DiagnosticsOverview_CP_CDR_Rev0

Description
1. 1NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Stefan Gerhardt, drawing on much effort by: Emmanuel Balogun, Kuishon Brown Robert Ellis, B. Stratton, Steve…

Please download to get full document.

View again

of 26
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Information
Category:

Slides

Publish on:

Views: 2 | Pages: 26

Extension: PDF | Download: 0

Share
Transcript
  • 1. 1NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Stefan Gerhardt, drawing on much effort by: Emmanuel Balogun, Kuishon Brown Robert Ellis, B. Stratton, Steve Raftopoulos, Neway Atnafu Ron Bell, Filippo Scotti, Matt Reinke, Roger Raman NSTX-U CPD Diagnostic Impacts NSTX-U CP CDR B318 LSB, PPPL Aug. 3, 2016
  • 2. 2NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Overview • Diagnostics impacts can be broken into two areas: – Diagnostics mounted in the PFCs – Impact on views of existing diagnostics • Diagnostic concepts are very well defined. • We are in the process of integrating diagnostics impacts with the overall design.
  • 3. 3NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Part 1: Tile Mount Diagnostics • Goal is to provide the magnetics and TC data for machine operations, as well as physics data for analysis. • Work is in scope of the CP project.
  • 4. 4NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • Types: – Mirnov sensors – Flux loops – Langmuir Probes – Halo Current Sensors (potentially) • We have existing & well tested designs for each of these components. Tile Mounted Diagnostics
  • 5. 5NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • Poloidal Flux Loops – Large loops of wire sitting in the horizontal plane. – Typically use a metal-jacketed twisted pair in order to have a redundant loop. – Raw voltage on the loops is used to infer the vessel currents and control vertical oscillations. – Flux (integrated voltage) on the loops used to constrain equilibrium reconstruction. • Mirnov Sensors – Small solenoids use to detect the local magnetic field. – Critical for constraining equilibrium reconstruction. Magnetic Diagnostics Are Critical to the Operation of the Machine
  • 6. 6NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • Macor mandrel, bare copper wire. • Pocket and wire-way machined in tile. • Can be under the T-Bar, or adjacent to T-Bar. • Will use the same design for the CP Mirnov sensors. Mirnov Sensors Will Be Based on Existing Designs Drawing 9D1010
  • 7. 7NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 We have the Physicist Conceptual Request for Magnetic Sensor Locations Proposed Mirnov Distribution 2 in Lower Bullnose 2 in Upper Bullnose 3 in Baffle Top Proposed Flux Loop Distribution 2 in Lower Bullnose 2 in Upper Bullnose 3 in Baffle Top 3 on Vessel Exact number and locations to be resolved during PDR stage. R [m] Z[m]Z[m]
  • 8. 8NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 The Langmuir Probe Design Will Be Based on Legacy NSTX and NSTX-U Designs (I) Drawing 9D11171 What holds these together? Fortafix?
  • 9. 9NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 The Langmuir Probe Design Will Be Based on Legacy NSTX and NSTX-U Designs (II) NSTX-U design is staggered across two “columns” to improve radial resolution. Similar trick may be used for the CP PFCs.
  • 10. 10NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 TC Design Will Duplicated that in NSTX-U and NSTX Sensor potted in the blind hole in the tile. BN sleeve and TC I need to understand the role of the sleeve…
  • 11. 11NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • Will need LPs on the lower bullnose to assess particle fluxes and kinetic parametres in order to understand pumping dynamics. – Shall be comparatively dense. – Will consider the staggered design shown previously. • LPs on the upper bullnose and baffle top assess far SoL parameters. – Can have more sparse coverage. • TCs will be placed to assess both hotter and colder locations during bakeout. – This will remedy a significant error in the NSTX design, where TCs in the OBD are right above a heating tube. LP and TC Detailed Allocations Yet to Be Determined
  • 12. 12NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Part 2: Diagnostic Views • Goal is to accommodate as best possible the views of existing diagnostics. • Work on viewing chord accommodation is in scope of the CP project, but modifications to the diagnostic themselves generally are not.
  • 13. 13NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 This is the Existing Port Map
  • 14. 14NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Consider Vertical Viewing Lower Ports Vertical Viewing Ports
