mat 253 ion source disassembly
TRANSCRIPT
Ion source Ion source maintenance on the maintenance on the MAT 253MAT 253Disassembling the ion Disassembling the ion source…source…First draft by Anthony L MichaudFirst draft by Anthony L Michaud
Use the manual!Use the manual! This presentation is NOT a replacement for the manual. Use This presentation is NOT a replacement for the manual. Use
the manual as much as possible! This presentation is the manual as much as possible! This presentation is intended to make it a little easier to see what each part intended to make it a little easier to see what each part looks like and to add to the manual.looks like and to add to the manual.
Schematics for the ion source are provided in section 8 of Schematics for the ion source are provided in section 8 of the manualthe manual
Print out all pages from 8-48 to 8-67Print out all pages from 8-48 to 8-67 Turn off the mass spectrometer first by shutting off the Turn off the mass spectrometer first by shutting off the
pumps using the switches on the instrumentpumps using the switches on the instrument Once you are ready to start work on the instrument, turn off Once you are ready to start work on the instrument, turn off
the mains switch behind the instrument to shut off all the mains switch behind the instrument to shut off all electronics (just ensuring that you don’t get a 10KV zap)electronics (just ensuring that you don’t get a 10KV zap)
Note: if you have other instruments connected to the MAT Note: if you have other instruments connected to the MAT 253 (such as the TC/EA), they should be in a “safe” state 253 (such as the TC/EA), they should be in a “safe” state before shutting off the electronics. If not, then run an before shutting off the electronics. If not, then run an extension cord from the deltaplus over to the device and extension cord from the deltaplus over to the device and connect it temporarily to the deltaplus.connect it temporarily to the deltaplus.
Plan this out!!! Use a clean surface and Plan this out!!! Use a clean surface and draw everything! Write down a step by draw everything! Write down a step by step detailed sequence of what you do!step detailed sequence of what you do!
Step by step detailed account of work
Outline of parts and description
Clean surface for all parts. Can draw on surface. Very nice!
Remove cover platesRemove cover plates Remove the screws Remove the screws
mounting the source mounting the source lead cover in placelead cover in place
These are flat head These are flat head screws, two each screws, two each holding each cover holding each cover half to the source half to the source and two more and two more holding the cover holding the cover pieces togetherpieces together
Remove the cover Remove the cover platesplates The cover plates are The cover plates are
fairly tightly held in fairly tightly held in place. You may need place. You may need to pry them off to pry them off gently with a screw gently with a screw driverdriver
Underneath the Underneath the cover are the source cover are the source leads, each insulated leads, each insulated with a teflon sheetwith a teflon sheet
Remove the leadsRemove the leads
Warning! The mains Warning! The mains should be OFF so should be OFF so that you don’t risk that you don’t risk getting shocked!getting shocked!
Slide the teflon cover Slide the teflon cover off of a leadoff of a lead
Use a 1.5mm allen Use a 1.5mm allen wrench to loosen the wrench to loosen the lead and then slide lead and then slide the lead connector the lead connector off of the source feed off of the source feed through pinthrough pin
Pin identificationPin identification Use the schematic Use the schematic
from page 8-54 of from page 8-54 of the manual to the manual to identify the pinsidentify the pins
Note that the Note that the manual does a manual does a poor job of poor job of identifying these so identifying these so see the next slide see the next slide for detailfor detail
Pin identificationPin identification K+/K-K+/K- pins for the filamentpins for the filament 1: Trap1: Trap 2: Ionization housing (ion box)2: Ionization housing (ion box) 3: extraction plate3: extraction plate 4: empty – nothing connected here4: empty – nothing connected here 5: shield5: shield 6: lens (positioned opposite of the 6: lens (positioned opposite of the
gas inlet)gas inlet) 7: lens (positioned on same side as 7: lens (positioned on same side as
gas inlet)gas inlet) 8: r-delfection8: r-delfection 9: z-deflection (filament side)9: z-deflection (filament side) 10: z-deflection (trap side)10: z-deflection (trap side) 11: einzel lens11: einzel lens 12: einzel lens (double check this)12: einzel lens (double check this) 13: halogen lights13: halogen lights 14: halogen lights14: halogen lights 15: halogen lights15: halogen lights
Removing the sourceRemoving the source Use a 13mm wrench to Use a 13mm wrench to
loosen each bolt on the loosen each bolt on the sourcesource
Loosen bolts in a criss-Loosen bolts in a criss-cross fashioncross fashion
Initially, only loosen each Initially, only loosen each bolt by about 1/8 of a bolt by about 1/8 of a turn so as to evenly turn so as to evenly loosen the entire sourceloosen the entire source
Hint: leave one bolt on Hint: leave one bolt on top and one on bottom top and one on bottom for last so that you can for last so that you can support the source with support the source with one hand while removing one hand while removing these bolts with the these bolts with the otherother
Ion sourceIon source Place the ion source Place the ion source
on the stand (be on the stand (be sure that no weight sure that no weight is put on the is put on the feedthrough pins!!!)feedthrough pins!!!)
