Kentech Instruments Pockels cell Driver Manuale utente

Kentech Instruments Ltd.,

Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K.

Tel: +44 (0) 1491 82 1601

E-mail [email protected]

Web http://www.kentech.co.uk/

Kentech Instruments Ltd.

Pockels cell Driver for ASE suppression

Instructions For Use

Serial Numbers ....

27-10-2014

PLEASE READ THIS MANUAL CAREFULLY

BEFORE USING THE DRIVERS OR POCKELS CELLS

Kentech Instruments Ltd.,

Page 2 Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. 27-10-2014

Contents

1 DISCLAIMER 4

2 ABBREVIATIONS 4

3 INTRODUCTION 4

3.1 SPECIFICATIONS OF THE PACKAGE....................................................................................................... 4

4 OVERALL DESCRIPTION 5

4.1 MECHANICS ................................................................................................................................................. 5

4.2 ELECTRICAL CONNECTIONS ................................................................................................................... 5

4.3 RUNNING THE ELECTRONICS ................................................................................................................. 5

4.4 POWERING UP ............................................................................................................................................. 5

4.5 LEDS............................................................................................................................................................... 7

5 INSTALLATION AND SAFETY 7

5.1 POWER INLET .............................................................................................................................................. 7

5.2 FUSE............................................................................................................................................................... 7

5.3 SIGNAGE ....................................................................................................................................................... 9

6 GENERAL DESCRIPTION OF SYSTEM 10

6.1 TRIGGER AND CONTROL MODULE ...................................................................................................... 10

6.2 THE OPTICAL DETECTOR WITH AMPLIFIER ...................................................................................... 10

6.3 HIGH VOLTAGE PULSE MODULE .......................................................................................................... 10

6.4 THERMISTOR POSITION.......................................................................................................................... 10

6.5 MAINTENANCE ......................................................................................................................................... 10

6.6 JITTER.......................................................................................................................................................... 11

7 USING THE SYSTEM 11

7.1 INTRODUCTION ........................................................................................................................................ 11

7.2 POCKELS CELL.......................................................................................................................................... 12

8 SOFTWARE INTERFACE 13

8.1 CAUTIONS .................................................................................................................................................. 13

8.2 INTRODUCTION ........................................................................................................................................ 13

8.3 CONFIGURING THE ETHERNET LINK .................................................................................................. 13

8.3.1 USING DEVICE INSTALLER .................................................................................................................... 14

8.4 TYPICAL OPERATION............................................................................................................................... 19

8.5 THE ENABLE LOGIC................................................................................................................................. 20

8.6 THE PULSER............................................................................................................................................... 20

8.7 TRIGGER ..................................................................................................................................................... 20

8.8 LEDS............................................................................................................................................................. 20

8.9 PROTOCOL.................................................................................................................................................. 20

8.9.1 MULTIPLE COMMANDS ON ONE LINE ................................................................................................ 21

8.10 CONTROL COMMANDS ........................................................................................................................... 21

8.10.1 PULSE AMPLITUDE .................................................................................................................................. 21

8.10.2 PULSER TRIGGERING .............................................................................................................................. 22

8.10.3 LOAD ........................................................................................................................................................... 22

8.10.4 ENABLE....................................................................................................................................................... 22

8.10.5 PERSONALITY ........................................................................................................................................... 23

8.10.6 TEMPERATURE.......................................................................................................................................... 23

8.10.7 MODE SELECT ........................................................................................................................................... 23

8.10.8 STATUS ........................................................................................................................................................ 23

8.10.9 CONTROL.................................................................................................................................................... 24

8.10.10 MACHINE STATE ....................................................................................................................................... 24

8.11 STATE OF UNIT AT DELIVERY................................................................................................................ 25

8.12 DEBUG MODE ............................................................................................................................................ 25

8.13 MODES......................................................................................................................................................... 25

8.14 SAVING THE MACHINE STATE............................................................................................................... 26

8.15 DEBUG MODE COMMANDS ................................................................................................................... 26

