Target & Horns
• Fluxes were distributed. W/ J-PARC type 2.5o, 2o, 3o.
• Target cooling
evaluation and test
• Target stress analysis
• Serious stress analysis started for 1st horn
consistent w/ simple calculation
• Optimization of the horns
• Load test was done w/ mini-1st horn.
Progress by S.Ueda and Target&Monitor group
• Required heat convection coefficient btw. water and graphite was evaluated . Tsurf < 100o
Both Tsurf and Twater were evaluated.
• Actual heat convection coefficient was measured.
Target cooling
surfwatersurf TSTTSQ )(Q : ~60kJ/3.3sec.
Twater
Tsurf
water
targetQ
Tsurf Max.
α=6
TsurfRequired Heat Convection coefficient
Q
Z=0cmZ=90cm
beam ターゲット水
Result
>6.5[kW/Km2]@15l/min
>5.8[kW/Km2]@20l/min
•Heat deposit onto the water is not yet taken account.
•These are based on simple calculations.
FEM analysis is being carried out.
S.Ueda
Thermal stress estimation (ANSYS)Condition: Simulate the hottest part (z=100mm ~ 200mm) : The edges (z=100 & 200mm) are fixed in z direction.
just after the spill (after 5s)
100 200
Equivalent stress
(Because both of the edges were fixed)
z (mm)
maximum temperature
@ r=0, z=200mm ~14.5MPa.
@ maximum temperature~8.8MPa.
(r=0,z~170mm)
r (m
m)
0
15
slightly larger but consistent with the analytical calculations
(analytical calc.: 6.0MPa)
(due to the approximation of the temperature distribution)
Hayato, Minakawa
Further optimization –Horn1-Parameters default
Current I 320kA
Inner conductor radius rin 26 mm
Horn1 Length L1 1.5 m
Distance to Horn2 D2 0.5 m
Horn2 shape parameter a2 0.609
Horn3 shape parameter a3 0.0661
Fixed Parameters
Horn2 Length L2 2 m
Horn3 Length L3 2.5 m
Total Length 11.5 m
L1 D2 L2 D3 L3
Heat load by radiation to 1st horn
Ver4.8
Rin=23mm, Total : 70kJ/pulse
26mm, Total : 37kJ/pulse
28mm, Total : 35kJ/pulse
Time evolution of temperature at inner-condcutor
図 温度解析結果/内部導体最高温度部の温度履歴
0
10
20
30
40
50
60
70
80
90
0 5 10 15 20 25 30 35 40 45 50
s時間( )
℃温
度(
)
N2702
①
②
③
④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬
rin=26mm, L1=150cm, wpulse=0.4ms
最高温度部
Asuming from K2K (Yamanoi et al.)
Stress analysis using ANSYS
beam
1st horn Cylindrical model
Only stress from Lorenz force is considered.
Stress from heat load should be considered.
3mm thick aluminum
eq < 20 MPa
Deformation < 60m
I=320kA
3mm thick aluminum
eq < 20 MPa
Deformation < 60m
Only stress from Lorenz forceeq < 23 MPa
Deformation < 100m
Previous version
Rin=26mm
Rin=28mm