Diagnostic needs for session leaders

1. Diagnostic needs for session leaders Stefan Jachmich SL-Training 2010

2. Overview • Diagnostic Coordinator • Structure of data acquisition • Essential diagnostics for operation • Diagnostics for scientific exploration • Where to find information about diagnostics

3. Diagnostic Coordinator (DCO) • The DCO co-ordinates and monitors the operation of all diagnostics necessary for the experiment • The DCO should ensure the best quality of the experimental data from a session => The DCO has to be involved in the preparation of the session! What you should discuss with the DCO (ideally before the session, not at the start of the session!): • Identify diagnostics which are essential and/or of absolut importance for the scientific success of the session and would justify a repeat of the pulse if they failed • Are there essential diagnostics, which require specific plasma parameter? • What are main time windows of interest in the pulse (may be print “Big picture” of your PTs) • What (and how many) changes of diagnostic settings to expect • What are the main parameters to display (and where to get them)

4. DCO – before the session Duties before the session: • Defines diagnostic requirements together with SL and SC (scientific coordinator) • Prepares the Diagnostic Request Sheet for Friday’s Co-ordination meeting • Ensures that required diagnostic experts can be available in the control room for the session

5. Diagnostic Request Sheet (DRS) • Data-Homepage (or http://jlsdbhost.jet.efda.org/jls/experiments/indexdrs.html ) • Key to define the Diagnostic request:

6. DCO-Control Room Tasks Duties during the session: • Monitors status of Diagnostic Systems and progress of data collection (chain1) and basic validation • Ensures that Diagnostic Systems are optimised for the experiment: >> time windows, settings (e.g. ECE) • Informs SL, SC and EiC about any diagnostic problems and take necessary actions to remedy upcoming problems (but also report to DCO if you discovered a problem) • Updates the Control Room Overhead Display (discuss with SC what should be displayed) • Interacts with Control Room experts: SL, SC, EiC, Ros, CDOs, ShiftTechs • Supports SL with intershot diagnostics results • Indicate when diagnostics are “Ready for Pulse”

7. Overhead Display Signals Comments

8. DCO-Tasks after a session (?) Duties after the session: • Logs any diagnostic problem during the session (jotter) • Summarizes diagnostic performance for SL-reports • Contributes to interpretation of SC-reports • Summarizes results of preliminary data validation process

9. Understanding the DCO K a n (D/E/G) i=1,2,...,9 [D – MkI, E MkIIA, G MkIIGB] a: A = Alpha particle diagnostics B = Bolometers C = Magnetic measurements D = Thermocouples E = Scattering diagnostics F = High energy NPA G = Interferometer/Reflectometers H = Hard X-ray/Spectrometers J = Soft X-ray flux K = mm/microwave Spectroscopy L = Camera viewing systemsd M = Neutron spectrometers N = Neutron flux measurements R = Low energy NPA S = Visible spectroscopy T = UV/VUV spectroscopy V = Erosion/deposition X = X-ray spectrometers W = Vacuum feedthroughs Y = Edge measurements

10. Data Flow Chain1 process (Intershot routine) Completed 3-8 mins. Can be reprocessed and amended afterwards Created overnight and updated nightly when PPF is updated Subsystems: PF TF CPF JPF PPF t=3-6 mins. after the pulse DA Jet Pulse File: Raw data (but calibrated) unchangeable Processed Pulse File: Contains physics parameters (ne, Te, etc.) Central PhysicsFile: Contains physics parameters at interesting times (see TSLC-PPF) DB ... JETDSP: Subsystem-name node names JETDSP: DDA-name DataType name Use CPFWeb interface Note: a PPF can have several DDAs

