AHF MAGNETIC LENS CRYOSYSTEMS[Advanced Hydrotest Facility] Page: 2 of 8
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and lens system to illuminate a study object along 12 axes . The object-scattered protons
are then imaged by a system of large-bore magnetic lenses  for analysis.
Superconducting (SC) magnet cryosystem options have been developed for the AHF
system shown in FIG 1. The magnet cooling required divides the AHF system into two
areas: the lens SC magnets cooled by pool-boiling helium and the beam-transport lattice
SC magnets cooled by a flow of supercritical helium. Cryosystems for the later are
addressed in reference . This paper presents the development of the cryogenic systems
for the large-bore SC-lens option that is part of the project baseline. Provided are
recommendations for the helium-refrigerator/liquefier size, its site position, and the
distribution system. Additionally, estimates are provided for system costs.
THE LENS SYSTEM
The magnetic lens system contains 12 lens beam-lines arranged to illuminate the study
object. There are two types of lens lines: four large-bore and eight small-bore lens lines.
The lens beam-line types are constructed of the same functional elements, as shown in FIG
- -F ~
Small & Large
Small & Lar
4-e-- Small & Large
FIGURE 1. The lens system with monitor lenses. In a system without monitor lenses, the condenser and
eyepiece magnets would be moved closer to the object. The inserted box shows the lens-system position with
respect to the beam-transport lattice.
-40 -30 -20 -10 0 10 20 30 40 50
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KELLEY, J. P. & MULHOLLAND, G. T. AHF MAGNETIC LENS CRYOSYSTEMS[Advanced Hydrotest Facility], article, June 1, 2001; New Mexico. (digital.library.unt.edu/ark:/67531/metadc721057/m1/2/: accessed March 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.