Trinity

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[[File:JRO.jpg|right|thumb|J. Robert Oppenheimer, one of my scientific heroes]]

[[File:Fermi.jpg|right|thumb|Enrico Fermi, my other great scientific hero]]

Time: 0529:45. The firing circuit closed; the X-unit discharged; the detonators at thirty-two detonation points simultaneously fired; they ignited the outer lens shells of Composition B; the detonation waves separately bulged, encountered inclusions of Baratol, slowed, curved, turned inside out, merged to a common inward-driving sphere; the spherical detonation wave crossed into the second shell of solid fast Composition B and accelerated; hit the wall of dense uranium tamper and became a shock wave and squeezed, liquefying, moving through; hit the nickel plating of the ~~pluto-nium~~ core and squeezed, the small sphere shrinking, collapsing into itself, becoming an eyeball; the shock wave reaching the tiny initiator at the center and swirling through its designed irregularities to mix its beryllium and polonium; polonium alphas kicking neutrons free from scant atoms of beryllium: one, two, seven, nine, hardly more neutrons drilling into the surrounding plutonium to start the chain reaction. Then fission multiplying its prodigious energy release through eighty generations in millionths of a second, tens of millions of degrees, millions of pounds of pressure. Before the radiation leaked away, conditions within the eyeball briefly resembled the state of the universe moments after its first primordial explosion.

[[File:Trin2.jpg|right|thumb|Trinity test, T+0.016ms. 18 kilotons. Dropped a gem on 'em.]]

Time: 0529:45. The firing circuit closed; the X-unit discharged; the detonators at thirty-two detonation points simultaneously fired; they ignited the outer lens shells of Composition B; the detonation waves separately bulged, encountered inclusions of Baratol, slowed, curved, turned inside out, merged to a common inward-driving sphere; the spherical detonation wave crossed into the second shell of solid fast Composition B and accelerated; hit the wall of dense uranium tamper and became a shock wave and squeezed, liquefying, moving through; hit the nickel plating of the plutonium core and squeezed, the small sphere shrinking, collapsing into itself, becoming an eyeball; the shock wave reaching the tiny initiator at the center and swirling through its designed irregularities to mix its beryllium and polonium; polonium alphas kicking neutrons free from scant atoms of beryllium: one, two, seven, nine, hardly more neutrons drilling into the surrounding plutonium to start the chain reaction. Then fission multiplying its prodigious energy release through eighty generations in millionths of a second, tens of millions of degrees, millions of pounds of pressure. Before the radiation leaked away, conditions within the eyeball briefly resembled the state of the universe moments after its first primordial explosion.

Then expansion, radiation leaking away. The radiant energy loosed by the chain reaction is hot enough to take the form of soft X rays; these leave the physical bomb and its physical casing first, at the speed of light, far in front of any mere explosion. Cool air is opaque to X rays and absorbs them, heating; "the very hot air," Hans Bethe writes, "is therefore surrounded by a cooler envelope, and only this envelope" - hot enough at that - "is visible to observers at a distance." The central sphere of air, heated by the X rays it absorbs, reemits lower-energy X rays which are absorbed in turn at its boundaries and reemitted beyond. By this process of downhill leapfrogging, which is known as radiation transport, the hot sphere begins to cool itself. When it has cooled to half a million degrees - in about one ten-thousandth of a second - a shock wave forms that moves out faster than radiation transport can keep up. "The shock therefore separates from the very hot, nearly isothermal [i.e., uniformly heated] sphere at the center," Bethe explains. Simple hydrodynamics describes the shock front: like a wave in water, like a sonic boom in air. It moves on, leaving behind the isothermal sphere confined within its shell of opacity, isolated from the outside world, growing only slowly by radiation transport on this millisecond scale of events.

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To Hans Bethe at Compania Hill "it looked like a giant magnesium flare which kept on for what seemed a whole minute but was actually one or two seconds."

Serber at Compania Hill risked blindness but glimpsed an earlier stage of the ~~firebalclass="underline"~~

Serber at Compania Hill risked blindness but glimpsed an earlier stage of the fireball:

<blockquote>At the instant of the explosion I was looking directly at it, with no eye protection of any kind. I saw first a yellow glow, which grew almost instantly to an overwhelming white flash, so intense that I was completely blinded… By twenty or thirty seconds after the explosion I was regaining normal vision… The grandeur and magnitude of the phenomenon were completely breathtaking.</blockquote>

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The successful director of the Los Alamos bomb laboratory left with Farrell in a jeep. Rabi watched him arrive at Base Camp and saw a change:

<blockquote>He was in the forward bunker. When he came back, there he was, you know, with his hat. You've seen pictures of Robert's hat. And he came to where we were in the headquarters, so to speak. And his walk was like "High Noon" - I think it's the best I could describe it - this kind of strut. He'd done it.</blockquote>

<blockquote>He was in the forward bunker. When he came back, there he was, you know, with his hat. You've seen pictures of Robert's hat. And he came to where we were in the headquarters, so to speak. '''And his walk was like "High Noon" - I think it's the best I could describe it - this kind of strut. He'd done it.'''</blockquote>

==See Also==

* [[Nuclear weapons]]

* [[Rutherford]]

