SnowMass Preparation 2122013 J Van Nugteren We want a new 20T Dipole Higher energies to f ind new fundamental physics So we can improve our understanding of the universe we live in ID: 233610
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Slide1
Concepts for 20 T dipoles
SnowMass Preparation 21-2-2013
J. Van
NugterenSlide2
We want a new 20T Dipole
Higher energies to find new fundamental physics
So we can improve our understanding of the universe we live in
However development of such a magnet will take some time
Therefore we need to start thinking nowMany ideas ‘floating’ aroundMany new technologies such as HTSAssignment: make first steps within context EUCARD I/II
2
(Wallpapers NASA)Slide3
Development Plan3
Started
November 2012
in the framework of
PhDWork far from completeCompare all (or most relevant) designs/layoutsBoundariesIron influenceWith – gain 2 T for single aperture
Without – B distribution modifiedActive shielding?Conductor
Existing performanceFuture extrapolated performance -> to prospect ultimate possibilitiesField qualityNot too much focus on field quality yet. Because winding pack is thick, it can be corrected for later.Slide4
Making a Fair Comparison4
All designs/layouts must follow same set of rules
20 T operating field
same
critical surfaces for conductorsame operating points (80%Ic)same operating temperature (1.9 K)same free bore (40 mm)same assumptions on how to deal with forcessame shielding/iron
Compare in terms of Forces and stresses in coilAmount of conductor
FeasibilityNeed to watch out to compare also to some designs of different groups.Slide5
Design Options5
Configuration per LayerCos-Theta
Block
Canted Cos-Theta
Perhaps other
Full Cos-Theta
Full Block
Canted Cosine Theta (CCT)Slide6
Design Options6
Conductor per LayerNbTi
Nb3Sn
YBCO
(fieldangle)BSCCO (stresses)CablesRutherford
RoebelCorkOther?
One or multiple power supplies?
1
o
5
o
10
o
20
o
Miyoshi Measurement Data
Godeke
Scaling Relation
Bottura
Scaling relation
McIntyre
J
c
[A/mm
2
]
|B| [T]Slide7
Pocket Sized
Coil Optimizer
7
New iterative 2D magnet optimization tool
no
yes
Convergence Reached (:
Post processing
Start
Load input coils
Breq
α
1
α
2
α
3
α
4
Breq
J
J
J
J
J
JSlide8
Pocket Sized
Coil Optimizer
8
Provides playground to create many coil designs (following
the rules) for comparisonAt present we have studied YBCO insert, single aperture only to test the code
Ultimate goal is to create comparative tables with many design options for dual aperture
Already provided us with some ideas …Slide9
Idea 1 – Angle optimization for YBCO9
The critical current of YBCO tapes/cables
is highly dependent on the incident
angle
of the magnetic fieldEffect becomes stronger at higher fieldsBecause of this for presently available YBCO, only designs with good field angle inside the insert turn out to be feasible
2 T
20 TSlide10
Idea 1 – angular optimization
10For example -
Normal
Block CoilSlide11
Idea 1 – angular optimization11
Insert: Crystalized
Block Coil
//
Sharded Block CoilHow to make the ends? (Need 3D model)Slide12
Idea 2 - Active Shielding12
20 T magnet would require massive iron
yoke
Therefore
it was decided to look also at active shield coilsLess weightMore compactHoweverInstead of gaining field you lose fieldThere is something called Blooming Field
EffectSlide13
Idea 2 - Active Shielding
13Single aperture – no shield
5 Gauss
50 Gauss
R=16 m
Note that for the dual aperture
case, the result is different
(this is an exercise)Slide14
Idea 2 - Active Shielding
14Single aperture – 1 shield block
5 Gauss
50 Gauss
R=1.5 m
Requires approximately 10-15% extra conductorSlide15
Idea 2 - Active Shielding
15Single aperture – 2 shield blocks
5 Gauss
50 Gauss
R=0.9mSlide16
Idea 2 – Dual aperture active shield?
16Dual aperture gives
quadrupole
stray field
Artistic impression of possible shield layoutYet to be researched
+
+
-
-
+
+
+
+
-
-
-
-
\
\
\Slide17
Yet to be done17
Two-in-One aperture (and its shielding)Iron including
saturation
Coil ends in 3D
modelsDesigns with BSCCOMechanicsQuench BehaviourSlide18
Thank you for your
kind attention18Slide19
19Slide20
PSCO – Simply Nesting Layers
Types of layersSector (cosine theta, helical, …)Block (block coil)Nesting conditions (in/out)
wallin
wallout
radiusinradiusoutradiuscenbeampipebeampipe_sqe
beampipe_sqomoving
20