An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
Remove the snout (will need the crane/george’s group)
Check collimation
Reatach bt-4 tas x-rail
Attach the bt-4 tas monitor to power
Repower the monitor (note the monitor is at 499.5 Volts, the detector is at 1276V)
SETUP TAS
Check that the correct monochromator is in:
d1h=25. This is necessary to give the monochromator room inside the drum to move in the z-direction. On the instrument rack immediately above the instrument computer, you will find the “goniometer drive” panel. This panel controls the x,y, and z motions of the monochromator. You will also find a table of values for each motion taped to this panel. Once you have executed step (a):
Turn the “goniometer drive” panel knob to the desired direction to be moved (in this case “Z”)
Place the “Drive” toggle in the direction of motion (+/-)
Use “Slew” switch to drive the monochromator to the desired position
Use the “Bump” switch when approaching the desired position to avoid overshooting, which can damage the monochromator
Change the software value for the monochromator d-spacing using either dm=PG or dm=Cu in icp.
Verify xpeek is started
Check the zero for the detector 2 theta
Use fndlam to get the correct two theta for the monochromator and to find the wavelength
Rock the monochromator at several energies that you plan to use:
fm 1,2,-.1,-2
set 1= <value found>
pz
record Z01 in the log book
repeat for several energies and record E, Z1, a1
exit ICP by typing “ex”
cd /bt4/cfg
vim ZCOEFFS.CFG
change the values for “slope” and “intercept” (the numbers in front of !z1coeff1 and !z1coeff2)
save the file
set z1=-99 (which is flag to use a linear correction for the zero point vs theta)