design of wide aperture/thin septa of extraction system for j-parc-50gev ring
DESCRIPTION
Design of wide aperture/thin septa of extraction system for J-PARC-50GeV ring. 1. The outline of septa system for 50GeVring 2. Designing of thin septa and medium thin septa for fast/slow extraction. Septa for fast extraction. Number of septa 14 Current 4.0kAmps~6.5kAmps Pattern operation. - PowerPoint PPT PresentationTRANSCRIPT
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Design of wide aperture/thin Design of wide aperture/thin septa of extraction system for septa of extraction system for
J-PARC-50GeV ring J-PARC-50GeV ring 1. The outline of septa system for
50GeVring
2. Designing of thin septa and medium
thin septa for fast/slow extraction
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The extraction septa for 50GeVring
Septa for fast extraction
Number of septa 14Current 4.0kAmps~6.5kAmpsPattern operation
Septa for slow extraction
Number of septa 10
Current 4.5kAmps~5.0kAmps
CD operationLayout of 50GeVring
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Configuration of magnetic septa for slow extraction
Thickness thin septa 1.5mm and 3.5mm Medium thick septa 7.5mm Thick septa 30mm~62mm
Field0.114T0.528T1.4T~1.66T
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Configuration of septa for fast extraction
ThicknessMedium thick septa 9mmThick septa 30mm~62mm
Patten operation 0.17s(FB)+1.9s(Rise)+0.1(Top)+0.87s(Fall)=3.04s
Field0.459T1.38T~1.66T
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The structure of SM10
The septum conductor is touched to the core in order todecrease the leakage flux. The core is laminated core.
Field 0.114TCurrent 5kAmpsMagnet length 1.5m
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Clearance of Beam and septum
Since injection beam is close to core, inner support of septumconductor is adopted.
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The structure of SM11
The conductor is a centipede structure for fixing the coil,The core is laminated core.
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Current 5000ACurrent density 91A/mm2
Generation of heat 18.2kW
WaterWater speed 7m/sTin =25 ℃ Tout=70℃ConductorTw=73℃Tmax =247℃
The heat calculation of SM10
Thickness 1.0mm
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The field calculation of SM10
0
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300
0 10 20 30 40 50 60
Current distribution of edge cooling
I(A)
I(A)
y(mm)
Thickness 1.5mmFlatnessΔB/Bo=0.25% at y=0ΔB/Bo=0.5% at y=13mmLeak fieldLess than 10G
0
500
1000
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2000
-10 -5 0 5 10
Field distribution
By_y=0mmBy_y=13mm
B(G)
x(mm)
I_sus=17.4AI_cu=4982.6A
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50
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300
0 10 20 30 40 50
Temperature distribution of edge cooling
T()
℃
y(mm)
T_peak=122.2℃
T_ave=89.8℃
Current density 60.6A/mm2Generation of heat 9.9kWWater speed 5.7m/sTin 25 Tout 55℃ ℃
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Medium thin septa SM2
Fast extraction Thickness of septum 9mm Bo=0.459TMagnet length 0.875m4 turn
Slow extractionThickness of septum7.5mmBo=0.528TMagnet length 0.875m6turn
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Heat calculation of SM2 4turn (I=7458A) 6turn(I=4972A)
Water speed is too high and it’s dangerous considering cavitation of hollow conductor
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110
6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0
Temperature of water&conductor
T_water( )℃T_conductor( )℃
Tem
pera
ture(
)℃
water speed (m/s)
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7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0
Temperature of water&conductor
T_water( )℃T_conductor( )℃
Tem
pera
ture(
)℃
water speed (m/s)
Size 4.5mmx16.6mmHole φ3mm
Size 4.5mmx11mmHole φ3mm
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Optimization of cooling pipe (thickness 7.5mm)
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95
6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0
Temperature of water&conductor
T_water( )℃T_conductor( )℃
T()
℃
ν (m/s)
The calculated temperature in case of containing stainless steal pipe are shown, When the diameter of pipe is 3.7mm, temperature is minimized. Thickness of pipe are chosen to be 0.3mm.
65.0
70.0
75.0
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85.0
90.0
95.0
2.0 2.5 3.0 3.5 4.0 4.5
Temperature of outlet Water
T_water
T()
℃
φ (mm)
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Test piece of conductor
Conductor size5mmx11mmDiameter of holesφ3mmSilver brazing
In order to reduce the risk of erosion and corrosion,Steel pipes are put into cupper conductor.
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Test piece made by HIP(Hot Isostatic Pressing)
Size 4.5mmx17mmThickness ofStainless pipe is 0.5mm
The two stainless pipes are put into the cupper plate, then added pressing and heat. Finally machining to required shape and dimension.
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Summary
Field calculation of thin septa for slow extraction has performed and obtained a flatness of field within 0.5%.
For the medium thin septa, A test piece of optimized conductor was made for the 6turn coil septum.
Hereafter, R&D test will be done to ensure the fabrication.