Mu2e Muon Beamline Vacuum Overview Dave Pushka Mu2e Muon Beamline Vacuum Level 3 Manager 9 Feb 2017
Outline of Items Covered in this Review Presentation: • Orientation – Key Requirements – Overview of the Geography of the Production Solenoid (PS) and Detector Solenoid (DS) and the Transport Solenoid (TSu and TSd) – Piping and Instrumentation Diagram (P&ID) • Outgassing Methodology & Gas Load Summations for upstream muon beamline vacuum volume and downstream muon beamline vacuum volumes – Pie Charts of Gas Loads for upstream and downstream volumes – What is missing from the Outgassing Summation? • Hand Calculations for upstream and downstream muon beamline vacuum volumes • MOLFLO+ methodology – MOLFLO+ Results for the Upstream MB vacuum volume (a.k.a PS + TSu) – MOLFLO+ Results for the Downstream MB vacuum volume (a.k.a TSd + DS) • Interfaces and Physical Equipment Arrangement (locations of vacuum pumps). • Schedule Slide • Initial Evacuation – Simultaneous Initial Evacuation of the upstream and downstream MB vacuum volumes • Contamination and Diffusion Pump Oil • Vessels and Safety Conformance • Thin Windows • Interlocks, FEMA • Repressurization • Back-Up Material (FEM Risk Assessment, Key Outgassing Rates, Catalog Cuts, Performance Curves) 2 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Requirement Document and Summary of the Requirements: • Mu2e docdb document 1481 provides the requirements for the muon beam line vacuum, which include the key items: • Required pressure levesl: PS + TSu (Upstream); ≤1 x 10 -5 torr. – TSd + DS (Downstream); ≤1 x 10 -4 torr (assuming the tracker and calorimeter achieve their gas load – requirements) • Required vacuum pump down time: – ~ 100 hours. • Required pre-operational cleanliness: – standard high vacuum cleaning and degreasing. • Required operational cleanliness: – minimize, but not eliminate vacuum pump oil back-streaming. 3 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Over View of the Geography: Downstream Vacuum Mu2e 0,0,0 & pbar window Upstream Vacuum Downstream Upstream Vacuum vacuum Pumps pumps 4 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Over View of the Geography: 5 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Hardware Deliverables for Muon Beamline Vacuum: Mechanical Roughing & Backing Pump Vacuum By-Pass Line Production Solenoid End Cap And High Vacuum Pump out Line Mechanical Roughing & Backing Pump Vacuum Pump Spool Piece, VPSP Instrumentation Feed Through Bulkhead, IFB 6 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Context Material - Mu2e & Past Large Vacuum Experience: Mu2e Verses Previous Systems Goal Actual Material Year Vol Vol Pressure Pressure ft 3 liters torr torr KTeV 1994 5,500 155,742 1 x 10 -4 1 x 10 -6 painted C.S. NuMI Decay Pipe 2004 73,467 2,120,575 1 torr < 1 torr Rusty primed C. S. Mu2e PS 2020 424 11,993 1 x 10 -5 TBD 316L Mu2e DS 2020 1,321 37,378 1 x 10 -4 TBD 316L Grumman BSTS 1990 2,674 75,705 2 x 10 -7 6 x 10 -8 304 White Sands 1987 65,450 1,853,330 2 x 10 -6 8 x 10 -7 304 7 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Details of the View of the Areas in the Upstream (PS+TSu): Pump out Line Bore PS-TS and TS-TS COL 1 and 3u Interface Area 8 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Details of the View of the Areas in the Downstream (TSd+DS) Vacuum Volume: Tracker, Calorimeter, Absorbers not Muon Beam Stop shown, but estimates of gas loads are used in MOLFLO+ model Detector Solenoid VPSP IFB Col 5 TSd Col3 9 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Piping And Instrumentation Diagram (P&ID) from 6489: 10 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Outgassing and Vacuum Calculation Methodology: • Sum up the surface areas exposed to muon beamline vacuum • Assign material (SS, Al, Ti, W, fiberglass tape, etc) • Estimate temperature. • Assign outgassing rate for temperature at time = 1hour, 10 hours, etc. – Using achievable surface conditions – For example, the HRS is not likely to be ultra sonically washed, dried, baked and never touched by human hands again • Calculate gas load, Q = outgassing rate * area for various times • Determine pressure ignoring geometry (1 large volume) P=Q/S • Assign Outgassing to model in MOLFLO+ such that the total gas load matches the sum of the Area* Outgassing Rate for the real volume. – MOLFLO+ Surface areas are smaller than actual areas, but cross sectional areas are very similar. • Determine pressure as a function of location. 