Particle production for a muon storage ring: I. Targetry and pi/mu yield Page: 2 of 6
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2 Captured r/p beam vs target and beam parameters
Realistic 3-D geometry together with material and magnetic field distributions
based on the solenoid magnet design optimization have been implemented
into MARS. Graphite (C) and mercury (Hg) tilted targets were studied. A two
interaction length target (80 cm for C of radius RT=7.5 mm and 30 cm for
Hg of RT=5 mm) is found to be optimal in most cases, keeping RT >2.5 o-,,,
where -,,y are the beam RMS spot sizes. The calculation model (Fig. 1),
keeping the main features of the baseline design [8,9], has been significantly
refined in the course of the study . A deviation of B2 and Br (Fig. 1 (right))
from the ideal field [8,9], results in the reduction of the r/p-yield in the decay
channel by about 7% for C and by 10-14% for Hg targets.
o 4 4 7 1 1
R=7.5cm R =30cm
-1 0 1 2 3 4
Fig. 1. MARS model of the target/solenoid system (left) and Bz field profile (right).
4oG s------ --- -G4
0 --- - - -- - - --
oz - -- -- --' -- --
0o 20 00 60 0 1000 0o 0 0s40 60 0 1000
x 10 x1o-2
04 ---1 - - - ~
o 1e'c'r'2 rg, e 2 e04 r cr9 Me.100
F 2. Energ24 G V
Fig. 2. Energy spectra of 7+
0.1 0.2 0.3 0.4
0.5 0.6 0.7
for 4 to 24 GeV protons (left) and numbers
of particles in the (Emin-0.8 GeV) interval vs Emin for 16 GeV protons (right) at
z=9 m for a 80-cm C target (RT=7.5 mm, a=50 mrad).
16 GeV on carbon
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Mokhov, Nikolai V. Particle production for a muon storage ring: I. Targetry and pi/mu yield, article, September 14, 2000; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc720301/m1/2/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.