MA-900 Hall effect magnetic lens power supply
Contents
1. els fa ho myn Co c Co e T m a 0 10 0 150 0 150 b o elll Tin Se k na ho A a ho e wa o on colo F M o Co in b OUTPUT IM FE DANCE VOLTAGE MODE SERES R SERES ut 30uQ 1uH 12640 uH 1uH 600uQ 1uH 24H CET Tuo 0 84 30 0 Su 0 51 63uQ 0 5y 22 0 Su 0 8 iuH uH uH uH 22mQ 24H fo eggs 2 Bs BIB BIE D b o Wei BIB Shia S Y b b o b otk b gt ri G a r r ti r ri xixiririx CURRENT M ODE M 4 125 6 we sl R ecl X Ex mimim m B i 6 i Mf an j m 8 8 8 A RE xz amp 8 nimimimimi m m So f En i 6 amp g i 100 o 5 b Ww B fo m 6 B B gla Colo BIBIS e sig Sleg a 40u 440uUF E A b M C mo as FULL RACK JOE 690M JQE 16 50M JQE 25 40lvl JQE 36 30M JQE 65 20M JQE 75 15M F Co c ev fa Co gt j o T nm no a 0 75 ae on o 4A o 0 15 Sue 0 Spl 05 DET Tuh iuh o we p SI fk E 8I ee 17 6kuF 12kp 5 14kp 6k 11 kp 5 7 3kpl 4 2ku i a _ ho 6 n es n Bak 1 For deter mining dynamic impedance in voltage mode 2 For determining dynamic impecance in current mede Microanalytical Researc h Centre 15 7 16 6 21 0 19 0 18 0 18 0 17 0 18 0 10 MA 900 Hall effect magnetic lens power supply 19 4822. 6 t 24 572 Lu 14377 o 1 29 ke al CLN 181 463 6 12443 952 t 15 7s 8 FRONT VIEW 3 48 i5 To Rack Mount use 6 14 20 x Ss Thread Cutting Screws into Plastic Inserts ait S typ Remove Feet Removable BOTTOM VIEW 105 261 2 23 6 170 7 SIDE VIEW 11 Microanalytical Research Centre MA 900 Hall effect magnetic lens power supply JQE MECHANICAL SPECIFICATIONS input connector oup Wass No 1 veal 0 ore Mounting penal Microanalytical Research Centre 12
3. 00 Hall effect stabilisation unit The rear of the MA 900 unit is shown in Fig 5 Fieure 5 The rear current connections for the MA 900 unit From left to right the connections from the rear are 240 VAC input channel 2 control signal Channel 1 control signal Channel 2 high current connections Channel 1 high current connections The MA 900 contains a precision two channel Hall effect transducer clamped on the high current supply cable The Hall effect transducer is temperature compensated and provides a precision feedback signal that does not require the use of a current sensing series resistor Microanalytical Research Centre 4 MA 900 Hall effect magnetic lens power supply The unit is to be connected up as in Fig 6 From tests in the MARC laboratory no noticeable drift in the beam spot size above 1 micrometre occurs over time spans of 24 hours Out 1 MARCO MA 900 rear Kepco JQE Unit 1 rear Figure 6 Wiring diagram for channel one channel 2 is similar Note the 7 5 k resistor and the links on the control block of the Kepco JQE unit 2 Principle of operation The current leads from the Kepco units pass through the core of an internal Hall effect current transducer that measures the current and provides a voltage feedback signal This is compared to an internal reference controlled by the handpiece to generate a programming voltage to the Kepco units The Hall effect current transducer is a LOHET2 unit wh
4. JQE GENERAL SPECIFICATIONS SPECIFICATION CONDITION INPUT a o Voltage User selectable Current Max load 115V a c Frequenoy 47 65Hz Range OUTPUT d o Output Transistor Type of stabilizer Current limited Voltage Oto 10095 of rating Adjustment range Current for temp 0 71 C Leakage curent Output to ground Parallel Use current mode limiting sonnedien Current sharing Use master slave connection Redumdancy type External steering diodes ONP Not available CONTROL Type Voltage Fixed input variable gain uH Current Differential comparison Voltage Local 10 turn precision rheostat Remote analog 1000 ohms per volt or Oto imA control current Remote digital Use SN SNHR interface 12 bit Listen only Curent lem Wahumpi 7 oOo Remote analog Not provided See Series ATE models Dynamics See tabulated value of C Normal slow dv dt I C in the model table Fast mode Not provided See Series ATE models Microanalytical Research Centre MA 900 Hall effect magnetic lens power supply JQE MODEL TABLE MODE L QUARTER RACK JOE amp 10M JOE 15 6M JQE 25 4M JOE 36 3 JQE 55 2M JQE 75 1 5M JOE 1001M HALF RACK JOE amp 22M JOE amp 45M JQE 15 12M JQE 15 25M JQE 25 10M JQE 25 20M JOE 36 8M JQE 36 15 JQE 65 5 JQE 55 10lvl JQE 75 3M JQE 75 8M JOE 100 2 5M JOE 1005M JOE 150 1 5 JOE 1503 5 Zie c o o wo i on ro N 2 e e e pE M c T Wa z ho on e
