Tag Archives: filament

25-110 Analyzer Filament

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This is an old tech tip that I wrote back in 2002. The 25-110 analyzer was the first CMA that Physical Electronics used a Lab6 filament in. These days there are not a lot of 590 systems still in operation, but the ones that are still work well especially as depth profile instruments. RBD provides Lab6 filaments and repair services for the venerable 590 scanning auger systems and the 25-110 analyzer.

General tips:

Use gloves.

Clean and demagnetize all of your tools.

Place all removed parts on a clean work area covered with aluminum foil.

If possible, dust off all parts with nitrogen as you re-assemble them.

Never force any part that doesn’t want to go.

Use methanol as a lubricant if screws don’t move easily.

 

To replace the filament in the 25-110 analyzer:

  1. Remove the magnetic shield (4 screws).
  2. Carefully remove the conical ceramic ring (4 flat-head screws) and remove the conical ceramic.
  3. Remove the outer cylinder (1 screw), being careful not to force it. If necessary, use a heat gun to loosen it up.
  4. Separate all of the wires in the bottom of the analyzer using 2 needle-nose pliers or tweezers. Be careful not to stress the wires.
  5. Position the wires so that you can easily remember where they belong. In the case of the F1 and F2 wires, this is easy. For the DELF/STIG wires, position the wires as upper right and upper left, lower right and lower left.
  6. Loosen the 4 spline set screws on the top of the inner cylinder by 1 turn CCW.
  7. Remove all but one of the 8 screws around the middle of the inner cylinder.
  8. Remove the upper inner cylinder grid cap (4 set screws).
  9. Holding on to the nose of the electron gun, remove the final screw at the middle of the inner cylinder.
  10. Carefully pull the electron gun up and out of the inner cylinder. Be careful not to stress any of the wire connectors.
  11. Place the electron gun on a sheet of aluminum foil.
  12. Loosen the bottom cap of the electron gun (4 screws and 4 set screws).
  13. Carefully slide the bottom cap down the ceramics for about 2 inches, enough room to get at the filament.
  14. Remove the filament assembly (4 cap screws, 2 splines connecting the filament wires).
  15. Install the new filament assembly and reverse all of the above steps.
  16. When you slide the electron gun ceramic tubes back down inside the analyzer be careful not to crimp the copper foil on the ceramics.  Also make sure that you tighten the set screws to hold the copper foil in place. If the copper foils slides up the ceramic it may cause arcing in the electron gun.

 

 

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Neutralizer filament replacement procedure

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This post will detail the neutralizer filament replacement procedure for the Physical Electronics (PHI) 04-085 and 04-090 neutralizers that are commonly found on many PHI X-ray photoelectron spectrometers and Static SIMS systems.

Before you can replace the filament you need a new filament. We also recommend having the deflection ceramic on hand, as well, since the deflection ceramic is usually cracked when you remove it as part of the neutralizer filament replacement procedure. The neutralizer ceramic and neutralizer filament are readily available from RBD Instruments dot com.

The part number for the filament (exchange) is 04090RF and the part number for the ceramic is 615838PR

Procedure

This procedure assumes that the system has been vented and the neutralizer is on a clean work area. Use clean tools and wear gloves while working on the neutralizer to prevent any oil contamination on the neutralizer parts. Tip: Use UHV aluminum foil to keep the work area clean, and fold up the ends of the aluminum foil to make a tray that will trap any small parts that you may drop during the procedure.  The pictures at the bottom of the post are helpful.

