Development plan for the Nucleon Physics Laboratory Facility at LAMPF Page: 3 of 32
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present an overview of some of the new physics available in the nuclear
charge-exchange reactions. A report similar to this one was presented to the
August 1984 joint HRS/NPL Program Advisory Subcommittees with high priority
recommendation for the new ion source and the MRS. It also recommended a
buncher in 1986 on the existing source to benefit both the nucleon-nucleon (N-N)
and (p,n) nuclear physics programs. The Technical Advisory Panel was also pre-
sented with the proposal for the MRS and NTOF facilities in October 1984. Their
recommendation was that both of these facilities be implemented soon, NTOF in
1986 and MRS in 1987. Subsequent presentations have been made to the LAMPF
Board of Directors, DOE, and LAMPF Users Group. In December 1984, a two-day
workshop was held to discuss the two facilities. Approximately 50 attendees
representing 20 universities and national laboratories participated in that
workshop. This proposal represents the consensus of opinion of that workshop as
to the requirements needed to pursue the NTOF and MRS programs.
II. FACILITY UPGRADE
A. (p,n) Facility
One of the earliest possible additions to the NPL could be a beam swinger
and neutron time-of-flight (NTOF) facility for (p,n) reactions.
The primary H~ proton beam is deflected from its current direction in Area
B by approximately 30 degrees by a switching magnet (Fig. 1) into the swinger
area. Quadrupole magnets maintain focusing requirements on the (p,n) target as
the swinger angle is varied. Btamline instrumentation such as wire chambers,
ionization chambers, and polarimeter for determining beam profile, intensity,
and polarization will be used similar to existing devices on other P~ beamlines.
The beam swinger is a five magnet system used to vary the incident angle of
the proton beam on the (p,n) target, effectively changing the neutron scattering
angle while keeping the neutron flight path and detectors stationary. This
system is described in more detail in Appendix A. As currently envisioned, this
system will allow for momentum transfers greater than 3 fm-^ at all energies be-
tween 200 and 800 MeV. The fourth magnet of the swinger restores the proton
beam into a beam dump capable of stopping and shielding up to 600 nA of 800-MeV
protons. The existing Area B beam dump meets these requirements. The swinger,
(p,n) target, and beam dump reside in a shielded crypt appended to the Area B
room as shown in Fig. 1. Not shown in that figure is the neutron spin preces-
sion system used to precess longitudinal polarized neutrons into transverse so
as to be measurable in the neutron polarimeter, and also to periodically reverse
the outgoing neutron spin for cancellation of numerous systematic effects
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McClelland, J.B.; Bacher, A.; Boudrie, R.L.; Carey, T.A.; Donahue, J.; Goodman, C.D. et al. Development plan for the Nucleon Physics Laboratory Facility at LAMPF, report, February 1, 1986; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1099685/m1/3/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.