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Target & Horns Fluxes were distributed. W/ J-PARC type 2.5 o, 2 o, 3 o. Target cooling evaluation and test Target stress analysis Serious stress analysis.

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Presentation on theme: "Target & Horns Fluxes were distributed. W/ J-PARC type 2.5 o, 2 o, 3 o. Target cooling evaluation and test Target stress analysis Serious stress analysis."— Presentation transcript:

1 Target & Horns Fluxes were distributed. W/ J-PARC type 2.5 o, 2 o, 3 o. Target cooling evaluation and test Target stress analysis Serious stress analysis started for 1 st horn consistent w/ simple calculation Optimization of the horns Load test was done w/ mini-1 st horn.

2 Fluxes w/ J-PARC type 2.5 o, 2 o, 3 o.

3 Progress by S.Ueda and Target&Monitor group Required heat convection coefficient btw. water and graphite was evaluated. T surf < 100 o Both  T surf and T water were evaluated. Actual heat convection coefficient was measured. Target cooling Q : ~60kJ/3.3sec. T water T surf water target Q

4 T surf Max. α=6α=6  T surf Required Heat Convection coefficient Q Z=0cm Z=90cm beam ターゲット 水 Result >6.5[kW/Km 2 ]@15l/min >5.8[kW/Km 2 ]@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

5 horn target 90 cm One of cooling schems

6 electrode Cooling water Cooling Test water DC Current

7 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 5  s) 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 (mm) 0 15 slightly larger but consistent with the analytical calculations (analytical calc.: 6.0MPa) (due to the approximation of the temperature distribution) Hayato, Minakawa

8 Further optimization –Horn1- Parameters default Current I320kA Inner conductor radius r in 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

9 Rin = 28 mm L1 = 140cm D2 = 50cm

10 Heat load by radiation to 1 st horn Ver4.8 Rin=23mm, Total : 70kJ/pulse 26mm, Total : 37kJ/pulse 28mm, Total : 35kJ/pulse

11 Time evolution of temperature at inner-condcutor r in =26mm, L1=150cm, w pulse =0.4ms 最高温度部 Asuming  from K2K (Yamanoi et al.)

12 Stress analysis using ANSYS beam 1 st horn Cylindrical model Only stress from Lorenz force is considered. Stress from heat load should be considered. 3mm thick aluminum  eq < 20 MPa Deformation < 60  m

13 I=320kA 3mm thick aluminum  eq < 20 MPa Deformation < 60  m Only stress from Lorenz force  eq < 23 MPa Deformation < 100  m Previous version Rin=26mm Rin=28mm

14 Load Test FSW w/ Yamanoi


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