1. magnetic confinement - ENEA - Fusione
1. magnetic confinement - ENEA - Fusione
1. magnetic confinement - ENEA - Fusione
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
54<br />
<strong>1.</strong> MAGNETIC CONFINEMENT<br />
<strong>1.</strong>5 PROTO-SPHERA<br />
fl 2000<br />
Insulation<br />
Anode<br />
Support<br />
Structure<br />
Type<br />
coils B<br />
Divertor<br />
plates<br />
Type<br />
coils A<br />
Fig. <strong>1.</strong>55 - PROTO-<br />
SPHERA load assembly.<br />
Protection<br />
plates<br />
Cathode<br />
Table <strong>1.</strong>IV - Machine parameters<br />
Spherical torus diameter<br />
0.7 m<br />
Longitudinal screw pinch current<br />
60 kA<br />
Toroidal spherical torus current<br />
120-240 kA<br />
Plasma pulse duration<br />
1 s<br />
Minimum time between two pulses (duty cycle)<br />
5 min.<br />
Maximum heat loads in divertor first-wall components ~2 MW/m 2<br />
Maximum heat loads on rest of first wall<br />
3 MW/m 2 , for 1 ms<br />
Maximum current density on plasma-electrode interface 1 MA/m 2<br />
has a flat 30-mm top, and bottom flanges for all services, while the diagnostic and<br />
vacuum ports are in the main body.<br />
The poloidal field coils are water-cooled vacuum-impregnated OFHC Cu to<br />
accommodate the 5-min duty cycle of the machine. Type A coils (fig. <strong>1.</strong>55) have<br />
currents varying with time during plasma evolution and thin (<strong>1.</strong>5-mm Inconel)<br />
casings; type B coils have constant currents in thick (10-mm stainless steel) casings.<br />
The anode of the machine is made mainly from Cu, with replaceable WCu modules<br />
to allow for the hotspots. The anode consists of six sectors with five modules per<br />
sector. There are also 600 holes (10-mm-diam.) in total to accommodate the gas flow
Change language