5. MA 900 Hall effect magnetic lens power supply User s Manual ommercial Organisation Microanalytical Research Centre School of Physics University of Melbourne VICTORIA 3010 AUSTRALIA Fax 61 0 3 9347 4783 Ph 61 0 3 8344 5376 Email marc physics unimelb edu au Web http www ph unimelb edu au marco February 2002 MA 900 Hall effect magnetic lens power supply Preface This manual contains a user s guide to the MA 900 magnetic lens power supply For further technical assistance please contact MARC via the following email address marc support physics unimelb edu au Limitation of Liability Micro Analytical Research Centre does not assume any liability arising out of the use of the information contained within this manual This document may contain or reference information and products protected by copyrights or patents and does not convey any license under the patent rights of Micro Analytical Research Centre nor the rights of others Micro Analytical Research Centre will not be liable for any defect in hardware or software or loss or inadequacy of data of any kind or for any direct indirect incidental or consequential damages in connections with or arising out of the performance or use of any of its products The foregoing limitation of liability shall be equally applicable to any service provided by Micro Analytical Research Centre Note No part of this publication may be reproduced stored in a retriev
6. al system or transmitted in any form or by any means electronic mechanical photocopying or otherwise without the prior written permission of MARC Manual Version 1 0 Manual Date February 2002 2002 Microanalytical Research Centre Microanalytical Research Centre MA 900 Hall effect magnetic lens power supply Table of Contents 1 INTRODUCTION 2 PRINCIPLE OF OPERATION eeeeeee estes neta tanen enata tosta enata nones ta ton sns ato tones esas nens tanen enne teens 3 INSTALLATION AND OPERATING INSTRUCTIONS eeeeeeeeeeeeee enean enn tn ta ton enin a ee nen tun 4 SPECIFICATIONS 4 1 GENERAD oneer e A RE E R N E GE EN EARE AROA GOND DA DINA H I EEEE EEA EEEE is APPENDIX 1 JOE GENERAL SPECIFICATIONS csssssssssssssssssssssssesessssesessssesesssssssssssessesssesscsesessees Microanalytical Research Centre MA 900 Hall effect magnetic lens power supply 1 Introduction Magnetic lenses in a nuclear microprobe system need a convenient to use high stability lens power supply The MA 900 Hall effect unit is designed for magnetic lenses that operate at currents from 10 to 90 Amperes The MA 900 magnetic lens power supply was developed to control the magnetic lenses of the Melbourne nuclear microprobe system that employs a Russian antisymmetric quadruplet of MARCO type 4 or type 5 magnetic quadrupole lenses MARCO type 2 magnetic lenses typically requi
7. hat steps 3 and 4 be followed in the correct order to ensure safe operation 3 Switch off the Kepco units 4 Switch off the MA 900 unit Microanalytical Research Centre 7 MA 900 Hall effect magnetic lens power supply 4 Specifications 4 1 General The MA 900 magnetic lens power supply is designed to operate with a MARCO nuclear microprobe system with type 2 lenses The probe forming lens system consists of an MP2 Russian antisymmetric magnetic lens system or a high excitation quintuplet system of type 4 lenses The MA 900 power supply parameters are e Two independent channels of power supply output e Output 0 90A continuously adjustable by the coarse and fine control controls on the hand piece at 0 6V e Stability After the warm up time will maintain 1m focus on any lens system with excitation aberration coefficients less than 260um mrad 9 4 2 Kepco JQE Units The power supply parameters are independent of the MA 900 stabilisation unit e 10 turn voltage control for exceptional resolution e Analog output control by resistance 1000W Volt or by a voltage delivering 0 1mA e Digital listen only control using SN series digital interfaces e Current limited front panel control not programmable 10926 10596 lo max e JQE can control current with an external current sense resistor Microanalytical Research Centre MA 900 Hall effect magnetic lens power supply Appendix 1 JQE General Specifications
