Surface Concept Delayline DLD 8080 Manuel utilisateur

DLD8080 R4.30 & R4.31 Manual

Delayline Detector

DLD8080

(Release 4.30 & 4.31)

Manual

2DLD8080 R4.30 & R4.31 Manual | Surface Concept GmbH

Surface Concept GmbH

Am Sägewerk 23a

55124 Mainz

Germany

phone: +49 6131 62716 0

fax: +49 6131 62716 29

email: info@surface-concept.de

web: www.surface-concept.de

be reproduced without the prior permission

of Surface Concept GmbH.

Delayline Detector DLD8080

Release: R4.30 & R4.31

Manual Version 2.2

Printed on 2019-08-16

DLD8080 R4.30 & R4.31 Manual

1 Table of Contents

1 Table of Contents ................................................................................................................................................3

2 Introduction..........................................................................................................................................................6

2.1 General Information....................................................................................................................................6

2.2 Safety Instructions .......................................................................................................................................6

2.3 General Overview of the System............................................................................................................ 7

3 Installation............................................................................................................................................................. 8

3.1 Initial Inspection............................................................................................................................................... 8

3.2 Installation .......................................................................................................................................................... 8

3.2.1 Mounting of the Delayline Detector..........................................................................................8

3.2.2 Detector Orientation.......................................................................................................................9

3.2.3 Cabling and High Voltage..............................................................................................................9

3.2.4 Software Interface and Installation......................................................................................... 11

4 Operation of the DLD......................................................................................................................................12

4.1 “Start Up“ Procedure for First Time Operation.................................................................................12

4.1.1 “Start Up“ Procedure..................................................................................................................... 12

4.1.2 Dark Count Rate Measurement................................................................................................ 14

4.1.3 Standard DLD Operation ............................................................................................................ 14

4.2 Standard Operation Procedure.............................................................................................................15

4.2.1 Operation with MCP Front Side terminated to GROUND ............................................... 15

4.2.2 Operation of the Detector with the MCP Front Side connected to a Reference Voltage16

4.3 Bake Out Procedure.................................................................................................................................. 18

5 DLD - Principle of Operation.........................................................................................................................19

5.1 Basics of Delayline Detection................................................................................................................ 19

5.2 Basic Operational Modes of the Delayline Detector .................................................................... 20

5.2.1 2D(x, y) Area Detection................................................................................................................ 20

5.2.2 3D(x, y, t) Time Resolved Imaging............................................................................................ 20

5.3 Data Acquisition ........................................................................................................................................ 21

5.4 Working with the DLD - Important Details ...................................................................................... 21

5.5 MCP Outgassing during Operation .................................................................................................... 23

DLD8080 R4.30 & R4.31 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.........................................................................................................................26

7.1 Pulse Processing Electronics ACU 3.4.2............................................................................................. 26

7.1.1 Positions of the Discriminator Threshold Regulators ....................................................... 27

8 Micro Channel Plate (MCP)............................................................................................................................28

8.1 Specications.............................................................................................................................................. 28

8.2 Storage.......................................................................................................................................................... 28

8.3 Handling....................................................................................................................................................... 28

8.4 Operation..................................................................................................................................................... 29

8.5 MCP Lifetime and Operation Voltage ................................................................................................ 29

8.6 MCP Degase Procedure........................................................................................................................... 32

8.7 Replacement............................................................................................................................................... 32

9 Troubleshooting................................................................................................................................................33

10 Technical Data .................................................................................................................................................34

11 List of Figure.....................................................................................................................................................35

DLD8080 R4.30 & R4.31 Manual | Surface Concept GmbH

DLD8080 R4.30 & R4.31 Manual

DLD8080 R4.30 & R4.31 Manual | Surface Concept GmbH

2 Introduction

2.1 General Information

This manual is intended to assist users in the installation, operation and maintenance of Release Version

4.30 & 4.31 of the Delayline Detectors DLD8080. 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” explains the theory of operation of the DLD. 3 chapters describe

the technical details of the detector readout package and chapter “Operation of the DLD” describes the

operation of the DLD. The nal chapters contain among others technical details about the microchannel

plates and the Delayline Detector in general.

2.2 Safety Instructions

Pleasereadthismanualcarefullybeforeperforminganyelectrical or electronicoperations

and strictly follow the safety rules given within this manual.

The following symbols appear throughout the manual:

Note

The“note symbol”marks text passages, which contain important information/hints about

the operation of the detector. Follow these information to ensure a proper functioning

of the detector.

The “caution symbol” marks warnings, which are given to prevent an accidentally

damaging of the detector or the readout system. Do NOT ignore these warnings and

follow them strictly. Otherwise no guarantee is given for arose damages.

The “high voltage symbol” marks warnings, given in conjunction with the description of

the operation/use of high voltage supplies and/ or high voltage conducting parts.

