RF parameter curves for a proton driver synchrotron Page: 3 of 3
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Table 1: Proton Driver rf parameters
injection kinetic energy [MeV] 400
beam intensity [p/cycle] 3 - 1013
cycle repetition rate [Hz] 15
circumference/27r [m] 113.21
energy spread at injection [MeV] 0.5
momentum compaction -1.306 - 10-3
coefficient of (Ap/p)2 in path 8.252- 10-2
coefficient of (Ap/p)3 in path -0.4456
momentum acceptance [%] 2.5
vacuum chamber radius [cm] 6.35
mean beam radius at injection [cm] 4.44
Stage 1 parameters
extraction kinetic energy [GeV] 12
maximum rf voltage [MV] 1.2
accelerating voltage at 3max [MV] 1.09
harmonic number 126
number of populated buckets 119
bunch intensity 2.5- 1011
final rms emittance [eVs] 0.1
Stage 2 parameters
extraction kinetic energy [GeV] 16
maximum rf voltage [MV] 1.4
accelerating voltage at ]max [MV] 1.33
harmonic number 18
bunch intensity 1.7- 1012
final rms emittance [eVs] 0.4
rms bunch length at extraction [ns] < 3
Table 2: Comparison of RMS emittance at extraction and
fractional beam loss for optimum stage 1 parameters and
cases differing each in a single property
Parameter set emittance [eVs] loss [%]
optimum set 0.0197 0.03
rf in two sets 0.0181 0.07
all rf clumped 0.0154 0.21
no inductive insert 0.0247 3.19
0000 0010 0020 0030 0 040
Figure 2: RMS normalized emittance (solid), rms bunch
width (dashes), and rms bunch height (fine dots) for the
stage one acceleration cycle, all scaled to plot in the range
0 to 1.
o bJCKI zont 7 17E 01 ev source
'10 -5 " 5
Figure 3: Energy [MeV] vs. azimuth [deg] distribution of
.43 eVs bunch of 1.7- 1012 protons at 16 GeV after quarter
period rotation at 1.4 MV, Stage 2 Proton Driver.
8> - -3A8E-02
-1 -05 0 05
Figure 4: Azimuthal projection of roatated bunch shown in
Fig. 3, abcissa in degrees. The rms bunch length in time is
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James A. MacLachlan, Z. Qian and J.E. Griffin. RF parameter curves for a proton driver synchrotron, article, July 12, 2001; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc722372/m1/3/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.