The short march to China’s hydrogen bomb

Bulletin, April 11, 2024. (very lengthy historic and technical detail. Good graphics)

On December 28, 1966, China successfully conducted its first hydrogen bomb test—only two years and two months after the successful explosion of its first atomic bomb. In so doing, China became the fastest among the five initial nuclear-weapon states (the United States, Russia, China, the United Kingdom, and France, collectively known as P5) to pass from its first atomic bomb explosion to a first hydrogen bomb detonation.

There is still very limited knowledge in Western literature about how China built its first H-bomb. Based on newly available information—including Chinese blogs, memoirs, and other publicly available publications—this account reconstructs the history of how China made a breakthrough in understanding hydrogen bomb principles and built its first H-bomb—without foreign help.

Beyond the previously untold story of China’s early exploration of the hydrogen bomb theory, the article also explores in detail the so-called “100 days in Shanghai”—a milestone of China’s hydrogen bomb development—and describes the efforts that led to a series of three nuclear tests that happened in 1966 and 1967 and that are often called “the trilogy” of the H-bomb development in China.

Early explorations

Moscow’s broken promise

China officially started its nuclear weapon program on January 15, 1955.[1] About two years later, China and the Soviet Union signed the New Defense Technical Accord in Moscow. Under that agreement, Moscow would provide Beijing with a prototype of an atomic bomb model and relevant technical materials. In June 1959, however, as many major relevant facilities in the Chinese nuclear weapon program were at the peak of construction, Soviet-Sino relations deteriorated,[2] and Moscow sent a letter to Beijing formally announcing it would not provide the promised model and data. From the second half of 1959 onward, the Second Ministry of Machine Building Industry—China’s government ministry overseeing the nuclear industry—followed central government policy and relied on the country’s own capabilities to complete the task of developing the atomic bomb.[3]

In early 1960, the weaponeers of the Beijing institute of nuclear weapon research—called the Ninth Institute and placed under the leadership of the Second Ministry[4]—started to explore atomic bomb science and technology. As those weaponeers started working hard on the atomic bomb program, then-Minister of the Second Ministry Liu Jie began considering ways to conduct the nation’s hydrogen bomb development. ……………………………………………………………………………………………………………………………………………………………………………………………………………………………

On January 7, 1965, Liu Jie delivered a speech at the meeting of the Second Ministry, conveying Mao’s new instructions to the audience: “If we have hydrogen bombs and missiles, wars may not be fought, and peace will be more secure. We make the atomic bombs but will not be too many. It will be used to scare [enemies] and embolden [ourselves].” Mao also said that “it still needs three years to have the hydrogen bomb, which is too slow.” [23]

……………………………………… On February 3, 1965, the Second Ministry set the goal of testing the first hydrogen bomb device in 1968.[25]………………………………………………

…………………From February 1965 onward, the weaponeers tried different routes and proposed different ideas, but none was successful. ………………………………………………………………………

Gathering in Shanghai

In late September 1965, Yu Min and over 50 researchers gathered in Shanghai for what may have been the most intense period in the development of the hydrogen bomb………………….

……………………………….For nearly 100 days—and nights—all the physicists, mathematicians, and research assistants gathered in Shanghai would arrange shifts and take turns in the computer room around the clock to solve problems.[43]

…………………………………………………………………………….The group in Shanghai also continued the optimization design work of the boosted three-phase hydrogen aerial bomb.

Finally, in early January 1966, the researchers returned to Beijing with the new hydrogen bomb principle they had sought so hard for nearly 100 days and nights in Shanghai.

Testing the Bomb

………………………………………………..A new two-year plan included preparations for three nuclear tests that aimed for a breakthrough in confirming the H-bomb principle.

………………………….Low-yield hydrogen bomb (device 629).………………………………………………………………………………………………On December 28, 1966, the hydrogen bomb device 629-1 successfully exploded.[70] 

………………..Third test: Full-yield hydrogen bomb (device 639)

…………………………………………………………………………………………..On June 17, 1967, China successfully conducted its first hydrogen bomb (device 639) air-burst test, which was coded operation 21-73……………………………..
more https://thebulletin.org/2024/04/the-short-march-to-chinas-hydrogen-bomb/?utm_source=Newsletter&utm_medium=Email&utm_campaign=MondayNewsletter04152024&utm_content=NuclearRisk_ChinaHydrogenBomb_04112024

April 17, 2024 - Posted by Christina Macpherson | China, weapons and war