## Calibration | back

To get the proper position of detectors and the slit, the optical calibration was used. The light source was placed in front of detectors inside camera obscura. The source moved in parallel way to detector array. Output signal was measured. The maximum of output signal corresponds to the field of sight of detector. First calibration of AXUV 1 was done in Kurchatov Institute in Moscow. The light source was small halogen lamp (lamp diameter 10 mm, filament diameter 3 mm) placed in distance 472 mm from slit. Second calibration of AXUV 1 was done at CASTOR tokamak. Light source was 60W bulb placed in distance 534 mm from slit (two times of real distance). |

Calibration of AXUV 2 was done 30.3.2005 on CASTOR tokamak. Light source was halogen lamp placed in distance 1050 mm from slit. The calibration in situ was done for both arrays 4.8.2005. The light source, small lamp, was placed inside the tokamak chamber.

| up

AXUV array 1 (with horizontal resolution on plasma column; located at bottom flange)
Channel number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16
r [mm] | -89.8 (-90.2) | -80.1 | -69.6 | -58.7 | -47.5 | -35.9 | -24.2 | -12.2 | -0.1 | 12.0 | 24.1 | 36.1 | 47.9 | 59.4 | 70.7 | 81.6
a [deg] | 21.8 | 19.5 | 17.1 | 14.7 | 12.3 | 9.8 | 7.2 | 4.7 | 2.1 | -0.5 | -3.1 | -5.7 | -8.2 | -10.8 | -13.3 | -15.7
coeff. [W/V/chord] | 955 | 815 | 723 | 659 | 613 | 579 | 553 | 533 | 519 | 508 | 501 | 496 | 493 | 493 | 495 | 500
S [mm2] | 8527 | 19545 | 20361 | 21207 | 22076 | 22956 | 23835 | 24699 | 25533 | 26323 | 27053 | 27711 | 28285 | 28766 | 29147 | 29426

The slit axis is shifted by Δ x = 9,5 mm to LFS from the chamber axis. Distance between the slit and the bolometric array is a = 19,7 mm. Distance between the slit and the plasma centre is L = 267 mm. Spatial resolution of one detector is q = 11 mm. Distance between the chord centre and the plasma centre is given by Radiated power per given chord (integrated toroidally) is given by Radiance (power per sr per m2) Notice: Positive r means LFS, negative r means HFS. The channel No.1 is localised at LFS and looks on a part of plasma column at HFS. The channel No.1 is partially limited by the diagnostic port and is not suitable for a profile reconstruction. AXUV array 2 (with vertical resolution on plasma column; located at radial flange) | up

Channel number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20
r [mm] | 94.1 | 84.5 | 74.6 | 64.6 | 54.4 | 44.1 | 33.6 | 23.0 | 12.4 | 1.7 | -9.0 | -19.6 | -30.2 | -40.7 | -51.2 | -61.4 | -71.5 | -81.4 | -91.1 | -
a [deg] | 16.0 | 14.3 | 12.6 | 10.9 | 9.2 | 7.4 | 5.6 | 3.9 | 2.0 | 0.3 | -1.5 | -3.3 | -5.1 | -6.8 | -8.6 | -10.3 | -12.1 | -13.8 | -15.4 | -
coeff. [W/V/chord] | 731 | 700 | 679 | 663 | 650 | 641 | 633 | 628 | 625 | 624 | 625 | 627 | 632 | 638 | 647 | 658 | 673 | 693 | 720 | -
S [mm2] | 21666 | 21837 | 21992 | 22129 | 22248 | 22348 | 22427 | 22485 | 22521 | 22535 | 22528 | 22498 | 22447 | 22375 | 22282 | 22169 | 22038 | 21888 | 21722 |

The slit axis is not shifted from the chamber axis. Distance between the slit and the bolometric array is: 28.6 mm. Distance between the slit and the plasma centre is: L = 342 mm. Spatial resolution of one detector is: q = 9 mm Distance between the chord centre and the plasma centre is given by: Radiated power per given chord (integrated toroidally) is given by: Radiance (power per sr per m2): Notice: Positive r means up, negative r means down. The channel No.1 is localised down and looks on a upper part of plasma column. The channel No.1 and No.19 are shielded by the diagnostic port and are not suitable for a profile reconstruction. The channel No.20 is out of order. | up