Performance and measurements of the Fermilab Booster Page: 4 of 9
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FIGURE 1. Proton intensity at collisions: The zero intensity points divide stores before and
after the Linac upgrade.
OVERVIEW
The Fermilab Booster [5] is a rapid-cycling, 15 Hz, alternating-gradient syn-
chrotron with average orbit radius of 75.47 meters. It accelerates protons from
400 MeV, the kinetic energy of the Linac beam, to 8 GeV, the nominal injection
kinetic energy of the Main Ring/Main Injector. The lattice consists of 96 combined-
function magnets in 24 periods. The nominal horizontal and vertical tunes are 6.7
and 6.8. The revolution time at injection is 2.2 ps. The linac delivers peak-current
of 45 mA and the transfer line to the Booster usually runs with 98% transmission
efficiency. Usually up to ten turns of H- beam is injected. During injection a
pulsed orbit bump magnet system is used to superimpose the trajectories of circu-
lating and injected beam. The beam is accelerated with 17 rf cavities, transition
gamma of the ring is 'y = 5.445 and harmonic number of the ring is h = 84.
MEASUREMENTS
Many effects determine the behavior of the beam in the Booster at injection:
the linac beam energy, the energy spread, the beam transverse emittances, and
injection mismatch. In addition, the Booster has no "porch" at injection, the main
magnetic field oscillates sinusoidally at 15 Hz and DC beam must be "adiabatically"
captured in rf buckets fairly quickly. All these effects are mixed with effects coming
from nonlinear field errors and significant remanent sextupole field at injection. In
order to determine the relative contribution of all of these effects on the beam loss
we have measured and vary most of these parameters one at a time around their
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Popovic, M. & Akenbrandt, C. Performance and measurements of the Fermilab Booster, article, June 1, 1998; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc619171/m1/4/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.