  • 15. 15NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Bays B & A/L Support Poloidal ChERS Matched up/down views of the beamline (Bay A/L), and of the background (Bay B) Top View
  • 16. 16NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Limits of Sightlines Have Been Provided By Diagnostician (R. Bell) Viewing Cones Limits Defined Matched up/down views of the beamline (Bay A/L), and of the background (Bay B)
  • 17. 17NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Matched up/down views of the beamline (Bay A/L), and of the background (Bay B) Bays B & A/L Will Continue to Support Poloidal ChERS Viewing Cones for PChERS
  • 18. 18NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Sector Design is Intended to Provide Access for Diagnostics Mike, can I have a powerpoint version of this slide.
  • 19. 19NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • Both have clear views into the machine. • Bay K is the location for MAPP (Materials Analysis Particle Probe). – Stroke is close to the correct length, awaits final CP baffle design for assessment. – Sample holder on the MAPP head will likely need redesign. • J is the RF Probe. – Comparatively simple probe, can be modified if necessary. • Any modifications outside of official CP project scope Bays K and J Support Probes Access volumes for MAPP and RF Probe
  • 20. 20NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • The present Bay I Upper and Lower ports will support a divertor resistive bolometer for the FY17 & 18 runs. • Elevated baffle top will completely block the lower view. • Need to assess the best path forward after completing the CP CDR. – May involve a new instrument at Bay I lower, tangential viewing bolometry, viewing from the midplane,… Bay I Divertor Bolometer Is Severely Impacted by CP Design
  • 21. 21NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • These are instruments run by collaborators from LLNL – H presently has a fast visible camera for divertor spectroscopy, with a reentrant view – E has a 1D CCD system, looking directly through a window. • Evaluating the need to redesign the Bay H reentrant view and shutter, given the raised divertor floor. – Quite possible that the Bay E 1D CCD will need a similar treatment. • Must ensure lack of interference with divertor support structure. Bay H & E Support Divertor Spectroscopy I saw additional interference images of the Bay H system, but I need help interpreting them before adding them here.
  • 22. 22NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • Initial assessments indicate minimal interferences • Still looking into this. Bay G Supports Oak Ridge IR Cameras and U. of Tennessee Spectroscopy IR Camera Spectroscopic Views I don’t believe the IR camera has such a narrow viewing cone.
  • 23. 23NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • Bay C hold a dust detector and silicon wide-angle bolometer – Need to assess impacts, may require that the detector be raised. • Bay D has historically help UV spectrometers from LLNL. – Agreement to repurpose to CP He & N2 feedthroughs • F holds a QMB – Will likely require a redesign of the in-vessel components. Finishing the Vertical Views: Bays C, D & F Charles, you agree with this regarding the dust detector? Charles, you agree with this regarding the QMB?
  • 24. 24NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 Consider Horizontal Viewing Lower Ports Horizontal Viewing Ports
  • 25. 25NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • Impacted diagnostics – Bay B Phantom camera  snowflake churning mode, turbulence and divertor dynamics – Bay B multi-chordal spectrometer DIBS  radiative divertor control, impurity spatial/temporal dynamics – Bay J divertor SPRED  radiative divertor control, impurity radiation distribution – Bay E/F divertor tangential camera  divertor impurity distribution/dynamics • Must assess alternative views for these instruments. Horizontal Viewing Divertor Ports Will Likely be Blocked by the CP design • Horizontal ports peering through gaps between secondary passive plates. • Views of the divertor relies on angled lower divertor. – Views blocked by CP baffle
  • 26. 26NSTX-U CP CDR, Diagnostics, S.P. Gerhardt, 8/3/2016 • PFC diagnostics themselves are well beyond the conceptual design stage • Their placement in the PFCs for the CP will be defined in the PDR phase. • Sightlines and obstructions for other diagnostics are being assessed. – Many diagnostics are only mildly effected, or not impacted at all.  Poloidal ChERS, vertically viewing spectroscopy and IR/visible cameras. – However, some will be lost or require major redesign.  Lower resistive bolometer, spectroscopy on the horizontal views. Summary
  • We Need Your Support
    Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

    Thanks to everyone for your continued support.

    No, Thanks