The SpinQuest (E1039) experiment’s polarized target system
M. Farooq*, W. Ahmed and D. Keller
Published on:
July 30, 2024
Abstract
The SpinQuest experiment at Fermilab aims to measure the Sivers asymmetry for the light sea quarks in the longitudinal momentum fraction range of 0.1 < $x_B$ < 0.5 from the Drell-Yan process. A nonzero Sivers asymmetry measurement would be indicative of a nonzero orbital angular momentum contribution from the sea quarks. The SpinQuest experiment uses the proton beam from Fermilab’s 120 GeV main injector, which will provide about $10^{11}$ protons per second during a 4.4-second spill. The SpinQuest polarized target uses a superconducting split-pair magnet with an operating magnetic field of 5T with transversely polarized NH${_3}$ or ND$_3$ targets (8cm long target cells). The maximum intensity that the target can handle will be determined during beam-target commissioning. As proposed SpinQuest will be the highest integrated proton beam luminosity, around 2 $\times$ 10$^{42}cm^{-2}$, ever on a solid polarized target. The helium-4 evaporation refrigerator operates at 1 Kelvin using high-powered evaporation from a roots stack with a pumping rate of nearly 17,000 $m^3$/hr. The anticipated average target polarization of 80\% for protons and 32\% for deuterons will be measured using three NMR coils equally spaced apart in the target cell.
DOI: https://doi.org/10.22323/1.456.0209
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