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LQ Goals & Design Summary Giorgio Ambrosio

LARP 9th Collaboration Meeting Oct. 17-19, 2007

OUTLINE:

• LQ goals • LQ design status

LQ Goals and Design Study Summary – G. Ambrosio 2LARP Collab Mtg – SLAC, Oct. 17-19, 2007

LQ Goals

GOALS:• Gradient: 200+ T/m• Aperture: 90 mm• magnet length: 4 m

Timeframe:• Performance and reproducibility

by the end of 2009

LQ Goals and Design Study Summary – G. Ambrosio 3LARP Collab Mtg – SLAC, Oct. 17-19, 2007

LQ Goals +

• The LQ may also be an opportunity to test some accelerator features (such as alignment, unrestricted cooldown) in long Nb3Sn magnets

Questions for discussion:

What features?

Is this important, necessary, negligible?

Could an LQ with accelerator features

become QA?

LQ Goals and Design Study Summary – G. Ambrosio 4LARP Collab Mtg – SLAC, Oct. 17-19, 2007

The Road to the LQ

TechnologicalQuadrupoles,

LQ task (FY08)

Long Quad.Design Study

Long Racetrack Long mirror

Long Quadrupole

Practice coils

LQ01, LQ02, LQ03

LQ Goals and Design Study Summary – G. Ambrosio 5LARP Collab Mtg – SLAC, Oct. 17-19, 2007

Magnetic Design

• Coil layout = TQs

• Iron yoke design depends on mechanical structure– Collar design with iron

yoke up to the ends

– Shell design may have ss pads

Parameter Unit TQC TQS

N of layers - 2

136

29.33

N of turns -

Coil area (Cu + nonCu) cm2

4.2 K temperature

Quench gradient T/m 221 234

Quench current kA 13.3 13.2

Peak field in the body at quench T 11.5 12.0

Peak field in the end at quench T 11.9 11.8

Inductance at quench mH/m 4.56 5.03

Stored energy at quench kJ/m 406 438

1.9 K temperature

Quench gradient T/m 238 252

Quench current kA 14.4 14.4

Peak field in the body at quench T 12.4 12.9

Peak field in the end at quench T 12.9 12.7

Stored energy at quench kJ/m 472 511

LQ Goals and Design Study Summary – G. Ambrosio 6LARP Collab Mtg – SLAC, Oct. 17-19, 2007

Conductor

• Cable:– LQ cable design = TQ cable design

• Strand: – RRP 54/61 for LQ01

• Strand used in TQS02 coils (also in TQE02) and LR

• Good performance at 4.5K

• Limited performance at 1.9K under investigation

– Higher number of subelements considered for following LQs

• Options: 114/127, 108/127, …

• Possible CERN-LARP collab.

More info and discussion in the Materials session

LQ Goals and Design Study Summary – G. Ambrosio 7LARP Collab Mtg – SLAC, Oct. 17-19, 2007

Mechanical Design

TQC Hybrid design TQS

Coil

Axial rod

Shell

Bladder

Key

Yoke

Pad

FillerCoil

Axial rod

Shell

Bladder

Key

Yoke

Pad

Filler

Both TQ designs are options for the LQ,

the hybrid design cannot be considered because lacking short models

LQ Goals and Design Study Summary – G. Ambrosio 8LARP Collab Mtg – SLAC, Oct. 17-19, 2007

Mechanical Design

• Following presentations will show details of the LQ Support Structure options

• LQ Support Structure Review – Nov 28-29, at BNL

– Originally thought of as Selection Review,

– Presently considered as Plan Review

More on these topics at the end of the session

LQ Goals and Design Study Summary – G. Ambrosio 9LARP Collab Mtg – SLAC, Oct. 17-19, 2007

Coil Fabrication Technology

• LQ coils = TQ coils + minor modifications– Pole material: Ti-Al-V (as TQS02 coils, also used in TQE02)

– Ground insulation: Kapton wrap (as TQC coils)• 1 kV Hi-pot test

– Soldering to traces outside of the magnet (new features)

– Outer layer glued to the coil (as TQS coils)

– Pins to lock inner and outer layer• Goal: to improve coil fabrication process reliability

– Insulation: LQ01 will use TQ sleeve• Tested also on LR

NbTi leads: 0.7 1 mm ?

