Chemical Dynamics Beamline

Beamline Hardware Tutorials

How to Take Light at Terminal 1

From the BL controls screen, push Set to T1. This will move the 9.0.1 M1, 9.0.2 M2, M3, and M7 into the proper position for taking light at T1.
On the EPS screen, ensure mirrors 9.0.1 M1 and 9.0.2 M2 are in correct position for operation at BL 9.0.2.1. If the mirrors are not in the correct positions, please contact a BL scientist.
Click 9.0.2 EPS Online button.
Click T1 EPS Online button.
Open all closed valves along the beam path to T1
Open Gas filter inlet, see Section How to Fill the Gas Filter.
Open 9.0 PSS1 and 9.0.2 VVR1.

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How to End Beamtime at T1

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How to Take Light at Terminal 2

From the BL controls screen, push Set to T2. This will move the 9.0.1 M1, 9.0.2 M2, M3, and M4x into the proper position for taking light at T2.
On the EPS screen, ensure mirrors 9.0.1 M1 and 9.0.2 M2 are in correct position for operation at BL 9.0.2.2. If the mirrors are not in the correct positions, please contact a BL scientist.
Click 9.0.2 EPS Online button.
Click T2 EPS Online button.
Open all closed valves along the beam path to T2.
Open Gas filter inlet, see Section How to Fill the Gas Filter .
Open 9.0 PSS1 and 9.0.2 VVR1.

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How to End Beamtime at T2

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How to Take Light at Terminal 3

Move the T3 mono into place, see section How to Move the T3 Mono In.
Flip the switch on the mono chamber to "in" see section How to Move the T3 Mono In.
Push Set to T3. This will move the 9.0.1 M1 and 9.0.2 M2 into the proper position for taking light at T3.
On the EPS screen, ensure mirrors 9.0.1 M1 and 9.0.2 M2 are in correct position for operation at BL 9.0.2.3. If the mirrors are not in the correct positions, please contact a BL scientist.
Click 9.0.2 EPS Online button.
Click T3 EPS Online button.
Open all closed valves along the beam path to T3.
Open Gas filter inlet, see Section How to Fill the Gas Filter .
Open 9.0 PSS1 and 9.0.2 VVR1.

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How to End Beamtime at T3

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How to Take Light at Terminal 4

From the BL controls screen, push Set to T4. This will move the 9.0.1 M1 and 9.0.2 M2, M3, and M7 into the proper position for taking light at T4.
On the EPS screen, ensure mirrors 9.0.1 M1 and 9.0.2 M2 are in correct position for operation at BL 9.0.2.4. If the mirrors are not in the correct positions, please contact a BL scientist.
Click 9.0.2 EPS Online button
Click T4 EPS Online button
Open all closed valves along the beam path to T4
Open Gas filter inlet, see Section How to Fill the Gas Filter.
Open 9.0 PSS1 and 9.0.2 VVR1.

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How to End Beamtime at T4

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This tutorial details how to fill the gas filter during daily operations. If you are filling the gas filter for the first time after a shutdown, please see the How to Fill the Gas Filter Complete Section.

Ensure 9.0 PSS1 and 9.0.2 VVR1 are closed at the EPS screen.
Ensure gas cylinder valves and regulator hoke valves are closed on all four cylinders.
From the EPS screen open the gas inlet valve to pump out the gas cell.
When the pressure in the cell nears zero Torr, close the gas inlet on the EPS Screen.
Open the gas cylinder valve and regulator hoke valve for the desired gas and do not adjust the regulator.
Open Gas filter inlet .
Monitor the pressure in the cell. The pressure in the gas cell may be adjusted with the gas cell regulator. Pressures should not exceed those listed in the following table.

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Gas Cell Pressures

Gas	Cutoff Energy (eV)	Gas Cell Pressure (Torr)
Argon	15.8	25-30
Helium	24.8	15-20
Krypton	14.0	25-30
Neon	21.6	25-30
Xenon	21.0	25-30

How to Fill the Gas Filter Complete

Ensure 9.0 PSS1 and 9.0.2 VVR1 are closed at the EPS screen.
Ensure gas cylinder valves and regulator hoke valves are closed on all four cylinders.
From the EPS screen open the gas inlet valve to pump out the gas cell.
When the pressure in the cell nears zero Torr, close the gas inlet on the EPS Screen.
Close the manual valve to the gas cell.
Open the gas cylinder valve and regulator hoke valve for the desired gas and adjust the regulator to approximately 35 psi.
Open Gas filter inlet.
Slowly open the manual valve to the gas cell while monitoring the pressure in the cell. The pressure in the gas cell may be adjusted with the gas cell regulator. Pressures should not exceed those listed in the above table.

