Connection Cryostats:status of bus bars studies

Report to nMPP

V.Parma, P.Borowiek, C.Maglioni

7th April 2009

MECHANICAL CALCULATIONSOF BB DEFLECTIONS

C.Maglioni, MSC-IC

Observations in 11L6 (J.-Ph.T. & C.)

1 2 3 4 5 6 1 2 3 4 5 6 7FP

Modelling of bus bars constraints

Electro-magnetic forces

Comsol Multi-physics• In-plane mechanical model • Proportional to I2

• Inv. proportional to distance

J.-Ph.Tock, 9th March ‘09

1 2 3 4 5 6 1 2 3 4 5 6 7

Fixed Point

Sliding Support

FP

0(1’000)

2’070(860)

LE.L5 (Long)

1440(1’000)

850(1’000)

1’060(1’000)

??(1’000)

??(1’000)

550(1’000)

??(1’000)

??(1’000)

??(1’000)

??(850)

M3

state on 06 April 2009, modified by Pawel Borowiec

09Apr2008

Sector cold

Powered 22 times on RB (<10.3kA), 14 times on RQs (<10.9 kA)

1 2 3 4 5 6 1 2 3 4 5 6 7

Fixed Point

Sliding Support

FP

970(1’000)

??(389)

LE.L6 (Short)1’010

(1’000)1520

(1’000)440

(1’000)1’000

(1’000)1’000

(1’000)860

(1’000)110

(1’000)1’870

(1’000)920

(1’000)450

(379)

M1

state on 06 April 2009, modified by Pawel Borowiec

31Mar200913Feb2009640

(500)

bent

bu

s-ba

r

400(500)

130??

(100)

1 2 3 4 5 6 1 2 3 4 5 6 7FP

?? (1’000)

??(389)

??(1’000)

??(1’000)

??(1’000)

990(1’000)

1’000(1’000)

??(1’000)

1’200(1’000)

1’010(1’000)

920(1’000)

480(379)

M231Mar2009??

(500)500

(500)110

(100)

To be measured again

1 2 3 4 5 6 1 2 3 4 5 6 7FP

1280(1’000)

??(389)

1’260(1’000)

680(1’000)

640(1’000)

1’000(1’000)

780(1’000)

1’040(1’000)

80(1’000)

2’160(1’000)

480(1’000)

890(379)

M3640

(500)

160??

(100)

31Mar200913Feb2009

Sector warmPowered 105 times on RB (<11.2kA), 76 times on RQs (<11.3kA)

Quad. BB max. deflection as a function of Support spacing and current

Summary of mechanical calculation• With nominal spacing:

– M1, M2 (quad BB): elesticity marginal @ 5TeV; some plastic def. at ultimate; deflections well within tube diameter

– M3 (dip. BB): within elastic domain up to ultimate; deflections well within tube diameter

• Maximum acceptable supports spacing (tube contact) for quad BB (limiting as compared to dip. BB):– @ 5 TeV: up to ~1.55 m– @ nominal: up to ~1.33 m– @ ultimate: up to ~1.3 m