Development plan for the Nucleon Physics Laboratory Facility at LAMPF Page: 4 of 32
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associated with polarimetry measurements away from 0 degrees. This precession
system is being developed by P and MP Divisions for use at Indiana University
Cyclotron Facility (IUCF) in 1986 and consists of a dipole magnet followed by a
superconducting solenoid. This configuration meets all spin direction require-
ments. Suitable collimation before and after the neutron spin precession system
produces a neutron beam matched to the detector size and distance from the (p,n)
A flight path of up to 600 meters is possible with some excavation as shown
in Fig. 2. Given the expected timing performance of both the accelerator and
detectors, this will yield neutron energy resolutions of 1 to 2 MeV at 800 MeV.
This is consistent with (p,n) work, being carried out at other laboratories at
lover energies. Beam timing characteristics will be monitored using inductively
coupled beam pickoffs as used at Weapons Neutron Research (WNR). These have
been tested in Line C during the 1985 production period. Fencing along the
flight path would restrict stray personnel from the neutron beam. Experience at
IUCF and WNR as well as dose calculations indicate that the neutron flux is low
enough to allow for experimentalists to be in the detector hut with the beam on.
Additionally, some shielding may be possible. Suitable instrumentation will
assure that the primary proton beam cannot reach the detector station. Addi-
tional access to the staging area and Area A counting houses will be provided.
Infrequent interruptions for large equipment access through the fenced flight
path ate acceptable. Note that the flight path passes over the current access
road to Area C by 15-20 feet, allowing for continual access during experiments.
The detector hut is probably a 3 x 10 meter portable house on a carriage
so that it can be positioned at three or four predetermined locations along the
600-meter flight path. It would be a self-contained unit housing the detectors
and their support systems, electronics, and computer acquisition area.
Alternatively, the acquisition station could be separate but move in tandem with
the detector station. It would require utility and patching stations at each of
the three or four acquisition stations.
The polarimeter for these studies is being developed by groups in P and MP
Divisions for use at IUCF. The polarimeter, sketched in Fig. 3, has three
planes (with the possible addition of an additional analyzer plane), each 1 m
long by 1 m high by 10 cm thick. Each plane consists of 10 individual cells 1 m
long by 10 cm high by 10 cm thick. The cells contain liquid scintillator,
providing an ideal active analyzer for polarimetry based on 1H(n,n)1H elastic
scattering. Time differences between the two ends of a cell give a position
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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/m1/4/: accessed May 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.