Observe the Observe the connections, plates, connections, plates, gas inlet, sulfur gas inlet, sulfur window, etc.window, etc.
Gas inlet
Sulfur windowEinzel lens stack
Magnet over filament
Ion SourceIon Source Note where leads Note where leads
are connect and are connect and what they are what they are connected toconnected to
Magnet over filament
Sulfur windowEinzel lens stack
Gas inlet
Ceramic guide posts
Ion sourceIon source Turn the source Turn the source
and see the other and see the other leadsleads
Gas inlet
Trap side magnet
Einzel lens stack
Halogen bulbs
Steel mounting posts
Ion sourceIon source ObservationsObservations
Sulfur window
Filament side magnet
Trap side magnet
Einzel lens stackEinzel lens
lead
Ionization housing
Exit slit
Ion sourceIon source ObservationsObservations
Gas inlet
Einzel lens stackEinzel lens
lead Einzel lens lead
Trap side magnet
Filament side magnet
Filament leads
Disconnect filamentDisconnect filament Use a flat head screw Use a flat head screw
driver to disconnect driver to disconnect the filament leads the filament leads from the feedthrough from the feedthrough postpost
Then remove screws Then remove screws holding the filament holding the filament magnet in placemagnet in place
Finally, remove Finally, remove screws holding screws holding filament in placefilament in place
Disconnect leadsDisconnect leads Use pliers (small Use pliers (small
ones) to retract ones) to retract each lead from the each lead from the pin it is connected pin it is connected toto
DO NOTDO NOT remove remove leads from the leads from the feedthrough pins feedthrough pins on the source on the source flangeflange
Remove the source Remove the source bodybody After removing all of the After removing all of the
leads, double check that leads, double check that they really are ALL they really are ALL disconnecteddisconnected
Use a larger flat head Use a larger flat head screw driver to remove screw driver to remove the two screws from the the two screws from the steel mounting posts steel mounting posts (sorry, no picture)(sorry, no picture)
Remove the source Remove the source body and place it gently body and place it gently onto a clean work onto a clean work surfacesurface
Remove Einzel lens Remove Einzel lens leadsleads Use the needle Use the needle
nose pliers to nose pliers to remove the leads remove the leads from each einzel from each einzel lenslens
See manual, p 8-See manual, p 8-66, fig 8-1266, fig 8-12
Remove Ground PlatesRemove Ground Plates Remove the 4mm Remove the 4mm
nuts and washers nuts and washers on top of the on top of the einzel lens stackeinzel lens stack
Remove the top Remove the top grounding plates grounding plates (these are (these are stamped “5” on stamped “5” on the side facing the the side facing the ionization housing)ionization housing)
Remove Einzel lensesRemove Einzel lenses Remove the outer Remove the outer
ceramic spacer tubeceramic spacer tube Note that groove in Note that groove in
ceramic spacer is ceramic spacer is facing ionization facing ionization housinghousing
Remove Einzel lenses Remove Einzel lenses (these are stamped (these are stamped “4” on the side “4” on the side facing the ionization facing the ionization housing)housing)
Remove grounding Remove grounding platesplates Remove the second Remove the second
set of ceramics set of ceramics (narrow tube and (narrow tube and shorter wide space)shorter wide space)
Note again that Note again that grooves in ceramics grooves in ceramics are facing ionization are facing ionization housinghousing
Remove the second Remove the second pair of grounding pair of grounding platesplates
Einzel lens stack is Einzel lens stack is now completely now completely removedremoved
Remove magnet and Remove magnet and traptrap Remove the Remove the
magnet covering magnet covering the trap (electron the trap (electron collector)collector)
Remove the trapRemove the trap
Loosen ceramic postsLoosen ceramic posts Note where the ceramic Note where the ceramic
post protrude through post protrude through the top (side opposite the top (side opposite the ionization housing) the ionization housing) of the ion sourceof the ion source
Use a small screw driver Use a small screw driver (if necessary) to loosen (if necessary) to loosen the threaded sleeves on the threaded sleeves on the ceramic posts (these the ceramic posts (these provide tension to hold provide tension to hold pins in the bottom of the pins in the bottom of the posts on the ion box posts on the ion box side)side)
Use pliers to remove the Use pliers to remove the pins in the bottom of the pins in the bottom of the ceramic postsceramic posts
DissasemblyDissasembly Slide the ceramic Slide the ceramic