LQ Goals and Design Study Summary – G. Ambrosio 10LARP Collab Mtg – SLAC, Oct. 17-19, 2007

Quench Protection

• Goal: – MIITs < 7.5 Temp < 380 K

• Quench protection parameters (4.5 K)– Dump resistance: 60 m(extract ~1/3 of the energy; Vleads ~ 800 V)

– 100% heater coverage ( heaters also on the inner layer)

– Detection time: ~5 ms based on TQs with I > 80% ssl

– Heater delay time: 15 ms based on TQs with I > 80% ssl

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

0 2000 4000 6000 8000 10000 12000

Current (A)

|Vo

lta

ge

Sp

ike

| (m

V)

White = After FilterAll other Colors = Before Filter

LQ Goals and Design Study Summary – G. Ambrosio 11LARP Collab Mtg – SLAC, Oct. 17-19, 2007

Coil Instrumentation (…in progress)

Voltage taps:– Inner layer: 4 VTs more than TQC (+5-1)

• Goals : splice, pole-midplane blocks, pole turn (lead end, return end, layer-ramp, straight section), 2nd turn

– Outer layer: Same as TQs • Goals: splice, pole turn (lead end, return end, layer-ramp)

• Strain gauges as TQS• Protection heater on both layers• Will need two traces (1.5 m each) for layer

– May still be too much… Work in progress

• Bubbles: plan tests at 4.5, 2.5 K and 1.9K (at the end)– Bubble proof heater design?

LQ Goals and Design Study Summary – G. Ambrosio 12LARP Collab Mtg – SLAC, Oct. 17-19, 2007

Next

• Complete LQ Design Study Report before the LQ Support Structure Review

DESIGN STUDY OF THE LARP LONG QUADRUPOLE

TABLE OF CONTENTS

1. INTRODUCTION G. Ambrosio 2. CONDUCTOR CHARACTERISTICS Introduction A. Ghosh Strand E. Barzi Cable D. Dietderich 3. MAGNETIC DESIGNS Collar-based design V. Kashikhin Shell-based design P. Ferracin 4. COIL DESIGN AND FABRICATION F. Nobrega, and J. Schmalzle 5. COIL INSTRUMENTATION ??? 6. MECHANICAL DESIGNS Collar-based structure R. Bossert, and I. Novitski Shell-based structure P. Ferracin, and S. Caspi Hybrid structure J. Schmalzle, and M. Anerella 7. MAGNET ASSEMBLY Collar-based structure F. Nobrega, and R. Bossert Shell-based structure P. Ferracin, and S. Caspi Hybrid structure J. Schmalzle, and M. Anerella 8. QUENCH PROTECTION G. Ambrosio, J. Muratore, A. Lietzke, A. McInturff, M. Lamm 9. PLANS FOR FABRICATION AND TEST G. Ambrosio

LQ Goals and Design Study Summary – G. Ambrosio 13LARP Collab Mtg – SLAC, Oct. 17-19, 2007

Next talks

Session 5B Magnets - LQ session1 Chair Ambrosio Redwood Room- C/ D

9: 00 9: 20 Ambrosio LQ goals and DS summary

9: 20 9: 40 Schmalzle LR summary and LQ work at BNL

9: 40 10: 00 Nobrega LM summary and LQ work at Fermilab

10: 00 10: 20 all Discussion

10: 20 10: 35 Coffee

Session 6B Magnets - LQ session2 Chair Ambrosio Redwood Room- C/ D

10: 35 10: 55 Ferracin LQ support option - segmented shell

10: 55 11: 15 Bossert LQ support option - collars

11: 15 11: 35 Ambrosio LQ plans

11: 35 11: 55 all Discussion

LQ Goals and Design Study Summary – G. Ambrosio 14LARP Collab Mtg – SLAC, Oct. 17-19, 2007

Appendix

LQ Goals and Design Study Summary – G. Ambrosio 15LARP Collab Mtg – SLAC, Oct. 17-19, 2007

LQ inner layer

NEW NEW

NEW NEW

GOALS:Splice: A1-A2; pole-midplane blocks: A3&A5 (redundancy); lead end: A6-A7 Return end: A8-A9; layer-ramp: A10; straight section vs. ~ends: 4 VTs NEW 2nd turn: NEW

500 mm ?Q u a d ra n t 3 In n er

A1 A2

A5 A4 A6 A10

A7

A3

A8

A9

NEW

LQ Goals and Design Study Summary – G. Ambrosio 16LARP Collab Mtg – SLAC, Oct. 17-19, 2007

TQs Heater Delay & Detection Time

• Heater delay time: t < 10 ms close to quench plateau; t < 15 ms at I = 62% Issl

• Detection time: 3 - 11 ms during TQS01c training– Flux jumps up to 600 mV with MJR cable

TQC01

TQC01 protection heater studies by using spot heaters to initiate the quench.

mse

c

Protection heater delay + detection time

0

10

20

30

40

50

60

70

80

90

0 2000 4000 6000 8000 10000

Current (A)

Tim

e (

ms

)

200 V

300 V

400 V

TQS01c

LQ Goals and Design Study Summary – G. Ambrosio 17LARP Collab Mtg – SLAC, Oct. 17-19, 2007

MIITs Limit

• During TQC01 test, one QI vs. T measurementI: 5000 A , QI: 9.05 MIITs, Peak Temp: 340 K

• Impact on quench performance of high-MIITs quenches (TQS01c)

• + 4% after 8 MIITs• - 2.9% after 8.1 MIITs• - 7.4% after 8.7 MIITs• - 18.4 after 9.5 MIITs• Small bumps at 7.5 MIITs