secondary particles energy/power deposition in the lhc insertion : status
DESCRIPTION
Secondary Particles Energy/Power Deposition in the LHC Insertion : status. Tracking FLUKA Energy Deposition. After the Monday morning meeting and discussions with J.P. Koutchouk, W. Scandale, A. Siemko, E. Wildner, C. Hoa, E. Todesco. [email protected] [email protected]. - PowerPoint PPT PresentationTRANSCRIPT
NED Steering Commitee meeting CERN - 23 February 2006
Secondary Particles Energy/Power Deposition
in the LHC Insertion : status
TrackingFLUKA Energy Deposition
After the Monday morning meeting and discussions with J.P. Koutchouk, W. Scandale, A. Siemko, E. Wildner, C. Hoa, E. Todesco
NED Steering Commitee meeting CERN - 23 February 2006
Comment about the work done so far
• Standard layout LHC Vers 6.5 has higher values of power deposed in the quads, respect to the “academic” reference case studied before
• Need of taking into account all the engineering details (BEAM SCREEN)
NED Steering Commitee meeting CERN - 23 February 2006
Beam Screen as in IP5 (Horizontal crossing angle)
(top/bottom cooling pipes)
NED Steering Commitee meeting CERN - 23 February 2006
Parameters
“old” ref. Case 70-235-80
LHC V6.5 70-203.7-00
DISTANCE from I.P. (m)
Beam pipe radius (mm)
LENGTH (m)
DESCRIPTION LENGTH (m)
Beam pipe radius (mm)
DISTANCE from I.P. (m)
19.0 31.5 19.0 Detector + free space 19.05 23.0 / 28.5 19.05 20.8 15.0 1.8 Collimator 1.8 15.0 20.85 23.0 31.5 2.2 Free space collimator - Q1 2.115 23.0 / 28.5 22.965 28.5 31.5 5.5 Q1 quad 6.37 23.0 / 28.5 29.335 28.8 31.5 0.3 Free space Q1 - Q01 30.3 31.5 1.5 Q01 inner triplet trim quad. 31.0 31.5 0.7 Free space Q01 - Q2a
2.715
30.0 / 33.35
32.05 36.5 31.5 5.5 Q2a quad 5.5 30.0 / 33.35 37.55 36.9 31.5 0.4 Free space Q2a – ITC 37.1 31.5 0.2 ITC 37.5 31.5 0.4 Free space ITC - Q2b
1.0
30.0 / 33.35
38.55
43.0 31.5 5.5 Q2b quad 5.5 30.0 / 33.35 44.05 43.4 31.5 0.4 Free space Q2b – ITC 0.692+1.2+
0.5175 30.0 / 33.35 46.4595
43.6 31.5 0.2 Inner triplet corrector 0.223 30.0 / 33.35 46.6825
45.3 31..5 1.7 Free space ITC - Q3 0.2825 30.0 / 33.35 46.965
50.8 31.5 5.5 Q3 quad 6.37 30.0 / 33.35 53.335 200 rad Crossing angle 300 rad
•No Q01 trim quad
•Different beam pipe aperture
•Beam pipe horizontal aperture when beam screens are considered
•Check the biasing and cut-off in the new defined regions (Beam Screen)
•The beam screen is present all along the beam pipe not only under the quads !!!!
