Bevalac: a high-energy heavy-ion facility. Status and outlook Page: 4 of 5
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
Page 4
The largest impact would be made by improving the vacuum of the synchrotron.
A careful engineering study has been made at LBL with the conclusion that a
vacuum of 10-9 Torr is quite practical (Fig. 4). At the SuperHILAC output of
3.5 MeV/n the equilibrium charge for lead from a foilstripper would be about 72,
and hence a - 1/3. This results in a maximum energy of 1.5 GeV/n. A substantial
fringe benefit from an excellent vacuum in the synchrotron is the fact that
lighter ions can also be accelerated with an E < 112; in fact, the a (min) will
be given by the acceptance of the post-stripper tank which is c = .167. This
will allow the synchrotron, by judicious choice of the injection energy, to de-
liver heavy ions in the energy region of 20-200 MeV/n. The intensity will be
about 1011 particles per pulse up to argon.
With some obvious improvements to the injectors of the SuperHILAC, an intensity
of close to 108 lead particles per pulse is quite feasible. A further increase in
intensity would be accomplished by providing the third injector which is currently
under discussion. This would result in up to a factor of 100 in improved inten-
sities, It would have the additional very important advantage of rapid change-
over from one ion source to another. The most critical component in a high-intensity,
high mass particle injector is the ion _ource. The 2.5 MV injector does not
have the space nor the power for a high-power high-lifetime ion source.
As an experimentalist, 1 cannot resist telling you a little bit about our opera-
tions experience with the transfer line (see Fig. 1). We did a lot of worrying
over this line through a wooded hillside with odd angles to anything you may
care to take as reference, which finally hal to match into the existing line
from the 50 MeV proton linac. Given the SulerHILAC output in terms of energy
spread and emittance of '0.5% FWHM and mcm mad respectively, it became clear
that all bends had to be achromatic. Furthermore, we added some small but stra-
tegically distributed steering magnets. We found that in fact the fears were un-
founded and the transfer line worked quite well from the beginning.
Let me finish this short discussion with a project which could materially influ-
ence the heavy-ion capability at LBL.
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Grunder, H.A. Bevalac: a high-energy heavy-ion facility. Status and outlook, report, March 1, 1975; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc881202/m1/4/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.