Beam Transport of 4 GeV Protons from AGS to the Proton Interrogation Target of the Neutrino line (Z_line) and Effect of the Air on the Transported Beam

Abstract

As part of the preparation for the Proton Interrogation Experiment, we have calculated the beam optics for the transport of 4 GeV protons, from the AGS extraction point, to the “Cross-Section Target Wheel 1” and to the “Proton Interrogation Target”. In this technical note we present three possible beam-transports each corresponding to a particular Fast Extracted Beam (FEB) setup of the AGS. In addition we present results on the effect of the atmospheric air, (which fills the drift space of the last 100 [m] of the transport line), on the size of the beam, at two locations along the drift space, one location at the middle of the drift space and the other at the end where the “Proton Interrogation Target” is placed. All the beam transports mentioned above require the removal of the WD1 dipole magnet, which is the first magnet of the W_line, because it acts as a limiting beam aperture, and the magnet is not used in the beam transport. An alternative solution of a beam transport, which does not require the removal of the WD1 magnet, is also presented. In this solution, which models the transport line using the TURTLE computer code, the vertical beam sizes at the location of the WD1 magnet is minimized to allow “lossless” beam transport at the location of the WD1 magnet. A similar solution, but using a MAD model of the line, is also presented.

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