11. Essential Diagnostics Diagnostics essential for operations are defined in JOI 5.3. • Required diagnostic depend on type of operation (Dry run, Ohmic, with Aux. Heating, ...) • Ohmic plasmas: • Magnetics (KC1): Vertical stabilization of plasma [DA] • Magnetics (KC1 & KC1D): Plasma position and shape control [DA] • Interferometer (KG1): Plasma density feedback [DF] • Bremsstrahlung (KS3): Plasma density feedback (backup) [DD] • Hard X-Rays (KH1): Runaway electrons [DD] • Wide angle camera: Wall-protection [DA] • with heating excl. LH: • Divertor thermocouples (KD1D): Divertor structure protection (energy limit) [DB] • IR-camera: Wall-protection • with heating incl. LH: • Bolometers (KB5V): Plasma radiation (interlock with LH) [DB] • VUV-spectroscopy (KT2, KT4): Impurities (Fe, interlock with LH) [DF]

12. Magnetic Diagnostics Approximately 500 coils and loops: • Pick-up coils • Saddle coils • Full flux loops • Diamagnetic loops Flux Loops Main diagnostic for PPCC-SC: KC1D or KC1 Main diagnostic for PPCC-VS: KC1D Saddle Coils

13. Magnetic Diagnostics (2) • PPCC-SC: requires Ip-measurement and RT-boundary reconstruction (XLOC) • PPCC-VS: uses an observer to determine vertical displacement and velocity • Mainly sensors in Oct 3 (X) plus a few in Oct 7 (Y) are used ( impact with operation when external magnetic perturbations are applied) Plasma slammed into outer wall: • In case of magnetic coil failure: • Boundary reconstruction might be wrong • possible debugging: • check XLOC-display • check coil signals • JET-Magnetics webpage http://users.jet.efda.org/pages/mags/ppcc/ppcc-sc/ppcc-sc.html

14. XLOC viewer • XLOC is a RT-code, which produces an approximate solution to G-S equation at the plasma boundary using polynomials • Control room viewer displays plasma shape in real time • Also real time signals are displayed directly • Type of displayed RT-signals is configurable

15. XLOC-signals • XLOC determines distance of plasma boundary to vessel • XLOC determines Xpt and vessel contact point if limiter plasma (PF/SC-CTYP<XS) = –3 (divertor)

16. Interferometer and Bremsstrahlung Interferometer (KG1): • FIR-Interferometer – density control in Real Time • Line integrated density (LID) on 4 vertical and 4 horizontal chords (dt=1ms) • KVS Blender: allows SL to calculated weighted average of LIDs • JOI 4.2: either <LID2+LID3> or LID3 • Output in RTSS as DENS1, DENS2 and DENS3 • DDA: KG1V Bremsstrahlung (KS3): • Four channels: horiz., vertical, inner & outer divertor (dt=1ms) • average of horiz. and vert. channel calibrated in RT against KG1 and used as backup • DDA: KS3

17. Neutrons and Hard X-rays Fission Chambers (KN1): • Time resolved Neutron Yield • Measure either DD or DT-neutrons • Monitors located at midplane of Oct 2,6 &8 • DDA: TIN Hard X-rays montitors (KH1): • Six detectors working • Needed for runaway electron detection • JPF: DD/H1-AD01, ...

18. Wide angle camera Wide angle camera (KL1): • mounted on endoscope in Oct. 1 (or Oct. 8) • provides Real-Time input to SL (outputs to button) • check for Hot Spots, UFOs, Marfes • Replay via jetmovie • dt=20ms RF B ILA RF A

19. Bolometer (KB5) Bolometer cameras (KB5): • Vertical camera KB5V on MVP in Oct.3 • Horziontal camera KB5H on MHP in Oct.6 • Time resolution: 2ms • Essential for LH-operation • DDA: BOLO • Keep GIM 7 off for reliable reconstruction

20. VUV-spectrometer VUV-spectrometer (KT2, KT4): • Measures spectral line intensity in VUV-region • Provides impurity survey • Essential for LH-operation • DDA: T2I0 • Some lines are in RealTime available LH stopped FeXXIII

21. Divertor thermocouples (KD1D) Thermocouples: • 30 Thermocouples installed in back of tiles • Measure tile bulk temperature • Calculate deposited tile energy (JOI 2.1) • DDA: DVTC • new thermocouples might be installed in limiters • added to Real-Time network

