Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

  • Page 45: List Of Figure

    Figure 9: Example of an over voltage on the MCPs (left) and an under voltage at high count rates (right)........25 Figure 10: Schematic orientation and naming of quadrants, delaylines and DLD image................27 Figure 11: Connection ports for the DLD8080-4Q..............................28 Figure 12: Internal connection of high voltage potentials (schematic) ......................28 Figure 13: Layout of ACU 5.16.1 .......................................

  • Page 46: Ec Declaration Of Conformity

    (Dr. Andreas Oelsner) This declaration does not represent a commitment to features or capabilities of the instrument. The safety notes and regulations given in the product related documentation must be observed at all times. Delayline Detector DLD8080-4Q Manual | Surface Concept GmbH...

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