Transcript Document

Collimator and beamline heating
External Review of the LHC Collimation Project
[email protected]
CERN Wed 30/6/2004
Description



FLUKA Simulation of a
100m section of the IR7
region (betatron cleaning)
Normal operation
0.2 hours beam life time
 4×1011 p/s for 10 s
Energy deposition from
cross talk of collimators
IR7 Layout
2
TCSH.016.B1
Beam 2
TCS.016.B1
MBW.B6L6
MBW.A6L6
MBW.D6L6
MBW.C6L6
IR7 Geometry
Beam 1
TCPS2
TCPV TCPS
TCPH
x
y
z
TCS.001.B1
TCSH.002.B1
TCSH.001.B1 TCS.002.B1
Top View
Cross Section
3
Collimator Geometry
Primary Collimators
10
Inox (5mm)
TCPV
Water (8mm)
5
x
Graphite (2.5cm)
Hybrid with Copper
0
Vacuum (5s,10s)
y
×z
Beam 2
Copper (4mm)
×
Beam 1
p/4
3p/4
-5
-10 Cross Section
-10
-5
0
5
10 cm
TCPH
TCPS
TCPS2
Length 20 cm
Secondary Collimators
2.424rad
0.672rad
0.008rad
TCS.001.B1
TCS.002.B1
Length 120 cm
TCS.016.B2
4
Other items
Beam Tube
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Dogleg Bends
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Modules: 4
 MBW.A6L7
 MBW.B6L7
 MBW.C6L7
TCSH.016.B1
TCS.016.B1
TCS.001
TCS.002
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MBW.B6L6
MBW.A6L6
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Beam 2
TCPS2
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Material: Copper
Inner radius: 4.2 cm
Outer radius: 4.4 cm
Inside MBW
 Rin: 2.2 cm
 Rout: 2.4 cm
TCPH TCPVTCPS
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MBW.D6L6
MBW.C6L6
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Beam 1
Top View
 MBW.D6L7
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Dimensions: 1.00 x 0.7 x 3.4 m3
Apperture: 52mm
Magnetic Field: 1.287 T
Kick angle: 0.38 mrad
5
Cases Studied
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Proton beam:
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Momentum 7 TeV/c
Impact parameter: 200 nm
Pencil-beam on Primaries 1cm before the end
(misaligned ~25 mrad)
Pencil-beam on Secondaries at the front face
(perfectly aligned)
1st phase system (no hybrid collimators)
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Results are weighted with the loss maps provided by
R.Assmann assuming multiple traversals of the beam.
3 cases: Impact at TCPV, TCPH, TCPS
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2nd phase system (with hybrid collimators)
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Results are given for 0.2 hours beam life time:
Loss rate = 4×1011 p/s for 10 s
6
Loss Maps
TCP 1
q= p/2
Div.x = 0 mrad
Div.y = 17 mrad
Aperture = 1.22 mm
TCP 2
q= 0
Div.x = -22.44 mrad
Div.y = 0
mrad
Aperture = 1.63 mm
TCP 3
q= 3p/2
Div.x = -15.79 mrad
Div.y = 12.39 mrad
Aperture =1.44 mm
Collimator # Absorbed
Total Abs.
597493
TCPV
462179
TCPH
94
TCPS
2079
TCPT
2573
TCS.001.B1
33867
TCS.002.B1
29276
Collimator # Absorbed
Total Abs.
582142
TCPV
106
TCPH
449885
TCPS
3980
TCPT
3641
TCS.001.B1
12518
TCS.002.B1
11719
Collimator # Absorbed
Total Abs.
460088
TCPV
193
TCPH
424
TCPS
307274
TCPT
51799
TCS.001.B1
11050
TCS.002.B1
23888
Fraction
77.35%
0.02%
0.35%
0.43%
5.67%
4.90%
0%
25%
50%
75% 100%
0%
25%
50%
75%
50%
75%
Fraction
0.02%
77.28%
0.68%
0.63%
2.15%
2.01%
Fraction
0.04%
0.09%
66.79%
11.26%
2.40%
5.19%
0%
25%
7
100%
TCSH.016.B1
W/cm3
TCS.016.B1
MBW.B6L6
MBW.A6L6
MBW.D6L6
MBW.C6L6
TCPV - Energy deposition
TCPS2
TCPV TCPS
TCPH
TCS.001.B1
TCSH.002.B1
TCSH.001.B1 TCS.002.B1
Average energy deposition per 4×1011p/s on tunnel and beam elements
for -1 < Y < 1m
8
* Not weighted with the loss map
Front Face
Dogleg Bending Magnets (MBW)
Beam 2
Beam 1
Max. Energy deposition for
MBW.B6L7
16 W/cm3/4×1011p/s
9
* Not weighted with the loss map
Phase #1: Case TCP1 (TCPV)
TCS.002.B1
W/cm3/4 1011p
TCS.001.B1
Graphite
Copper
Water
Inox
Inox
Graphite
Copper-T
Water
Inox
Graphite
Copper-T
Water
Inox
Maximum Energy deposition per 4×1011p/s (0.2 hours beam life time)
on secondary collimators
10
Phase #1: Case TCP2 (TCPH)
TCS.002.B1
W/cm3/4 1011p
TCS.001.B1
Graphite
Copper
Water
Inox
Inox
Graphite
Copper-T
Water
Inox
Graphite
Copper-T
Water
Inox