11 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Outgassing Gas Load Values: • Have reasonable outgassing numbers for everything in the PS+TSu. • Have reasonable outgassing numbers for surfaces and materials in the TSd+DS with the except of the Tracker and Calorimeter and the associated cabling and services. – For the tracker, the requirement on the gas load is ≤0.08 torr-l/s, and that is the value adopted for this analysis • Solid Model for Tracker is available and has been checked w.r.t. the requirement document values – For the calorimeter, an estimate of the outgassing load has been extracted based upon the surface area and materials expected in the calorimeter • The details of the calorimeter are still being refined • The long term gas load of the calorimeter is required to be negligible compared to the tracker gas load requirement of ≤0.08 torr-l/s • Outgassing rates come from literature (Elsey, Dayton, Santler, etc.) See the next few slides: 12 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
Outgassing Summations for the Upstream Volume (Spread sheet on docdb document 6470): contributes to Outgassing 10 hour 10 hour gas PS Vacuum: outgassing Area temperature material outgassing rate load PS DP Tee Section Y 17,866 25 316L 2.10E-08 3.75E-04 24 inch vacuum pipe: Y 48,192 25 316L 2.10E-08 1.01E-03 end cap truncated cone Y 55,824 35 316L 2.10E-08 1.17E-03 end cap vacuum pumpout nozzle Y 6,004 35 316L 2.10E-08 1.26E-04 End cap head Y 44,887 40 316L 2.10E-08 9.43E-04 end cap center port truncated cone Y 11,732 60 316L 2.10E-08 2.46E-04 end cap center port cylinder Y 4,775 60 316L 2.10E-08 1.00E-04 end cap beam exit nozzle Y 7,388 60 316L 2.10E-08 1.55E-04 end cap extinction nozzle Y 3,234 60 316L 2.10E-08 6.79E-05 Center Port Window Y 2,027 60 Ti 4.00E-09 8.11E-06 Beam Exit Window Y 507 60 Ti 4.00E-09 2.03E-06 Extinction Window Y 182 60 Ti 4.00E-09 7.30E-07 Primary beam entrance window by PS Y HRS cone Y 38,022 50 316L 2.10E-08 7.98E-04 HRS bore Y 31,233 60 316L 2.10E-08 6.56E-04 target Y 59 1500 W 2.00E-07 1.19E-05 target support ring Y 911 60 Al 1.10E-07 1.00E-04 target support wires Y 57 600 W 1.00E-07 5.65E-06 primary beam pipe in HRS Y 4,907 30 316L 2.10E-08 1.03E-04 primary beam pipe in TSU Y 6,193 30 316L 2.10E-08 1.30E-04 antiproton absorber Y 1,924 30 Al 1.10E-07 2.12E-04 HRS d.s. end Y 15,088 30 316L 2.10E-08 3.17E-04 HRS d.s. single convolute bellow Y 16,198 30 316L 2.10E-08 3.40E-04 HRS bellow radial plate Y 4,398 30 316L 2.10E-08 9.24E-05 P.S. d.s. end in vacuum Y 8,233 30 316L 2.10E-08 1.73E-04 PS d.s. end to bellows horz cyl Y 14,019 30 316L 2.10E-08 2.94E-04 13 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017 PS to Tsu bellows Y 61,928 30 316L 2.10E-08 1.30E-03 TSU u.s. ring from bellows Y 5,341 30 316L 2.10E-08 1.12E-04
Outgassing Summations for the Downstream Volume (Spread sheet on docdb document 6470): 10 hour Contributes Outgassing outgassing 10 hour gas DS Vacuum: to Outgassing Area rate load temperature material cm^2 C torr-liters /s-cm2 torr-liters/s IFB shell, F10017417 Y 32,288 30 316L 2.10E-08 6.78E-04 VPSP, F10034792 Y 130,473 30 316L 2.10E-08 2.74E-03 VPSP rails Y 8,704 30 316L 2.10E-08 1.83E-04 VPSP D.S. Face at IFB Y 1,912 30 316L 2.10E-08 4.01E-05 DS Stub extension, FC0043184 Y 7,282 30 316L 2.10E-08 1.53E-04 DS Inner wall, F10005007 Y 645,849 30 316L 2.10E-08 1.36E-02 Bellows Closure Ring Y 3,809 30 316L 2.10E-08 8.00E-05 TSd - DS Bellow Y 60,479 30 316L 2.10E-08 1.27E-03 TSd O.D at DS Y 57,540 30 316L 2.10E-08 1.21E-03 TSd D.S. Face Y 18,776 30 316L 2.10E-08 3.94E-04 TSd Bore Y 106,725 30 316L 2.10E-08 2.24E-03 TSd Vertical U.S. Face Y 18,568 30 316L 2.10E-08 3.90E-04 TSd Bellows at COL3b Y 60,569 30 316L 2.10E-08 1.27E-03 TSd Bellows closure ring at COL3b Y 5,520 30 316L 2.10E-08 1.16E-04 TSd O.D at COL 3 Y 16,293 30 316L 2.10E-08 3.42E-04 Col 3b (assume = Col 3a from PS) 14 Dave Pushka | Muon Beamline Vacuum Overview Feb 9, 2017
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