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New Radial Build DataNew Radial Build Data
L. El-GuebalyFusion Technology Institute
UW - Madison
With input from:R. Raffray, S. Malang, X. Wang (UCSD),
L. Bromberg (MIT)
ARIES-CS Project MeetingNovember 17 – 18, 2005
UCSD
2
Recent Changes to Radial Build(3 FP Configuration; LiPb/FS System)
6 Shield-only zones:• 20 cm thick He manifolds* added; two modules per zone; one He access
tube per module (32 cm ID).• Issues and concerns:
• Impact of manifolds on overall machine size and cost• Impact of tubes on reweldability of manifolds• Tubes remove ~40 cm of shielding materials fi hot spots at magnet• Thick local shield needed behind VV to protect magnet.
• Rewelding of VV in this area can be avoided, per Siegfried.
Nominal Blanket/shield zone:• HT shield increased from 18 cm to 28 cm to protect manifolds.• Tubes remove ~30 cm of shielding materials fi hot spots at magnet• 206 local shields needed to protect VV and magnet.• Observations:
• No major impact on machine size• More expensive shield.
____________* Siegfried suggests 15 cm thick manifolds.
3
Recent Changes to Radial Build (Cont.)(LiPb/FS System)
New magnet design:• 4K magnet composition, per Leslie:
18.5% Incoloy-90848.2% Cu12.8% Nb3Sn10.0% Insulation*10.5% Liquid He
• Winding pack dimension not available. 30 x 30 cm assumed.• Thickness of external and side structures not available. 10-20 cm assumed.
• Monitor:• Peak (< 2 mW/cm3) and• Total nuclear heating at magnet and cryogenic heat load• dpa to Cu stabilizer (< 6x10-3)
____________* Type not available. Used GFF polyimide as placeholder.
New magnet has no major impact on radial build definition
4
9/05 Radial Build(3 MW/m2 peak G)
Thickness(cm)
D ≥ 171 cm| |
SOL
Vac
uum
Ves
sel
Back
Wal
l
Gap
Thickness(cm)
Gap
+ T
h. In
sula
tor
Coi
l Cas
e & In
sula
tor
Win
ding
Pac
k
Plas
ma
5 2 217 312.228
| |Dmin = 119 cm
ShieldOnlyZone
@ Dmin
5
Blanket/ShieldZone
FW
3.8
Exte
rnal
Str
uctu
re
18
1.5 cm FS/He
FW/Blkt/BW
WC
Shi
eld-
I(r
epla
ceab
le)
38
WC
Shi
eld-
II(p
erm
anen
t)
SOL
Vac
uum
Ves
sel
HT
FS S
hiel
d
Gap
3.8
cm F
W
Gap
+ T
h. In
sula
tor
Win
ding
Pac
k
Plas
ma
5 2 ≥ 218 312.228
Coi
l Cas
e & In
sula
tor
5 cm
Bac
k W
all
Exte
rnal
Str
uctu
re
18
25 cmBreeding
Zone-I
25 cmBreeding Zone-II
0.5 cmSiC Insert
1.5 cm FS/He
1.5
cm F
S/H
e
63| | 35
Man
ifold
s
VV
BlanketShield
Magnet
WC
Shi
eld-
only
or
Tran
sitio
n R
egio
n
Manifolds
5
New Radial Build(3 MW/m2 peak G, changes marked in red)
Thickness(cm)
| |Thickness
(cm)
ShieldOnlyZone
@ Dmin
Blanket/ShieldZone
VV
BlanketShield
Magnet
WC
Shi
eld-
only
or
Tran
sitio
n R
egio
n
Manifolds
FW/Blkt/BW
D ≥ 181 cm
SOL
Vac
uum
Ves
sel
HT
FS S
hiel
d
Gap
3.8
cm F
W
Gap
+ T
h. In
sula
tor
Win
ding
Pac
k
Plas
ma
5 2 ≥228 302.228
Coi
l Cas
e & In
sula
tor
5 cm
Bac
k W
all
Exte
rnal
Str
uctu
re
10
25 cmBreeding
Zone-I
25 cmBreeding Zone-II
0.5 cmSiC Insert
1.5 cm FS/He
1.5
cm F
S/H
e
63| | 35
He &
LiP
b M
anifo
lds
Vac
uum
Ves
sel
Gap
Gap
+ T
h. In
sula
tor
Coi
l Cas
e & In
sula
tor
Win
ding
Pac
k
Plas
ma
2 2 302.228
| |Dmin = 139 cm
Exte
rnal
Str
uctu
re
10
SOL
Back
Wal
l
5 17 5
FW
3.8
1.5 cm FS/He
