The status of Run II at Fermilab Page: 1 of 3
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t Fermilab
FERMILAB-Conf-02/233-E October 2002
1
The Status of Run II at Fermilab
K. Gounder, a *
aBeams Division, Fermi National Accelerator Laboratory,
P.O. Box 500, Batavia, IL 60510. U.S.A.
The Run II at Fermilab is progressing steadily. In the Run IIa scheme, 36 antiproton bunches collide with
36 proton bunches at CDF and DO interaction regions in the Tevatron at 980 GeV beam energy. The current
status and performance of the Fermilab Accelerator Complex is reviewed. The plans for Run IIb along with the
Antiproton Source upgrade and incorporation of the Recycler Ring in the accelerator chain are outlined. The
prospects of achieving Run II integrated luminosity goal of 15 fb-1 are discussed.1. INTRODUCTION
The Accelerator Complex at Fermilab has de-
livered an integrated luminosity of 80 pb- as part
of collider Run IIa through August 2002. The
performance has been improving steadily in the
midst of many upgrades to the accelerator com-
plex. The major components of the complex
are: (1) The proton source consists of Linac and
Booster; (2) The Antiproton Source containing
the Debuncher and Accumulator; (3) The Teva-
tron as the collider storage ring for protons and
antiprotons; (4) The Main Injector for acceler-
ating and transfering beams between the beam
sources and the Tevatron; (5) The Recycler Ring
to be incorporated shortly in the accelerator com-
plex as an antiproton storage facility. After a
brief over view of the present collider operations
in the next section, the present status of Run II
is discussed in section 3. Details of the Recycler
Ring commissioning and upgrades for improving
the luminosity in Run IIb are outlined in sections
4 and 5.
2. OVERVIEW OF OPERATIONS
There are two important operational modes for
the Fermilab accelerator complex during the col-
lider runs [1], [2]: (1) Stacking - collecting an-
tiprotons in the Accumulator; (2) Tevatron Shots
*Fermilab is operated by Universities Research Associa-
tion, Inc. under contract with the U.S. Department of
Energy- loading the Tevatron with protons and antipro-
tons for colliding stores.
During the stacking mode, the proton beam
is delivered from the Booster to antiproton tar-
get via the Main Injector (MI) every 2.4 seconds.
About 84 8 GeV 53MHz bunches of protons from
the Booster are accelerated to 120 GeV in the
Main Injector before delivery to the Antiproton
target. The resulting 8 GeV antiprotons from
the production target are collected, debunched
and stochastically cooled in the Debuncher. Then
the beam is transferred to the Accumulator where
they are stacked and cooled into a 'core'.
The Tevatron shots start with 7 53 MHz
bunches of proton beam in the Booster. They
are brought to the Main Injector, accelerated to
150 GeV and coalesced into one bunch and in-
jected into the Tevatron. This is repeated until 36
bunches separated by 396 nanoseconds are loaded
into the Tevatron central orbit. In the next step,
antiproton beam made up of sets of 7 bunches
with 53 MHz structure from the Accumulator are
transferred to the Main Injector and accelerated
to 150 GeV. This beam is coalesced into four
bunches and injected into the Tevatron. This is
continued nine times till 36 bunches of antipro-
tons are circulating in the Tevatron in separated
helical orbits with the proton bunches. Then the
whole beam is accelerated to 980 GeV and are
brought into collision at the interaction regions
at BO and DO after a low beta squeeze. A col-
lider store normally lasts for about 1 luminosity
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Gounder, Krish. The status of Run II at Fermilab, article, October 7, 2002; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc737874/m1/1/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.