8.16 TEST WAVEFORMS ELECTRICAL .......................................................................................................... 28

8.16.1 ELECTRICAL TESTS OF UNIT J1405141-1 ............................................................................................. 28

8.17 TEST WAVEFORMS OPTICAL.................................................................................................................. 37

8.17.1 OPTICAL TESTS OF UNIT J1405141-1..................................................................................................... 37

8.18 TESTS ON THE PHOTODIODE................................................................................................................. 42

9 REPORTS 42

9.1 OPTICAL TESTING REPORT .................................................................................................................... 42

9.2 RADIAL PROBING MEASUREMENTS ................................................................................................... 49

10 POCKELS CELL SETUP AND ALIGNMENT 50

Kentech Instruments Ltd.,

Page 3 Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. 27-10-2014

Figure Captions

Figure 1 Overall picture of unit..................................................................................................................... 6

Figure 2 Front and rear panels showing signage........................................................................................... 8

Figure 3 Signs used on the equipment, see Figure 2 on page 8.....................................................................9

Figure 5 Electrical pulse shape....................................................................................................................29

Figure 6 Electrical pulse shape - the rising edge......................................................................................... 30

Figure 7 Timing jitter with electrical triggering of unit J1405141-2, .........................................................31

Figure 8 Monitor output for unit J1405141-2. ............................................................................................32

Figure 9 Monitor output for unit J1405141-2. ............................................................................................33

Figure 10 Relative optical transmission. .......................................................................................................34

Figure 11 Relative optical transmission. Top detail from Figure 8 on page 34 . ..........................................35

Figure 12 Relative optical transmission rising edge detail from Figure 8 on page 34 .................................36

Figure 13 Relative optical transmission. .......................................................................................................37

Figure 14 Relative optical transmission top detail from Figure 11 on page 37.............................................38

Figure 15 Relative optical transmission rising edge detail from Figure 11 on page 37................................39

Figure 16 Relative amplitude of the best impulse from a bre optic (FO) modulator.................................. 40

Figure 17 Relative amplitude of the best step from a bre optic (FO) modulator driven by a .....................41

Figure 18 The rising edge at various radial positions....................................................................................50

Figure 19 The rising edge at various radial positions with normalised amplitude........................................51

Figure 20 Plot showing the relative timing and signal amplitude as a function of radial position ...............52

Kentech Instruments Ltd.,

Page 4 Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. 27-10-2014

1 DISCLAIMER

This equipment contains high voltage power supplies. Although the current supply capacity is

small, careless use could result in electric shock. It is assumed that this highly specialised equipment

will only be used by qualied personnel.

Kentech Instruments Ltd. accepts no responsibility for any electric shock or injury arising from

use or misuse of this equipment. It is the responsibility of the user to exercise care and common sense

with this highly versatile equipment.

2 ABBREVIATIONS

ADC Analogue to Digital Converter

ASE Amplied Stimulated Emission

dv desired value

EEPROM Electrically programmable and erasable Read only memory, non-volatile

EM Electro Magnetic

EPLD Electrically programmable logic device

hw hardware

mv measured value

SD standard deviation

sw software

UCS Users Control System (to be provided by the user)

3 INTRODUCTION

This manual describes the operation and use of an electronics package initially designed to drive

a single crystal KD*P pockels cell for the purposes of ASE suppression at 1053nm. This package is

fully computer controlled via an Ethernet link. The package will deliver pulsed voltages to a load which

will normally be a through terminated pockels cell with the output of the cell going back to the driver

for termination and monitoring.

3.1 SPECIFICATIONS OF THE PACKAGE

Number of channels 1

Output pulse voltage nominally +7kV but can be reduced to nominally ~5kV.

Output pulse duration nominally 5ns xed.

Trigger delay ~30ns with electrical triggering.

Power requirements 90 to 240 volts A.C. 50 to 60Hz, at ~10 watts.

Dimensions 19 inch rack mount, 3U high by 400mm deep.

Pulser monitor 1000:1 with slightly reduced bandwidth.

