Cleaning The Ion Volume And Source; Assembling The Source - Ametek Dycor Dymaxion Mass Spectrometer User Manual

6-10 | Dycor Dymaxion Mass Spectrometer

Cleaning the ion volume and source

The ion volume and the source can be cleaned gently using a soft brush, such
as a toothbrush, and a small round brush to access the interior of the ion vol-
ume.
Make a paste by mixing aluminum oxide powder (Lapmaster 1300 or
1.
equivalent) with tap water.
Using a small nylon bristle brush, wet the parts and apply the paste. A
small round brush is required to clean the interior of the ion volume and
2. the holes in the lenses. Scrub only enough to remove any deposits or
discolorations. Scrubbing too long can damage the finish on the source
parts. Rinse parts thoroughly in tap water.
Sonicate the parts in a mixture of de-ionized water and cleaner (Alcon-
3. ox Powdered Precision Cleaner or equivalent) for approximately one
hour. Remove from the sonicator.
Rinse the parts thoroughly in de-ionized water. Replace in the sonica-
4.
tor.
5. Sonicate the parts in de-ionized water for approximately one hour.
Remove parts from the water and dry the parts by baking in an oven at
6. 100 °C for 30 minutes. Alternatively, dry the parts with a heat gun until
the water has evaporated.
7. Reassemble the source

Assembling the Source

Assemble the source in reverse order of the disassembly taking care to center
each ceramic washer in its seat to prevent cracking it. Do not crush the
ceramic washer or strip the threaded parts by overtightening the source hard-
ware - tighten to snug only!
Install the source so that Lens 2 is seated against the ceramic quadru-
pole collar. The hardware binding the source together may need to be
loosened temporarily so that all the rods can fit through the ceramic
quadrupole collar holes, and so that Lens 2 can sit against the collar.
1.
Carefully insert the rods through the holes in the ceramic collar and
into the barrel connector and the detector flange assembly according
the pinout in Figure 6-6. Be sure that the screws are tightened snugly
to the hardware once the source is in place.
Install the filament as described in "Replacing the Filament" in this
2.
chapter.
Once the quadrupole head has been checked, replace the ion volume
by setting it back on the head (Figure 6-1) and secure it with the set
3.
screw. Insert the head into the vacuum chamber and secure using the
six bolts originally removed.