How does the Tamper in a nuclear bomb survive?

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Discussion Overview

The discussion revolves around the function and survival of the tamper in a nuclear bomb during detonation. Participants explore the mechanics of how the tamper interacts with the shock waves generated by conventional explosives and its role in achieving critical mass for a nuclear chain reaction.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions why the tamper does not get destroyed by the shock waves from the conventional explosives, suggesting that if the blast is powerful enough to achieve critical mass, the tamper material should also be destroyed.
  • Another participant asserts that the compression occurs very quickly, implying that the rapidity of the process may allow the tamper to function effectively despite the destructive forces.
  • Some participants propose that the tamper is mechanically destroyed but still fulfills its purpose by moving inward, contributing to the compression of the fissile material.
  • A later reply emphasizes that while the tamper may be destroyed, its momentum is crucial and cannot be negated, suggesting that the concept of momentum plays a significant role in the tamper's effectiveness.

Areas of Agreement / Disagreement

Participants generally agree that the tamper is destroyed mechanically but debate the implications of this destruction on its effectiveness. Multiple views on the mechanics of the tamper's role and the nature of the forces involved remain present.

Contextual Notes

There are unresolved aspects regarding the specific materials used for the tamper and their properties under extreme conditions, as well as the precise mechanics of the shock wave interaction.

gvlr96
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I can't really explain my query fully in the space of a title but after hearing an explanation about how nuclear bombs work there is one thing I don't understand - the fissile material is in the centre, around that is the neutron deflector and around that the conventional explosives (this is probably a simplification). The shock waves from the conventional explosives must squeeze the fissile material to critical mass to trigger the chain reaction, but the shock wave must travel through the tamper first. Why is the tamper not destroyed? If the blast is powerful enough to cause critical mass surely any material used for the tamper would not survive?
 
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It all gets compressed. The time involved is very short.
 
The tamper gets destroyed mechanically - it doesn't matter, as long as it moves inwards it serves its purpose.
 
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mfb said:
The tamper gets destroyed mechanically - it doesn't matter, as long as it moves inwards it serves its purpose.

So it gets destroyed but still can do its job - thank you.
 
gvlr96 said:
So it gets destroyed but still can do its job - thank you.
The momentum of the tamper does the job. A structure can be destroyed; momentum can not be.
 

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