Helene Felice

02/15/2013HiLumi Meeting

HQ Program

HQ02Plans for assembly

H. Felice 2

Outline

• Magnet overview

• HQ02 Assembly plan - Key focus areas

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• Assembly: timeline

H. Felice 3

Overview of the HQ magnet parameters

4.3 K 1.9 K

Typical Iss 17.3 kA 19 kA

Gradient at Iss 195 T/m 213 T/m

Peak Field at Iss 13.6 T 14.8 T

Stored energy at Iss 0.9 MJ 1.1 MJ

Fx per octant per unit length at Iss 2.7 MN/m 3.15 MN/m

Fy per octant per unit length at Iss -3.9 MN/m -4.7 MN/m

Fz per magnet end at Iss 1.06 MN 1.28 MN

In absence of HQ02 short sample limit, the HQ01e numbers will be used as references in these slides

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H. Felice 4

Structure and assembly steps overview

Collar-pack assembly• 4 collars bolted against the full length G10 keys• Shimming of the alignment key to ensure contact between

collar and keys

Coil-pack assembly• 4 pads bolted around the collars

Final assembly and loading• Master/bladders and Keys stack is prepared based on coil-

pack assembly • Insertion of the coil-pack in the yoke shell sub-assembly by

sliding on the bottom masters• Insertion of the side and top masters • Masters include load keys and bladders + pull shims

Key parameters to watch• Preload level• Alignment: collar and key must be in contact• Preload uniformity

Collar pack assembly

Coil-pack assembly

Bladder slot Master

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H. Felice 5

HQ02 Azimuthal Preload Target

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Conservative Target preload ~ 200 T/m

Target Preload at 300 K:• eq shell / pole = 863 me / -450 me• sq shell / pole = 66 /-63 MPa

Target Preload at 4.2 K:• eq shell / pole = 1905 me / -720 me • sq shell / pole = -169 / -147 MPa

Room temperature preload transfer function

H. Felice 6

Focus area # 1: Alignment (I)

Different transfer function depending on:• collar / key contact or absence of contact

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Room temperature preload transfer function

H. Felice 7

Focus area # 1: Alignment (II)

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• HQ01a-b: no alignment• HQ01c-d-e: alignment• Importance of key/collar shimming• Use of pins and feeler gauges to quantify gaps

Different transfer function depending on:• collar / key contact or absence of contact

Room temperature preload transfer function

H. Felice 8

Focus area #2Preload distribution and uniformity

Previously HQ assemblies and previous LARP magnets exposed the importance of matching the coil OD to the collar/pad ID

• Preload distribution on the coil OD can be controlled by adjusting the radial shims• Attempt to correlate with CMM measurements

• Adjustment made using Fuji pressure sensitive film during collar pack assembly• 2 IR collars available

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H. Felice 9

Focus area #2Preload distribution and uniformity among coils

HQ01d HQ01e

sθ = -43 20 MPa sθ = -62 6 MPa

ExcitationCoil 8

Assembly Assembly

ExcitationCoil 8

Adaptive shimming made based on coil pole SG readings improved preload uniformity among coils

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H. Felice 10

Focus Area #3

• Apply a conservative preload to avoid degradation

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H. Felice 11

HQ02 Preload Target summary

Conservative Azimuthal Target preload ~ 200 T/m

Target Preload at 300 K:• eq shell / pole = 863 me / -450 me• sq shell / pole = 66 /-63 MPa

Target Preload at 4.2 K:• eq shell / pole = 1905 me / -720 me • sq shell / pole = -169 / -147 MPa

Axial Preloadsz rod = 60 / 160 MPaAxial preload was never an issue in HQ

• Fuji paper used to evaluate ideal radial shimming

• Adaptive shimming is a possible option if spread between SG is larger than 10 MPa

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H. Felice 12

Timeline

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By the end of the week: coil arrangementWeek of 02/18/2013:Iteration on collar pack assembly

Week of 02/25/2013• Coil pack finalized• Electrical QA of the coil-pack• Coil pack insertion in the yoke-shell sub-assembly• Coil end-shoe preparation for axial pushers and bullets

Week of 03/04/2013• Azimuthal and axial Preload

Starting week of 03/11/2013• Electrical QA before pizza-box assembly• Pizza-box assembly• Instrumentation prep for testing at FNAL• …

Additional Material

H. Felice 14

Coil pole SG during assembly

HQ01c

HQ01d

HQ01e

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H. Felice 15

Shell SG during assembly

HQ01c

HQ01d

HQ01e

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H. Felice 16

HQ01d Coil sq distribution

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H. Felice 17

HQ01 baseline

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H. Felice 18

Azimuthal HQ01a Preload Targets

• Initial preload target based on Gss = 219 T/m at 19.6 kA (design values)

• Targets: • eq shell = 1028 me at 300 K and 2086 me at 4.2 K• eq pole = -536 me at 300 K and -828 me at 4.2 K

In terms of stress• sq shell = 78 MPa at 300 K and 185 MPa at 4.2 K• sq pole = -76 MPa at 300 K and -159 MPa at 4.2 K

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