Design options for DUNE Near Detector Magnet Udai Giri P.S Sachan, - - PowerPoint PPT Presentation

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Design options for DUNE Near Detector Magnet Udai Giri P.S Sachan, - - PowerPoint PPT Presentation

Feb 02, 2023 48 likes •229 views

Design options for DUNE Near Detector Magnet Udai Giri P.S Sachan, S.Sundar Rajan, Sanjay Malhotra Bhabha Atomic Research Centre India Near Detector Workshop: Magnet Systems Near Detector Workshop: Magnet Systems September 3-6, 2019, Fermilab

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SLIDE 1

Design options for DUNE Near Detector Magnet

Udai Giri P.S Sachan, S.Sundar Rajan, Sanjay Malhotra Bhabha Atomic Research Centre India

Near Detector Workshop: Magnet Systems Near Detector Workshop: Magnet Systems September 3-6, 2019, Fermilab

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SLIDE 2

Outline

2

  • Detector magnet requirements
  • DUNE Magnet Design Options: Three Coils along with Shield

Coils

  • Magnetic field uniformity
  • Stray field & Peak field
  • Superconductor Options
  • Summary

Near Detector Workshop: Magnet Systems 04-Sep-19

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SLIDE 3

DUNE Near Detector Magnet Design

04-Sep-19 3 Near Detector Workshop: Magnet Systems

Requirements:*

  • Central Magnetic Field : B(0,0,0) ~ 0.5T
  • Magnet Diameter : >7 m
  • Magnet Length: less than 10m
  • Fringe Field :B(6,0,0) < 50 Gauss (5mT)
  • Uniformity :< 20% in DSV of 5.2 m

* As per DUNE-ND magnet meetings

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SLIDE 4

Magnetic Field uniformity in Two coil vs Three coil Design

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DSV : 2.4m DSV : 2.95m DSV : 2.8m DSV : 3.5m

Helmholtz Coil Three Coil ± 1% ± 2%

Near Detector Workshop: Magnet Systems 04-Sep-19

Better Uniformity can be achieved with 3 coil design

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SLIDE 5

Three Coil Configuration with shield coils

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Iop=5000A

Main Coil Side Coil Bucking Coil

Near Detector Workshop: Magnet Systems 04-Sep-19

  • Distance between

main coil to side coil 2.3 m

  • Distance between

main coil to buck coil 4.37 m

  • Main coil ID:7.1m
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SLIDE 6

Detector Magnet Three Coil Configuration-Option1

6 Near Detector Workshop: Magnet Systems 04-Sep-19

B(0,0,0)=0.5 T

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SLIDE 7

Design Option-1: Field Uniformity

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B(0,0,0)=0.5 T Buniformity= 21%

Near Detector Workshop: Magnet Systems 04-Sep-19

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SLIDE 8

Design Option1- Stray Magnetic Field

8 Near Detector Workshop: Magnet Systems 04-Sep-19

B(0,0,6)=0.007 T

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SLIDE 9

Design Option1- Peak Magnetic Field

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Bpeak=4.5 T Stored Energy = 118 MJ Forces on the Coil Side Coils: Fz= 3.62MN Bucking Coils : Fz=8.18MN

Near Detector Workshop: Magnet Systems 04-Sep-19

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SLIDE 10

Detector Magnet Three Coil Configuration-Option 2

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B(0,0,0)=0.45 T

Near Detector Workshop: Magnet Systems 04-Sep-19

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SLIDE 11

Field Uniformity Configuration-02

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B(0,0,0)=0.45 T Buniformity= 17%

Near Detector Workshop: Magnet Systems 04-Sep-19

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SLIDE 12

Stray Magnetic Field Configuration-02

12 Near Detector Workshop: Magnet Systems 04-Sep-19

B(0,0,6)=0.02 T

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SLIDE 13

Peak Magnetic Field

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Bpeak=4.7 T Stored Energy = 112 MJ Forces on the Coil Side Coils: Fz= 2.97 MN Bucking Coils : Fz=5.98 MN

Near Detector Workshop: Magnet Systems 04-Sep-19

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SLIDE 14

14 Near Detector Workshop: Magnet Systems 04-Sep-19

Magnet Design Options comparison

Magnet Parameters Design option-1 Design Option-2 Magnet ID (m) 7.1 7.1 7.8 7.1 7.1 8.2 Length(m) 0.085 0.2 0.145 0.085 0.2 0.1 Number of turns 112 481 270 112 481 252 Length of cable (km) 36 38 Operating current(A) 5000 5000 Bpeak (T) 4.5 4.7 Stored energy(MJ) 118 112 Overall Magnet Length(m) 9 10 Bstray (Gauss) 70 200 Uniformity 21% 17 %

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SLIDE 15

Conductor Selection

15 RIC Conductor used in 11.75 Tesla Iseult MRI Magnet Piece Length : 1.6 Km Lead Time : 9 Months Price : $ 30/m

Conductor Type Cable in channel Bare Dimension (mm) 9.18 x 4.88 No of SC strands in cable 10 No of filaments in each strand 480 Cu/SC of SC Strand 1.23 Filament Diameter 37 microns Filament twist 50 mm Overall Cu/SC 10 Ic (5T, 4.2K) > 10,000A RRR > 100 0.2% Yield Strength > 200 MPa

Ref: “ Production Results of 11.75 Tesla Iseult/INUMAC MRI Magnet conductor at Luvata “, H.Kanithi , D Blasiak , J.Lajewski , C.Berriaud

Near Detector Workshop: Magnet Systems 04-Sep-19 Rutherford cable extruded with high purity Al Price : $ 60/m

Option:1 Option:2

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SLIDE 16

Cooling Scheme

16

  • The coils will be conduction cooled through pipe which are

wounded on its OD.

  • Indirect cooling through two phase thermosiphon cooling loops

Main coil Side coil 1 Side coil-2 Bucking coil-1 Bucking coil-2 Liquid helium inlet header Gas helium outlet header

Cryostat

Near Detector Workshop: Magnet Systems 04-Sep-19

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SLIDE 17

Summary & Future Work

17

  • Preliminary design of Three coil along with shield coils

configuration based DUNE near detector magnet is carried out

  • We would like to part of this magnet development collaboration

and wish to take detailed design of the magnet.

Near Detector Workshop: Magnet Systems 04-Sep-19

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SLIDE 18

18 Dune Near Detector Magnet Meeting

Thank you

04-Sep-19