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Absorber R&D Overview

Absorber R&D Overview. Mary Anne Cummings Mucool ‘02 LBL Oct. 22, 2002. Current projects. New “bellows” window design, manufacture and quality assessment Vacuum window certification tests and FEA comparison

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Absorber R&D Overview

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  1. Absorber R&D Overview Mary Anne Cummings Mucool ‘02 LBL Oct. 22, 2002

  2. Current projects New “bellows” window design, manufacture and quality assessment Vacuum window certification tests and FEA comparison Three-dimensional flow simulations: “force flow” and convection to assess temperature and density uniformity Absorber instrumentation and data acquisition Flow tests: FORCE FLOW: NIU prototype/Black Infrared setup CONVECTION : KEK prototype (non-LH2 cryo) Schlieren/Ronchi tests at ANL MTF (FNAL Linac) area design and cryogenic integration MICE cooling cell design and integration Staging of absorber tests Strain tests of absorber in magnet (ramp up/down/quench)

  3. Near term (< 6 mos, < 1 year) MTF occupancy? Windows (vacuum and absorber) Flow/convection sims. Instr. and data acq Schlieren/Ronchi Flow tests: CONVECTION : FORCE FLOW: MTF (FNAL Linac) MICE Absorber/magnet

  4. LH2 Safety Issues O2/LH2 separation No Ignition sources near LH2 Adequate ventilation Affects: Windows: absorbers and vacuum Primary and secondary vacuum volumes Support structure absorber/focussing coil Instrumentation (experiment and monitors) Cryogenic operation Laboratory area Cooling concerns: Minimizing window thickness/no. of windows Uniform heat maintainance of LH2

  5. Vacuum Windows • Assumption: Design assumes that the beampipe attaches to absorber vacuum windows, therefore vacuum exists on both sides of the windows • Design: • Internal WAMP = 25 psid • External MAWP = 15 psid • FEA showing maximum allowable stress is <2/3 Sy or < 0.4 Su • Material certification • Tests: • Burst test 5 vacuum windows at room temp. to demonstrate a burst pressure of at least 75 psid for all samples. (pressure exerted on interior side of vacuum volume). • Non-destructive tests at room temperature: • External pressure to 25 psid to demonstrate no failures: no creeping, yielding, elastic collapse/buckling or rupture • Other absorber vacuum jacket testing to ensure its integrity FNAL Safety Requirements for Windows

  6. diameter r r Xi R t “Non-standard” thin windows Exploit the structural stability of the spherical cap with a tapered/inflected connection to a solid flange Modified torispherical window(Black/Cummings) “Bellows” inflected window(Black/Lau)

  7. Three dimensional LH2 flow simulations (W. Lau) Flow Tests Schlieren testing of convection flow (water) test at ANL • Nozzle arrangement • Heat application • Cryo tests Testing 3-dimensional simulations with water flow test at NIU

  8. LH2 absorber flow Our challenge: Large heat deposition and beam path is through entire volume of absorber! 1. Liquid must move everywhere, particularly inside 2. Need gauge of temperature and density uniformity 3. Research: Schlieren: measure parameters for CFD calibration Flow sims: predictions for temperature and flow speed and patterns Flow tests: (a) confirm sim predictions (b) instrumentation determination Huge LH2 volumes, low heat deposition: Bubble chambers Small LH2 volumes, low heat deposition: FNAL E866 …here density fluctuations are an issue: Medium volumes, large heat deposition: Sample, Slac E158

  9. LH2 flow issues… What computations are helpful? Ans: Temperature, speed, and geometry – these can help fine-tune the operation of the cryogenic system, particularly for the force-flow designs. Are flow/convection predictions “linear”? Ans: Wing Lau has found the “correct” simulation programs, where “buoyancy” (gravity) is properly handled. What tests will be useful, and how quantitative can they be? Ans: test manifolds that can measure direct simulation predictions – simple at first! Schlieren tests will give independent parameter determination for convection models. What level of instrumentation will convince us of sufficient temperature uniformity? Ans: this will be found out as we do the tests. 5. How will convection and force-flow models be evaluated? Ans: perfect physics projects for students!

  10. Infrared flow test setup

  11. Comments on Mucool LH2 R & D We have an established window design/manufacture/certification program, independent of any other LH2 developments or non-developments We have developed new applications for photogrammetry (NIM article(s) and master’s degree in progress!) Several projects have developed from LH2 absorber concerns, ideal for university and student participation. The first three points means that we can survive as a program current delays in the FNAL MTF construction – but not indefinitely. LH2 flow and heat conduction has now become the dominant physics concern for the absorber. The two flow designs will be pursued in parallel, and independently. LH2 safety is the dominant engineering concern for the cooling cell (at the moment), but there has not yet been any show-stopping problems. Early collaboration with FNAL safety has actually helped in the design of both MTF and MICE projects. Imminent FNAL decisions (i.e., Oct. 28th construction bid decision)and near-term budgets will decide the next year’s schedule

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