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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 data
collection
computer 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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Close the
hutch door and raise the safety shield in front of
the CCD detector: |
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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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press on "Pick Center" button; |
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set the mouse pointer at the beam
center and double click; |
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use arrows for fine
adjustment of the direct beam center position; |
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Pick3 button provides a
method of setting the beam center by selecting 3 points with the
left mouse button. The 3 points define a circle, and the beam
center is assigned to the center of the circle. |
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there
are few options to view and set the resolution rings: |
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the pre-existing option of 5
uniformly spaced resolution rings has been kept as the 5Ring
option; |
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Anchor1, draws a single
resolution ring through a point selected with the left mouse
button, the ring is updated as the beam center is moved, but
always includes the picked point; |
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Behenate
draws a series of rings corresponding to the low resolution
rings of Ag behenate based on dividends of 58.38 Angstroms; |
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two other menu options for
automatic refinement of the ring center and automatic refinement
of distance with Ag behenate are not finished and are not active
at present. |
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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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