Omicron NG LEED Product manual

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--~~- I
INSTRUMENTS FOR SURFACE SCIENCE
M3152
~-"""--'--"'D ~ ~
~~)/~~~
._..._.._- ~
including LIAC and MUL
ldsteiner Straf?,e 78, D-65232 Taunusstein, Germany
Tel.: [phone], Fax: [phone]

Preface 2 NG LEED (S) Technical Reference Manual
Copyright
The information in this document is subject to change without notice and does not repre·
sent a commitment on the part of OMICRON Vakuumphysik GmbH. No liability shall be
accepted for any damages resulting from the use ofthis documentation and the related
product.
Please note: . Some components described in this manual may
be optional. The delivery volume depends on the ordered
configuration.
No part of
th is manual may be reproduced or trans tted i any form r by ny eans
electronic or mechanical, including photocopying
an reco ding, for a itho t
the express written permissi
on of OMICRON Vakuu phy ik G bH .
Product names mentioned herein may
be trademark
their respective companies.
Please
note : This documentation is available in English only.
Attention: Please read the safety information on pages 9 and 10
before using the instrument.
Related Manuals
i;~~!
•"
-:: .... ~,;,
SPECTALEED Optics /
•" SPECTALEED Channelplate
,;.::' 'li"
SPA-LEED
•;::-:
AES using SPECTALEED
Table 1 Related manuals.
February 1998 Versi
on 1.2

Preface 3 NG LEED (S) Technical Reference Manual
Contents
List of Figures .. . .. ... ... .. . .. ..... .. .. .... .. ... . .. .. .. ........................ .. ..... ... ... .. .... .. .. ........... 4
List
of Tables................................................ ... ................................................ .. ....... 4
1. Introduction ................................................................................................................. 6
General Description ... ............................................................................ .. ...... .. ........ 6
NORMAL USE..... .............. ... ..... ........ . ........ . ...... .. ............................. ............... ..... ....... 6
Technical Specification.. ... .. ............ .. .. ..... .. .......................................... ... .................. 8
2. Safety Information .......................................................................................................9
3. Installation and Functional Test of Power Supply .................................................. 11
4. Functions and Controls ............................................................................................13
Front Panel .. ... ............................... .. ...................................................................... 13
Back Panel....................................
.. ....................... .. ................... .. ......................... 15
Connectors and
Pin Assignments ......................................... .. ............................. .. 17
Default Settings.......... .. ................... ... ................................................. ... ............. ... 17
5. LIAC Lock-In Amplifier Cassette..............................................................................18
Interface/Precision Oscillator Board .................. ... . .. .................. .. .......... .. ............... 18
Installation. .. ........................................................ .. .. ... ................ .. .......................... 19
Technical Details...... ...... .. ............................................. .. ......... .. .......................... .. 21
6. Matching Unit LEED (MUL)....................................................................................... 22
7. Operation ................................................................................................................... 23
Filament Operation.................. .. ................................... .. ................ ... .................. ... 23
Emission Current Regulation......................................................................... 23
Beam Current Measurement.........................................................................
24
Hints of Operation ......... .... ..................... ... ............................................................. 24
8. Technical Information ............................................................................................... 25
Layout of Unit............................................................... .. . .. .....................................25
Reference Potentials '0' and 'K'..............................................................................
25
Principle of Operation ... ... .. .. ... ....................................... .. ................ .. ... ... ............... 26
9. Adjustments .............................................................................................................. 27
Filament Current Limit............................................................................................ 27
Emission Control Circuit................................. ... ...................... .... .......... ... .............. 27
February 1998 Versi
on 1.2

Preface 4 NG LEED (S) Technical Reference Manual
10. Maintenance ............................................•.............................................................. .. 28
Faultfinding Guide.......... .. .. .. . .. . .. .. ........ .. .. ... .. ........................... .. ... .......... ... ......... ... .28
11. LIAC Operation in Digital Mode ................... ~ ·· i · f · ·· ··+ ··· / ·· +· l ··· + ··· + ·· + ··· / ··· j ··· j ··2 f
12. Circuit Diagrams ......................... .. ....... .. ............ .. ..............................•......•.............. 31
Service Procedure ..............................................................................•....................... .. . 81
Useful OMICRON Addresses .........................................................•..............................83
lndex .......................................................... .. ...... .. ...r ····· ··· ·· · .................................
84
List of Figures
Figure 1: FT 12 connectors: always tighten the fixing screw........................... ...... .. . .... . 2
Figure 2: Front panel layout, schematic diagram. ........................ .. .. ... .. .. ..... ... .... .. ... ..... 3
Figure 3: Back panel layout, schematic diagram......................
.... .. .... ........ .. ... .. .... .. . ... .. 5
Figure 4: The lock-in amplifier module LIA. ..........
.. ................................ .. ....... .......... . ... 0
Figure 5: Location of boards, jumpers and fuses within the unit.. .... .............. .. ........ .. . .. . 5
Figure 6: Principle of operation, schematic diagram...............
.. .. .. ................ .. .......... . ... 6
List of Tables
Table 1: Related manuals......... .. .......................................................................... .. ....... 2
Table 2: Address settings using JP5 and JP6... .. .......... .. .............. .. ............... .......... .. ... 8
Table 3: Time constant logical levels. .......... .. .. .. .............................. .. ............. .... .. .... ..... 9
Table 4: Slope and input logical levels......... .. ...... .. ............ .. ........................ ... ....... .. . . .. . 9
Table 5: Sensitivity logicallevels........ .. ............ .... .... .. .......... .. ...... .. .. ............... .......... . .. . 0
Table 6: Phase settings ofthe lock-
in ... .. ......................... .. .......... .... ................. .. ..... .... . 0
February 1998 Versi
on 1.2

