EBIS Au beam at RHIC Page: 2 of 12
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EBIS Au Beam at RHIC
S.Y. Zhang
Abstract
With the EBIS beam and current setting in injector chain, the
Au beam at RHIC injection is different from the Tandem beam. The
transverse and longitudinal emittance of the EBIS Au beam at RHIC
is presented in this note. For further improvements of EBIS and in-
jector settings, this can be used to compare or to justify. Also, based
on Run 2012 conditions, the luminosity optimization in RHIC is of
interest to study.
1 Introduction
In 2012, the EBIS beam is used for U-U run and Cu-Au run. In Cu-Au
run (Runl2), 4 Booster loads are merged into 1 RHIC bunch with the Au
intensity of 1.6 x 109 ions. The intensity is close to previous Au-Au runs with
the Tandem as the ion source, e.g., Run 2011 (Runli), but the transverse
and longitudinal emittance at RHIC is not the same.
A rather strong dependence of the transverse emittance on bunch inten-
sity is observed in Cu-Au run. It is not straightforward to get the emittance
dependence on Au bunch intensity in a Cu-Au run, but some estimate can
be made.
In Runl2, the longitudinal emittance of Au beam at the RHIC injection
is about twice as large as that with the Tandem beam. The subsequent longi-
tudinal emittance growth during the ramp is weaker than Runli. Moreover,
the longitudinal emittance growth with high intensity is not stronger than
the low intensity ramp in Runl2. This is explained by the IBS simulation
with the larger initial transverse emittance for higher intensities. The fit-
ting of the initial transverse emittance is approximately agreeable with the
estimate of the transverse emittance dependence on intensity.1
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Zhang S. Y. EBIS Au beam at RHIC, report, September 4, 2012; United States. (https://digital.library.unt.edu/ark:/67531/metadc844757/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.