Physics and medicine: the Bevatron/Bevalac experience, 1979-1980 Page: 4 of 4
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conditions for each discipline, important programs of
research can be and have been carried out
effectively3.
Therapy progress is substantial. Approximately
50 patients have been treated with heavy ions, many
of them to far better effect than other modalities
have accomplished. The program will continue through
the operational portion of FY81 and is expected to
resume in 1982, after the Bevatron remodeling for
uranium capability is complete.
Nuclear science research is continuing at a
substantial rate, limited for the most part by severe
funding restrictions common to all DOE national
laboratories, exacerbated in our case by the
versatility inherent in this one accelerator in terms
of ion type, energy and intensity. Experiments are
designed to capitalize on this versatility, thus
limiting severely the possibilities of beam-sharing
so easily accomplished at single-ion and/or
single-energy facilities.
Experimental multiplicity, the number of research
hours per operating hour, is low now but is expected
to increase substantially when "mezzanine" operation
begins in 1981. Two-energy operation on a single
Bevatron/Bevalac pulse will be available, as will a
"transparent" therapy mode. In that mode all of the
beam is delivered to a nuclear science experiment at
its optimum energy except for about two minutes of
every half hour, when the beam is delivered at the
other energy level to the therapy area.
DISCLAMER
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Figure 1 - A portion of the SuperHILAC -
Bevatron/flevalac master schedule. tile the
S'aperHiILMC progrin Is operating with heavy ions
(xenon and lead) the Bevatron/Bevalac program is
operating with protons from the local injector, and
neon and argon from the SuperHILAC.
3Rapidly gained expertise in multi-programed,
multi-tasked computer control systems and in their
application to the Bevatron/Bevalac, extensive use )f
septum split of accelerated beam, :;nd imminent use of
the mezzanine mode make this complex outstanding for
heavy ion research in nuclear science, radiotherapy,
and radiobiology. Experience gained now by the
operations staff will be directly and immediately
applicable to the design and operation of the next
generation of relativistic heavy ion accelerators.
Despite the complexities of scheduling for both
disciplines, the Bevatron/Bevalac has operated
extremely well in its new role of purveyor of
particles to therapy, hiomed and nuclear science,
with an overall availability of 85-90% and with
actual operation for nuclear science at 75-80% of
scheduled, and for biomed and therapy some 80-85% of
scheduled.
References
1. J. Castro et al, "Heavy Ion Therapy", Biological
and Medical Research with Accelerated HaIeJTons
at the Bevalec 1974-1977 (1977a. Lewrerce
Berkeley Laboratory report LHL 5610.
2. J. Castro et al, "Clinical Resuits in Heavy
Particle Radio Therapy", Biological and Medical
Research with Accelerated-fea ions at the
Bevalac 1977-1980 (1980). Lawrence Berkeley
Laboratory Report LBL 11220.
3. J. Alonso, T. Criswell, J. Howard, R. Singh,
D. Geller "Operations Experience at the Bevalac
Radiotherapy Facility" (1981). LBL 11725, these
proceedings.
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Figure 2 - Sevatron/Bevalac Experimental Area.
Same - pulse beam sharing is possible between one
beam line to the left of, and one to the right of
the imaginaryy) sharing axis.
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Lothrop, F.; Alonso, J.; Force, R.; Grunder, H.; Lewis, S.; Miller, R. et al. Physics and medicine: the Bevatron/Bevalac experience, 1979-1980, article, January 1, 1981; California. (https://digital.library.unt.edu/ark:/67531/metadc1206802/m1/4/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.