  1. Remove the 4 screws that hold down the exit aperture.
  2. Remove the exit aperture.
  3. Remove the 4 shoulder washer ceramics from the deflection plates.
  4. Lift up the 4 deflection plates and position the wires so that you can remember where they go back to later.
  5. Remove the deflection ceramic. If it is not in broken into pieces you can reuse it.
  6. Lift up the anode aperture and position the wire to the side. There is a groove in the filament housing so it can only go back one way.
  7. Remove the three screws at the bottom of the filament housing. Tip: Scribe the side of the filament housing to help you remember the orientation later.
  8. Remove the filament housing. Note that the anode ceramic will still be inside the filament housing.
  9. Remove the wehnelt cap.
  10. Hold the filament in place and slide the filament connectors down and off of the filament posts.
  11. Remove the filament.
  12. Install the new filament. While holding the filament in place slide the filament connectors on.
  13. Install the wehnelt cap (carefully) over the filament.
  14. Install the filament housing over the wehnelt cap and install then tighten the three screws that hold the filament housing to the neutralizer support base.   Make sure that the tip of the filament is centered in the wehnelt cap.
  15. Install the wehnelt ceramic over the wehnelt cap and center the wehnelt cap within the ceramic. If necessary, loosen the three filament housing screws to adjust the housing position a little bit, and then re-tighten them.
  16. Install the anode aperture ceramic.
  17. Install the deflection ceramic.
  18. Move the deflection plates into position and install the shoulder washer ceramics into the deflection plates.
  19. Place the exit aperture on top and install the screws to hold the exit aperture on top of the shoulder washer ceramics. This can be a little tricky.
  20. With the top screws tightened only slightly, adjust the space between all four deflection plates so that they are even, and tighten the four screws.

Installation is complete! When you burn in the new filament, start out with a low emission value and increase it until the filament is just starting to glow orange. Let the neutralizer outgas in that mode for an hour or so, then slowly bring the filament up to the normal emission setting as needed.

10-155 Filament replacement procedure

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This blog post is an updated version of the 10-155 filament replacement procedure first published on the RBD Instruments website as a Technical Tip a number of years ago. This version has been updated with some close up pictures of the electron gun assembly shown at the bottom of this post.

Use gloves, de-magnetize all tools and clean all tools with Isopropanol.

  1. Set analyzer on stand or use manuals and support analyzer on handles, facing up.
  2. Remove outer magnetic shield (4 screws)
  3. Remove inner magnetic shield (4 screws)
  4. Carefully remove conical ceramic
  5. Loosen VM (outer cylinder) wire and lift inner cylinder off of base ceramic.
  6. Remove 3 screws inside inner cylinder.
  7. Carefully lift inner cylinder up and off of the electron gun assembly. Note: If the inner cylinder does not move freely, use a heat gun to expand the inner cylinder so that it will slide off. Do not force it!
  8. Look at the 10-155 electron gun detail PDF file to familiarize yourself with the electron gun assembly.
  9. Remove the three long screws that hold the electron gun assembly together.
  10. Remove the V1 emission screw
  11. Remove the 2 filament couplers from the filament posts. You will need a .048 4 spline wrench.
  12. Remove the 3 filament ceramics.
  13. Remove the filament assembly. Note the orientation of the emission tab and filament posts.
  14. Remove the 3 screws that hold the filament base on and remove the filament.
  15. Install the new filament in the same orientation as the old filament into the emission cap.
  16. Install the 3 screws and the filament base and tighten slightly.
  17. Position the filament so that it is centered in the hole and tighten the 3 screws. This is best done using a microscope.
  18. Install the filament assembly on top of the 3 filament ceramics and use the 3 long screws to hold the assembly together. The three long screws need to be tightened so that they all have the same distance with respect to the base.
  19. Reconnect the V1 wire
  20. Reconnect the filament couplers.
  21. Ohm out the connections to the filament and V1.
  22. Degauss the gun assembly.
  23. Install the inner cylinder over the electron gun assembly.
  24. Reinsert and tighten the three screws inside the inner cylinder.
  25. Reinstall the outer cylinder and attach the VM wire.
  26. Carefully install the conical ceramic. The resistor part should be 180 degrees out from the bottom flat ceramic. Ohm out VM to ground and make sure it has the correct resistance – typically that is about 3 Meg ohms from VM (the outer cylinder) to ground. You may need to shim the inner or outer cylinder with some silver or platinum foil, see the 10-155 shim document for more information. Both the flat and conical termination ceramics need to make a good electrical connection in order for the CMA to properly focus the electrons into the analyzer aperture.
  27. Install the inner magnetic shield
  28. Degauss the analyzer.
  29. Install the outer magnetic shield.
  30. Degauss the analyzer. Installation complete!

RBD Instruments provides the C75-010 filament and electron multiplier used in the 10-155 CMA. Contact us for more information.

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