8. ich is temperature compensated with an offset stability of 0 02 C and a gain stability of 0 02 C The LOHET2 is installed in a ferrite core transformer where it operates in the range of 400 to 400 Gauss to produce a voltage output of 5 mV Gauss The zero current setting of the MA 900 may be adjusted by trim pot R5 see Fig 7 for the location of this trim pot on the feed back circuit boards The procedure for this is as follows 1 Connect the MA 900 unit to the lens system as described in the previous section 2 With the mains power off and the cable disconnected remove the top cover of the MA 900 unit 3 Setthe controls on the hand controller to zero CAUTION Potentially hazardous voltages are present inside the MA 900 unit when powered Observe all necessary precautions Qualified service personnel only should perform the next steps Microanalytical Research Centre 5 MA 900 Hall effect magnetic lens power supply 5 Power on all units 6 With an appropriate screwdriver adjust R5 until the output current reads zero on the front panel digital displays 7 Power off all units and reassemble Zero offset adjust trip pot set controls on hand piece to zero before adjustment Figure 7 The circuit board of one channel of the MA 900 Hall effect stabilisation unit showing the location of the R5 trimpot Microanalytical Research Centre 6 MA 900 Hall effect magnetic lens power supply 3 Installati
9. on and operating instructions Please observe all normal precautions for electrical equipment and lifting heavy apparatus in addition to the instructions here when installing the MA 900 unit These instructions should be read in conjunction with the separate manuals for the Kepco JQE units themselves CAUTION Ensure the correct mains voltage has been selected on each unit before connection to the mains To install and power up the system the following procedure must be followed 1 Ensure all power switches on all units are off Mount the Kepco units in suitable 19 rack together with the MA 900 stabilisation unit Connect all units into the mains 2 Connect the Kepco units to the MA 900 stabilisation unit and connect the loads as shown in figure 3 Be sure to observe the polarity of the lenses 3 Plug the handpiece into the MA 900 Hall effect unit 4 Ensure the potentiometers on the hand piece are set to zero 5 Turn the current limit control on the Kepco units to maximum operation 6 Power on the MA 900 Hall effect unit 7 Power on the Kepco units 8 Adjust the controls on the hand piece to set the desired current in the lenses 9 Allow the system to warm up for 30 minutes and re adjust as necessary To power off the system 1 Make a note of the settings of the controls of the hand piece and the currents in each channel for future reference 2 Turn the controls on the hand piece to zero CAUTION It is essential t
10. re currents of up to 90 A at voltages up to 6 V and long term stability The MA 900 magnetic lens power supply consists of the following components e MARCO Hall effect lens stabilisation unit and hand controller e 2x Kepco JQE 0 6V 0 90A C173 power supply units e Interconnection cables Hand controller Hall effect unit Power cables Figure 1 The major components of the MA 900 system The layout of the major components in relation to the magnetic lens system of the nuclear microprobe is shown below in Fig 2 MA 900 control unit Hand Controller JQE 0 6V 0 90A C173 JQE 0 6V 0 90A C173 v Supply 1 to lenses Supply 2 to lenses Figure 2 Layout of major system components Fine line represents control cable heavy line represents power cable Microanalytical Research Centre 3 MA 900 Hall effect magnetic lens power supply The hand controller Fig 3 incorporates coarse and fine current controls for both channels When not in use following fine focusing of the lens system it should be stowed in a safe place to prevent mechanical disturbance which may cause the lenses to drift out of focus Figure 3 The MA 900 hand controller The MA 900 unit itself is shown in Fig 4 From left to right the items are current in channel 1 Amperes current in channel 2 Amperes socket for hand controller and mains on off switch with pilot light Act LENS CONTROLLER Figure 4 The MA 9
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