# Presentation: 659943

## Proposed US Role in ITER DiagnosticsDavid Johnson, PPPL

- April 22, 2004

## Defining US Role in ITER DiagnosticsHighlights of the Last Year

- Opportunities for US Diagnostic Participation in ITER - A White Paper to the Department of Energy  (Réjean Boivin)  May 2003 Gave preliminary assessments of “interest” high, medium, low, fractional
- ITER Forum Presentation and discussion on Diagnostic Opportunities on ITER - (D. Johnson) - May 8-9, 2003
- US assessment of cost of ITER diagnostics (PPPL, LLNL, GA)
- At the ITER NSSG-10 meeting held 23 September, the US share of ITER diagnostics was agreed in global terms to be ~15%.
- ITER Diagnostics Working Group was formed to consider repackaging of diagnostics into port-based packages and formulate a proposal for party sharing of diagnostics.
- An assessment of US preferences for diagnostics was done by a group of US experts.
- A prioritized preference list was supplied to the DWG in mid-January.
- The DWG arrived at a sharing proposal and it has been approved by the PT and IT leaders.  Forwarded to Negotiators for final approval.

- April 22, 2004

## Party Allocations for Diagnostics

- At the ITER NSSG-10 meeting held 23 September, the cost sharing for diagnostics was agreed in global terms:
- EU / JA = 20% (host) or 15% (non-host) + 5% flexibility
- US = 15%
- RF = 13%                   TOTAL = 100%
- CN = KO = 4%
- FUND = 24%

- April 22, 2004

## Assessment Criteria

- April 22, 2004

## Assessment Criteria (2)

- April 22, 2004

## Rating ITER Diagnostics

-  The package consisting of
-  descriptions of 20 ITER diagnostics where US    had significant interest
-  listing of the assessment criteria
-  instructions on rating distribution
-  rating ‘scorecard’
- was sent to:
-  Steve Allen (LLNL)	        Dmitri Mossessian (MIT)
-  Réjean Boivin (GA) 	        Tony Peebles (UCLA)
-  Don Hillis (ORNL)	         Glen Wurden (LANL)
-  David Johnson (PPPL) 	Jim Terry (MIT)
-  George McKee (U. Wisc.)	Ken Young (PPPL)

- April 22, 2004

## Slide 7

- April 22, 2004

## US Preferences Supplied to DWG

**US Preferences Supplied to DWG**

- April 22, 2004

## Proposed US ITER Diagnostic Packages

**Proposed US ITER Diagnostic Packages**

- This set of diagnostics provides a reasonable balance in:
- Physics areas addressed
- Plasma regions probed
- US capabilities utilized
- Level of risk confronted
- Diagnostic ‘real estate’ integrated

- April 22, 2004

## Electron Cyclotron Emission(equatorial port)

- Two receiving antennas, vertically offset to provide core measurements for a variety of plasma shapes.
- In-situ calibration sources
- Mature design, robust in ITER environment.

- April 22, 2004

## Tangential Interferometer/Polarimeter(part of the ECE package 13)

- Probably a two-color CO2 system with retro-reflectors on the outer midplane wall.
- Will likely need real-time alignment

- April 22, 2004

## Main Plasma Reflectometer (LFS)(package includes upper port)

- Shares an equatorial port with x-ray crystal and NPA
- X and O mode launchers provide SOL and pedestal density profiles, MHD mode information and density fluctuation measurements.
- Mature design, robust in ITER environment.

- April 22, 2004

## Motional Stark Effect(equatorial port)

- Two views, each viewing a different heating beam, to provide adequate edge and core spatial resolution.
- Six mirror optical labyrinth will make precision polarimetry difficult.  Real time calibration may be necessary.
- Obtaining adequate optical throughput will be challenging, as will background due to bright bremsstrahlung and wall reflections..

- April 22, 2004

## Upper Visible/IR Cameras(upper port)

- Six camera systems in every other upper port provide complete coverage of divertor region and provide nearly full coverage of inside wall along with 4 equatorial systems.
- Well integrated design, prototyped on JET.

- April 22, 2004

## Divertor Interferometer(divertor port)

- Originally conceived as a microwave system capable of reflectometry, ECA and interferometry, will more likely be an CO2 interferometer system.

- April 22, 2004

## Upper Port Allocation

- April 22, 2004

## Equatorial Port Allocation

- April 22, 2004

## Lower Port Allocation

- April 22, 2004

## What may happen in next 1-2 years? (If site is selected)

- ITER Project
- Selection of host laboratory for US ITER Domestic Agency
- Formation of ITER Legal Entity
- Construction Agreement
- ITER Diagnostics
- US will participate in ‘Port-Plug Task Force’ being formed
- Definition of competitive process for selection of US providers
- Expressions of interest, formation of teams
- Decisions on packages for labs and industry/university
- Etc....
- Selection of US providing teams
- Identification of R&D tasks needed to support US diagnostic efforts

- April 22, 2004