Presentation on theme: "David Johnson Diagnostics Team Leader"— Presentation transcript:
1David Johnson Diagnostics Team Leader US ITER DiagnosticsDavid JohnsonDiagnostics Team LeaderGood Morning, my name is David Johnson and my presentation covers plans for US ITER diagnostics.November 15, 2006US ITER ProjectVendor FairOak Ridge, TN
2Outline US Scope Port Plugs Instruments Schedule In a little over a decade, when we have succeeded in building and testing this device, diagnostics will be our window into what we have created. Our views will come through the components like those shown in blue and green in this picture. Compared to our previous experience, these front-end components are in a unique environment. First they are deeply embedded in a massive shield plug, shown here in red. This plug will weigh ~ 50T, and removal for maintenance will be difficult, raising the standard for reliability of the front-ends.. Components near the plasma will be subject to much more intense radiation, more erosion from neutral particle bombardment, more deposition from ablated wall material and more nuclear heating than we have ever had to deal with before. Experts in the US are excited about meeting these challenges and bringing the US forward in this important burning plasma technology. I plan to briefly tell you about the US scope in diagnostics, our cost estimates and the schedule drivers. I will then tell you about our procurement plan and our near-term plans for minimizing cost and risk and then I’ll summarize with key issues.
3US Diagnostic Packages This is the way we have organized the US diagnostics scope. First it includes these seven instruments. There are two visible systems, the cameras and the motional Stark effect system; the electron cyclotron and reflectometer systems are microwave systems, and the two interferometers are likely to be IR or FIR systems. The front-end components from these six systems reside in plugs - often plugs provided by other parties. The residual gas analyzers are not embedded in plugs. As mentioned earlier, in addition to the instruments, the US will provide 5 port plugs. All of this hardware is at a conceptual level of design.Design maturity is conceptual.
4Scope - US Port Plugs Upper Plugs (U5, U17) Equatorial Plugs (E3, E9) (4.5m long, ~25T in-vessel)Equatorial Plugs (E3, E9)(2.2m high, ~50T in-vessel)Divertor Side Panelsand Back Boxes (L8)Plugs provideVacuum seal, radiation shieldingCooling water and support for blanket shield modulesSupport and access for diagnosticsPlugs consist ofGeneric structural components common to all of that typeCustom diagnostic shield modulesPart of the US scope is to provide 5 port plugs. The plugs serve several purposes. They seal the vessel; they shield the magnets and the rest of the facility from radiation, they provide support and cooling water to the blanket shield modules which face the plasma, and finally, they provide access for the diagnostics.. They are large structures. For just the in-vessel parts, the size scales and weights are shown here. The upper and equatorial plugs consist of a generic box-like structure cantilevered off the vacuum flanges. Diagnostics are housed in custom, removable shield modules shown here and here.
5Upper Visible/IR Cameras (6 in upper ports) Within CryostatOutside CryostatEndoscope heads (aspheric)Metal mirrorsShutters and actuatorsRefractive opticsVisible and IR opticsHigh resolution visible and IR camerasFast visible and IR camerasImage capture and analysis software
6Main Plasma Reflectometer (LFS) Differential movements taken up in waveguide jointsWithin CryostatOutside CryostatHorn antenna/tapersVacuum-compatible corrugated waveguideCompliant WG mitre-bends, sleevesMicrowave test equipmentStandard aluminum corrugated waveguidewave sources (~100 mW, 30 GHz BW, GHz)Tracking LOs, mixer/detectorsIF amplifiers and components, video amplifiersDigital controllers, digitizers, D/As, computers
7Electron Cyclotron Emission Diagnostic Within CryostatOutside CryostatEllipsoidal metal mirrorsVacuum-compatible corrugated waveguideCompliant WG miter-bends, sleevesIn-situ hot calibration sources, shuttersStandard aluminum corrugated waveguideMitre-bends, polarization splittersMultichannel (40-50) radiometers ( GHz)Michelson interferometers ( GHz)
8Motional Stark Effect Polarimeter Within CryostatOutside CryostatMetal aspheric mirrorsShutters and actuatorsIn-situ calibration sourcesIn-situ mirror cleaning systemFiber optic bundles (in heating jacket)Photoelastic modulatorsHigh-resolution spectrometersNarrow-band spectral filtersAPD detectors, preamps, digitizersPlan view of edge MSE sightlines Port E3Heating Beam
9Toroidal Interferometer/Polarimeter Within CryostatOutside CryostatMetal mirror-based beam delivery opticsShutter and actuatorMetal retroreflectorsReal-time beam alignment systemTwo-color lasers in IR/FIRIR/FIR detectors, polarization modulatorsIR/FIR optics (beam splitters, wave plates, etc)
10Divertor Interferometer Within CryostatOutside CryostatMirror-based beam delivery opticsIR/FIR waveguide?Metal retroreflectors?Real-time beam alignment systemTwo color lasers in IR/FIRIR/FIR detectors, modulatorsIR/FIR optics (beam splitters, wave plates, etc)
11Residual Gas Analyzers Within CryostatOutside CryostatRGA sensor heads with radiation-hardened electronics, magnetic shieldsPenning gauges with optical fiber and high-resolution spectrometers, optical detectorsTurbomolecular pumps, vacuum components, calibrated leaksPumping duct(1 of 4)
12Schedule/Responsibilities A prerequisite for major diagnostic design effort is the renegotiation of the PP’s to resolve existing scope ambiguities and clarify stakeholder roles/responsibilities and permitting detailed design to begin.In the present plan, most procurements would be made during the fabrication phase from FY10 - FY12.As partner lab responsible for diagnostics, PPPL will subcontract with other experienced institutions to provide the instruments.PPPL will design the port plugs, will integrate the ‘front-ends’ from multiple systems, and will oversee the fabrication, assembly and testing of the plugs.To understand the schedule drivers for diagnostics, it is useful remember the way I broke up the instruments between front-end and ex-crystat components, and the plugs between diagnostic modules and generic structure. We are presently engaged in a series of assessment studies for the instruments, that I will describe In the breakout, and in a multiparty port engineering task force. A prerequisite for major diagnostic effort is the renegotiation of the procurement packages, to clarify scope and responsibilities. Since so much hinges on the front-end designs, completion and endorsement of the front-end integration design can allow many parallel design efforts to enter the detailed phase. Finally, although the high-level integrated project schedule calls for the plug installation in late 2014, a more detailed plan may feature a more phased plug delivery schedule which is not yet defined. If this is phased back a couple of years, there could be significant schedule squeeze. The number and location of plug test facilities will also impact the delivery dates for qualified plugs.