19 Jun 03 1
Lamberston Removal and F0 Straight Section Vacuum Upgrade
Mike McGee
FNAL
19 Jun 03 2
Staging Magnet Mover
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a
19 Jun 03 3
Lambertson #2 Removal with Magnet Mover
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a
19 Jun 03 4
F0 Vacuum Upgrade
• Replacement of A150, P150, P1, Tev US and Tev DS spool sections
• 3” and 4” diameter Electro-polished, H2 degassed beam tube
• Addition of Differential Pumping to limit conventional beamline gas loads
• Addition of TSP in Tevatron Spool sections (must maintain 1e-9 Torr to be effective)
19 Jun 03 5
Differential Pumping
• Gas load of A150, P150 and P1 lines are greater than Lamberston gas load (must also consider MI-60 liner test results)
• Q(A150) = 5.76e-6 Torr*liter/(sec*cm^2)• Q(P150) = 3.96e-6 Torr*liter/(sec*cm^2)• Q(P1) = 4.68e-6 Torr*liter/(sec*cm^2)• Q(Lam) = 5.28e-6 Torr*liter/(sec*cm^2)• Factor of 2 improvement• Q(Lam w/ liner) = ?
19 Jun 03 6
TSP Design
TSP (Titanium Sublimation Pump)cf 0.0254 m/in
Conductance Under molecular flow L > 10*IDID 0.097384 m Tube inner diameter (4" OD tee)T 300 K Temperature of moleculesL 0.0635 m Length of tube section (along tee)M 2.02 gm/mole Molecular weight of H2Ci 0.675295 liters/sec Aperture conductance per cm^2 for gas species "i"Alphai --- Sticking coefficient for gas species "i"Ac 952.7 cm^2 Equivalent surface area
Surface Pump SpeedSpecies "i"H2 CH4 CO O2 H2O CO2Alpham 0.05 0.0009 0.85 0.95 0 0Alphai 0.01 0 -0.15 -0.15 0.5 0.5Ac 952.7 952.7 952.7 952.7 952.7 952.7 cm^2C 0.675295 0.675295 0.675295 0.675295 0.675295 0.675295 liters/sec
Ss 6.433478 0.579013 96.50216 96.50216 321.6739 321.6739 liters/sec
TSP will remove CO, H2O, but not CH4. Ti needs to cover only 5 monolayers. Must use Varian Starcell in conjunction w/ TSP to pump noble gases
8" d iameter tube
4" d iameter tube tee
TSP C artridge
Var ian Ti Filaments
19 Jun 03 7
A150 Line Vacuum Upgrade
300 l/s
Multiwire
300 l/s
2.5 m
Current F0 Lambertson (DS) A-150 Line
F0 Lambertson (DS) A-150 Line
300 l/s
20 l/s
7.595 m
Multiwire
4.098 m
19 Jun 03 8
P150 Line Vacuum Upgrade4.839 m
500 l/s
1.25 m
Current F0 Lambertson (US) P-150 Line
500 l/s
1.25 m
500 l/s
F0 Lambertson (US) P-150 Line
19 Jun 03 9
P1 Line Vacuum Upgrade
2.5 m
F0 Lambertson (DS) P1 Lin e 300 l/s 300 l/s
Current F0 Lambertson (DS) P1 Line
7.849 m
300 l/s
2.5 m
Multiwire
19 Jun 03 10
Tevatron Us and DS Vacuum Upgrade
25 l/s
25 l/s
F0 Lambertson (US) Tev
F0 Lambertson DS Tev
7.425 m
5.959 m
25 l/s
19 Jun 03 11
Virtual Leak of Liner
• Lamination cracks should be < 1% of entire exposed surface area (Dave Harding)
• Perforated area 2.5% of entire liner surface area (Alex Chen)
• MI-60 Testing
19 Jun 03 12
CuBe Liner Vacuum Prep
• Cleaning Distilled water heated to 110 F and ultrasonic bath
Distilled water and Citranox (1%) ultrasonic bath
(PH 8-9)
Dry with alcohol and nitrogen
• Pre-bake• Vacuum testing at MI-60 (RGA)• In stu bake with entire F0 vacuum upgrade
19 Jun 03 13
Future Considerations
• Use of 3” diameter beam tube contingent on aperture studies
• Complete vacuum system review mid July after liner vacuum testing
• Consider Multiwire gas load on vacuum system