INTERNATIONAL LARGE DETECTOR CONCEPT Magnetic System Overview Solenoid

INTERNATIONAL LARGE DETECTOR CONCEPT Magnetic System Overview Solenoid and Anti-DID Olivier Delferrière, François Kircher Centre d'Etudes de Saclay (CEA-Saclay) SACM ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 1

Summary Introduction 1. Version « ILD-V 5 Saclay » for the Solenoid configuration Optimized solution without anti-DID Homogeneous field in the TPC volume 2. Introduction of the Anti-DID coil design – Brett Parker design Air-coil and anti-DID in ILD design comparison TPC Field Homogeneity study: Correction coils and anti DID Conclusions and remarks SACM ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 2

Introduction § New detector concept for ILC: ILD = mixture of GLD and LDC Saclay ILD electromagnetic simulations by : O. Delferrière, F. Kircher ILD V 5 – Saclay version = last version before LOI 2 D axisymmetric electromagnetic simulations (OPERA-2 D©) for : § § § 1) 2) Stray field optimization including all gaps TPC homogeneity without anti-DID BARREL YOKE 12 -fold shape. It is longitudinally split into three parts. In the radial direction, the inner part of the yoke is made of 10 iron plates, with a space of 40 mm between each to house the muon detectors. 3 external thick plates, each 560 mm thick with 40 mm space in between, make up the total iron thickness. END CAP YOKE 12 -fold shape, similar split structure, with 10 iron plates in the inner part, with a space of 40 mm between each to house the muon detectors, and 2 external thick plates, each 560 mm thick, to make up the total iron thickness. FIELD SHAPING PLATE A 100 mm thick field shaping plate (FSP) will be added inside each end cap to improve the field homogeneity. § SACM 3 D electromagnetic simulation for TPC homogeneity with anti-DID (OPERA-3 D/TOSCA©) – cylindrical geometry assumed Simplified geometry without all the 40 mm internal gaps for muon detectors Only the main “mechanical gaps” ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 3

ILD cross section Solenoïd 5 -module coil (5 layers) Barrel Yoke Anti-DID Endcaps 7755 6595 5995 4595 4340 4000 3615 3440 3240 Correction currents Cryostat vacuum tank Correction currents 1800 TPC IP 550 SACM 6 0 62 60 54 60 60 40 39 50 22 0 (IP) FSP ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Yoke front Yoke back Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 4

2 D up to date cross section for OPERA-2 D simulations Beam axis Central field (T) Maximum field on conductor (T) Stored energy (GJ) Stored energy per unit of cold mass (k. J/kg) Main coil current (k. A) Extra correction current (k. A) Ampere-turns main coil (MAt) Ampere-turns correction coils (MAt) 3. 5 (500 Ge. V op. ) 4. 82 2. 1 9. 0 15. 8 16. 2 19. 4 6. 5 4. 0 (design) 5. 50 2. 7 11. 9 18. 4 22. 5 7. 4 ILD V 5 Saclay SACM ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 5

Homogeneity criteria Field homogeneity: homogeneous field in the volume of the TPC: z max l (R) = ∫ (Br (R) / Bz (R) dz 0 within the TPC volume: z max = 2. 25 m R max = 1. 8 m The field homogeneity is adjusted with a FSP (Field Shaping Plate) and correction currents in some places of the coil at both ends. SACM ILD Workshop 2010, Paris Initial requirements : Field homogeneity for ILD : l (R) < 10 mm 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 6

Optimized results@3. 5 T without anti-DID 200 Gauss limit 4. 8 T on conductors (@3. 5 T on axis) B on axis TPC homogeneity (Br/Bz) vs r (z=0 to 2. 25 m) Br/Bz(z=0 to 2. 25 m) for r=0 to 1. 8 m SACM ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 7

Anti DID coil definition (Brett Parker-August 2008) SACM In the ILD design the outer radius of solenoid coil is : Rout= 4. 00 m External radius of the Anti-DID has been extend to: RAD=4. 3 m The thickness and width are unchanged : 10 mm, 175 mm Distance between solénoid anti-DID: 0. 3 m has to be optimized ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 8

Anti DID coil definition (Brett Parker) Design might not be optimized for the actual ILD Magnet ? SACM ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 9

Anti-DID in ILD V 5 - Saclay 8, 00 E-02 BX(With Yoke, Solenoïd ON) 6, 00 E-02 BX(Without Yoke) 4, 00 E-02 2, 00 E-02 J=75 A/mm² -10000 0, 00 E+00 -5000 0 5000 10000 -2, 00 E-02 -4, 00 E-02 -6, 00 E-02 SACM ILD Workshop 2010, Paris -8, 00 E-02 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 10