22. Other diagnostics (not essential)

23. Core profile measurements • Core Lidar (KE3): ne(r), Te(r), dt=250ms (max. 35 sec) • DDA: LIDR,LIDX; contains also line integrated ne mapped to KG1 • High Resolution Thomson Scattering (KE11): dt=50ms • DDA: HRTX; contains also line integrated ne mapped to KG1 • Edge Lidar (KE9D): mothballed

24. mm/microwave spectroscopy • ECE Michelson Interferometer (KK1): Te(r), dt~200ms • Toroidal field > 1.7 T • DDA: ECM1 • ECE heterodyne radiometer (KK3): Te(r), dt~0.4ms • Toroidal field > 1.7 T • DDA: KK3

25. Charge eXchange Recombination Spectroscopy • Core CXRS (KS5) • measures profile of ion temperature and toroidal velocity (dt=50ms, max 10sec) • derives also concentration of low Z impurities • needs PINI 8.6 or 8.7 • Edge CXRS (KS7) • measures edge ion temperature and poloidal rotation • needs PINI 4.4, 4.6, 8.4 or 8.6

26. IR-cameras MTL1 MTL3 MTL2 MTSA MTSB • IR-cameras measure Infra-red radiation of a material • Surface temperatures can be determined by applying material specific calibration • At JET (last campaigns): KL7 (wide angle) and KL9 (divertor view) KL7: wide angle viewing Oct 2 • Time resolution ~16ms • Useful PPFs: KL7H (ppfuid=chain1) gives temperatures of five limiters in view JOI 2.3 (old: Tsurf <1200,1600oC) • IRDisp (on JAC): • replay movie • more detailed analysis (user-ROI, etc.)

27. IR-cameras (2) KL9: divertor viewing Oct 5 • Time resolution ~40ms • Useful PPFs: L9AC (ppfuid=kl9ppf): calculates surface temperature of tile 5 • Operational constraint: Strike point must be on tile 5 (and tile 3) CFC W

28. ELM-analysis • Fast Da-signals good indicator for divertor particle flux (DD/S3-AD35 and AD36 • ELM Energy drop: DDABTLI /WDIA AD35 AD36

29. Diagnostics requiring special attention Fast reciprocating probe (KY3A) • mounted on top of Octant 5 • requires SL-approval for each pulse with probe insertion • pulse has first to be run without probe • JOI 6.1 Disruption mitigation valve (KY8) • mounted on top of Octant 1 • operation only with Gold Form • Regeneration of Cryo required • Gas has to be approved by Coord • JOI 6.3

30. Not a diagnostic, but still of use: SCAL: scaling law related parameters • provides energy confinement times, confinement factors, LH-power threshold scaling, Greenwald density EFIT: Equilibrium reconstruction • SURF to display flux surfaces • SURF also displays LOF of diagnostics • FLUSH-routines to assess EFIT-DDA

31. Data validation • Data Validation Responsible Officers (DVROs) are responsible for validating PPF data from each diagnostics • Some PPFs contain validation status flag (0=data unchecked, 2=normal quality) • Validation can be done on request ReqCo http://users.jet.efda.org/reqco/requests.html • Some PPFs are produced only on request: ReqCohttp://users.jet.efda.org/reqco/requests.html • If essential for experiment: notify your DCO • Data Validation Coordination Meetings (DVCM): bimonthly meeting, where DVROs report on recalibration, improvements, etc. Each new intershot-routine is presented and approved at this meeting.

32. More information • JET Data webpage: http://users.jet.efda.org/pages/data.html • JET Data Handbook: http://users.jet.efda.org/pages/data-dmsd/jetdatahandbook/web/php/contents.php • Task Force D webpage: User-page  Task Forces

33. Summary Topics covered: • liaison with diagnostic coordinator • basic data structure and handling • essential diagnostics for operation • some important diagnostics and constraints of operation on them Topics not covered: • all diagnostic capabilities (see Data Handbook) • enhancements and installation of new diagnostics