MICE analysis meeting - (21/09/2006)

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Transmittance, scraping and maximum radii for MICE STEPVI

M. Apollonio – University of Oxford

MICE analysis meeting - (21/09/2006)

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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)

MICE analysis meeting - (21/09/2006)

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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

MICE analysis meeting - (21/09/2006)

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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

MICE analysis meeting - (21/09/2006)

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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

MICE analysis meeting - (21/09/2006)

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beam maximum radius + cooling

MICE analysis meeting - (21/09/2006)

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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

MICE analysis meeting - (21/09/2006)

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=0.1cm rad

=0.3cm rad

downstream PZ=200 MeV/c, abs=42 cm

ratio

ratio

40K

heating

cooling

MICE analysis meeting - (21/09/2006)

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=1.0 cm rad

=0.6cm rad

PZ=200 MeV/c, abs=42 cm

MICE analysis meeting - (21/09/2006)

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=2.0 cm rad

=3.0 cm rad

PZ=200 MeV/c, abs=42 cm

MICE analysis meeting - (21/09/2006)

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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

MICE analysis meeting - (21/09/2006)

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=0.1cm rad

downstream

=0.3cm rad

PZ=240 MeV/c, abs=42 cm

40K

MICE analysis meeting - (21/09/2006)

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e=0.6cm rad

e=1.0cm rad

PZ=240 MeV/c, abs=42 cm

MICE analysis meeting - (21/09/2006)

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e=3.0cm rad

e=2.0cm rad

PZ=240 MeV/c, abs=42 cm

MICE analysis meeting - (21/09/2006)

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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

MICE analysis meeting - (21/09/2006)

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=0.1cm rad

downstream

=0.3cm rad

PZ=170 MeV/c, abs=15 cm

40K

MICE analysis meeting - (21/09/2006)

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=0.6cm rad

downstream

=1.0cm rad

PZ=170 MeV/c, abs=15 cm

MICE analysis meeting - (21/09/2006)

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=2.0 cm rad

downstream

=3.0 cm rad

PZ=170 MeV/c, abs=15 cm

MICE analysis meeting - (21/09/2006)

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transmittance

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PZ=200 MeV/c, abs=42 cm=0.1cm rad

=0.3cm rad

MICE analysis meeting - (21/09/2006)

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PZ=200 MeV/c, abs=42 cme=0.6cm rad

e=1.0cm rad

MICE analysis meeting - (21/09/2006)

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PZ=200 MeV/c, abs=42 cme=2.0cm rad

e=3.0cm rad

MICE analysis meeting - (21/09/2006)

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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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