Simplified iron geometry for Solenoid+Anti DID Component from anti-DID: Bx Y q Cylindrical symmetry broken Component from solenoïd: Bz X Look at: Xo. Z plane Yo. Z plane And in between (Q) SACM ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 11

Br and Bq Y ∫(Br/Bz)dz=cste q q X Y ∫(Br/Bz)dz increased by Bx from Anti-DID ∫(Br/Bz)dz same as before for q=90° (yoz plane) SACM q X Also look at ∫(Bq/Bz)dz for q=90° (yoz plane) B -Bx ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 12

Anti-DID in ILD SACM ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 13

∫(Br/Bz)dz =∫(Bx/Bz)dz for =0° Solenoid + Icor, no anti-DID ∫(Br/Bz)dz 12 Int(Bx/Bz) (mm) 10 8 6 4 2 X (mm) (Y=0) 0 0 ∫(Br/Bz)dz =∫(By/Bz)dz for =90° r 1000 2000 12 (mm) Int(By/Bz) 10 8 6 4 2 SACM Y (mm) (X=0) 0 0 ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project 1000 Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 2000 14

∫(Br/Bz)dz =∫(Bx/Bz)dz for =0° Solenoid Icor=0, no anti-DID ∫(Br/Bz)dz 60 Int(Bx/Bz) (mm) 50 40 30 20 10 X (mm) (Y=0) 0 0 1000 2000 60 Int(By/Bz) (mm) ∫(Br/Bz)dz =∫(By/Bz)dz for =90° r 50 40 30 20 10 Y (mm) (X=0) 0 0 1000 2000 SACM ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 15

∫(Br/Bz)dz =∫(By/Bz)dz for =90° Solenoid + Icor + anti-DID ∫(Br/Bz)dz 12 Int(By/Bz) (mm) 10 8 6 4 2 Y (mm) (X=0) r 0 0 1000 2000 ∫(Br/Bz)dz =∫(Bx/Bz)dz for =0° 0 -5 0 1000 2000 -10 Int(Bx/Bz) (mm) -15 -20 -25 -30 SACM -35 -40 ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project X (mm) (Y=0) Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 16

∫(Br/Bz)dz =∫(By/Bz)dz for =90° Solenoid Icor=0, + anti-DID ∫(Br/Bz)dz 60 Int(By/Bz) (mm) 50 40 30 20 10 Y (mm) (X=0) 0 0 r ∫(Br/Bz)dz =∫(Bx/Bz)dz for =0° 1000 2000 5 (mm) Int(Bx/Bz) 0 0 -5 -10 -15 -20 SACM -25 X (mm) (Y=0) -30 ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 17

Solenoid + Icor + anti-DID: ∫Br/Bz. dz and ∫Bq/Bz. dz ∫Br/Bz. dz ∫B /Bz. dz SACM ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 18

Correction currents and Anti-DID Summary ∫Br/Bz. dz Solenoid +correction No Anti-DID Solenoid No correction No Anti-DID Solenoid + correction + Anti-DID Solenoid No correction +Anti-DID 10 mm 50 mm -35 < <10 mm -25< <50 mm Same effect on ∫Bq/Bz. dz So: Main questions are: SACM If anti-DID, do we need correction currents ? And: Do we really need Anti-DID if we ask for homogenous field? ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 19

Conclusions and remarks -Yoke dimension & Solenoid coil dimensions frozen -Anti-DID first simulation with solenoid and yoke Homogenous field is lost -No optimization of Anti-DID position, geometry or current since first design of Brett Parker. -Optic simulations are underway at Saclay : Reine Versteegen, Ph. D , «Conception et Optimisation de la Région d'Interaction d'un futur collisionneur linéaire électron-positon » . -Preliminary results show that the strength of the anti-DID seems oversized. - More optics calculations are needed to optimize the anti-DID. SACM -Correction coils increase the peak field, the stored energy and the forces and stress. They need extra hardware (conductor with higher current, current leads, power supply, electrical circuit, instrumentation). This has non negligible consequences on the cost and safety of the magnet. -Consequently, the settling of the correction coils must be strongly justified. ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 20

Thank you for your attention SACM ILD Workshop 2010, Paris 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 21

Reine Versteegen ILD Solenoid : Solenoid field lines: x (m) Bz (T) 7 mrad z (m) Solenoid+Anti-DID field lines: Anti-DID : x (m) Bx (T) 7 mrad z (m) SACM ILD Workshop 2010, Paris z (m) 27 -30 2010, S 3 January Project Couvent des cordeliers 15 rue de l'École de Médecine 75006 PARIS FRANCE 22