To: LoLoLoLita who wrote (558 ) 5/14/1998 12:21:00 PM From: Mohan Marette Respond to of 12475
David: here is a bit more news on the technical stuff. Lifted from Economic Times. -------------------------------------------------------------------- Test data put India on par with nuclear top guns S Chandrashekar ---------------------------------------------------------------------- NEW DELHI 13 MAY WITH the five tests, India now probably has enough data to be on par with US, UK and France to be able to carry out computer simulations of varying sizes of nuclear devices, from thermonuclear down to small field devices such as those loaded on shoulder fired weapons. US labs have been performing such simulations for less than a decade while UK and France are in a data exchange pact with US to carry out simulations. China is currently in talks with the US for data exchange after their 1996 n-tests prior to the CTBT signature. While the first batch of tests conducted on May 11 included a thermonuclear device, a hydrogen bomb of some size, the second series of 'sub-kiloton' tests on May 13 may have been meant for testing field devices launched from shoulder-held weapons.The sub-kiloton tests yield typically two to 500 tons of TNT equivalent. Atomic energy experts say intensities up to one to two kiloton are two weak to be detected by remote seismograms. Seismograms record seismic data which are recording of tremors set off by an n-test, similar to ones following an earthquake. Kiloton estimates made this way have begun pouring in from all over the world from a network of seismographic stations. Measurements by US scientists show the first test strength to be between 30 to 40 kilotons. Japanese scientists have recorded 20 to 30 kilotons. In India, the Gauribidanur seismic array station of BARC recorded Pokharan nuclear tests at around 55 kilotons. The nature of the waves recorded at Gauribidanur (and seismic stations the world over too) was complex because of simultaneous tests and yielded one number instead of three discrete ones. It is unclear to Dr P K Iyengar, former chairman of the Atomic Energy Commission and now an outside observer of the nuclear programme, the plan to conduct first three tests simultaneously.After the data is collected on pressure and seismic waves and radioactivity, the future designs of devices can be carried out. As these are typically high volume calculations, computers are useful. Also, India can now perform sub-critical experiments which involve physical testing of only the non-nuclear parts of the device and doing the final testing along with the fissile core on the computer. Dr Iyengar says it is a myth that one needs enormous computing power to work out these simulations. He said what one needs is good physics. While describing the event as a proud one, Dr Iyengar said preparations have been on for the past two decades. Its only that the political sanctions to conduct the n-tests came now.