WC
Shi
eld-
I(r
epla
ceab
le)
38W
C S
hiel
d-II
(per
man
ent)
He M
anifo
lds
20
6
Xn through He Access Tubes(3 MW/m2 peak G)
||Thickness
(cm)
ShieldOnlyZone
@ Dmin VV
BlanketShield
Magnet
WC
Shi
eld-
only
or
Tran
sitio
n R
egio
n
Manifolds
Thickness(cm)
Blanket/ShieldZone
| |
Vac
uum
Ves
sel
Gap
Loca
l Shi
eld
Coi
l Cas
e & In
sula
tor
Win
ding
Pac
k
Plas
ma
2 ? 302.228
Dmin > 139 cm
Exte
rnal
Str
uctu
re
10
SOL
B
W
5 17 5
FW
3.8
1.5 cm FS/He
WC
Shi
eld-
I (
repl
acea
ble)
38
W
C S
hiel
d-II
(p
erm
anen
t)
He M
anifo
lds
20D > 181 cm
SOL
Vac
uum
Ves
sel
FS S
hiel
d
3.8
cm F
W
Gap
+ T
h. In
sula
tor
Win
ding
Pac
k
Plas
ma
5 ? ≥228 302.228
Coi
l Cas
e & In
sula
tor
5 cm
BW
Exte
rnal
Str
uctu
re
10
25 cmBreeding
Zone-I
25 cmBreeding Zone-II
0.5 cmSiC Insert
1.5 cm FS/He
1.5
cm F
S/H
e
63| | 35
Man
ifold
s
Loca
l Shi
eld
He Tube(32 cm ID)
He Tube(32 cm ID)
7
Suggestion• To alleviate impact of access tubes on radial build, use LiPb,
instead of He, to cool shield-only zones that cover 5% of FWarea.
• Disadvantages:• WC shield operates at lower temperature fi slightly lower hth
• Advantages:• Lower impact on radial build and overall machine• Less severe streaming problem• Thinner local shield• Lower temperature during LOCA/LOFA
• Question: Could all HT shields be cooled with LiPb? Benefits: more compact nominal radial build, smaller He access
tube, less streaming, and thinner local shields.
8
Nominal, Transition, andShield-only Zones
| | WC-Shield only Zone (5%)
Transition Region (10%)
Nominal Blanket/shieldZone (85%)
Plasma
MagnetVacuum Vessel
WC-Shield-II
WC-Shield-I
Blanket
FS-Shield
FW SOL
Back Wall
Gap
Non-uniformBlanket
LiPb & He Manifolds
417
5
28
35
28
5438 ?
8
13
38
28
Dm
in =
119
cm ?
5 cm
Manifoldsto be added
¨
9
2 Shield-Only Zones Per Field period(3 FP Configuration, R= 8.25 m)
Shield-only zone (green), transition region (blue), and nominalblanket zone cover 5%, 10% and 85% of FW area, respectively
Toroidal Length of Field Period (~18 m)
Polo
idal
Len
gth
of F
ield
Per
iod
(~12
m)
Recommended locationsfor FW He in/out tubes
10
Magnet Cryogenic Heat Load
• Assumptions:• 2 MW/m2 average G• Continuous 4K structure surrounding winding packs• 300 We needed to remove 1 W of nuclear heating
• Roughly estimated 0.014 MW of nuclear heating.
Cryogenic load to remove nuclear heating ~ 4 MWe
Other non-nuclear heat load to magnet?
11
Future Plan
• Check effect of shield LiPb coolant on radial build.
• Post new radial build on UW website:http://fti.neep.wisc.edu/aries-cs/builds/build.html
• Optimize dimensions of local shield behind access tubes andconfirm VV/magnet protection with 3-D analysis.
12
ARIES-CS Publications
Submitted final manuscript to ICFRM-12 conference (Dec 4-9, 205, Santa Barbara):The Feasibility of Recycling and Clearance of Active Materials from FusionPower PlantsM. Zucchetti, L. El-Guebaly, R. Forrest, T. Marshall, N. Taylor, K. Tobita
Published full report as UW FDM:Current Challenges Facing Recycling and Clearance of Fusion Radioactive MaterialsL. El-Guebaly, R. Forrest, T. Marshall, N. Taylor, K. Tobita, M. Zucchetti,Available at: http://fti.neep.wisc.edu/pdf/fdm1285.pdf