1. David Johnson Diagnostics Team Leader
US ITER Diagnostics
David Johnson
Diagnostics Team Leader
Good Morning, my name is David Johnson and my presentation covers plans for US ITER diagnostics.
November 15, 2006
US ITER Project
Vendor Fair
Oak Ridge, TN

2. Outline 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.

3. US 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.

4. Scope - 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 Panels
and Back Boxes (L8)
Plugs provide
Vacuum seal, radiation shielding
Cooling water and support for blanket shield modules
Support and access for diagnostics
Plugs consist of
Generic structural components common to all of that type
Custom diagnostic shield modules
Part 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.

5. Upper Visible/IR Cameras (6 in upper ports)
Within Cryostat
Outside Cryostat
Endoscope heads (aspheric)
Metal mirrors
Shutters and actuators
Refractive optics
Visible and IR optics
High resolution visible and IR cameras
Fast visible and IR cameras
Image capture and analysis software

6. Main Plasma Reflectometer (LFS)
Differential movements taken up in waveguide joints
Within Cryostat
Outside Cryostat
Horn antenna/tapers
Vacuum-compatible corrugated waveguide
Compliant WG mitre-bends, sleeves
Microwave test equipment
Standard aluminum corrugated waveguide
wave sources (~100 mW, 30 GHz BW, GHz)
Tracking LOs, mixer/detectors
IF amplifiers and components, video amplifiers
Digital controllers, digitizers, D/As, computers

7. Electron Cyclotron Emission Diagnostic
Within Cryostat
Outside Cryostat
Ellipsoidal metal mirrors
Vacuum-compatible corrugated waveguide
Compliant WG miter-bends, sleeves
In-situ hot calibration sources, shutters
Standard aluminum corrugated waveguide
Mitre-bends, polarization splitters
Multichannel (40-50) radiometers ( GHz)
Michelson interferometers ( GHz)

8. Motional Stark Effect Polarimeter
Within Cryostat
Outside Cryostat
Metal aspheric mirrors
Shutters and actuators
In-situ calibration sources
In-situ mirror cleaning system
Fiber optic bundles (in heating jacket)
Photoelastic modulators
High-resolution spectrometers
Narrow-band spectral filters
APD detectors, preamps, digitizers
Plan view of edge MSE sightlines Port E3
Heating Beam

9. Toroidal Interferometer/Polarimeter
Within Cryostat
Outside Cryostat
Metal mirror-based beam delivery optics
Shutter and actuator
Metal retroreflectors
Real-time beam alignment system
Two-color lasers in IR/FIR
IR/FIR detectors, polarization modulators
IR/FIR optics (beam splitters, wave plates, etc)

10. Divertor Interferometer
Within Cryostat
Outside Cryostat
Mirror-based beam delivery optics
IR/FIR waveguide?
Metal retroreflectors?
Real-time beam alignment system
Two color lasers in IR/FIR
IR/FIR detectors, modulators
IR/FIR optics (beam splitters, wave plates, etc)

11. Residual Gas Analyzers
Within Cryostat
Outside Cryostat
RGA sensor heads with radiation-hardened electronics, magnetic shields
Penning gauges with optical fiber and high-resolution spectrometers, optical detectors
Turbomolecular pumps, vacuum components, calibrated leaks
Pumping duct
(1 of 4)

12. Schedule/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.