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How to Change Gas Cylinders in the Gas Filter

From the EPS screen, close the gas inlet valve to isolate the gas cylinder.
Close the gas cylinder valves and regulator hoke valves.
Disconnect the regulator from the gas cylinder with the 1" wrench. The regulator will hang from the strut frame.
Take cap off new cylinder and screw cap on the empty cylinder for transport.
Disconnect earthquake safety straps on empty cylinder.
Earthquake strap the new cylinder in place.
Attach regulator onto the new cylinder.

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How to Move the T3 Mono In

Ensure 9.0 PSS1 and 9.0.2 VVR1 are closed at the EPS screen.
Rotate the knob on top of the T3 mono chamber, clockwise, until the desired grating is in the beam path. The high energy grating is marked #2.
Flip the switch on the mono chamber to "in" to indicate to the EPS and BL controls that the mono is in place.

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How to Adjust the T3 Grating Zero Order

Move the grating into the proper place, see Section How to Move the T3 Mono.
Follow the instructions for How to Take Light at T3.
From the BL controls screen T3 grating tab, select Go to Zero Order.
Check the vertical position of the beam at the slits. It is helpful to close the slits. The beam should be centered vertically on the slits.
To adjust the zero order, select T3 grating from the drop down menu on the motor display.
Click the Mode button to select Jog to make small adjustments. Enter the desired adjustment value, usually around 0.001mm, and select the up or down arrow to move the beam. Note that the up arrow will move the beam down and the down arrow will move the beam up.
Once the zero order value is determined, save the new value for reference.

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How to Move the T3 Mono Out

Ensure 9.0 PSS1 and 9.0.2 VVR1 are closed at the EPS screen.
Rotate the knob on top of the T3 mono chamber, clockwise, until the two grating mounts are parallel in the mono chamber. This will allow light to pass through to the next optic.
Flip the switch to "out" beside the mono chamber to indicate to the EPS and BL controls that the mono is no longer in the beam path.
With 9.0 PSS1 open, look through the top window of the mono chamber to check for scatter. There should be no scatter if the mono is out of the beam path.

If the switch on the mono chamber has not been flipped to the appropriate setting, the BL controls software will not allow other optics to move.

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How to Use the Endstation Interlock Box

Install pneumatic valves for each endstation turbo pump's foreline vacuum pump. The pneumatic valve should be on the turbo pump side of the manual valve on the foreline pump.
Install a convectron gauge for each foreline vacuum pump. Ensure that the convectron gauge is on the turbo pump side of the pneumatic valve.
Inline with the pneumatic valve and convectron gauge, connect vacuum lines to the exhaust of each endstation turbo pump and each foreline vacuum pump.
Plug one end of the air line, available at the endstation, into the pneumatic foreline valve.
Plug the opposite end of the air line into the house air manifold near the terminal. The house air uses a quick connect system.
Locate the endstation interlock box and sort the cables into the labeled pairs. The cables should be labeled 1-4 at the ends.
Plug one cable of each pair into the convectron gauge, and plug the corresponding other cable into the pneumatic valve. Make sure each cable is securely fastened.
Flip the switch on the interlock box to turn on the vacuum pressure override in order to pump down the system. The red lights next to the switch should flash.
Press the button on the interlock box to open the pneumatic valve.
Turn on the foreline vacuum pump, and slowly open the manual valve.
Let the system pump down.
Turn on the turbo pumps for the endstation.
Once the pressures on the convectron gauges are below the interlock threshold, indicated by the two green lights on the convectron gauge, flip the switch on the interlock box to turn the override to the off position. The system will now be protected against vacuum trips.
It is a good idea to periodically check to make sure the convectron pressures are suitable and that the pneumatic valves are still open as the cable connections may be sensitive.

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Beamline Controls Tutorials

How to Open the Motor Display Window

Select "Motors" from the BL controls screen menu bar.
Select "Display", and the Motor Display.vi should open.

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How to Adjust the Undulator Energy

Select Undulator Energy from the dropdown menu on the Motor Display screen.
Enter the desired value in the Move box and push the "Move" button to the left.

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How to Adjust the HBDA

Select HBDA position from the dropdown menu on the Motor Display screen.
Enter the desired value in the Move box and push the "Move" button to the left. Note: Nominal position of the HBDA is 0.0mm, typically where the central cone of the undulator beam is defined.
Select HBDA width from the dropdown menu on the Motor Display screen.
Enter the desired value in the Move box and push the "Move" button to the left. Note: Nominal widths of the HBDA range from 4mm to 10mm, depending on desired resolution.

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How to Adjust the VBDA

Select VBDA position from the dropdown menu on the Motor Display screen.
Enter the desired value in the Move box and push the "Move" button to the left. Note: Nominal position of the VBDA is 0.0mm, typically where the central cone of the undulator beam is defined.
Select VBDA width from the dropdown menu on the Motor Display screen.
Enter the desired value in the Move box and push the "Move" button to the left. Note: Nominal widths of the VBDA range from 4mm to 10mm, depending on desired resolution.

