Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Attention ESVA patrons:

The Emilio Segrè Visual Archives’ site is moving soon and adopting an open access approach to digital image sharing. Once we have transitioned to the new site in 2021, we will no longer charge for our high-resolution digital images or usage fees (note that we do not hold copyright to all the images in our collections and you will still need to obtain permission for those which we do not own).

If you are working on a long-term project, we advise you to wait until the migration is complete so that you may obtain our copies for free. If you cannot wait, email us at nbl [at] aip.org and we will do what we can to assist you. We will not be offering refunds for past purchases.

For more information, please visit our FAQ page on the Ex Libris Universum blog. 

Fermilab F8

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Fermilab F8

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We charge a usage fee per photo if the photo is published, reproduced in a product or publicly exhibited. This is not a license in the legal sense. As a non-profit institution, we do not make any money providing these photographs. It is only by assessing usage fees that we are able to cover the cost of providing publication quality copies of our photos, preserving the photograph collection according to archival standards, and providing access to the collection by maintaining an online image database. The copyright holder may charge a fee in addition to our service fee.

Images are for use in educational projects only and must be used in a respectful manner.

Image title: 
View of the tunnel which comprises the 'Main Ring' at Fermi National Accelerator Laboratory
Credit line: 
Fermilab Photograph, courtesy of AIP Emilio Segrè Visual Archives

This is a view of the tunnel which comprises the 'Main Ring.' The proton beam travels in a vacuum tube 2 inches by 5 inches located in the center of 1,014 magnets which bend and focus the beam as it travels around the four-mile ring 50,000 times per second. On each revolution, the beam is given a 2.8 million electron volt 'kick' by the radio frequency system, elevating energy to 200 billion electron volts (BeV) or higher. The machine operates regularly at 400 BeV, and has been accelerated to 500 BeV. Cooling water passes through the pipes above, and at the end of the magnets.

Original format: 
1 photographic print (color; 7.5 x 7.5 inches)
Fermi National Accelerator Laboratory