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Some thoughts about resistive D1 Phase I upgrade options. LIUWG 29/11/07 M. Karppinen AT/MEL. Acknowledgements: S. Fartoukh, F. Bordry, J. Inigo-Golfin, R. Ostojic, S.Roesler, T. Zickler, J-P. Koutchouk, D.Tommasini,…. Outline. Performance goals and options Present D1

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Some thoughts about resistive d1 phase i upgrade options

Some thoughts about resistive D1 Phase I upgrade options

LIUWG 29/11/07

M. Karppinen AT/MEL

Acknowledgements:

S. Fartoukh, F. Bordry, J. Inigo-Golfin, R. Ostojic, S.Roesler, T. Zickler, J-P. Koutchouk, D.Tommasini,…


Outline
Outline

  • Performance goals and options

  • Present D1

  • Upgrade based on recycling (parts of) existing magnets

  • Time estimate

  • Radiation aspects

  • Possible 2nd gen. MBXW

  • Scaling Performance & Cost

  • Summary

M. Karppinen AT/MEL


Performance goals and options
Performance goals and options

  • Based on Triplet aperture of 130 mm

    => Longer Triplet, higher , shorter D1/D2 distance, stronger D1, larger gap

  • Integrated Strength of D1:

    • +1 Tm => +15-20 mm Triplet aperture

    • 24 Tm, if D2-Q4 moved by 16 m away from IP (good for matching the optics to the arcs)

    • 26.1 Tm, nominal LHC

    • 29 Tm, if D2 not moved

M. Karppinen AT/MEL


Performance goals
Performance goals…

  • Gap height:

    • Assuming constant clearance for beam pipe (currently 2 mm)

    • 105 mm (a priori ≥110), IR5 with Hor X-ing

    • 115 mm (a priori ≥120), IR1 with Ver X-ing

  • Good Field Region:

    • dx = 15 mm

    • Rr=35 mm

    • dB/B1 < 3 units

4

M. Karppinen AT/MEL

LIUWG 29/11/07


Mbxw of d1 in ir1 ir5
MBXW of D1 in IR1 / IR5

Nominal strength 1.28 T

Nominal current 750 A

Ultimate current 835 A

Magnetic length 3.4 m

Gap height 63 mm

GFR +/- 41 mm

Overall length 3.8 m

Yoke length 3.4 m

Overall weight 11500 kg

Water flow 19 l/min

Power dissipation 34 kW

M. Karppinen AT/MEL


Scaling the present design
Scaling the present design

700+ kCHF for new PCs and spares

600 kCHF for new PCs and spares

300 kCHF for new transformers and spares

M. Karppinen AT/MEL


Scaling the present design1
Scaling the present design..

2 x 200 kCHF for new cooling station

(5 < dp <25 bar

M. Karppinen AT/MEL


Upgrade of existing mbxw plan a
Upgrade of existing MBXW Plan A

Add 57 mm thick magnetic spacers between half-cores

1400 A, 1.41 T (29 Tm)

M. Karppinen AT/MEL


Upgrade of existing mbxw plan b
Upgrade of existing MBXW Plan B

Buy new half-cores

Re-cycle coils

1400 A, 1.41 T (29 Tm)

M. Karppinen AT/MEL





Radiation aspects
Radiation aspects

Azimuthally averaged residual dose rate (mSv/hr) on the IP5 inner triplet components after 30-day irradiation and 1-day cooling

=> ~10 mSv/hr

Ref: Mokhov et al, LHC PR-633, 2003

M. Karppinen AT/MEL


Radiation
Radiation..

After several months of cooling

=> ~2-3 mSv/hr

Residual dose rate (mSv/hr) on the IP5 inner triplet vacuum vessel after 30-day irradiation and 1-day cooling and residual dose averaged over the IP1/IP5 quadrupole SC coils (all quads, all layers) vs irradiation and cooling times (bottom)

Ref: Mokhov et al, LHC PR-633, 2003

M. Karppinen AT/MEL


*) 24 + 4 spares

M. Karppinen AT/MEL


Possible 2 nd generation mbxw
Possible 2nd Generation MBXW

*) 24 + 4 spares

M. Karppinen AT/MEL


Scaling performance cost
Scaling Performance & Cost

  • New design

  • Optimized magnet X-section

  • 24 + 4 spares = 28 magnets

  • 29 Tm / D1

  • GFR = +/- 50 mm, dB/B1 < 3 units

  • Inom = 850 A

  • dp = 4 bars

  • Does not include:

    water hoses, electrical cables, water cooled bus bars, internal transport, acceptance tests and magnetic measurements at CERN, installation, commissioning, vacuum chambers, electrical and water supply to the tunnel, interlock system, manpower for survey, equipment for magnetic measurements at CERN and transport vehicles, investment cost for the power converters…

M. Karppinen AT/MEL


+10 mm => 810 kCHF

+1Tm => 317 kCHF

M. Karppinen AT/MEL


+10 mm => 350 kCHF

+10 units => 520 kCHF

M. Karppinen AT/MEL


Summary
Summary

  • Re-working the existing MBXW magnets:

    • Residual dose 2-3 mSv/hr (probably pessimistic)

    • Machine downtime 8-12 months

    • Very high operation cost

    • Requires powering and cooling upgrade

  • New resistive magnets:

    • Magnet cost around 7 MCHF with the present parameter space

    • Operation cost significantly lower

    • Existing powering & cooling

    • Big saving potential by careful optimization of the performance spec

    • Lead-time: 1 year for design spec, tendering etc.+ 1 year first delivery + 1 year last delivery

    • To have the magnets ready in 2012 the work shall commence as latest by 2009

M. Karppinen AT/MEL


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