2000 PROGRESS REPORT - ENEA - Fusione
2000 PROGRESS REPORT - ENEA - Fusione
2000 PROGRESS REPORT - ENEA - Fusione
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1. Magnetic Confinement<br />
mm<br />
20<br />
15<br />
10<br />
5<br />
0 5 10 15 20<br />
mm<br />
Fig. 1.5 - Image of a stainless steel wrench placed<br />
close to the detector, at Fig. very 1.05high counting rates<br />
(about 2 MHz/pixel). In the representation, the area<br />
of the square related to each pixel is proportional to<br />
the counts<br />
Counts / ms<br />
5000<br />
4000<br />
3000<br />
<strong>2000</strong><br />
1000<br />
0<br />
Lower hybrid<br />
Electron<br />
cyclotron<br />
ch 1<br />
ch 2<br />
ch 3<br />
ch 4<br />
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6<br />
Time (s)<br />
Fig. 1.06<br />
Fig. 1.6 - Signals from 4 pixels of the GEM detector aligned off<br />
axis for a plasma heated with RF power (LH and ECRH) from<br />
ch1 more central to ch4 at half radius from 0 to 20 cm<br />
imaging capabilities, the shadograph of a wrench<br />
(fig.1.5) is shown, which was obtained with an<br />
exposure time of 50 µs.<br />
An x-ray pinhole camera based on this detector has<br />
been tested on FTU in a preliminary configuration.<br />
The detector’s optical view is limited to roughly one<br />
third of the plasma minor radius. The system has been<br />
then tilted to investigate the intermediate radial<br />
position (8
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