Page 239 - DCAP601_SIMULATION_AND_MODELING

Unit 12: Design and Evaluation of Simulation Experiments (II)

I am also disappointed about the implications regarding statements from people not Notes
directly associated with Pokhran-II. This suggests that no experts, anywhere in the world,
are competent to comment on Pokhran-II! This is unscientific.
One doesn’t need to know every detail of the test to make intelligent estimates about the
expected yield, or the crater size. In science, anyone can make a scientific observation, and
it has to be refuted scientifically, and not by mere assertion. Those who are raising these
questions have sufficient knowledge and experience to make those questions pertinent
and relevant.
Searching Questions
Dr Kakodkar also revealed that we have more then one hydrogen bomb in our arsenal,
and that we now have devices with yields ranging from sub-kt to 200 kt.
It must be reassuring to the military to know that the quantity issue has been addressed.
But what is more important is to address the quality issue, about which the military
should also ask searching questions. After all, deterrence is in the eyes of the enemy; it is
not important what a few people assert, but what the whole world thinks.

Overall, I would say that the question mark over the yield and efficacy of the thermonuclear
device, and hence our nuclear deterrent, still remains. Right from the beginning, the
official response to very legitimate questions, raised by those who are knowledgeable
and acting in the best interests of the nation, has been defensive and closed-minded. This
does not augur well for the health of our strategic deterrent. Given the strong support
from the new US administration for the NPT and the CTBT, and the international pressure
that will certainly be put upon India in the near future, this is an issue the Government
must address seriously.

Source: http://www.thehindubusinessline.com/todays-paper/tp-economy/article1071937.ece
12.5 Summary

 Validation of design rules taking into account fine details such as line-edge roughness,
and full chip layout simulation for design inconsistencies, before actual fabrication, are
among the main objectives of current software assisted metrology tools.
 The use of quantitative and qualitative computational models to make quantitative and
qualitative predictions or rather to draw conclusions from complex antecedents, and then
discusses different types of explanation and prediction.
12.6 Keywords

CD: Critical Dimension
IID: Independent and Identically Distributed
LLN: Law of Large Number

w.p.1: with probability one

12.7 Self Assessment

Fill in the blanks:
1. ……………… roughness quantification should accompany Critical Dimension (CD)
measurements since it could be a large fraction of the total CD budget.

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