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How to Set the T3 Mono Energy

Select Mono T3 Energy from the dropdown menu on the Motor Display screen.
Enter the desired value in the Move box and push the "Move" button to the left. Note: When compensation is turned on, the undulator will move to the selected energy as well.

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How to Set the T4 Mono Energy

Select Mono T4 Energy from the dropdown menu on the Motor Display screen.
Enter the desired value in the Move box and push the "Move" button to the left. Note: When compensation is turned on, the undulator will move to the selected energy as well.

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How to Adjust the Mono and Undulator Compensation

To turn compensation on, which moves the undulator and T3 or T4 grating together, push the compensation button on the BL controls screen. When compensation is on, the button is a dark gray color.
To turn compensation off, which allows the undulator and T3 or T4 grating to move independently, push the compensation button on the BL controls screen. When compensation is off, the button is a light gray color.

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Beamline Controls Advanced and Troubleshooting Tutorials

How to Set the Undulator Gap Polynomial

Select "Motors" from the BL controls screen menu bar.
Select "Set Up Parameters", and the Setup Motor Parameters.vi should open.
In the Setup Motor Parameters vi, select Undulator Energy from the list on the left-hand side of the window.
Enter the new desired/calculated polynomial coefficients on the right-hand side of the window.

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How to do a Single Motor Scan

Select "Scanning" from the BL controls screen menu bar.
Select "Single Motor Scan", and the Single Motor Scan.vi and Setup Single Motor Scan Parameters.vi should open.
Select the motor to scan from the X Motor dropdown menu on the Setup Single Motor Scan Parameters.vi
Input the start and stop and increment steps on the setup window.
Input the desired Delay after Move and Count Time on the setup window.
In the Single Motor Scan.vi window, choose the appropriate channel to plot by adding or removing channels from the list.
Click Start on the scan window.
The data will be saved in the displayed filepath.

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How to Add a Computer to the Network

Select "Beamline" from the BL controls screen menu bar.
Select "Setup TCP Server", and the Setup BCS TCP Server Parameters.vi should open.
If the user computer's IP address is not listed then scroll to an empty slot and type in the IP address.
Select "Function" from the Setup BCS TCP Server Parameters menu bar.
Select "Save".

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How to Optimize Optics

Get a signal, i.e. photodiode current or ion count, at an endstation.
Determine the optics that direct light to the endstation. For Terminal 1, the optics are M2 and M3. Terminal 2's optics are M2 and M4x. Terminal 3's optics are M2 and T3 Grating. Terminal 4's optics are M2, M3, M7, and T4 Grating.
Select an optical element from the dropdown menu on the Motor Display screen.
Click the Mode button to select Jog to make small adjustments. Enter the desired adjustment value and select the up or down arrow to move the beam.
Watch the signal as adjustments are made and stop when the signal is maximized.
Make a note in the beamline logbook of the new optic position value as well as the original optic position value.
The new value may be saved in the system, see How to Change Optic Presets.

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How to Change Optic Presets

Select "Motors" from the BL controls screen menu bar.
Select "Set Up Preset Positions", and the Setup Preset Positions.vi should open.
Select the desired optical element from the dropdown menu on the Motor Display screen
Move the optical element to the desired new position, by entering its value and selecting Move.
From the Setup Preset Positions window, select the Preset to change from the list on the left-hand side. "M2 to 9.0.2" is the preset to change M2 values. "M3 in 1/4" is the preset for M3 values at T1 and T4. "M7 in" is the preset for M7 values at T4.
With the optic sitting at the desired value, per step 4, click Use under "Use Current" on the Setup Preset window.
Select "Function" from the Setup Preset Positions menu bar.
Select "Save".

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How to Check the Software Log

Select "Logging" from the BL controls screen menu bar.
Select "View Log File", and the View Status Log File.vi should open.
This vi shows a log of the commands for a given date. The date may be changed using the left and right arrows at the top.
Searching for key words may be done by typing the keywords in the find field near the bottom.

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EPS Tutorials

The Not Symbol

To determine why an operation may not be performed, click on the Not Symbol next to the valve to be opened.
Follow the directions in the pop-up box.
Once the steps in the pop-up box have been completed. Open the desired valve.

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Online/Offline Issues

Before beginning beamtime, ensure the green light next to the, 9.0.2 EPS Online button is green.
If the light is not on, click 9.0.2 EPS Online button.
For T1, click T1 EPS Online button.
For T2, click T2 EPS Online button.
For T3, click T3 EPS Online button.
For T4, click T4 EPS Online button.
If another terminal is currently online, click the EPS Offline button for the terminal to turn the terminal offline. Then see steps 3-6.

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Reset Button

This tutorial details how to reset an ion gauge. The procedure will also apply to resetting convectron gauges, waterflow sensors and other interlocking devices in the EPS.

When the ion gauge is off or the pressure is too high, the EPS will show a red ion gauge.
After the pressure falls below the setpoint value. The gauge will flash yellow, and the Reset Button will also flash.
Click Reset. The gauge will change to green.

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