The basic premises of the conceptual design for the linac upgradc 1 are pursued to establish lengths, gradients, power dissipation, etc. for the 400 Me V linac and matching section. The discussion is limited to accelerating and focusing components. Whexcvcr values depend on the choice of the accelerating structure, the disk-and-washer structure is emphasizedj the results are generally relevcnt to the side coupled cavity choice also. 1 TewatJ"on Upg7'atle-Linae Conceptual Deaign, Fermilab 1 April 1987 2!nitall.y 1 Al Moretti, principally Leroy L&l'l'y for the DAW structure, and more recently Tom Jurgens for the SCC 11tructure. 3 e.g., E. A. Knapp et al., Rev. Sci. Inst.,SO no. 7(7/68) 4 R. K. Cooper et aL, Radio-Frequency Structure Devdopment for the Los Alamos/NBS Racetrack. Microtron, LA-UR-83-95 1 Loa Alam.011 Natl. Lab(l/83) and references cited therein
The production parameters for the Fermilab antiproton source are p=S.4 GeV/c, E=Snxl0-6 m, 6p/p=±2%. The optimum conditions of p production may be provided only by using a short focus optical device with high magnetic field as is shown in /1/. i These pulsed devices with B>lOO kG are lithium lenses, parabolic lenses and special high gradient pulsed quadrupoles. -The dependence of p collection efficiency on the angular ' acceptance for different focusing devices in comparison with an ideal lens is shown in Fig. 1. This dependence is taken from /2/ and has been obtained as result of the computer simulation of the capture efficiency into acceptance E=S•10-6 m, 6p/p=±2% taking into account chromatic aberrations, nuclear absorption, and multiple scattering in lithium and beryllium lenses.
The Fermilab Main Injector, which is under construction, will be a high intensity proton synchrotron and will be capable of accelerating (decelerating) protons and antiprotons from 8.9 GeV/c to 150 GeV/c (150 GeV/c to 8.9 GeV/c). Presently, the plan is to accelerate or decelerate the beam through the transition energy of 20.49 GeV, using basic normal phase jump scheme. Efficient deceleration ofp through the Main Injector is crucial for the success of the Recycler Ring Project. We have performed extensive longitudinal beam dynamics simulations for both modes of operation to determine the beam intensity limits and other properties. We present the latest results of calculation and their implications.
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