Target Summary/Status Chris Densham STFC/ RAL Mu2e Target, Remote - - PowerPoint PPT Presentation

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Target Summary/Status Chris Densham STFC/ RAL Mu2e Target, Remote - - PowerPoint PPT Presentation

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Target Summary/Status Chris Densham STFC/ RAL Mu2e Target, Remote Handling, and Heat & Radiation Shield Review Nov 16-18 2015 1 Schedule for Target Program ID Task Name 2015 2016 M A M J J A S O N D J F M A M J J A S

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Target Summary/Status

Chris Densham STFC/RAL

Mu2e Target, Remote Handling, and Heat & Radiation Shield Review Nov 16-18 2015

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Schedule for Target Program

ID Task Name 1 2 3rd RAL Mu2e contract 3 Contract 3 phase 1 ‐ Emisivity and surface characterisation studies 4 Negotiate specification & contract 5 Contract start date 6 Characterise W surface finish vs emissivity 7 Test rig mods for energy balance measurements 8 DC sample heating test ‐ Proof of principle for sample diameter 9 Optimisation of sample on DC heating test 10 Characterisation & testing ‐ calibration of instruments 11 Emisivity measurements of bare W in energy balance rig 2015 2016 M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N Geoff,Peter,Rig[1] 12 Post‐test characterisation 13 Manufacture energy balance sample 14 Coat energy balance sample 15 Measure emisivity of coated sample 16 Continuation of fatigue life testing 17 Continuation of target condition tests 18 Test to faiture under extreme conditions 19 Post test evaluation 20 Shaped sample manufacture 21 Post EDM treatments 22 Piston head sample/further coating 23 re‐configure rig for fatigue testing 24 Shaped sample pulse tests 25 W surface & coating R&D 26 Laser‐etch finned test rods 27 Etching rods 28 Emissivity measurement (optical method) 29 SiC coating 30 CVD coating of samples 31 TGA oxidation tests 32 Adhesion/bonding/sectioning tests 33 emisivity measurement of Si coated sample (optical method) 34 Thermal cycling of SiC coated tube sample (0‐1500°C) Steve[75%] Steve Peter,Rig[1] Peter[50%],Rig[1] 35 Long bakeout of SiC coated tube sample 36 Pulsed testing at elevated temperature ‐ SiC tube sample 37 Oxidisation tests 38 Source 'little wire' samples 39 SiC coat wire samples 40 'Little wire'/oxidation tests ‐ bare W 41 'Little wire'/oxidisation tests ‐ si coated W 42 SiC sectioning 43 Decision on radiation cooled target feasibility and spec. coating/surface 44 decision on cooling technology made 45 1st intermediate report 46 Meeting attendance 47 Start contract 3 phase 2 48 Contract 3 phase 2 ‐ Creep testing and thermal optimisation 49 Alternative coating testing 50 Consider alternative coating materials 51 Carry out oxidisation tests on iridium samples 52 Pulsed sag testing of shaped sample in Horiz. Config. 53 Simulations of bending stress (sample vs target) 54 Manuf new shaped sample 55 Redesign rig for horiz simple support contacts 56 Manuf new parts for rig 57 Reconfigure rig 58 Carry out sag test program 59 Presentations ‐ summarise progress 60 review ‐ Fermilab 61 High T creep testing of taret components 62 Target sag test 63 Design test rig and samples 64 Manufacture rig components 65 Manufacture test sample targets 66 Sag test W 67 Sag test Lathanum doped W 68 spoke creep test 69 Design spoke creep rig and test samples 70 Manufacture rig components 71 Manufacture spoke sampes (W,Ta, LdopedW) 72 Creep test of Tantalum 73 Creep test of W 74 Creep test of Lathanum doped W 75 Elevated T creep testing of springs 76 Design creep test samples 77 Manufacture test springs 78 Creep test of various spring materials 79 Optimisation of target end joints 80 Design & analysis 81 Prototyping 82 He cooling study and outline plant spec 83 2nd intermediate report 84 Decision on design principles 85 Meeting attendance Otto 10/08 28/08 Peter PDF lab Geoff Geoff[50%],Workshop[50%] Geoff,Rig[1] Rig[1],Peter[8%] PDF lab[33%]