Maximum Energy deposition per 4×1011p/s (0.2 hours beam life time)
on secondary collimators
11
Phase #1: Case TCP3 (TCPS)
TCS.002.B1
W/cm3/4 1011p
TCS.001.B1
Graphite
Copper
Water
Inox
Inox
Graphite
Copper-T
Water
Inox
Graphite
Copper-T
Water
Inox
Maximum Energy deposition per 4×1011p/s (0.2 hours beam life time)
on secondary collimators
12
Phase #1: Beam tube
13
* Not weighted with the loss map
Phase #1: Power Deposition
TCP #1
Collimator
TCS.001.B1
TCS.002.B1
TCS.016.B2
Element
kW/4e11 p
TCP #2
Total
12
kW/4e11 p
Total
6.20
Copper-T
2.26
2.18
2.25
Water
0.42
0.41
0.48
Inox
2.68
2.66
2.73
17.06
Copper-T
5.00
5.03
5.36
Water
1.02
1.05
1.13
Inox
5.70
5.76
6.10
Graphite
0.00
Copper-T
0.00
0.00
0.08
Water
0.00
0.00
0.00
Inox
0.17
0.16
0.17
0.00
29
6.20
Graphite
0
17.50
11
kW/4e11 p
Graphite
29
6.13
TCP #3
0
18.43
0.08
Total
12
31
0
14
Phase #1: Power Distribution
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Total power intercepted
233 kW (52%) +Tunnel
Remaining 48% energy
escapes downstream
130 kW (30%) on beam
elements
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Iron:
Copper
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21 kW, 9.5 kW
6 kW, 1.5 kW
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TCPV: 10 W
TCPH: 290 W
TCPS: 700 W
TCPS2: 1.7 kW
Secondary Collimators
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Beam Tubes
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Primary Collimators
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MBW
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TCS.001.B1 12 kW
TCS.002.B1 27 kW
TCS.003.B1 245 W
Motors < 200 W
Beam1: 34 kW
Beam2: 2.4 kW
15
* TCP1 Loss scenario
Phase #2: With Hybrid
Graphite
TCSH.001.B1
Copper
W/cm3/4 1011p
TCS.001.B1
Copper
Water
Inox
Inox
Maximum Energy deposition per 4×1011p/s (0.2 hours beam life time)
on secondary collimators
16
* Not weighted with the loss map
Phase #2: With Hybrid (cont)
Graphite
TCSH.002.B1
Copper
W/cm3/4 1011p
TCS.002.B1
Copper
Water
Inox
Inox
Maximum Energy deposition per 4×1011p/s (0.2 hours beam life time)
on secondary collimators
17
* Not weighted with the loss map
Phase #2: Beam tube
18
* Not weighted with the loss map
Phase #2: Power Deposition
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Total power intercepted
363 kW (81%) +Tunnel
Remaining 19% energy
escapes downstream
247 kW (55%) on
beam elements
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Beam Tubes
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Beam1: 14 kW
Beam2: 1.8 kW
Collimator
TCS.001.B1
TCSH.001.B1
TCS.002.B1
TCSH.002.B1
TCS.016.B2
TCSH.016.B2
Element
Graphite
Copper-T
Water
Inox
Copper
Copper-T
Water
Inox
Graphite
Copper-T
Water
Inox
Copper
Copper-T
Water
Inox
Graphite
Copper-T
Water
Inox
Copper
Copper-T
Water
Inox
GeV/p
2.77
1.01
0.2
1.22
42.97
1.71
0.41
2.73
1.06
0.32
0.07
0.44
9.83
0.35
0.09
6.05E-001
8.23E-003
8.44E-003
2.20E-003
2.14E-002
1.66E-002
2.94E-003
1.13E-003
1.23E-002
%
0.54
1.41
1.69
0.77
0.69
0.50
0.79
0.52
1.98
2.00
1.29
1.42
2.64
1.90
2.31
2.03
8.45
9.38
4.92
6.76
16.13
5.80
6.93
4.03
kW/4e11 p
Total
7.50
14
2.70
0.50
3.30
116.60
130
4.70
1.10
7.40
2.90
5
0.90
0.20
1.20
26.70
30
1.00
0.20
1.60
0.00
0
0.00
0.00
0.10
0.00
0
0.00
0.00
0.00
19
* Not weighted with the loss map
Results
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Collimators intercept the largest fraction of the energy
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Phase #1 (no hybrid)
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For hadron-nucleon interaction at these energies one expect a
Pt=350 MeV/c
For hadron-nucleus interaction we have
Pt=400-500 MeV/c thus Pt/P=100 mrad (4 mm at 40m)
Structural elements (i.e. MBW, flanges...) around the beam tube
do not affect much the development of the shower
Results are weighted with the loss map
TCS.002.B1
~30 kW
No significant difference between the various cases
Energy deposition on beam pipe peaks ~30 W/cm
Phase #2 (with hybrid)
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TCSH.001.B1
130 kW!
Pending: Loss map weighting
20