Preface 5 NG LEED (S) Technical Reference Manual
Conditions of CE Compliance
OMICRON instruments are designed for use in an indoor laboratory environment. For
further specification
of environmental requirements and proper use please refer to your
quotation and the product related documentation (i.e. all manuals, see individual packing
list).
The NG LEED SPECTALEED Control Unit complies with CE directives as stated in your
individual delivery documentation if used unaltered and according to the guidelines in the
relevant manuals.
Limits of CE Compliance
This compliance stays valid if repair work is performed according to the guidelines in the
relevant manual and using original OMICRON spare parts and replacements.
This compliance also stays valid if original OMICRON upgrades or extensions are
installed to original OMICRON systems following the attached installation guidelines.
Exceptions
Omicron cannot guarantee compliance with CE directives for components in case of
• changes to the instrument not authorised by OMICRON, e.g.
modifications, add-on's, or the addition of circuit boards or
interfaces to computers supplied by OMICRON.
The customer is responsible forCE compliance of entire experimental setups according
to the relevant CE directives
in case of
• installation of OMICRON components to an on-site system or
device
(e .g. vacuum vessel),
• installation
of OMICRON supplied circuit boards to an on-site
computer,
• alterations and additions to the experimental setup not explicitly
approved by OMICRON
even if performed by an OMICRON service representative.
Spare Parts
Omicron spare parts, accessories and replacements are not CE labelled individually since
they can only
be used in conjunction with other pieces of equipment.
February 1998 Version 1.2

1. Introduction 6 NG LEED (S} Technical Reference Manual
1. Introduction
General Description
The SPECTALEED control unit provides all necessary electrical supplies to operate
various OMICRON rear-view LEED optics
in LEED mode. It supplies the high voltage for
the screen, the suppressor grid voltage and the heating current for the cathode ofthe
integral electron gun. Voltages are generated to drive the electron-optical elements of the
gun at kinetic energies up to 1000
eV.
In addition the control unit can run the SPECTALEE ~ op~c Ei · n Auger ~ l de . lt r~ vide f
1
all
necessary voltages for the internal electron gun (up o 3. ~ ) for a foe ed b a , an
the retard voltage which has to be set by an external pro r~ ming volt e.
An optional electronics package upgrades the SPECTALEED together with the
NG LEED
to a retarding field analyser wi th fully computer controlled data acquisiti on . The electronics
package NG LEED S comprises
NG LEED
• lock-in amplifier integrated into the NG LEED,
• combined interface I precision-oscillator board integrated into the
PC,
matching unit MUL consisting of a preamplifier and a modulator,
• and all necessary control software for lock- in amplifier, retarding
voltage and data acquisition.
The NG LEED
is equipped with an emission current regulation in order to provide a stable
beam current. The beam current can be measured and monitored without biasing the
sample.
NORMAL USE
The NG LEED SPECTALEED Control Unit supplies the SPECTALEED optics with the
filament heati
ng current and the voltages for the lens elements of the electron gun, for the
grid and for the LEED screen.
The NG LEED SPECTALEED Control Unit shall always be used in combination with
either a flange mounted gun SL 1000 I SL 1000 SPA
or a Channelplate optics and NG CPL control unit
or a SPECTALEED optics
or a SPECTALE ED Auger package consisting of
February 1998 Versi
on 1.2

