SIGMAPHI SIGMAPHI RACCAM magnet design RACCAM magnet design - - PowerPoint PPT Presentation

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SIGMAPHI SIGMAPHI RACCAM magnet design RACCAM magnet design - - PowerPoint PPT Presentation

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SIGMAPHI SIGMAPHI RACCAM magnet design RACCAM magnet design Damien Neuvglise Thomas Planche Jean-Luc Lancelot PAC 07 Albuquerque June June 25 25 29, 2007 29, 2007 PAC 07 Albuquerque Summary Summary Part 1 :

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SLIDE 1

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

SIGMAPHI SIGMAPHI RACCAM magnet design RACCAM magnet design

Damien Neuvéglise Thomas Planche Jean-Luc Lancelot

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SLIDE 2

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Summary Summary

  • Part 1 : project presentation

Part 1 : project presentation

  • Part 2 : magnet design

Part 2 : magnet design

  • Part 3 : tune shift correction

Part 3 : tune shift correction

  • Part 4 : cost reduction

Part 4 : cost reduction See also posters TUPAN 07 and TUPAN 08 See also posters TUPAN 07 and TUPAN 08

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SLIDE 3

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Project presentation Project presentation

  • RACCAM is a collaboration between

RACCAM is a collaboration between – – SIGMAPHI, SIGMAPHI, Vannes Vannes (France) (France) – – IN2P3 / LPSC, Grenoble (France) IN2P3 / LPSC, Grenoble (France) – – Grenoble Hospital, Grenoble (France) Grenoble Hospital, Grenoble (France)

  • Build a spiral FFAG magnet prototype of a

Build a spiral FFAG magnet prototype of a proton medical machine 17 proton medical machine 17 – – 180 180 MeV MeV

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SLIDE 4

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Project presentation Project presentation

Spiral Scaling Proton FFAG ring E injection 17 [MeV] E extraction 180 [MeV] Injection radius 3.2 [m] Extraction radius 3.9 [m] B field at extraction 1.5 [T] Field index K ≈ 4.8 Spiral Angle ζ ≈ 49.5 [°]

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SLIDE 5

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Project presentation Project presentation

Radial field law in an FFAG is B=B0(r/r0)K

Studied by LPSC (+) variable k (+) better vertical dynamics (not proved) (-) cost (large amount of power needed)

Constant gap with distributed curents on the pole Two solutions are being studied

Studied by SIGMAPHI (+) the most economical solution (-) k is not tuneable (-) vertical dynamics becomes difficult

Gap shaping

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SLIDE 6

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Magnet design Magnet design

Fisrt Fisrt step : automated 2D calculation of gap shape step : automated 2D calculation of gap shape It converges rapidly (about ten iterations) and gives a relative field homogeneity better than 10-4 in the good field region

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SLIDE 7

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Magnet design Magnet design

Second step : automated 3D calculation Second step : automated 3D calculation → After several of these iterations (3 to 8) a 3D model with a relative field homogeneity in its center of few 10-4 is obtained

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SLIDE 8

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Magnet design Magnet design

Reaching the correct magnetic spiral Reaching the correct magnetic spiral

Effective length is measured at

different radii on both sides of the magnet centre

Spiral shape is tilted so that the

effective length corresponds to the theoretical value at every radius

  • A relative precision of 10

A relative precision of 10-

  • 3

3 on

  • n

effective length is reached after few effective length is reached after few iterations iterations

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SLIDE 9

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Tune shift correction Tune shift correction

Major problem of gap shaped magnet : vertical Major problem of gap shaped magnet : vertical tune variation with energy tune variation with energy

  • Analytical model in

Analytical model in red red

  • Calculated from 3D

Calculated from 3D maps in blue maps in blue

  • Tracking done with

Tracking done with Zgoubi Zgoubi code by J. code by J. Fourrier Fourrier

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SLIDE 10

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Tune shift correction Tune shift correction

Variable chamfer : increasing height with radius Variable chamfer : increasing height with radius

  • flattens the tune behaviour

flattens the tune behaviour Still not sufficient ! Still not sufficient !

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SLIDE 11

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Tune shift correction Tune shift correction

Pole Variable chamfer Clamps Return yoke Return yoke

Adding field clamps on previous model Adding field clamps on previous model

  • Reduce by a factor 2 vertical tune

Reduce by a factor 2 vertical tune variation variation

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SLIDE 12

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Cost reduction Cost reduction

  • Maximum

Maximum saturation imposes saturation imposes a very thick base a very thick base plate (600mm) plate (600mm)

  • Magnet

Magnet weigth weigth about 20t about 20t

  • Needed iron

Needed iron weigth weigth bloc : 50t bloc : 50t

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SLIDE 13

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Cost reduction Cost reduction

  • Enlarged the base

Enlarged the base plate to reduce plate to reduce thickness (480mm) thickness (480mm)

  • Magnet weight

Magnet weight about the same about the same

  • Iron bloc 31t

Iron bloc 31t

  • No major influence

No major influence

  • n beam dynamics
  • n beam dynamics
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SLIDE 14

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Cost reduction Cost reduction

  • Other ways to reduce magnet cost

Other ways to reduce magnet cost – – Increase k factor Increase k factor decrease orbit excursion decrease orbit excursion and so pole width and so pole width – – Increase maximum field in gap and yoke Increase maximum field in gap and yoke

  • These solutions change machine working point

These solutions change machine working point

  • needs to validate beam optics

needs to validate beam optics

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SLIDE 15

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Cost reduction Cost reduction

Estimated Estimated weight (t) weight (t) Cases Cases 12 12 K=7.6 K=7.6 Bmax Bmax and and Bmax Bmax iron 1.7T iron 1.7T 13.5 13.5 K=7.6 K=7.6 Bmax Bmax and and Bmax Bmax iron 1.5T iron 1.5T 15.7 15.7 K=4.8 K=4.8 Bmax Bmax and and Bmax Bmax iron 1.7T iron 1.7T 19.7 19.7 K=4.8 K=4.8 Bmax Bmax and and Bmax Bmax iron 1.5T iron 1.5T Examples of previous considerations Examples of previous considerations

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SLIDE 16

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Conclusion Conclusion

  • Developed efficient tools to model in 3D spiral

Developed efficient tools to model in 3D spiral magnets magnets

  • Found solutions to almost satisfy tunes

Found solutions to almost satisfy tunes constancy constancy

  • Integrated cost reduction problem and found

Integrated cost reduction problem and found efficient solutions efficient solutions

  • Need to finalize the design and build a

Need to finalize the design and build a prototype magnet prototype magnet

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SLIDE 17

PAC 07 Albuquerque PAC 07 Albuquerque June June 25 25 – – 29, 2007 29, 2007

Thank you for your attention Thank you for your attention