Abstracts Brochure - CERN

WEPCH057
WEPCH058
WEPCH059
28-Jun-06 16:00 - 18:00 WEPCH — Poster Session
also during the acceleration. Moreover it offers also information about the sum coupling coefficient and about the
location of the sources of coupling.
Measurement and Optimization of the Lattice Functions in the Debuncher Ring at Fermilab
V.P. Nagaslaev, K. Gollwitzer, V.A. Lebedev, A. Valishev (Fermilab)
V. Sajaev (ANL)
288
A goal of the Tevatron Run-II upgrade requires
substantial increase of antiproton production.
The central step towards this goal
is increasing the Debuncher ring admittance.
Detailed understanding of the Debuncher’s optics, aperture limitations and lattice functions is necessary. The method
of the response matrix optimization has been used to determine quadrupole errors and corrections to the design functions.
The measurement accuracy is about 5% due to the Beam Position Monitor system resolution and the small
number of steering elements in the machine. We have used these accurate measurements to redesign the machine
optics to maximize the acceptance of the Debuncher where the main limiting apertures are the stochastic cooling
pickups and kickers. Accuracy of the measurements and the limitations are discussed as well as details of the optics
modification.
Progress with Collision Optics of the Fermilab Tevatron Collider
A. Valishev, Y. Alexahin, G. Annala, V.A. Lebedev, V.P. Nagaslaev
(Fermilab) V. Sajaev (ANL)
Recent advances in the measurement and
modeling of the machine parameters and lattice
functions at the Tevatron allowed modifications
of the collision optics to be performed
in order to increase the collider luminosity. As the result, beta functions in the two collision points were decreased
from 35cm to 29cm which resulted in ∼10% increase of the peak luminosity. In this report we describe the results
of optics measurements and corrections. We also discuss planned improvements, including the new betatron tune
working point and correction of the beta function chromaticity.
Linear Lattice Modeling of the Recycler Ring at Fermilab
The Recycler Ring at Fermilab is a fixed 8
M. Xiao, V.P. Nagaslaev, A. Valishev (Fermilab) V. Sajaev (ANL) GeV kinetic energy storage ring, by the use
of permanent magnets in the ring lattice. It
is a strong focusing FODO lattice made up of either two gradient magnets or two quadrupoles(in dispersion free
straight sections). The magnetic properties of all magnets used were measured before installation and surveyed in
place to minimize possible errors. Nevertheless, substantial differences are found in tunes and beta functions between
the existing linear model and the real storage ring. It results in difficulties when tuning the machine to new lattice
conditions. We are trying to correct the errors by matching the model into the real machine using Orbit Response
Matrix(ORM) method. The challenge with ORM particular in this ring and the results are presented in this paper.