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BLISS
The Hitchhiker's Guide to ID20. Don't Panic!
February 16, 2005
Contents
Useful phone numbers
Alignment (mostly for local contacts)
Starting an experiment on ID20 (tips for the local contact)
Optics alignment
Undulators
Primary slits
First mirror
Monochromator
Undulators
Primary slits
Second mirror
Horizontal focusing
Vertical focusing
Finishing up the optics alignment
Optics fine tuning
Diffractometer alignment
Experimental geometries
Standard vertical scattering plane
vertical scattering plane
Azimuth, vertical scattering plane
Standard horizontal geometry
Horizontal 4-circle
Mounting and aligning the sample
3-axis analyzer and PA
How to align the ID20 polarization analyzer
Aligning the zero point of
tth
and the detector slits
Installing the polarization analyzer crystal
How to align the 3-axis analyzer
Before handing over
Experimental control and data analysis
What you are
not
allowed to do at the beamline.
SPEC
General remarks
Data files
Getting help
Most frequent SPEC commands
pplot
Some useful SPEC control keys
FOURC
OPTICS
Special ID20 macros/SPEC commands
The Barras temperature controller software users guide
The servers
On the crate
id202
On
stompy2
The clients
Spec
barras.gui
fsigmon.barras.
Tips and hints.
Spec command summary
C-PLOT
Optics fine-tuning
X-ray phase plate
Azimuthal dependence
Control macros
Usage in
rho_on
mode
Usage in
rho_off
mode
rho_spin
macro
Magnetic scattering cross section
Temperature control
Introduction
The Barras controller
How it works, briefly
Changing the configuration
loading calibration curves
Loading PID blocks
Changing the maximum output resistance
Selecting the regulation channels
Usual troubleshooting
the Lakeshore controller
SPEC interface
Getting Started:
Configuration from File:
INTERNALS:
MACROS:
INTERNAL MACROS:
The Lakeshore data display
Further information
the ILL Sec controller
the Oxford ITC
``intelligent'' controller
Troubleshooting
Front end won't open!
Suddenly lost counts in the detector!
A beryllium window or shroud broke!
The diffractometer ran into collision!
I cannot interlock the hutch!
SPEC is hanging!
SPEC is hanging after
reconfig
!
SPEC is ``waiting for beam'' when the beam is perfectly OK!
I need to abort a command!
Suddenly I can't move the diffractometer motors (
tth
,
th
,
chi
, and
phi
) anymore!
SPEC is giving error messages like ``cannot establish connection to host (22)''
I get BP_ERROR all the time
I am going nuts with C-PLOT!
My magnetic peak suddenly got much weaker!
The I02 diode in the optics hutch does not see the beam!
The columns in the data file do not match the header!
Cryostat problems!
pplot
problems!
Background information
Applying for beam time
Check list: I want to use ID20
I want to do magnetic scattering (resonant or non-resonant).
I want to do magnetic scattering and know the modulation wave vector.
I want to study Templeton scattering.
I want to do magnetic scattering of a ferromagnet.
I want to do magnetic scattering but don't know the modulation wave vector.
I want to study orbital ordering.
I want to study quadrupolar ordering.
I want to do DAFS (diffraction anomalous fine structure).
I don't want to do magnetic or anomalous diffraction.
Selecting the right sample environment.
Experimental configuration.
Sample requirements
Safety
Safety training
Searching procedure
Special procedures for experiments with transuranium elements
How to prepare for your experiment at ID20
Computers (also connecting your laptop & printing)
Overview of computers and network
A few useful Unix commands
Telnet, MAIL, FTP & WEB-browsing
Explain how to connect a laptop
Explain how to print
File transfer over the Internet and data backup policy
Available Laboratories
Technical Infrastructure Directory
Fundamental literature
Publications
User reports
Useful links
About this document ...
Carsten DETLEFS
(e-mail)
