# Transverse collimation: assumptions

Urban and Civil

Nov 15, 2013 (4 years and 7 months ago)

70 views

1
Transverse collimation:assumptions
Chicane takes up ﬁrst 30 m of the decay channel.
The rest of the decay channel can be used for transverse
collimation.
I used Study 2A coil layout in the decay channel.
Assume we only have muons with p < 500 MeV/c.
2
Transverse collimation:issues
Don’t have the particle distribution,assume the distribution
30 m down the decay channel (used 33.7 m,had data
Transmission from the decay channel to the end of the
cooling section is 50%(depending on where along the
decay channel we start).
The beam is scrambled,there is no dispersion;hence,no
means to localize the particles that are lost (next two
slides).
3
Start at 33.7 m down the decay channel:
-400
-200
0
200
400
-400
-300
-200
-100
0
100
200
300
400
x [mm]
y [mm]
33.7 m down the decay channel

Survived
Lost
-400
-200
0
200
400
-400
-300
-200
-100
0
100
200
300
400
x [mm]
y [mm]
33.7 m down the decay channel

Lost
Survived
All particles:

x
=105 mm,

p
x
=27 MeV/c;
Survivors:

x
=94 mm,

p
x
=26 MeV/c;
Lost particles:

x
=115 mm,

p
x
=28 MeV/c.
4
Start at 59.95 m down the decay channel:
-400
-200
0
200
400
-400
-300
-200
-100
0
100
200
300
400
x [mm]
y [mm]
59.95 m down the decay channel

Survived
Lost
-400
-200
0
200
400
-400
-300
-200
-100
0
100
200
300
400
x [mm]
y [mm]
59.95 m down the decay channel

Lost
Survived
5
Transverse collimation:questions
Need dispersion to isolate unwanted muons (quad
channel?)
If we assume Study 2A layout with SC coils,there is
practically no room for collimators + shielding;temperature
issue.
Beam contamination after the chicane (what else do we
have besides the muons)?