1. Review of spectroscopic diagnostic at COMPASS tokamak
Presented by
Diana Naydenkova
Institute of Plasma Physics AS CR, v.v.i.,
Association EURATOM/IPP.CR
Za Slovankou 3, Prague 8
Thanks for contributions to COMPASS team & collaborators
100 m vysoko, metru za sekundu.
ADAS Workshop 2012 / 23 – 25 September 2012

2. Spectroscopic diagnostic
Outline
COMPASS tokamak
Spectroscopic diagnostic
Thomson scattering
Two fast VIS cameras
Plasma rotation
Bolometry
Soft X-rays
Visible light detection
Spectrometer for VIS and UV
Bremsstrahlung
Summary
100 m vysoko, metru za sekundu.
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 01

3. COMPASS tokamak Major radius [m] 0.56 Minor radius [m] 0.23 x 0.38
Plasma current [kA] <180 (400)
Magnetic field [T] <1.8 (2.1)
Triangularity ~ 0.5
Elongation ~ 1.6
Pulse length [s] < 0.3 (0.5)
100 m vysoko, metru za sekundu.
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 01

4. Spectroscopic diagnostic
100 m vysoko, metru za sekundu.
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 02

5. Thomson scattering Nd:YAG (1.5 J, 30 Hz, 1064nm) Spatial resolution:
Tokamak vesel
Laser
edge & core collection optics
beam dump
Fast digitizers
Optical fibers bundle
Polychromator
100 m vysoko, metru za sekundu.
Detectors (Avalanche Photodiodes)
Spatial resolution:
Central ~10mm
Edge ~4mm
Optical delay line
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 03

6. Fast VIS camera Cypress LUPA-1300 CMOS sensor Resolution: 1280 x 1024
Speed: 541 frames/sec
100 m vysoko, metru za sekundu.
In collaboration with
KFKI-RMKI and SIU EURATOM/HAS
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 02

7. Fast VIS camera Separatrix Cypress LUPA-1300 CMOS sensor
Resolution: 1280 x 1024
Speed: 541 frames/sec
100 m vysoko, metru za sekundu.
In collaboration with
KFKI-RMKI and SIU EURATOM/HAS
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 02

8. Plasma rotation Resolution 0.004nm Range ~8nm Readout rate <10MHz
100 m vysoko, metru za sekundu.
Resolution 0.004nm
Range ~8nm
Readout rate <10MHz
QE >90%
In collaboration with IPP, EURATOM/IST
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 02

9. Tomographic system AXUV photodiodes (bolometers)
100 m vysoko, metru za sekundu.
AXUV photodiodes (bolometers)
temporal resolution 1MHz
spectral range: 7eV – 6 keV
Photodiodes (windowless)
temporal resolution 1MHz
spectral range: 0.5 (Be foil) – 10 keV
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 02

10. Visible light measurements
two angular port plugs
interference filters (line selection/Zeff) with FWHM of 10 nm / 2 nm
optical fibers (high OH silica) of diameter 200 mm, length ~20 m
photomultipliers / two photodiode arrays (35 channels, 1 ms)
100 m vysoko, metru za sekundu.
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 02

11. Minispectrometers 100 m vysoko, metru za sekundu. 03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 02

12. Minispectrometers 100 m vysoko, metru za sekundu. 03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 02

13. Spectroscopic diagnostic
~523nm
~5 mV noise
C III
H a
bremsstrahlung
All VIS
100 m vysoko, metru za sekundu.
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 02

14. Impurities influx and concentration L-H transition Pedestal parameters
Summary
Plasma rotation
Zeff
Impurities influx and concentration
L-H transition
Pedestal parameters
Charge exchange spectroscopy
IR camera
100 m vysoko, metru za sekundu.
03/12/2018
Review of spectroscopic diagnostic at COMPASS tokamak / ADAS Workshop 2012 / 23 – 25 September 2012 02