An Investigation of low beta triplet vibrational issues at Fermilab's Collider Detector Page: 3 of 9
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1.3. Low Beta System
The low beta triplet which is comprised of magnets: Q2, Q3 and Q4 is found on both sides of the
CDF Collision Hall as shown in Figure 2. Low beta is defined as emittance or cross-section of
the beam. The Q3 and Q4 magnets are suspended 4.5 m above the floor and 5.4 m from the
ceiling within a girder. The other ledge mount-type support location exists within an alcove
upstream (Figure 3). Steel shielding which is 40 cm thick in each direction encloses the girder
and protects CDF from radiation longitudinally stemming from the Tevatron. The girder is
physically isolated from the shielding in order to avoid physical disturbances to the low beta
system. The low beta quadrupoles focus the proton/anti-proton beams in the x- and y- plane,
prior to the collider experiment. The Q2 magnet is supported on the floor of the Tevatron and
spans the concrete interface between the Tevatron and the CDF Collision Hall. The low beta
system is critical to Collider operations as proton and anti-protons are delivered via this magnetic
conduit.
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Figure 3 Low beta magnets and girder suspended at A4 within the Collision Hall.
2. Problem-Solving Approach
Our approach to this vibrational issue began with evaluating the proton beam stability by
monitoring the beam losses at BO and other points around the Tevatron ring. Next, we
assembled the vibrational equipment that had the proper range and sensitivity with the ability to
be isolated from AC voltage sources. Then, we consulted vibration experts from others
Laboratories that had surmounted similar issues. Finally, several measurements were made after
waiting for sufficient access time, with the results guiding our trouble-shooting flow chart.
2.1. Vibrational Equipment
The ground, magnet and Invar rod measurement set-up involved the following equipment:- Sony Laptop
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McGee, Michael W. An Investigation of low beta triplet vibrational issues at Fermilab's Collider Detector, article, June 8, 2004; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc781486/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.