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Kentech Instruments SIMCART Instruction Manual

Pulse generator system
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Kentech Instruments Ltd.
Instruction Manual
for
SIMCART pulse generator system
Serial Numbers SNJ9607291
28th. January 1997
PLEASE READ THIS MANUAL CAREFULLY
BEFORE USING THE PULSE GENERATOR
Kentech Instruments Ltd.,
Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K.
International tel: (44) 1235 510 748 International fax: (44) 1235 510 722
email info@kentech.co.uk
Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England.
28th. January 1997
1

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Summary of Contents for Kentech Instruments SIMCART

  • Page 1 Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, U.K. International tel: (44) 1235 510 748 International fax: (44) 1235 510 722 email info@kentech.co.uk Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...
  • Page 2 Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 3: Table Of Contents

    POWERING UP THE HEAD RECOMMENDED RATINGS 6.4.1 VACUUM 6.4.2 PHOSPHOR VOLTAGE 6.4.3 MCP BIAS 6.4.4 PHOTO CONDUCTIVE DETECTOR TRIGGER TIMING POSSIBLE FAULTS OUTPUT PULSE SHAPES Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 4: Introduction

    MCP some of these will be accelerated into the MCP and generally hit the sides of the holes in the * Step size is nominally 100ps, the channel to channel differences are small. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...
  • Page 5 Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 6: Care And Environmental Considerations

    FAST GATING METHOD The X–rays which are incident on the MCP produce photoelectrons. With a voltage across the MCP some of these will be accelerated into the MCP and generally hit the sides of the holes in the plate where they will multiply as they cascade down through the MCP. At the output they are then accelerated onto the phosphor screen producing light which may be recorded on film.

  • Page 7: General Electrical Layout

    GENERAL ELECTRICAL LAYOUT The electronics consists of several modules, namely:- Pulse generator pulse forming modules delay unit bias unit power supply Note that the numbers refer to figure 1. A schematic of the circuit is shown in below Output decoupling in MCP Diamond housing 18 ohm 4x...

  • Page 8: The Power Supply

    We recommend about 15 volts be used, up to 2.5 amps may be required. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 9: Using The Power Supplies

    -1kV to +500 V. This output used to be available for biasing but this has been Connections to the main psu. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 10: Connections To The Power Supplies

    2 on blue output 6 on output 3 on green output 5 on brown output 4 on Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...
  • Page 11 The pulser bulkhead showing trigger input, HTs, and trigger loop throughs, DC inputs and outputs, to access the on board regulator, and the main pulse outputs. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 12: The Pulse Generator

    If the unit is under test, then individual pulse output cards can be made inoperative by removing the trigger lead. Ideally the trigger lead should then be shorted out to prevent large voltages appearing across the connector. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...
  • Page 13 If transistors are triggered inadvertently, in this manner they will fail. If there are any suspected problems with the pulse cards they should be returned to us. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 14: Pulse Shaping Modules

    However, repetitive breaking down will eventually damage the insulators and should be avoided. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 15: The Delay Unit

    (7,F) and this will be about 400mA in total at 12 volts. (Note that the high voltage power supply takes about 1.6A. This means that the total dissipation of the system can be 24 watts. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 16: Bias Control Section

    SMB connectors are used for the trigger signals between the modules. More of these are available from Kentech Instruments should they not be available locally. It is important that the risetime not be degraded significantly beyond about 500ps or jitter may be introduced.

  • Page 17: Dc Bias Blocks

    When refitting the holder make sure it is up the correct way and that the pressure plate is in the ‘jacked off’ position. Also ensure that the film is fairly taught as this will stop jamming problems. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 18: Power Up Checks And Procedure

    If the user keeps well below them they should have no problems. 6.4.1 VACUUM Better than 5 10 torr for 30 minutes Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 19: Phosphor Voltage

    Check to see if the MCP is bowed, if so see section 1.3. (ii) Breakdown of EHT feed. No DC image Insensitive MCP. Replace Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...
  • Page 20 (iv) Some other radiation e.g. neutrons or hard x-rays are exciting the phosphor directly. Remove source of radiation or improve screening. Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997 Fogged film...
  • Page 21 -0.5 -0.5 Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...

  • Page 22: Output Pulse Shapes

    OUTPUT PULSE SHAPES Channel 1 100ps -0.4 -0.2 Channel 2 100ps -0.4 -0.2 Channel 3 100ps -0.4 -0.2 Channel 4 100ps -0.4 -0.2 Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...
  • Page 23 Channel 1 200ps -0.5 Channel 2 200ps -0.5 Channel 3 200ps -0.5 Channel 4 200ps -0.5 Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...
  • Page 24 Channel 1 500ps -0.5 Channel 2 500ps -0.5 Channel 3 500ps -0.5 Channel 4 500ps -0.5 Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...
  • Page 25 Channel 1 1ns Channel 2 1ns Channel 3 1ns Channel 4 1ns Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...
  • Page 26 Channel 1 2ns Channel 2 2ns Channel 3 2ns Channel 4 2ns Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...
  • Page 27 Channel 1 Unformed Pulse Channel 1 Unformed Pulse -0.2 Kentech Instruments Ltd., Unit 9, Hall Farm Workshops, South Moreton, Didcot, Oxon, OX11 9AG, England. 28th. January 1997...