1. Electron Temperature Analysis in AUG using X-Ray PHA, comparison with ECE
Arthur Weller,
Thanks to Laura Barrera Orte, Rainer Fischer
AUG Program Meeting, 26 Sept 2011
● Example: first observation of W-L lines in tok.
● PHA line of sight equivalent with
Single Bragg spectrometer LOS
( A-port of sector 1)
● SDD detector at R = m, z = m

2. Forward Modelling of X-Ray Distributions - to extrapolate line integrated measurements to central values -
● input: AUG profiles from integrated
data analysis (IDA)
● simple model for X-ray continuum rad.
( P ~ ne2∙exp(E/kTe) )
● profile correction factors from slope
of central and central LOS integrated
continuum spectra (for each time points)

3. Comparison of Te0 from PHA and ECE (IDA) - Te from fitting slope of continuum spectrum -
W lines
lin.
~ e(E)∙exp(E/kTe)
● X-ray spectra dominated by
tungsten M-line radiation (W38+ … W49+)
● particular case (ECRH + ICRH)
shows good agreement between
ECE and SX Te-values …
Te,ECE(0), IDA
Te,PHA(0), corr.
Te,PHA, Line int.
log.

4. Comparison of Te0 from PHA and ECE (IDA) - suprathermal tail in low density ECRH plasma -
Te,PHA, Line int.
Te,PHA(0), corr.
Te,ECE(0), IDA
ECE temperature agrees better
with SX-PHA tail temperature !
unreliable

5. Comparison of Te0 from PHA and ECE (IDA) - suprathermal tail in low density phase of ECRH plasma -
Te,PHA(0), corr.
Te,ECE(0), IDA
Te,PHA, Line int.
ECE temperature agrees better
with SX-PHA tail temperature !

6. Comparison of Te0 from PHA and ECE (IDA) - NBI high density standard H-mode -
● fitted values robust against
choice of energy interval for fits
● PHA yields significant higher Te
compared with ECE & Thomsen !?

7. Comparison of Te0 from PHA and ECE (IDA) - 31 shots (596 data) out of 2011 with calib. ECE and IDA -
● PHA Line of sight measurement
converted to central Te
(correction factor from model
using fitted ECE profiles (IDA))
● central ECE Te values from
extrapolation of ECE data
by IDA-Fits
● Preliminary Conclusion:
- at low density, ECE temperature
correspond to suprathermal tail
- scatter of data not fully understood
- cross-calibration ECE-PHA
difficult