Trinity: Difference between revisions

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@@ Line 1: / Line 1: @@
 [[File:JRO.jpg|right|thumb|J. Robert Oppenheimer, one of my scientific heroes]]
 [[File:Fermi.jpg|right|thumb|Enrico Fermi, my other great scientific hero]]
-Time: 0529:45. The firing circuit closed; the X-unit discharged; the detonators at thirty-two detonation points simultaneously fired; they ignited the outer lens shells of Composition B; the detonation waves separately bulged, encountered inclusions of Baratol, slowed, curved, turned inside out, merged to a common inward-driving sphere; the spherical detonation wave crossed into the second shell of solid fast Composition B and accelerated; hit the wall of dense uranium tamper and became a shock wave and squeezed, liquefying, moving through; hit the nickel plating of the pluto-nium core and squeezed, the small sphere shrinking, collapsing into itself, becoming an eyeball; the shock wave reaching the tiny initiator at the center and swirling through its designed irregularities to mix its beryllium and polonium; polonium alphas kicking neutrons free from scant atoms of beryllium: one, two, seven, nine, hardly more neutrons drilling into the surrounding plutonium to start the chain reaction. Then fission multiplying its prodigious energy release through eighty generations in millionths of a second, tens of millions of degrees, millions of pounds of pressure. Before the radiation leaked away, conditions within the eyeball briefly resembled the state of the universe moments after its first primordial explosion.
+[[File:Trin2.jpg|right|thumb|Trinity test, T+0.016ms. 18 kilotons. Dropped a gem on 'em.]]
+Time: 0529:45. The firing circuit closed; the X-unit discharged; the detonators at thirty-two detonation points simultaneously fired; they ignited the outer lens shells of Composition B; the detonation waves separately bulged, encountered inclusions of Baratol, slowed, curved, turned inside out, merged to a common inward-driving sphere; the spherical detonation wave crossed into the second shell of solid fast Composition B and accelerated; hit the wall of dense uranium tamper and became a shock wave and squeezed, liquefying, moving through; hit the nickel plating of the plutonium core and squeezed, the small sphere shrinking, collapsing into itself, becoming an eyeball; the shock wave reaching the tiny initiator at the center and swirling through its designed irregularities to mix its beryllium and polonium; polonium alphas kicking neutrons free from scant atoms of beryllium: one, two, seven, nine, hardly more neutrons drilling into the surrounding plutonium to start the chain reaction. Then fission multiplying its prodigious energy release through eighty generations in millionths of a second, tens of millions of degrees, millions of pounds of pressure. Before the radiation leaked away, conditions within the eyeball briefly resembled the state of the universe moments after its first primordial explosion.
 Then expansion, radiation leaking away. The radiant energy loosed by the chain reaction is hot enough to take the form of soft X rays; these leave the physical bomb and its physical casing first, at the speed of light, far in front of any mere explosion. Cool air is opaque to X rays and absorbs them, heating; "the very hot air," Hans Bethe writes, "is therefore surrounded by a cooler envelope, and only this envelope" - hot enough at that - "is visible to observers at a distance." The central sphere of air, heated by the X rays it absorbs, reemits lower-energy X rays which are absorbed in turn at its boundaries and reemitted beyond. By this process of downhill leapfrogging, which is known as radiation transport, the hot sphere begins to cool itself. When it has cooled to half a million degrees - in about one ten-thousandth of a second - a shock wave forms that moves out faster than radiation transport can keep up. "The shock therefore separates from the very hot, nearly isothermal [i.e., uniformly heated] sphere at the center," Bethe explains. Simple hydrodynamics describes the shock front: like a wave in water, like a sonic boom in air. It moves on, leaving behind the isothermal sphere confined within its shell of opacity, isolated from the outside world, growing only slowly by radiation transport on this millisecond scale of events.
@@ Line 28: / Line 29: @@
 To Hans Bethe at Compania Hill "it looked like a giant magnesium flare which kept on for what seemed a whole minute but was actually one or two seconds."
-Serber at Compania Hill risked blindness but glimpsed an earlier stage of the firebalclass="underline"
+Serber at Compania Hill risked blindness but glimpsed an earlier stage of the fireball:
 <blockquote>At the instant of the explosion I was looking directly at it, with no eye protection of any kind. I saw first a yellow glow, which grew almost instantly to an overwhelming white flash, so intense that I was completely blinded… By twenty or thirty seconds after the explosion I was regaining normal vision… The grandeur and magnitude of the phenomenon were completely breathtaking.</blockquote>
@@ Line 81: / Line 82: @@
 The successful director of the Los Alamos bomb laboratory left with Farrell in a jeep. Rabi watched him arrive at Base Camp and saw a change:
-<blockquote>He was in the forward bunker. When he came back, there he was, you know, with his hat. You've seen pictures of Robert's hat. And he came to where we were in the headquarters, so to speak. And his walk was like "High Noon" - I think it's the best I could describe it - this kind of strut. He'd done it.</blockquote>
+<blockquote>He was in the forward bunker. When he came back, there he was, you know, with his hat. You've seen pictures of Robert's hat. And he came to where we were in the headquarters, so to speak. '''And his walk was like "High Noon" - I think it's the best I could describe it - this kind of strut. He'd done it.'''</blockquote>
 ==See Also==
 * [[Nuclear weapons]]
 * [[Rutherford]]