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The design and performance of the FNAL high-energy polarized-beam facility
Journal article   Peer reviewed

The design and performance of the FNAL high-energy polarized-beam facility

D.P Grosnick, Y Onel, J.B Roberts, J.L White, A Penzo, D.A Hill, D.H Miller, M.R Laghai, D Lopiano, Y Ohashi, …
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, Vol.290(2), pp.269-292
1990
DOI: 10.1016/0168-9002(90)90541-D

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Abstract

A new polarized-proton and -antiproton beam with 185 GeV/ c momentum has been built at Fermilab. The design uses the parity-nonconserving decays of lambda and antilambda hyperons to produce polarized protons and antiprotons, respectively, a beam-transport system that minimizes depolarization effects, and a set of twelve dipole magnets that rotate the beam-particle spin direction. A beam-tagging system determines the momentum and polarization of individual beam particles. This allows a selection of particles in definite intervals of momentum and polarization. Measurements performed by two different polarimeters showed that the beam is polarized and the determination of polarization by beam-particle tagging is verified. A new measurement of the analyzing power of large- x F π 0 production may lead to another beam polarimeter.

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