posts out about 1 posts out about 1 cm at a time in cm at a time in order to order to disassemble the disassemble the ion source piece-ion source piece-wisewise
Put source on its side!Put source on its side! Important Note: The first Important Note: The first
time I took the source time I took the source apart was not the best way apart was not the best way to do it! Do not place the to do it! Do not place the ion source in an upright ion source in an upright position as I did in the top position as I did in the top picture here. There is a picture here. There is a quartz tube that transfers quartz tube that transfers gas from the gas inlet to gas from the gas inlet to the ionization housing and the ionization housing and it is VERY FRAGILE! I it is VERY FRAGILE! I chipped mine by placing chipped mine by placing the source upright. Put the the source upright. Put the source on its sidesource on its side
The steps that follow are The steps that follow are given in the better order given in the better order (not the order I followed (not the order I followed the first time)the first time)
Fragile quartz tube
Remove gas inlet and Remove gas inlet and ion boxion box Remove the post Remove the post
holding the gas holding the gas inletinlet
Retract the fragile Retract the fragile quartz tube from quartz tube from the ionization the ionization housinghousing
Remove the Remove the ionization housingionization housing
Ground plate and Ground plate and quartz spacerquartz spacer Remove the Remove the
cover plate cover plate (stamped “9” on (stamped “9” on the side facing the side facing the ion box)the ion box)
Remove the Remove the narrow quartz narrow quartz spacer ringspacer ring
Extraction plate and Extraction plate and spacerspacer Remove the Remove the
extraction plate extraction plate (stamped “8” on (stamped “8” on side facing ion side facing ion box)box)
Remove the quartz Remove the quartz spacer ring (last spacer ring (last item shown in Fig item shown in Fig 8-10 of manual)8-10 of manual)
Shield and spacerShield and spacer Remove the Remove the
shield (stamped shield (stamped “7” on side “7” on side facing ion box)facing ion box)
Remove quartz Remove quartz spacerspacer
LensesLenses Remove lenses (two Remove lenses (two
have circles)have circles) These are stamped These are stamped
“6” on side facing ion “6” on side facing ion boxbox
Note the orientation Note the orientation of the lead pins on of the lead pins on each lens: one faces each lens: one faces straight out and the straight out and the other is at a 45 other is at a 45 degree angledegree angle
Quartz spacer and r-Quartz spacer and r-deflection platedeflection plate Remove the Remove the
quartz spacerquartz spacer Remove the r-Remove the r-
deflection plate deflection plate (stamped “5” on (stamped “5” on side facing ion side facing ion box)box)
Z-deflection and Z-deflection and ground platesground plates Remove quartz Remove quartz
spacerspacer Remove the Remove the
assembly containing assembly containing ground plates (these ground plates (these are connected by a are connected by a U-shaped lead) and U-shaped lead) and the z-defection platesthe z-defection plates
Disassemble this Disassemble this assembly, take assembly, take pictures, and improve pictures, and improve this slide!this slide!
Remove exit slitRemove exit slit Remove the exit Remove the exit
slit from the slit from the source basesource base
Replace halogen bulbsReplace halogen bulbs Replace the Replace the
halogen bulbshalogen bulbs Note: they are Note: they are
cheap so you cheap so you should replace should replace them even if they them even if they look oklook ok
CleaningCleaning I only use a glass brush to remove all I only use a glass brush to remove all
residues from the lenses. I have not residues from the lenses. I have not cleaned the quartz spacers or ceramics. In cleaned the quartz spacers or ceramics. In general, quartz spacers can be cleaned by general, quartz spacers can be cleaned by sonication in acetone.sonication in acetone.
Be very careful about cleaning the Be very careful about cleaning the ceramics. You should check on isogeochem ceramics. You should check on isogeochem and also with Thermo about heat-and also with Thermo about heat-treatment to clean them if you think it is treatment to clean them if you think it is necessarynecessary
Improve this slideshowImprove this slideshow Upon the next ion source cleaning, Upon the next ion source cleaning,
many pictures should be taken and many pictures should be taken and this slideshow should be improved.this slideshow should be improved.
Add pictures of glass brush useAdd pictures of glass brush use Add pictures showing removal of ion Add pictures showing removal of ion
source from steel mounting postssource from steel mounting posts Add moreAdd more