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- Q2600764 subject Q7166631.
- Q2600764 abstract "Variable yield—or dial-a-yield—is an option available on most modern nuclear weapons. It allows the operator to specify a weapon's yield, or explosive power, allowing a single design to be used in different situations. For example, the Mod-10 B61 bomb had selectable explosive yields of 0.3, 5, 10 or 80 kilotons, depending on how the ground crew set a dial inside the casing when it was loaded onto an aircraft.Variable yield technology has existed since at least the early 1960s. Examples of variable yield weapons include the B61 nuclear bomb family, B83, W80, W85, and WE177A warheads.Most modern nuclear weapons are Teller–Ulam design type thermonuclear weapons, with a fission primary stage and a fusion (or fission) secondary stage which is collapsed by the energy from the primary. These offer at least three methods to vary yield: Varying primary yield by boosting with fusion, using small amounts of deuterium / tritium gas inside the primary fission bomb to increase its yield. Typically, the tritium gas is injected a few seconds before detonation and the amount used can be preset e.g. zero, 25%, 50% or all of the gas. Changing the primary yield by varying the timing or use of external neutron initiators (ENIs). These are small particle accelerators that cause a brief fusion reaction by accelerating deuterium into a tritium target (or potentially vice versa), producing a short pulse of energetic neutrons. Precise timing of the ENI pulse as the nuclear primary's pit is collapsing can significantly affect yield, and the rate of neutron injection can also be controlled. Shutting down the thermonuclear secondary, either by firing the primary at low enough yield that it does not compress the secondary sufficiently to ignite, or by blocking energy transport inside the warhead briefly as the primary is firing using shutters or a similar mechanism. If the primary's energy starts to disperse through the radiation case before being focused on the secondary then the secondary will likely never detonate.All current British nuclear warheads incorporate variable yield technology as standard.".
- Q2600764 wikiPageExternalLink www.nuclearweaponarchive.org.
- Q2600764 wikiPageWikiLink Q102296.
- Q2600764 wikiPageWikiLink Q11429.
- Q2600764 wikiPageWikiLink Q1144974.
- Q2600764 wikiPageWikiLink Q1189039.
- Q2600764 wikiPageWikiLink Q12246375.
- Q2600764 wikiPageWikiLink Q12802.
- Q2600764 wikiPageWikiLink Q13082.
- Q2600764 wikiPageWikiLink Q15221814.
- Q2600764 wikiPageWikiLink Q1987562.
- Q2600764 wikiPageWikiLink Q2750037.
- Q2600764 wikiPageWikiLink Q2909689.
- Q2600764 wikiPageWikiLink Q3062538.
- Q2600764 wikiPageWikiLink Q54389.
- Q2600764 wikiPageWikiLink Q625107.
- Q2600764 wikiPageWikiLink Q7166631.
- Q2600764 wikiPageWikiLink Q795321.
- Q2600764 wikiPageWikiLink Q795325.
- Q2600764 comment "Variable yield—or dial-a-yield—is an option available on most modern nuclear weapons. It allows the operator to specify a weapon's yield, or explosive power, allowing a single design to be used in different situations. For example, the Mod-10 B61 bomb had selectable explosive yields of 0.3, 5, 10 or 80 kilotons, depending on how the ground crew set a dial inside the casing when it was loaded onto an aircraft.Variable yield technology has existed since at least the early 1960s.".
- Q2600764 label "Variable yield".