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Summary of Contents for Surface Concept DLD4040
- Page 1 Delayline Detector DLD4040 Manual Delayline Detector DLD4040 (Release 2.55 & 3.54) Manual...
- Page 2 Am Sägewerk 23a 55124 Mainz Germany phone: +49 6131 62716 0 fax: +49 6131 62716 29 Delayline Detector DLD4040 Release R2.55 & R3.54 email: info@surface-concept.de web: www.surface-concept.de Manual Version 2.3 Printed on 2020-07-02 DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
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Page 3: Table Of Contents
5.4 Working with the DLD - Important Details ..................23 5.5 MCP Outgassing during Operation ....................24 6 Delayline Detector Layout ..........................25 6.1 Delayline Detector - Vacuum Wiring ....................25 6.2 Delayline Detector - Connection Ports ....................26 DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... - Page 4 8.4 Operation ..............................32 8.5 MCP Lifetime and Operation Voltage ....................32 8.6 MCP Degase Procedure ........................... 36 8.7 Replacement ............................... 36 9 Troubleshooting ..............................37 10 Technical Data ..............................39 11 List of Figure ..............................41 DLD4040 R2.55 & R3.54 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 2.55 & 3.54 of the Delayline Detectors DLD4040. It is divided into 11 chapters. The chapter “Introduction” contains a brief description of the DLD. The chapter “Installation” refers to installation and cabling, while the chapter “Principle of Operation”... -
Page 6: General Overview Of The System
3D(x,y,t) area and time detection of electrons, ions, x-ray and UV-light. The DLD4040 R2.55 is mounted on CF160, the DLD4040 R3.54 on a CF100 vacuum flange with feedthroughs for high voltage supply and signal transfer. It consists of a microchannel plate stack and two layers (x, y) of meander structured delaylines. -
Page 7: Installation
3.1 Initial Inspection Visual inspection of the system is required to ensure that no damage has occurred during shipping. Should there be any signs of damage, please contact SURFACE CONCEPT immediately. Please check the delivery according to the packing list (see Table 1) for completeness. -
Page 8: Detector Orientation
Image 0/0 position Figure 1a: 0/0 position of the DLD R2.55 image (red dot). Image 0/0 position Figure 1b: 0/0 position of the DLD R3.54 image (red dot). DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 9: Cabling And High Voltage
Figure 2a: Connection scheme of the delayline detector R2.55 and readout package. Figure 2b: Connection scheme of the delayline detector R3.54 and readout package. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH Figure 2a: Connection scheme of the delayline detector R2.55 and readout package. - 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.
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Page 11: Software Interface And Installation
Software Installation Manual. Read-out of the delayline detector is done via the USB port of the TDC (time-to-digital-converter). The specific PC system requirements can be found in the corresponding TDC manual. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... - Page 12 DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
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Page 13: Operation Of The Dld
This will wear out the MCPs very fast. Turn off ion pumps and ion gauges before turning on the high voltage of the detector. DLD4040 R2.55 & R3.54 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”...
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Page 15: Dark Count Rate Measurement
Figure 4 homogeneous and sharply bounded. See for an example (your specific DLD image can differ in size, shape and segmentation). Figure 4: Example for DLD image of accumulated dark counts. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 16: Standard Dld Measurement
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. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 17: Operation Of The Detector With The Mcp Front Side Connected To A Reference Voltage17
400V per minute, when operating the detector with an external high voltage applied to “MCP-F” for the first time. Otherwise turn up the high voltage carefully and stepwise within a couple of minutes to the operation voltage. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... - Page 18 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 Figure 5: Schematic sketch on voltage ramping with external reference voltage. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
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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 (e.g. the meander detector) may still be too hot for safe operation. It is imperative that all users be informed of this issue and take the necessary precaution to ensure proper device operation. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
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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. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 22: Basic Operational Modes Of The Delayline Detector
= Amplifier-CFD-Unit or AU = Amplifier-Unit). The main function of the CFD is digital pulse discrimination, ideally without any time-walk even at varying pulse heights. A time-to-digital converter (TDC) behind these chains serves as stop-watch for arrival time measurements. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 23: Working With The Dld - Important Details
DLD occur. Figure 7: Example of a partial overload (left) and a heavy (global) overload (right). DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 24: 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 DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 25: Delayline Detector Layout
6 Delayline Detector Layout 6.1 Delayline Detector - Vacuum Wiring The delayline detector DLD4040 R2.55 and R3.54 consist of a detection area, defined by the detector cover, the MCP holders and the detector anode. The detector anode consists of two meander structured delaylines (named x and y), which are placed above each other (electrically isolated) and are oriented perpendicular to each other. -
Page 26: Delayline Detector - Connection Ports
U_DLD MCP-B Figure 10: Connection ports of the DLD4040 R2.55 (left) and the DLD4040 R3.54 (right). The naming of the SHV connections are engraved directly on the CF40 flange. The internal high voltage connection for the delayline detector is given schematically in Figure 11. - Page 27 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. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
- Page 28 DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
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Page 29: Pulse Processing Electronics
Hold the ACU straight and plug it very carefully. The middle pins of the SMB connectors in the 4-fold SMB feedthrough can be damaged when holding the ACU not straight while plugging. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 30: Positions Of The Discriminator Threshold Regulators
Changing the adjustment can easily end up with a status, where a readjustment must be made by Surface Concept. Figure 13: Labeling of discriminator threshold and amplification regulators. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 31: Micro Channel Plate (Mcp)
Voltages must not be applied to the device while at atmospheric pressure. The pressure should be 1E-6mbar or lower at the micro channel plate before applying voltage. Otherwise, damaging ion feedback or electrical breakdown will occur. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 32: Operation
Figure 14 The typical gain degradation of a MCP is shown in as a function of extracted output charge in terms of coulombs per square centimeter. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... - Page 33 This voltage is given in the specification sheet of each detector. A typical behavior of the detector voltage increase over time to compensate gain degradation is given Figure schematically in DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
- Page 34 • 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 35 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 DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
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Page 36: Mcp Degase 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. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... -
Page 37: Troubleshooting
Delayline Detector DLD4040 Manual 9 Troubleshooting Consult the Hints_and_TroubleShootingDLDs Manual (part of the detector delivery) in case of any problems prior to contacting your provider. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... - Page 38 DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
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Page 39: Technical Data
No. of Amplifier-CFD Channels: Bandwidth of DLD amplifiers: 1.6 GHz CFD working frequency: 200 MHz CFD jitter (max.): 20ps CFD walk (typ.): < 50ps (while ambient temperature varies less then 5 K) DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH... - Page 40 DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
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Page 41: List Of Figure
Figure 9: Schematic orientation and naming of delaylines and DLD image....................25 Figure 10: Connection ports of the DLD4040 R2.55 (left) and the DLD4040 R3.54 (right)................. 26 Figure 11: Internal connection of high voltage potentials (schematic)......................27 Figure 12: Layout of ACU 3.4.2. - Page 42 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. DLD4040 R2.55 & R3.54 Manual | Surface Concept GmbH...
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