Post on 23-Dec-2015
Accident scenarios for
MTA beam line
Igor Rakhno
June 8, 2007
The scenarios
• Several spatial locations were examined:
– beam pipe 5 m US the 12-ft sh.block;
– beam pipe 2.5m US the 12-ft sh.block;
– beam stop itself;
– beam pipe inside the 12-ft sh.block, ≈ under the penetrations;
– quad 5 m DS the 12-ft sh.block
• The beam stop in all the cases is in upper position (beam pipe is clear).
• Two penetrations are in the model: coax and rectangular (modeled as circular).
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Plan view @ beam line elevation
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Penetrations: elevation view
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Penetrations: plan view @ elevation of X=370 cm
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Calculated dose in the penetrations @ X=370 cm
Location Dose (mrem/pulse)
Beam pipe 5 m US the 12-ft sh.block 1
Beam pipe 2.5m US the 12-ft sh.block 1
Beam stop itself 1
Beam pipe inside the 12-ft sh.block 25
Quad 5 m DS the 12-ft sh.block 240
There is no cross-talk between the penetrations, so that we have
two spots 240 mrem/pulse each, not one spot 480 mrem/pulse.
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Accident on quad; plan view @ X=370 cm
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Accident inside the 12-ft block
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