Additional forward toroid calculations General Muon Meeting CERN June 17 2013 General layout of the full CMS yoke with the forward muon system 17 June 2013 2 Azimuthal magnetic flux density vs Z and ID: 799738
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Slide1
V. Klyukhin (SINP MSU / CERN
),
Additional forward toroid
calculations
General Muon Meeting@ CERN
June 17, 2013
Slide2General layout of the full CMS yoke with the forward muon system
17 June 2013
2
Slide3Azimuthal magnetic flux density vs. Z and
η
Z = 11.11 to 14.05 m
B
φ
=
1.77
to 2.14 T
3
Slide4Radial
magnetic flux density vs. Z and
η
Z = 6.333 to 10.755 m
B
r
~ 0.1 T
4
Slide5Axial
magnetic flux density vs. Z and
η
Toroids
Collar
B
z
~ 0.1 T
17 June 2013
Slava Klyukhin GMM@CERN
5
Slide6Total
magnetic flux density vs. Z and
on the beam axis
A steel
tube of 0.3 m outer radius and 0.184 m inner radius (the radial thickness is 0.116 m
)
is located from Z= 10.86 to 14.33 m
B < 0.025 T
Air gap
17 June 2013
Slava Klyukhin GMM@CERN
6
Slide7Bending component of
magnetic flux density vs. Z and
η
B
r
·cos
(
θ
)-
B
z
·sin
(
θ
) is 0.27
T at |
η| = 2.4 (2.519 m of steel) Br·cos(θ)-Bz·sin(θ) is
0.053
T at |η| = 2.75 (4.154 m of steel)
Br·cos
(θ)-
Bz·sin
(θ) is
0.051
T at |η| = 2.8 (3.921 m of
steel)
17 June 2013
Slava Klyukhin GMM@CERN
7
Slide8Azimuthal magnetic flux density vs. radius in toroids
B
φ
=
1.72
to
2.15
T
R = 0.4 to 2
.6 m
B
φ
=
0.023805·R
4
– 0.204631·R
3
+ 0.659016·R
2
+
1.037135(T/m)
·R(m) + 2.467933(T)
- in the 1
st
toroid - other two are similar
17 June 2013
Slava Klyukhin GMM@CERN
8
Slide9Azimuthal magnetic flux density vs. radius in GEM stations
17 June 2013
Slava Klyukhin GMM@CERN
9
Slide10Radial magnetic flux density vs. radius in toroids
Tube
17 June 2013
Slava Klyukhin GMM@CERN
10
Slide11Radial magnetic flux density vs. radius in GEM stations
Tube
Tube
17 June 2013
Slava Klyukhin GMM@CERN
11
Slide12Axial magnetic flux density vs. radius in toroids
Tube
17 June 2013
Slava Klyukhin GMM@CERN
12
Slide13Axial magnetic flux density vs. radius in GEM stations
Tube
17 June 2013
Slava Klyukhin GMM@CERN
13
Slide14Direction of the magnetic flux density w.r.t. Z-axis in toroids vs. R
Tube
17 June 2013
Slava Klyukhin GMM@CERN
14
Slide15Direction of the magnetic flux density w.r.t. Z-axis in
GEM stations vs. R
Tube
17 June 2013
Slava Klyukhin GMM@CERN
15
Slide16Conclusions
The presented forward muon system is robust
The proposed forward muon system is not expensive
The considered forward muon system covers the missing
|
η|
-region from
2.4
to
4The weight of the proposed system is compatible with the existing raiser abilityThe axial force onto three disks at the CMS positive Z-end is -
58.3
kN
(directed to the IP), the torques are
small
For comparison, the axial force onto HF absorber plus HF-shield plus HF-collar plus Rotating shielding is
-97.3
kN
(directed to the IP
).
The size of the presented forward muon system fits to the existing garages on both sides of the underground experimental cavern
A
ssembling the toroid magnets could be done in the underground cavern
17 June 2013
Slava Klyukhin GMM@CERN
16
Slide17BACKUP
17 June 2013
Slava Klyukhin GMM@CERN
17
Slide18View from
n
ear side at positive Z
17 June 2013
Slava Klyukhin GMM@CERN
18
Slide19The steel disk parameters
Outer diameter (m)
5.2
Inner
diameter (m)
0.8
Thickness (m)
0.78
Weight (t)
127Number of coils4Number of parts2 halvesNumber of disks at each end
3
Location: from
Z
=
±10.86 m
to
±14.3 m
(
0.2 m
GEM and
3
× (
0.05 m
coil,
0.78 m
disk,
0.05 m
coil,
0.2 m
GEM) –
3.44 m
in total
).
Covered
η
-
region
:
2.39
at
Z
=
14.05
m
,
R
=
2.6
m
;
4.02
at
Z
=
11.11
m
,
R
=
0.4 m
.
19
Slide20The coil parameters
Total length of conductor:
5100 m
,
total weight of
12
coils:
6 t
,
total voltage drop at 12 sequentially connected coils: 150 V, total power consumption by
24
coils:
270 kW
.
Conductor material
Copper OF
Conductor cross section (mm²)
18.5 × 18.5
Cooling hole diameter (mm)
10
Number of turns per coil
34
Conductor length per coil (m)
212
Operational current (A)
907.6
Current density (A/mm²)
3.44
Voltage drop per coil (V)
12.4
Power consumption per coil (kW)
11.25
Cooling water consumption (l/s)
12.9
for
Δ
T=5ºC
Number of coils at each end
12
20
Slide21Raisers could be used for the forward muon system
Slide22Garage to be used for the forward muon system