mice analysis meeting - (21/09/2006) 1 transmittance, scraping and maximum radii for mice stepvi m....
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MICE analysis meeting - (21/09/2006)
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Transmittance, scraping and maximum radii for MICE STEPVI
M. Apollonio – University of Oxford
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parameters used in simulation (ICOOL) TRANSMITTANCE
Define a VACUUM channel (NO ABS, NO RF) and a large aperture upstream/downstream channels
40cm + vacuum channel + 40cm + 90cm Evaluate amplitude upstream/downstream and do the
ratio=transmission/amplitude Max radius (effect of scraping) and cooling
Use the realistic channel (real radii) Select throughoing muons Record the max radius for every z-slice
Parameters used in ICOOL simulation Pz=240, 200, (170) MeV/c with no gaussian spread initial emittances: 0.1, 0.3, 0.6, 1.0, 2.0, 3.0 (cm rad) 40000 generated muons per initial emittance 128 positions along Z to study the amplitudes of the beam (Single
Particle Emittance)
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NuNdT=Nd/Nu
Scheme for transmission study:No selection on muonsRatio between downstream and upstream particles
Scheme for max radius and cooling study:selection on muons only throughgoing acceptedSearch for max value of radial distribution
R=40 cm R=40 cm
R=90 cm
Zu=-5.2 m Zd=-5.2 m
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CAVEAT:
The RF is designed to work with a beam of ~200 MeV/c
When working with 240/170 MeV/c the RF config should be changed properly
I did it “by hand” changing the phase and the peak voltage
Discovered yesterday
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N.B. RF @ 200 MeV/c: 8.74 MV/m – 90 deg P
(G
eV/c
)
Z (m)
Still not perfect …
9.1 MV/m – ph.shift=30 deg
Pz=170 MeV/cemi=1 mm rad
Z (m)
P (
GeV
/c)
8.74 MV/m – ph.shift=130 deg
Pz=240 MeV/cemi=1 mm rad8.74 MV/m
ph.shift=90
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beam maximum radius + cooling
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0.1 cm rad0.3 cm rad0.6 cm rad1.0 cm rad2.0 cm rad3.0 cm rad
PZ=200 MeV/c, abs=42 cm
MICE profilein ICOOL sim
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=0.1cm rad
=0.3cm rad
downstream PZ=200 MeV/c, abs=42 cm
ratio
ratio
40K
heating
cooling
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=1.0 cm rad
=0.6cm rad
PZ=200 MeV/c, abs=42 cm
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=2.0 cm rad
=3.0 cm rad
PZ=200 MeV/c, abs=42 cm
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0.1 cm rad0.3 cm rad0.6 cm rad1.0 cm rad2.0 cm rad3.0 cm rad
PZ=240 MeV/c, abs=42 cm
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=0.1cm rad
downstream
=0.3cm rad
PZ=240 MeV/c, abs=42 cm
40K
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e=0.6cm rad
e=1.0cm rad
PZ=240 MeV/c, abs=42 cm
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e=3.0cm rad
e=2.0cm rad
PZ=240 MeV/c, abs=42 cm
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0.1 cm rad0.3 cm rad0.6 cm rad1.0 cm rad2.0 cm rad3.0 cm rad
PZ=170 MeV/c, abs=15 cm
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=0.1cm rad
downstream
=0.3cm rad
PZ=170 MeV/c, abs=15 cm
40K
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=0.6cm rad
downstream
=1.0cm rad
PZ=170 MeV/c, abs=15 cm
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=2.0 cm rad
downstream
=3.0 cm rad
PZ=170 MeV/c, abs=15 cm
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transmittance
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PZ=200 MeV/c, abs=42 cm=0.1cm rad
=0.3cm rad
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PZ=200 MeV/c, abs=42 cme=0.6cm rad
e=1.0cm rad
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PZ=200 MeV/c, abs=42 cme=2.0cm rad
e=3.0cm rad
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PZ=170 MeV/c, abs=15 cm
!!!! 4K !!!!
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PZ=170 MeV/c, abs=15 cm
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PZ=170 MeV/c, abs=15 cm
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PZ=240 MeV/c, abs=42 cm
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PZ=240 MeV/c, abs=42 cm
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PZ=240 MeV/c, abs=42 cm
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