BI.BSW Chicane Magnets reviewD. Aguglia, B. Balhan, J. Borburgh,

C. Bracco, B. Goddard, D. Nisbet

Review follow up on PSB 160 MeV H- injection

Contents

• Bump closure• Influence from the main dipoles• Multi turn (>2) variants feasibility• Chicane powering

20/3/2012 J. Borburgh BSW magnets 2

Review follow up on PSB 160 MeV H- injection

Bump closure simulation 1/3 (action 6,7,8)

20/3/2012

•4 BSW’s (1 ring) modelled in single FE model (Vector Fields).

•No cross talk between magnets observed.

•Bump closure simulated at nominal current: bump is closed within the accuracy of the model (mesh size ~2mm). Complete field map available.

J. Borburgh BSW magnets 3

Review follow up on PSB 160 MeV H- injection

Bump closure simulation 2/3

20/3/2012 J. Borburgh BSW magnets 4

Not to scale

Review follow up on PSB 160 MeV H- injection

• The non-closure amplitude is estimated assuming 66 mrad deflection and 6 m average H beta function, with uncorrelated errors

• *Note that for the vertical orbit non-closure, the roll angle tolerance of the dipole magnets is about 1 mrad (much more sensitive)

• Tolerances are typically 1e-3, and 1 mrad alignment, except yaw which can be 20-30 mrad

• Tracking accuracy of individual supplies will need to be better than 1e-3

Bump closure 3/3required/assumed tolerances

error name value unit Effect (H orbit) mmdB/B0 transfer function 1 ‰ 0.40dI/I0 PC accuracy 1 ‰ 0.40dφ* roll angle 30 mrad 0.18dθ yaw angle 30 mrad 0.18dS Longitudinal position 3 mm 0.20

1 magnet 0.654 magnets 1.30

20/3/2012 J. Borburgh BSW magnets 5

Review follow up on PSB 160 MeV H- injection

Influence of the main dipoles (action 8, 22)

20/3/2012

• A very large model with a ¼ of BHZ and BS1(ring 3 and 4) was created in Vector Fields.

• Field has been analysed to study effect on BS1 at injection (160 MeV).

• Model was made available to the MSC group to assess the impact of the BSW’s on the BHZ.

J. Borburgh BSW magnets 6

Review follow up on PSB 160 MeV H- injection

Influence of BHZ on BS1 at injection

• Small reduction of ∫B.dl of BSW (~3‰)

• Very limited effect on field homogeneity

• Effect on BS4 still to be quantified

• Complete field map available

20/3/2012

650 750 850 950 1050 1150 1250 1350 1450

-3.00E-01

-2.00E-01

-1.00E-01

0.00E+00

1.00E-01

2.00E-01

3.00E-01

4.00E-01

Magnetic Flux density (By) along axe

BHZ & BS1

BS1 for reference

mm

T

J. Borburgh BSW magnets 7

Review follow up on PSB 160 MeV H- injection

BSW1 BSW2 BSW4

# turns 2 4 8 8

I [kA] 13.5 6.8 3.4 3.4

Field homogeneity ±1 % ±1 % ±1 %

Resistance (mΩ) 0.8 1.5 3 3

Inductance (μH) 3.2 13 66 77

Multi-turn BSW variants (action 9)

20/3/2012

• 8 turn version feasible for window frame variants (BSW2,3,and4).

• Only 2 or possibly 4 turn variant possible for septum (BSW1). Depending on leak field requirements (still to be defined and calculated).

J. Borburgh BSW magnets 8

Review follow up on PSB 160 MeV H- injection

Chicane powering (action 5) 1/3

• 2 different nominal currents (BSW1 and BSW2-4), with separate power supplies for each.

• Current setting individually adjustable for each magnet (±5% w.r.t nominal setting).

• Transformers in tunnel from BSW1’s (4 in total) in case 2 turn magnets. Transformers might be put farther from injection area in case of 4 turn magnets.

• No transformers needed in tunnel for 8-turn BSW’s.

20/3/2012 J. Borburgh BSW magnets 9

Review follow up on PSB 160 MeV H- injection

Chicane powering (action 5) 2/3

• Powering solution 1– BSW1 at 13.5kA individual (4x), BSW2,3&4 3.4 kA

individual (12x).• Powering solution 2

– BSW1 at 13.5kA individual (4x), BSW2&3 3.4 kA in series (4x), BSW4 3.4 kA individual (4x).

• Powering solution 3– BSW1 power supplies 13.5 kA (4 x), BSW2-4 power

supplies 3.4 kA (4 x), Trim power supplies for BSW4 and BSW3 (200A, 8 x).

20/3/2012 J. Borburgh BSW magnets 10

Chicane powering (action 5) 3/3

• Possible circuit diagrams

20/3/2012 Review follow up on PSB 160 MeV H- injection

• Powering solution 1: full optics control, Power conv. low development risk, the most voluminous.• Powering solution 2: reduced optics control, Power conv. low development risk, less voluminous w.r.t.

solution 1.• Powering solution 3: full optics control, Power conv. increased development risk, least voluminous

solution, more complex controls, NEEDS MORE DEVELOPMENT EFFORTS.

Building 361

PSB tunnel

BSW1 BSW2 BSW3 BSW4Tr1

BSW1Power(ring 1)

BSW2,3&4Power(ring 1)

BSW4Trim

(ring 1)BSW3Trim

(ring 1)

Building 361

PSB tunnel

BSW1 BSW2 BSW3 BSW4Tr1

BSW1Power(ring 1)

BSW2Power(ring 1)

BSW3Power(ring 1)

BSW4Power(ring 1)

Building 361

PSB tunnel

BSW1 BSW2 BSW3 BSW4Tr1

BSW1Power(ring 1)

BSW2Power(ring 1)

BSW4Power(ring 1)

Solution 1

Solution 2 Solution 3

J. Borburgh BSW magnets 11