Approximate results (trend)
NED Steering Commitee meeting CERN - 23 February 2006
Tracking results
(assuming L = 1034 cm-2 s-1 = 80 mbarn)
NED Steering Commitee meeting CERN - 23 February 2006
Total Power in the Quadrupoles
OLD ref. Case LHC Optics V 6.5 LHC V6.5
no BS with BS
19.7 Power in the beam pipe before the collimator (W) 25.6 21.3
134.9 Power in the collimator (W) 105.4 128.6
17.1 Power in the beam pipe after the collimator (W) 21.6 17.3
Pbeam ~ 900 W
~ 1/3 deposed in the insertion
~ 2/3 escaping
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
1 2 3 4 5 6 7 8 9 10 11 12
TOTAL POWER IN QUAD Q1 TOTAL POWER IN Q2a TOTAL POWER IN Q2b TOTAL POWER IN Q3
"Old" Reference case (+11 W in Q01)
LHC Optics V 6.5no beam screens
LHC Optics V 6.5 with beam screens
NED Steering Commitee meeting CERN - 23 February 2006
Power in the poles of the first shell
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
1 2 3 4 5 6 7 8 9 10 11 12
Power in the first shell of Q1
"Old" Reference case (+11 W in Q01)
LHC Optics V 6.5no beam screens
LHC Optics V 6.5 with beam screens
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
1 2 3 4 5 6 7 8 9 10 11 12
Power in the first shell of Q2a
"Old" Reference case (+11 W in Q01)
LHC Optics V 6.5 with beam screens
LHC Optics V 6.5no beam screens
0.0
0.5
1.0
1.5
2.0
2.5
1 2 3 4 5 6 7 8 9 10 11 12
Power in the first shell of Q2b
"Old" Reference case (+11 W in Q01)
LHC Optics V 6.5no beam screens
LHC Optics V 6.5 with beam screens
0.0
0.5
1.0
1.5
2.0
2.5
1 2 3 4 5 6 7 8 9 10 11 12
Power in the first shell of Q3
"Old" Reference case (+11 W in Q01)
LHC Optics V 6.5no beam screens
LHC Optics V 6.5 with beam screens
NED Steering Commitee meeting CERN - 23 February 2006
Thermal scaling
18 20 22 24 26
2.0
2.2
2.4
2.6
2.8
Max. Temperature in the coil (K) (SS Collar) Max. Temperature in the coil (K) (Al Collar) Max. Temperature in the layer (K) (SS Collar) Max. Temperature in the layer (K) (Al Collar)
Tem
pera
ture
[K]
Power in the Quad [W]1.7 1.8 1.9 2.0 2.1 2.2 2.3
2.0
2.2
2.4
2.6
2.8
Max. Temperature in the coil (K) (SS Collar) Max. Temperature in the coil (K) (Al Collar) Max. Temperature in the layer (K) (SS Collar) Max. Temperature in the layer (K) (Al Collar)
Tem
pera
ture
[K]
Power in the quad first layer [W]
case Power in the quadrupole (W) Power in the first shell (W)70-235-82 22.4 1.970-235-82+unif ads. 27.5 2.2570-300-105 25.3 2.385-235-82 19.4 1.75
NED Steering Commitee meeting CERN - 23 February 2006
Thermal scaling
18 20 22 24 26 28 30 32 34 36 38 40
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
?
Max. Temperature in the coil (K) (SS Collar) Max. Temperature in the coil (K) (Al Collar) Max. Temperature in the layer (K) (SS Collar) Max. Temperature in the layer (K) (Al Collar)
Tem
pera
ture
[K]
Power in the Quad [W]2.0 2.5 3.0 3.5 4.0
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
??
Max. Temperature in the coil (K) (SS Collar) Max. Temperature in the coil (K) (Al Collar) Max. Temperature in the layer (K) (SS Collar) Max. Temperature in the layer (K) (Al Collar)
Tem
pera
ture
[K]
Power in the quad first layer [W]
Thermal analysis will confirm (!!) or not the linear scaling
If linear scaling is valid a careful check of the calculation and actions should be taken
NED Steering Commitee meeting CERN - 23 February 2006
Conclusions
• The “official” layout Vers. 6.5 seems worst than the old reference case
•Beam screen action must be taken into account (check the last run)• Thermal analysis will complete the study and validate (?) the linear scaling (hope in order to save time and calculations, conversely it can save the quads)
• New layouts by moving the IR toward or far from the IP (according to the beam dynamics) will give godd indications about an “easy way” to get some L increase