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Revised Diagnostics Plan

Revised Diagnostics Plan. D. Johnson, B. Stratton, E. Lazarus, H. Takahashi, E. Fredrickson, M. Zarnstorff. Outline. Diagnostics included in the project Rogowski coils to measure I p , and ‘trapped’ magnetics fast visible camera to verify plasma shape

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Revised Diagnostics Plan

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  1. Revised Diagnostics Plan D. Johnson, B. Stratton, E. Lazarus, H. Takahashi, E. Fredrickson, M. Zarnstorff

  2. Outline • Diagnostics included in the project • Rogowski coils to measure Ip, and ‘trapped’ magnetics • fast visible camera to verify plasma shape • e-beam mapping to confirm vacuum field configuration • diagnostic integration • Will rely on Research Preparation to fund design and early fabrication of diagnostic upgrades for Phase III and IV.

  3. Magnetics funded in the Project include Rogowskis needed to measure IP for 1st plasma, and a large number of sensors “trapped” during machine assembly. Saddle coils, 2 examples of which are shown at right in red, will be installed on the outside surface of the vessel prior to the installation of the vessel cooling lines. All of the modular coils, along with the TF, PF, OH and trim coils will also have co-wound sensors encased in epoxy. ICDs exist to define these interfaces. To evaluate large scale eddy currents in MC support structure, saddle loops will be wound on structure segments. Only the Rogowski coils will be instrumented for 1st plasma. “Trapped” magnetic sensors

  4. For 1st plasma Fast visible camera will be mounted behind window at a tangential NB port Camera and local magnetic shield will be supported directly from port Camera will have full frame rate of ~ 1khz to resolve startup plasma Fast visible camera

  5. Defining field line mapping requirements Sector-1 Displaced Vertically by 2 mm PIES Code Perfectly Aligned • Modular coils only energized in series for this study • Rigid-body displacement of a whole sector • Islands (2/5) clearly identifiable for 2 mm displacement • Not enough information available to unequivocally identify types of misalignment - will likely have to rely on careful metrology. • Study shows beam detection at the v=.5 symmetry plane will produce most defined islands

  6. After first plasma campaign and before cryostat is installed, e-beam mapping will be performed to confirm the vacuum magnetic field configuration. A conventional system is budgeted, consisting of an electron gun mounted on a probe, a phosphor-coated mesh mounted at v=.5 symmetry plane with a short range of motion, and a CCD camera viewing through a vacuum window. Also considering other approaches for detection, including a movable phosphor-coated rod, and a rod featuring a phosphor-coated fiber array for much higher optical throughput. e-Beam mapping

  7. New flared port design offers excellent, wide angle, high throughput access to v=0 symmetry plane. For several optical diagnostics, flared design provides ≥ x2 improvement. Note large radially elongated vertical ports also in v=0 plane. Flared ports are example of integration

  8. Preliminary diagnostic implementation plan P R O J E C T

  9. Implementation plan

  10. Need to assess diagnostic needs prior to 1st plasma for the design and early fabrication of long-lead diagnostic systems for phases III & IV. Over the next couple of months, B. Stratton and I will put together a conceptual level, resource loaded schedule through FY07, based on the implementation plan. FY-04 FY-05 FY-06 FY-07 FY-08 FY-09 Fitting it all together

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