Associazione Euratom-ENEA sulla Fusione -----
RISERVA
Verticale
Culham 15-17 September 2003
Associazione Euratom-ENEA sulla Fusione -----
Aims of PROTO-SPHERA
The idea is to form an ULART by producing a
Screw Pinch that will be destabilized by
increasing the longitudinal arc current Ie: such
a configuration has been obtained for the first
time on the TS-3 experiment
(Tokyo University)
Screw Pinch with longitudinal field BZ toroidal field Bf
safety factor qPinch = 2p rPinch BZ/LPinch Bf
Culham 15-17 September 2003
Associazione Euratom-ENEA sulla Fusione -----
ProtosPhera CATIA Drawing
Culham 15-17 September 2003
Associazione Euratom-ENEA sulla Fusione -----
PROTO-PINCH Experimental Set-Up
Gas Feed
8 conductors for
the Ie return
External coils.
Visible
Spectroscopy
Pyrex
vacuum
vessel
MicroWave
Interferometry
Vacuum
Pump
Cathode
Vacuum Pump
Culham 15-17 September 2003
Associazione Euratom-ENEA sulla Fusione -----
COILS
Two groups of PF coils (jPF≤2 kA/cm2), each composed
by coils connected in series
Group 'B' - shape the pinch with constant currents
Group 'A' - compress the ST with variable currents
Culham 15-17 September 2003
Associazione Euratom-ENEA sulla Fusione -----
Main Features
ST diameter 2•Rsph=0.7m
Toroidal plasma current Ip=240kA
Aspect ratio A=1.2, elongation k=2.35
Similar to the START spherical torus experiment
Pinch current Ie=60 kA « Itf≈200 kA (START centerpost)
Culham 15-17 September 2003
Associazione Euratom-ENEA sulla Fusione -----
Cost, Schedule & Size
Vessel, including: tiles, supports,
Baking system and base
Design contract
Subtotal
665,000 €
77,000 €
742,000 €
Poloidal field coils, including :
feedthroughs and cooling system
Design contract
Subtotal
826,000 €
77,000 €
903,000 €
Anode and Cathode, including
feedthroughs and cooling system
Design contract
Subtotal
297,000 €
50,000 €
347,000 €
Assembly contract
Pumps, gas feed & control system
TOTAL
Power supply:
Pinch feeder ‘P’
Cathode feeder ‘K’
PF feeder ‘A’
PF feeder ‘B’
Subtotal
Electrical work contract
TOTAL Power Supply
GRAND TOTAL
90,000 €
200,000 €
2,282,000 €
904,000 €
102,000 €
150,000 €
31,000 €
1,187,000 €
93,000 €
1,280,000 €
3,562,000 €
Culham 15-17 September 2003
Associazione Euratom-ENEA sulla Fusione -----
MultiPinch Costs
• Capital costs of multi-pinch test
Load assembly (vessel and electrodes)
PF coils and sustaining columns
Power supplies
TOTAL
460000 €
230000 €
246000 €
936000 €
:
:
:
:
• If, after the multi-pinch test, the decision to
build PROTO-SPHERA was taken, between
585000 € and 770000 € of the capital expenditure
of the multi-pinch test could be still put at work.
Schedule of multi-pinch test
• If proposal is accepted in 2003:
first plasma by the end of 2005.
Culham 15-17 September 2003
Associazione Euratom-ENEA sulla Fusione -----
Panel Question & Answers
1.
Is the physics basis for undertaking an experiment as
proposed with PROTO-SPHERA adequate?
OK, BUT We recommend that a wider range of
operation scenarios of m and pressure profiles be
analyzed ...
2) Are the PROTO-PINCH electrode experiments a
sufficient technical basis for a reliable electrode
operation in PROTO-SPHERA?
OK, BUT… are not yet adequate for reliable multielectrode operation...
3)
4)
5)
6)
7)
… In particular, is the proposed size adequate for the
purposes of a Concept Exploration Experiment? .. OK
How likely is .... to advance the present state of science
and technology substantially.. OK
.. likely to produce new information that is adequate as
basis to extrapolate to a SPHERA device that achieves
fusion relevant paramenters? OK
What diagnostics should be planned in order to properly
measure the properties of the PROTO-SPHERA
plasma? OK
What are the unique contributions of the proposed
experiment to the world magnetic fusion programs, and
in particular to the European Magnetic Fusion Program
during the VIth FP? OK
Culham 15-17 September 2003