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On the data collection computer: |
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log in as "specuser", if necessary, the
password is available from the CHESS and MacCHESS personnel; |
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check the disk
space available for data collection and create the directory with PI's
name; |
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type "start_ccd"
in the terminal window to start data collection program; |
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two windows, "ADX"
and "ADX Status", will appear. |
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On the hardware control computer: |
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log in, if
necessary, as "specuser" using the same password; |
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press the
MacCHESS icon to start Rspec program: "OpsTerm@f1.chess.cornell.edu" and
"CHESS spec functions", each on its own window. |
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Make sure there is a beam passing
through the collimator. |
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In the "OpsTerm@f1 window" type: |
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opens - to check the counts by opening
the shutter in front of the collimator; |
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closes -
to close the shutter; |
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if counts are
low, align the optical table using the "Quick Table Alignment button" on
the "CHESS spec functions" window. |
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In the "CHESS spec functions"
window use: |
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Quick Table Alignment
- this is the
alignment to use in most cases. Make fine adjustments to the optical
table to align the collimator with the beam and to maximize counts
through the collimator. If counts do not return to previous value, call
CHESS operator for help. If you are getting the messages "define_table"
or "set_table_zero", follow the instructions and press "Define Table" or
"Set Table Zero" buttons found in the "CHESS spec functions" window.
Equivalently, you may type command "quick_align" in the "OpsTerm@f1"
window. |
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Set Table Zero
- this must be done
whenever the motors that control the table position have been moved for
some reason, i.e. not through "align_table" or "quick_align" macros.
This command defines the current optical table position to be the zero
position. |
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Define table - enter optical table
parameters. You will be asked for parameters. Normally, you will accept
the default (standard table) values. Press OK. |
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Interrupt Spec - stops motor motions
immediately and returns to the original position. Equivalent to typing
"abort" in the "OpsTerm@f1" window. |
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| On the station computer (A1
& F1, or Guideline for F2) open terminal window and type "start_centering"
to bring up automatic crystal centering program: |
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double click on the crystal in order to
bring the crystal to the crosshair; |
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rotate the spindle 90 degrees and double
click on the crystal again and so on; |
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rotate the crystal 360 degrees to insure
perfect centering. |
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| If you have problems
centering the crystal, please go to
"Crystal centering problems" |
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Raise the safety shield in front of the CCD after you close the hutch
door: |
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press
the black button on the control panel and make sure green "Garage door"
light is on; |
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watch
the video monitor to be sure the shield moves sideways; |
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if
the shield does not move, check: |
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if there is a
beam through the collimator; |
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if the beam stop
is in place; |
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Remember to raise
the safety shield every time you close the door in the hutch! |
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Project setup (optional):
on data collection software program use Setup/Project to enter file
names, etc. ADX will create a subdirectory for you, if necessary, but
not multiple levels of directories. |
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Snapshot Mode: use
Setup/Snapshot to take a test exposure from your crystal. Take more
exposures, if necessary, to optimize the data collection parameters: |
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make
sure you tell the program to take a new dark current with the exposure
time that you have selected; |
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the
first snapshot will start up an ADXV display process; for display of
multiple snapshots keep ADXV running; |
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rotate the crystal by entering a new phi value; |
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set
direct beam position parameters: |
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press
Edit/Settings; |
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enter approximate
coordinates for x and y in the appropriate fields if you do not see the
cross on the screen; |
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use arrows for
fine adjustment of the direct beam center position; |
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to
view the resolution rings: |
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press "Resolution
rings On" (make sure the CCD distance is correct). |
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Run Mode: data collection
is normally conducted through the "Run" window (press Setup/Run(s)): |
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for normal data
collection in ADX control panel use the "Display" button to turn on the
"Follow images" mode, if you do not already have an "ADXV" window; |
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check the
directory; |
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set data
collection parameters; |
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check the direct
beam position parameters; |
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start collecting
data by activating the "Collect" button; |
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the program
starts the data collection by taking the new dark current image
automatically and retakes the background image (optional) every certain
period of time (7200 seconds), set this up in "CCD Config" window (press
Config/CCD). |
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Data files are corrected while
subsequent images are being recorded, and corrected files may be
processed during data collection with minimal effect on running. Raw
images are saved by default, but if you do not need them: |
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open "CCD Config"
window (press Config/CCD); |
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uncheck "save raw
images" option. |
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"ADX Status" window shows the current image name, spindle angle, and CCD
distance. |
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| To
interrupt the data collection: |
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use the ADX
control panel function "Stop/After Current Image" and let the
oscillation end; |
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To resume the data collection: |
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in the "Run"
window click on "Restart", a new window will appear in which you can
enter the Run # and the Frame # at which you wish to restart;
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if you give a
value lower than the current frame, data files will be deleted so that
there is no duplication of files; |
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click OK in the
"Restart" window; |
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When a run is complete, you can
start another by setting parameters in the "Run" window and activating
"Collect". For a new crystal, repeat from step "Crystal centering". |
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To terminate
programs: |
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type "stop_ccd"
in any window, this stops all processes on the data collection
computer. |
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