Beam dump
for J-Parc neutrino facility
Requirement
For the 1st phase: accept 0.75 MW beam
For the 2nd phase : accept 4MW beam
Heat Load
Among total beam power, 20% is deposited at dump.
Radiation shielding
11mSv/h at the boundary of concrete and soil
0.25mSv/h at the surface of soil
Muon Monitor
monitor the direction and intensity of the beam
Thickness required for radiation shielding
μピット
3.50
A
Top View
The amount and shape
2,000
10,000
19,500
3.50
4.00
4,500
2.50
8.00
5,000
μピット測定室
(コンテナ)
2.50
5,100
3.00
of iron should be optimized.
この辺にドア
4,000
μピット機械室
(半地下)
汚染検査室
8,000
3,600
Front View
A
Side View
A-A断面図
4000(こんなに大きくなくて良い)
6.83
19.63
GL(=TP+6.2m)
遮蔽ブロック
10.80
2.50
21,900
20,700
3.50
遮蔽ブロック
(こんなに分厚い
必要はない)
700
8,200
2,100
2.50
5.80
17.80
700
3.50
5,000
1,200
FL=TP-14.3
μピット２
5,000
15,500
3.50
3.00
4.00
7.00
要排水ピット
Heat load from radiation
At x=0 plane
unit: J/cm3/pulse
1030-1080(50)
980-1030(50)
930-980(50)
880-930(50)
830-880(50)
772-830(58)
714-772(58)
656-714(58)
598-656(58)
540-598(58)
482-540(58)
424-482(58)
366-424(58)
308-366(58)
250-308(58)
200-250(50)
150-200(50)
100-150(50)
50-100(50)
y=0-50(50cm)
z=0-1m
0
0
3.32E-07
1.69E-05
1.37E-03
0
0
0
0
0
0
0
0
0
0
1.43E-04
1.21E-07
0
0
0
1-2m
0
0
0
1.73E-06
2.86E-04
0
0
0
0
0
0
0
0
0
0
4.12E-04
3.09E-05
1.17E-05
0
0
2-3m
0
0
8.92E-06
4.61E-07
3.62E-04
0
0
0
0
0
0
0
0
0
0
1.14E-03
4.21E-07
5.94E-06
0
0
3-4m
0
0
0
3.86E-05
2.82E-04
6.29E-02
0.1422
0.32686
0.57322
0.55168
0.36446
0.18021
8.79E-02
6.10E-02
4.51E-02
6.57E-04
9.10E-07
0
0
0
4-5m
0
0
0
8.07E-06
9.66E-05
7.61E-03
2.82E-02
7.17E-02
0.1335
0.12551
8.73E-02
4.27E-02
1.51E-02
1.15E-02
5.53E-03
3.55E-04
4.47E-07
5.26E-10
0
0
5-6m
0
0
0
0
0
1.64E-04
1.12E-03
3.60E-03
8.70E-03
6.23E-03
3.71E-03
2.49E-03
8.49E-04
4.40E-04
1.62E-04
1.78E-06
0
0
0
0
6-7m
0
0
0
0
6.27E-09
5.88E-08
4.42E-06
2.64E-05
1.51E-04
8.04E-05
9.94E-05
9.14E-05
6.60E-05
0
1.55E-05
0
0
0
0
0
Example of Heat Analysis(4MW)
½ Model
Boundary condition
(All) outer surface of the iron is
cooled by water.
concrete
Temperature distribution in Iron
700.6
beam
iron
Z
Y
X
Y
12.
9.
6.
3.
0.
-3.
0.
3.
6.
9.
12.
15.
18.
21.
24.
27.
30.
658.7
X
616.8
33.
574.9
533.
491.1
449.2
407.2
soil
365.3
323.4
281.5
Result
239.6
197.7
Max. in iron : 700oC
155.8
Z
-> need aluminum plate or something
in concrete : 54oC
Y
113.9
X
Output Set: Steady state result
Contour: Temperature
71.95
30.04
Muon monitor
Monitoring of the beam direction and intensity.
Threshold 8 GeV/c ? Probably 5 GeV/c is preferable…
(under study)
To achieve 5 GeV/c threshold, the monitor has to be installed
between irons under high radiation condition.

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