Maximum repetition rate 12Hz.

Kentech Instruments Ltd.,

Page 5 Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. 27-10-2014

Electrical trigger requirements 2 volts into 50Ω rising in < 5ns Excessive trigger input

on the gate will increase the trigger delay.

The pulser may also be triggered optically.

Wavelength 820 to 900 nm

Optical power (on) -15dBm (min), +3dBm (max)

Optical Power (off) -30dBm (max)

Width (50% level) 10ns (min), 250ns (max)

Rise time <2ns

Maximum duty 0.1%

Connectors:-

Power:

Connector IEC inlet

Power consumption Maximum average power <15 watts

Fuse 3.15 Amps Type T

Voltage 100 to 240 ~ VAC

Frequency 50 to 60Hz

Pulse output Modied N type.

Pulse return and termination Modied N type.

Pulse monitor SMA

Trigger BNC

Opto trigger Fibre optic ST jack.

4 OVERALL DESCRIPTION

4.1 MECHANICS

The unit is a 19 inch rack enclosure. 3U high and 400mm deep. Power inlet is at the rear, power

switch ann all other connections on the front panel. An enable Nlll2SG-6-105 switch is also available

on the front panel.

4.2 ELECTRICAL CONNECTIONS

Power to the rear panel, trigger, output and return on the front panel, monitor on the front panel.

4.3 RUNNING THE ELECTRONICS

The electronics is only rated for use near sea level. Use at altitude may compromise the voltage

hold off in the high voltage compartment.

The unit is tted with two fans at the rear. It is advisable to run these if the unit runs hot. If necessary

they can be slowed or stopped, under these circumstances the temperature of the unit should be observed.

Once the user is condent on the level of air ow needed to maintain the temperature, the monitoring

of the temperature can be less rigorous.

4.4 POWERING UP

The unit has three modes of operation plus a “debug” mode. The state into which the unit powers

up is set by these modes and the storage of a previous state of the unit.

Kentech Instruments Ltd.,

Page 6 Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K 27-10-2014.

Figure 1 Overall picture of unit

Kentech Instruments Ltd.,

Page 7 Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. 27-10-2014

The pockels cell (the load) can be damaged by excessive voltage. Although the unit cannot produce

more than 7kV into a 50 ohm load it will produce up to twice this into an open circuit, although for a

short time. If the cable from the cell to the terminator has a round trip time less than the pulse length,

there is a risk of a high voltage at the cell. Even with shorter cables, if there is no termination load then

high voltages an appear on the pockels cell.

To protect the cell we recommend setting the unit to start in a mode where it cannot be enabled

if the load has a high impedance. There is provision for this, see section “8.13 MODES” on page 25.

4.5 LEDS

The front panel LEDs indicate the statuses of various components:

1 power

2 triggered

3 ready

4 enabled

5 pulser fault

6 load high

7 load low

The unit may be enabled if the ready light is lit. The ready light will be on if the load is correct and

there is no pulser fault. However, by setting ags the ready light can also be on if these conditions are

not met. This is discussed in section “8.13 MODES” on page 25. This enables the unit to be used under

fault conditions. Generally it is unadvisable to run the unit with a pockels cell in the load lead if the

load high LED is illuminated. See section “4.5 LEDs” on page 7.

5 INSTALLATION AND SAFETY

5.1 POWER INLET

Power is supplied via the IEC inlet on the rear panel. For use in the USA the power cord should

use a UL listed cable and meet UL approvals, e.g. Part 12645-4 from TruConnect and be rated at 125V

AC ~ at 10 amps.

For use in the UK the approval should be BS1363/A and the rating should be 250VAC ~ at 5

amps and the fuse tted to the plug should not be greater than 5 amps. For other countries please ask

the factory.

The rear panel connector must be readily accessible to permit mains power isolation by way of

removing the power lead.

5.2 FUSE

There are no user servicable components within the enclosure. Any servicing should be done by

the manufacturer. Should the fuse fail we recomend that it be replaced no more than once and that the

type indicated in the specications is used. If it should fail a second time return the unit to the factory.

