Lecture 3 slides - California Institute of...
Transcript of Lecture 3 slides - California Institute of...
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VacuumPart2.ItStillSucks…
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CalculatingConductance
• aisradius(ID)• Fo isfororifice,Ft isfortube
• L/aisratiooflength/radius(ID)
• Divideby2foreachright-anglebend
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VacuumMaterials
• Stainlesstype304• Aluminum(notanodized)
• Pyrex• Vitono-rings
• NOPLASTIC!!!
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Quick-releaseflanges• Quickflange(QF)• Kleinflange(KF;morecommon?)
• AlsoNWorDN
• NamesbasedoninternaldiameterDN16KFis16mm(16-50mm)
• Limitedto120C,10-8 mbar
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Sizeswewilllikelyfind.
www.vacuumresearchcorp.com/pdfs/valves/nwflanges06.pdf
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Largeflangestandard
• TypicallydesignatedISO,LF,orMF
• Boltedorclamped• O-ringorknife-edgeseal
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ISOflangedimensions
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Conflat flanges
• Oftendesignated‘CF’• Cugasket,knife-edgesealsonflanges
• BestchoiceforUHV
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Feedthroughs
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MechanicalPressureGauges
Manometer Anaeroid
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MechanicalPressureGauges
BourdonTubeCapacitancemanometer(diaphragm gauge)
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ThermalConductivityPressure Gauges
ThermocoupleGauge Pirani Gauge
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IonizationGauges
Hotfilamentgauge Coldcathodegauge
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Comparisonofgaugetypes