diagnostic needs for session leaders

S. Jachmich (slide 1) Diagnostics SL-Training, Nov 2010

Diagnostic needsDiagnostic needsfor session leadersfor session leaders

Stefan JachmichStefan JachmichSL-Training 2010SL-Training 2010


OverviewOverview

Diagnostic Coordinator

Structure of data acquisition

Essential diagnostics for operation

Diagnostics for scientific exploration

Where to find information about diagnostics


Diagnostic Coordinator (DCO)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)


DCO – before the sessionDCO – 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


Diagnostic Request Sheet (DRS)Diagnostic Request Sheet (DRS)

Data-Homepage (or http://jlsdbhost.jet.efda.org/jls/experiments/indexdrs.html )

R Routine

This diagnostic will be routinely available during operations with timing/field settings made either automatically or by DCs or rostered staff. Analysis up to Chain1-level will be performed. The diagnostic will not necessarily be manned.

E EssentialThe session aims cannot be achieved without this diagnostic.

S SpecialRequest specialist operation beyond the scope of the basic level.

Key to define the Diagnostic request:


DCO-Control Room TasksDCO-Control Room TasksDuties 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”


Overhead DisplayOverhead Display

Signals

Comments


DCO-Tasks after a session (?)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


Understanding the DCOUnderstanding the DCO

K n (D/E/G) i=1,2,...,9 [D – MkI, E MkIIA, G MkIIGB]

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


Data FlowData Flow

TF

PF

DA

DB

JPF

Jet Pulse File:Raw data

(but calibrated)unchangeable

...

PPF CPF

Processed Pulse File:Contains physics

parameters(ne, Te, etc.)

Central PhysicsFile:Contains physics

parameters at interesting times(see TSLC-PPF)

Subsystems:t=

3-6

min

s. a

fte

r th

e p

uls

e

Chain1 process (Intershot routine)

Completed 3-8 mins.Can be reprocessed

and amended afterwards

Created overnight and

updated nightly when PPF is

updated

JETDSP:Subsystem-name node names

JETDSP:DDA-nameDataType name

Use CPFWebinterface

Note: a PPF can have several DDAs


Essential DiagnosticsEssential DiagnosticsDiagnostics 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]


Magnetic DiagnosticsMagnetic Diagnostics

Main diagnostic for PPCC-SC: KC1D or KC1

Main diagnostic for PPCC-VS: KC1D

Saddle Coils

Flux Loops

Approximately 500 coils and loops:

Pick-up coils

Saddle coils

Full flux loops

Diamagnetic loops


Magnetic Diagnostics (2)Magnetic Diagnostics (2)

Plasma slammed into outer wall:

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)

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


XLOC viewerXLOC 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


XLOC-signalsXLOC-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)


Interferometer and BremsstrahlungInterferometer and BremsstrahlungInterferometer (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


Neutrons and Hard X-raysNeutrons 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, ...


Wide angle cameraWide 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 AILARF B


Bolometer (KB5)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


VUV-spectrometerVUV-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


Divertor thermocouples (KD1D)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


Other diagnostics Other diagnostics

(not essential)(not essential)


Core profile measurementsCore 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


mm/microwave spectroscopymm/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


Charge eXchange Recombination SpectroscopyCharge 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


IR-camerasIR-cameras 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.)

MTL1

MTL2MTL3

MTSBMTSA


IR-cameras (2)IR-cameras (2)

KL9: divertor viewing Oct 5

Time resolution ~40s

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


ELM-analysisELM-analysis Fast Da-signals good indicator for

divertor particle flux (DD/S3-AD35 and

AD36

ELM Energy drop: DDA BTLI /WDIAAD35AD36


Diagnostics requiring special attentionDiagnostics 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


Not a diagnostic, but still of use: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 LOFof diagnostics

FLUSH-routines to assessEFIT-DDA


Data validationData 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:

ReqCo http://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.


More informationMore 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


SummarySummary

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

diagnostic needs for session leaders

Documents