Fast Simulation Details in MAENTOUCH Simulation by Giles Qu. and Pascal Vernin

 
MAENTOUCH Simulation
 
Giles Quéméner – IN2P3/LPC Caen
Written in C++ in the ROOT-Cern framework
Allow fast simulations with small details like
mu-metal wires.
 
Expertise from Pascal Vernin – Retired from
CEA Saclay
Many thanks to Pascal and Gilles for their help
 
1
 
Ecran 5.5 x 3.5 m
2
Centre: (1.5,0,2,1.75)
 
Bobines Helmotz
(0,-0.9,1.3)
 
2 boîtes imbriquées
 
2 plans
de PM
Z = 1.70
Z = 3.10
 
Simple geometry
 
2
 
Cut View Y=cste
 
Plaque de répartition
Coussins d’air
 
Plaque de fond
10 mm acier
 
Plaques de toit
2 x 10 mm acier
 
Murs internes
10 mm acier
 
Boîte externe
10 mm acier
Centre = (3.8,0,1.7)
 
3.4 m
 
2.8 m
 
2.2 m
 
0.15 m
 
0.20 m
 
Plans PM
Z=1.7 m
Z=3.1 m
 
3
 
Cut View X=cste
 
Plaque de fond
10 mm acier
 
Plaques de toit
2 x 10 mm acier
 
Murs internes
10 mm acier
 
Boîte externe
10 mm acier
 
0.20 m
 
4.2 m
 
Centre =
(3.8,0,1.7)
 
3.4 m
 
Plans PM
Z=1.7 m
Z=3.1 m
 
 
Only the external blue box and the IN20 wall have been simulated so far
 
4
 
Principle
 
First validation of computed stray field: comparison with the
field map provided by IN20 + independent calculations by P.
Vernin:
 
First trial with standard steel showed that this material is not efficient enough.
 
 all simulations used soft iron.
 
No real 
_r curve implemented. Instead a rather safe 
_r = 2000 is used and
saturation (B>1.5 T) is checked in all cells.
 
 
5
 
Combination of soft iron box and
IN20 wall
 
6
 
Combination of soft iron box and
IN20 wall
 
Example of 4 mm box, 8 mm wall
 
7
 
Mu-metal Shielding
 
Mu-metal cylinder around the PMTs:
 
1.1 mm thick
 = 219 mm
h extended from 201 to 280 mm (but almost no effect at the
level of the cathode and first dynode)
 
5 cm mesh
 
x
 
x
 
x
 
B vs Z computed
along 3 different
lines
 
8
 
Mu-metal Shielding
 
External field:  Bx=0, By=0, Bz=1G
Cylinder + grid + endcap
 
NB: B<0.14 G in whole volume for Bx=1G, By=0, Bz=0
 
Bx
 
By
 
Bz
 
9
 
Mu-metal Shielding
 
External field:  Bx=0, By=0, Bz=1G
Cylinder, no grid, no endcap
 
NB: B<0.14 G in whole volume for Bx=1G, By=0, Bz=0
 
Bx
 
By
 
Bz
 
10
 
Iron + Mu-metal boxes
 
External box, outside the
shielding structure
 
Mu-metal box, tight to the inner
face of the polyethylene
 
11
 
10mm external box + Mu-metal box
 
12
 
Iron + Mu-metal boxes
 
External box, outside the
shielding structure
 
Mu-metal box, fixed to the inner
face of the polyethylene
 
13
 
Margins
 
Tried different thicknesses of iron and mu-metal.
Meet the specification of 0.1 G between 6 and 8
mm of iron combine with 1 to 1.5 mm of mu-
metal.
Current design with 10 mm iron + 1.5 mm mu-
metal.
~0.5 G inside the detector could be acceptable
 
 The design provide some margin but we are
sensitive to gaps between plates at the 2 mm level
 
14
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MAENTOUCH Simulation by Giles Qu. and Pascal Vernin allows for fast simulations with small details like mu-metal wires, featuring expert contributions for validation and optimization using soft iron materials. The simulations cover various geometries, validation of computed stray fields, and combinations of soft iron boxes with IN20 walls. Additionally, mu-metal shielding around PMTs is explored for effective electromagnetic field containment.


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  1. MAENTOUCH Simulation Giles Qu m ner IN2P3/LPC Caen Written in C++ in the ROOT-Cern framework Allow fast simulations with small details like mu-metal wires. Expertise from Pascal Vernin Retired from CEA Saclay Many thanks to Pascal and Gilles for their help 1

  2. Simple geometry 2 bo tes imbriqu es 2 plans de PM Z = 1.70 Z = 3.10 Ecran 5.5 x 3.5 m2 Centre: (1.5,0,2,1.75) z x Bobines Helmotz (0,-0.9,1.3) y 2

  3. Cut View Y=cste Plans PM Z=1.7 m Z=3.1 m 2.8 m Bo te externe 10 mm acier Centre = (3.8,0,1.7) 0.15 m Plaques de toit 2 x 10 mm acier 0.20 m 3.4 m Murs internes 10 mm acier 2.2 m Plaque de fond 10 mm acier Plaque de r partition Coussins d air 3

  4. Cut View X=cste Plans PM Z=1.7 m Z=3.1 m Bo te externe 10 mm acier 4.2 m Plaques de toit 2 x 10 mm acier 3.4 m Murs internes 10 mm acier Centre = (3.8,0,1.7) 0.20 m Plaque de fond 10 mm acier Only the external blue box and the IN20 wall have been simulated so far 4

  5. Principle First validation of computed stray field: comparison with the field map provided by IN20 + independent calculations by P. Vernin: First trial with standard steel showed that this material is not efficient enough. all simulations used soft iron. No real _r curve implemented. Instead a rather safe _r = 2000 is used and saturation (B>1.5 T) is checked in all cells. 5

  6. Combination of soft iron box and IN20 wall Box (mm) Wall (mm) Saturation In wall Force on coils (N) Max field (G) 6 6 yes - 4 8 no - 1.6 G 6 8 no 165 1.3 G 6 10 no 173 1.2 G 6

  7. Combination of soft iron box and IN20 wall Example of 4 mm box, 8 mm wall 7

  8. Mu-metal Shielding Mu-metal cylinder around the PMTs: 1.1 mm thick = 219 mm h extended from 201 to 280 mm (but almost no effect at the level of the cathode and first dynode) x xx B vs Z computed along 3 different lines 5 cm mesh 8

  9. Mu-metal Shielding External field: Bx=0, By=0, Bz=1G Cylinder + grid + endcap NB: B<0.14 G in whole volume for Bx=1G, By=0, Bz=0 Bx Bz By 9

  10. Mu-metal Shielding External field: Bx=0, By=0, Bz=1G Cylinder, no grid, no endcap NB: B<0.14 G in whole volume for Bx=1G, By=0, Bz=0 Bx Bz By 10

  11. Iron + Mu-metal boxes External box, outside the shielding structure Mu-metal box, tight to the inner face of the polyethylene 11

  12. 10mm external box + Mu-metal box 12

  13. Iron + Mu-metal boxes External box, outside the shielding structure Mu-metal box, fixed to the inner face of the polyethylene 13

  14. Margins Tried different thicknesses of iron and mu-metal. Meet the specification of 0.1 G between 6 and 8 mm of iron combine with 1 to 1.5 mm of mu- metal. Current design with 10 mm iron + 1.5 mm mu- metal. ~0.5 G inside the detector could be acceptable The design provide some margin but we are sensitive to gaps between plates at the 2 mm level 14

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