1.1ntroduction 7 NG LEED (S) Technical Reference Manual
l1.SPECTALEED optics
2. NG LEED S: LEED/Auger electronics package
3. PC PEN LEED including OAT 100 data acquisition
software and LIAC control software
or a SPA-LEED package consisting of
li=ipa-leed optics
2. NG LEED: SPECTALE ED control unit
3. NGSPA: SPA-LEED control unit
. ..
4. MUS: matching unit SPA-LEED
5. VOR: preamplifier
6. PC PEN SPA including SPASO SPA-LEED software
Please note: CE compliance for a combination
of certified
products can only
be guaranteed with respect to the lowest level
of certification. Example: when combining a CE-compliant
instrument with a CE 96-compliant set
of electronics, the
combination can only
be guaranteed CE 96 compliance.
The
NG LEED SPECTALEED Control Unit shall always be used
with original cable sets which are explicitly specified for this purpose
• with all cabling connected and secured, if applicable
• with all electronics equipment switched on
in an indoor research laboratory environment
by personnel qualified for operation
of delicate scientific equipment
in accordance with all re lated manuals.
& Warning: Lethal Voltages!!
February 1998
Adjustments and fault finding measureme s
as
~ell a~
installation procedures and repair work
may pnly b
~car
out by authorised personnel qualified to ha
~die I ~thai
oltag
Attention: Please read the safety information
in all relevant
manuals before using the instrument.
ed
~s .
All connectors which were originally supplied with fixing
screws must always be used with their fixing screws
attached and tightly secured.
Version 1.2

1. Introduction 8 NG LEED (S) Technical Reference Manual
Technical Specification
-- ----, ·-
--
-· -
.------
Mains Input 90-264 V,
50/60Hz (150 VA)
Beam Energy I
/Cathode Potential 0 to -3.5 kV, 100
IJA with respect to grour d/earth
Filament Heating 0 to 2.7 A, 0-10 V, floating, centre tapped to cathode potential
Current
Wehnelt 0 to -100 V, 2
mA with respect to cathode potential
Anode +400 V, 2 mA, fixed, with respect to cath pde potential
~---
Lens 1 and Lens 3 -20 V to +2.5 kV, 50 IJA with respect to c thode potential
-
Lens 2 -20 V to +1 .1 kV, 50 IJA with respect to c thode potential
Screen 0 to +7 kV, 500
IJA with respect to earth in steps of 1 kV)
Suppressor 0 V or 80% to 110% of beam energy
IRetard 0 to -2.0 kV, 50
IJA with respect to groun /earth
j Preamp Power ±15 V, 100
mA with respect to ground/earth
±300 V, 50 IJA with respect to ground/ea h
L_
DISPLAY
Gun Parameters 4 1/2 digit panel meter
Current Monitor
__ j
MONITOR OUTPUTS
1Beam Energy
E0 Monitor
Beam Current
1
0 Monitor
0 to +10 V equiv. 0 to -1000 V in LEED mode or ... j
0 to +1 0 V equiv_0 to -3.5 kV in Auger mode
· ---~
1 V per IJA
I
REMOTE CONTROL (switch on/off)
Beam Energy 0 to +10
Vequiv . 0 to -1000 V in L_E_E_D - m . _ od-e-or- ~--+----l
0 to +10 V equiv_0 to -3.5 kV in Auger mode
(+1
0 V reference output is provided)
MECHANICAL
---.- ---- - -
19 inch rackmount width 448.5 mm (84 U), height 132.5 mm (3 U), depth 400 mm
case
~~-~ ~--+------------ ------ ----- - -- --- -- ----- -- -- --
weight 9
kg incl. LIAC
Cables for connecting the screen
HV , grids and electron gun are supplied together with
the SPECTALEED optics. Standard length is 5 m.
February 1998 Versi
on 1.2

2.Safety Information 9 NG LEED (S) Technical Reference Manual
2. Safety Information
Important:
• Please read this manual and the safety information in all related
manuals before installing or using the electronics equipment.
• The safety notes and regulations given in this and related
documentati on have to be observed at all times.
• Check for correct mains voltage before connecting any equipment.
• Do not cover any ventilation slits/holes so as to avoid overheating.
• The NG LEED may only be handled by authorised personnel.
/1.. Warning: Lethal Voltages!!
Adjustments and fault finding measurements may only be carried out by
authorised personnel qualified to handle lethal voltages.
• Lethal voltages may present at the SCREEN and BEAM SHV sockets
and at the GUN 13-pin socket during operati
on .
• Lethal voltages are present inside the NG LEED I NG LEED S.
A Always
• All connectors which were originally supplied with fixing screws
must always be used with their fixing screws attached and tightly
secured.
• Always disconnect the mains supplies of all electrically connected
units before
-opening the vacuum chamber or a control unit case,
-before touching any cable cores or open connectors,
-before touching any part of the in-vacuum components (except
for tip and sample exchange
as described in this manual).
• Leave for a few minutes after switching off for any stored energy to
discharge.
February 1998 Versi
on 1.2