Kentech Instruments Ltd.,

Page 8 Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K 27-10-2014.

Serial No. J1405141

Use earthed supply.

Hazardous voltage inside.

Lockout power before servicing.

J/B FT

PAT Date

Universal input

85-250V AC

Fuse type T

rating 3.15Amps

Internal thermal trip

100-240V ~ 50-60Hz

Maximum average

power 15 watts

Fuse rating 3.15 Amps, type T

Internal thermal trip

Triggered

Proportional monitor

(~1,000:1 into 50Ω)Pulse return

(7kVpulsed)

Kentech Instruments Ltd.

Made in England by

www.kentech.co.uk

Pockels cell driver

Power

Ethernet

Pulse output

(7kVpulsed)

Opto Trigger Disable

Enable

Trigger input

(2V, 50Ω)

Load

high

Ready Pulser

fault

Enabled Load

low

Figure 2 Front and rear panels showing signage

Kentech Instruments Ltd.,

Page 9 Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. 27-10-2014

5.3 SIGNAGE

The folowing signs are used on the equipment.

100-240V ~ 50-60Hz

Maximum average

power 15 watts

Fuse rating 3.15 Amps, type T

Internal thermal trip

Use earthed supply.

Hazardous voltage inside.

Lockout power before servicing.

Figure 3 Signs used on the equipment, see Figure 2 on page 8

ΩOmega = ohms

Range of acceptable power supply

and

UL standards approval

Warning label indicating how the unit

should be used or serviced.

Hazardous voltages at the indicated

connector. Do not touch.

Kentech Instruments Ltd.,

Page 10 Isis Building, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, U.K. 27-10-2014

6 GENERAL DESCRIPTION OF SYSTEM

The unit has several modules, a trigger and control module, an optical detector with amplier, a

high voltage pulse module and a terminator module.

6.1 TRIGGER AND CONTROL MODULE

This comprises a trigger circuit with inputs for both optical and electrical triggering, a trigger

amplier that delivers a 40 volt pulse to the high voltage pulse module, 3 high voltage power supplies

and an embedded controller. The embedded controller is enclosed within a steel screened box to help

stop EM interference form the pulser affecting the computer. On this card, which is situated in the

top half of the enclosure, are also two potentiometers that set the trigger thresholds, one for electrical

triggering and one for optical. These have been set up for 2 volt triggering on the electrical input and

at an optical level as used by other equipment made by Kentech. The module delivers high voltage

power to the pulser module and DC power to the opto trigger module.

6.2 THE OPTICAL DETECTOR WITH AMPLIFIER

This is located on the front panel and is integral with the front panel optical input connector. The

unit is powered by the trigger and control module and delivers an electrical signal of up to 1 volt to

the trigger input circuit.

6.3 HIGH VOLTAGE PULSE MODULE

This module is in the lower half of the enclosure and is built into a screen box. Running the pulser

with this box open risks causing the processor to crash.

The pulser is of a design unique to Kentech Instruments Ltd. It comprises many avalanche transistors

delivering a single output that is shaped to give an optimum optical signal when used with a suitable

pockels cell.

The voltages at 15 points around the pulser are measured and can be read back with the software

to check that the pulser has no faults. This is done automatically at power up but may also be done at

any other time in “Debug” mode.

Asmall DC voltage is applied to the output and the current drawn measured. This is used to measure

the load impedance. This is done automatically at power up but may also be done at any other time in

“Debug” mode.

6.4 THERMISTOR POSITION

The thermistor is located inside the high voltage pulser unit.

6.5 MAINTENANCE

The unit should require little maintenance. The only possible exception is lubrication of the N

type output connectors if they are repeatedly mated and unmated. It is essential that the insulators on

these connectors are kept clean. Failure to lubricate the threads of the N type connectors combined

with repeated reconnection of the output connectors can lead to small metal particles being deposited

on the connector insulators. This could lead to breakdown of the connectors.

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