Hazardous voltages are present, which can cause serious or fatal injuries. Therefore

only persons with the appropriate training are allowed to carry out the installation,

adjustment and repair work.

DLD8080 R4.30 & R4.31 Manual | Surface Concept GmbH

DLD8080 R4.30 & R4.31 Manual

2.3 General Overview of the System

The Surface Concept Delayline Detectors are particularly developed for the needs of 1D(x), 2D(x,t), 2D(x,y)

or 3D(x,y,t) area and time detection of electrons, ions, x-ray and UV-light.

The DLD8080 R4.30 & R4.31 are mounted on a CF160 vacuum ange with feedthroughs for high voltage

supply and signal transfer. They consist of a microchannel plate stack and two layers (x, y) of meander

structured delaylines. The image is sampled by the DLD readout electronics.

The 3D (x, y, t) detection bases on the measurement of time dierences and time sums of signals, with a

high temporal resolution in one device. The count rate can reach several MHz in the commonly used 4-fold

coincidence measurement.

Typical applications are:

• imaging of parallel incident particle beams, particularly electrons

• spatially resolved time of ight spectroscopy in 2D/time resolved mode

• time referenced imaging of electrons excited by repetitive driven sources

and in energy analyzers:

• Fermi surface mapping, band mapping, photoelectron diraction measurements, and similar angular

dispersion experiments in 2D mode

• XPS, UPS, ESCA and AES in virtual channel mode

• Stroboscopic experiments in 2D/time resolved mode

DLD8080 R4.30 & R4.31 Manual | Surface Concept GmbH

3 Installation

3.1 Initial Inspection

3.2 Installation

3.2.1 Mounting the Delayline Detector

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 your provider immediately. Please check the delivery

according to the packing list (see Table 1) for completeness.

• Delayline Detector Unit (delivered in a vacuum container)

• Pulse Processing Unit ACU

• 1 x SHV Termination Plug

• 1 x DLD Readout Cable (HDMI) with Strain Relief

• CD with Documentation and Software

Table 1: Packing list for the DLD8080 R4.30 & R4.31 Detector.

The detector is transported under vacuum. Proceed as follows, to install the detector into your vacuum

chamber:

• Vent the transport container carefully and slowly (use N2 for venting if possible).

• Remove the transport container carefully.

• Before installing the detector to your chamber, check the front side of the MCP stack for particles.

The microchannel plates in front of the detector should be protected from exposure

to particle contamination. Particles that stick to the plate can be removed by carefully

using a single-hair brush carefully and/or with dry nitrogen. Reading the instructions

“microchannel plates” in Chapter 8 is strongly recommended.

• Install the detector into your vacuum chamber.

DLD8080 R4.30 & R4.31 Manual | Surface Concept GmbH

DLD8080 R4.30 & R4.31 Manual

• Keep the transport container in case that the detector must be sent back for repair. It can also be

used for storing the detector temporarily (not longer than one month) when not installed in a vacuum

chamber.

Note

The detector should be kept under vacuum all the time.

The best long term storage environment is an oil free vacuum in the 10E-2mbar range or

better.

The transport container is not designed for a long term storage of the detector. A storage

time of one month should not be exceeded.

The transport housing should be evacuated regularly with a period of at least one month,

in case that the transport housing must be used for a longer storage time.

3.2.2 Detector Orientation

The black dot in Figure 1 marks the 0/0 position of the DLD image which corresponds to the upper left

corner of the image in the GUI software.

Figure 1: 0/0 position of the DLD image (black dot).

Image 0/0 position

3.2.3 Cabling and High Voltage

• The general connection scheme of the Delayline Detector including its readout package is shown in

Figure 2.

DLD8080 R4.30 & R4.31 Manual | Surface Concept GmbH

Figure 2: Connection scheme of the Delayline Detector and readout package.

• The pulse processing unit ACU can be connected directly to the DLD 4-fold SMB feedthrough. The

metal pin gives the orientation. Fasten the ACU with the two clips on the housing.

• Use the DLD readout cable to connect the “Lines Out” socket on the front of the ACU with the “TDC

Input” socket at the rear panel of the TDC (see the TDC manual for the specic connection scheme of

the TDC).

• The CF160 base ange holds 1 CF40 ange with 3 SHV feedthroughs for the high voltage supply of the

detector named “MCP-F” , “MCP-B” and “U_DLD”. The naming can be found directly engraved on the

CF40 ange.“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.

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.

• Use the SHV cables to connect the corresponding outputs of the high voltage power supply (“MCP-F”,

“MCP-B”, and “U_DLD”) to the corresponding feedthroughs of the detector.

DLD8080 R4.30 & R4.31 Manual | Surface Concept GmbH

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