Contract 3 Phase 1

Design & Test

Contract 3 Phase 2 Design & Test

Emissivity measurements Pulsed lifetime test Silicon-Carbide coatings Vacuum/leak test Helium cooled target concept Intermediate report Alternative coating technology Creep/sag tests Creep/sag tests Prototype springs Optimise + prototype target mount system Final Report

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Target Research Status (I)

  •  Emissivity measurements for tungsten

– Operating temperature determined for plain target at 7.7 kW beam power ✔ – Micro-fins enhance emissivity (lower T) but questions over fatigue life ✔

  •  High T pulsed fatigue performance of tungsten test samples

– Sufficient for > 1 year lifetime ✔ – Encouraging data at increased pulse intensity

  •  Sag/creep tests

– Tests underway – Available data does not cause concern – If there is a problem, design can be modified e.g. support from Airy points

  •  Radiation damage of tungsten – high DPA rate, He, H2 production

– c.10x faster rate than in ISIS targets, higher T may be better due to high diffusion

  •  ‘Bicycle’ wheel target concept

– Simple installation into HRS/ easy remote handling ✔ – Spoke manufacture ✔ – Spoke tensioning system (2 options) ✔

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Target Research Status (II)

  •  Operating conditions of radiation cooled target vs requirements

– Vacuum level of 1e-5 torr expected by vacuum group – Vacuum level of 1e-6 mbar known to result in minimal tungsten oxidation – Uncertainty on target lifetime for actual operating conditions

  •  Oxidation -> contamination of HRS
  •   Target coating to mitigate oxidation

–  SiC: strong, high emissivity coating (lower T), performs well at 1e-7 mbar

  •  Coating rapidly degrades at 1e-4 mbar, not suitable as anti-oxidation

coating –  Ir coating: much less reactive than W at high temperatures

  • few µm layer achieved by sputter coating
  • c.100 µm required for evaporation/diffusion tolerance

– CVD being investigated, promising

  •  Backup options: convective cooling to eliminate oxidation

– Water or helium feasible – ‘Back door’ kept open to incorporate cooling system

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Helium cooled target

proton beam : 8GeV 8kW 1mm sigma heat load = 588W helium mass flow = 1g/s max helium velocity = 356m/s pressure drop = 0.2bar max tungsten temperature = 368°C temperature variation per pulse = 58°C max von Mises stress = 10MPa stress fluctuation = 6MPa

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Target research status (III) Convectively cooled back-up

Radiation cooled Water cooled Helium cooled Material Tungsten Graphite (low yield) Gold Ta clad tungsten Tungsten Physics (yield)   c.5% pion loss  c.1% pion loss Chemistry  High temperature, poor vacuum  Some chemistry (W/H2O)  No chemistry Operating temperature High  W properties  Graphite Low  W properties  Au properties Low  W properties Ease of remote handling   Water connections, pipes  Helium connections, pipes Plant issues  None  Known tech.  Complexity, price Diagnostics  None? ΔT, activity ΔT, activity Contamination /activation  Ox. in poor vacuum  OK in good vacuum  Water activation  Issues with leaks  Low activation  Low leak concerns Experience, data  Little data Data on Ta clad W  Little gold data  Data on pure W Upgradeability  No  Yes  Yes

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Radiation cooled target schedule (2 year float)

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Radiation cooled target schedule (2 year float)

Contract 4

Full Target Prototype

Contract 5

Manufacture 1st Production Target

Detail Design Manufacture Prototype Target Intermediate Report Thermal Testing of prototype Final Report Manufacture And Assemble Parts Ship to FNAL

Mid FY 2018