Document Details


Title:
LOS ALAMOS SCIENTIFIC LABORATORY OF THE UNIVERSITY OF CALIFORNIA LOS ALAMOS NEW MEXICO - THEORY OF THE FIREBALL ( REPORT WRITTEN: FEB 1964, REPORT DISTRIBUTED: JUNE 17, 1964 )
Author(s):
BETHE, H A [LOS ALAMOS SCIENTIFIC LABORATORY]
Document Location:
Location - NNSA/NSO Nuclear Testing Archive Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - CIC@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1964 Jun 17
Declassification Status:
Never classified
Document Pages:
0083
Accession Number:
NV0067751
Document Number(s):
LA3064
Originating Research Org.:
LOS ALAMOS SCIENTIFIC LABORATORY
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
THE SUCCESSIVE STAGES OF THE FIREBALL DUE TO A NUCLEAR EXPLOSION IN AI R ARE DEFINED ( SEC. 2 ). THIS PAPER IS CHIEFLY CONCERNED WITH STAGE C , FROM THE MINIMUM IN THE APPARENT FIREBALL TEMPERATURE TO THE POINT W HERE THE FIREBALL BECOMES TRANSPARENT. IN THE FIRST PART OF THIS STAGE (C I ), THE SHOCK (WHICH PREVIOUSLY WAS OPAQUE) BECOMES TRANSPARENT D UE TO DECREASING PRESSURE. THE RADIATION COMES FROM A REGION IN WHICH THE TEMPERATURE DISTRIBUTION IS GIVEN BY THE CONDITION THAT THE MEAN F REE PATH IS ABOUT 1/50 OF THE RADIUS (SEC. 3). THE RADIATING TEMPERATU RE DUING THIS STAGE INCREASES ABOUT AS P-1/4, WHERE P IS THE PRESSURE. TO SUPPLY THE ENERGY FOR THE RADIATION, A COOLING WAVE PROCEEDS FROM THE OUTSIDE INTO THE HOT INTERIOR (SEC.5). WHEN THIS WAVE REACHES THE ISOTHERMAL SPHERE, THE TEMPERATURE IS CLOSE TO ITS SECOND MAXIMUM. THE REAFTER, THE CHARACTER OF THE SOLUTION CHANGES; IT IS NOW DOMINATED BY THE COOLING WAVE (STAGE C II). THE TEMPERATURE WOULD DECREASE SLOWLY (AS P1/6) IF THE PROBLEM WERE ONE-DIMENSIONAL, BUT IN FACT IT IS PROBA BLY NEARLY CONSTANT FOR THE THREE-DIMENSIONAL CASE (SEC.6). THE RADIAT ING SURFACE SHRINKS SLOWLY. THE COOLING WAVE EATS INTO THE ISOTHERMAL SPHERE UNTIL THIS IS COMPLETELY USED UP. THE INNER PART OF THE ISOTHER MAL SPHERE, I.E., THE PART WHICH HAS NOT YET BEEN REACHED BY THE COOLI NG WAVE, CONTINUES TO EXPAND ADIABATICALLY; IT THEREFORE COOLS VERY SL OWLY AND REMAINS OPAQUE.


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