large magnetic volumes for neutrino factory detectors
Download
Skip this Video
Download Presentation
Large Magnetic Volumes for Neutrino Factory Detectors

Loading in 2 Seconds...

play fullscreen
1 / 11

Large Magnetic Volumes for Neutrino Factory Detectors - PowerPoint PPT Presentation


  • 78 Views
  • Uploaded on

Large Magnetic Volumes for Neutrino Factory Detectors. Bross ISS Detector Phone Meeting July 3, 2006. Options. We have begun looking into the engineering realities of trying to magnetize very large (>30k m 3 ) volumes

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Large Magnetic Volumes for Neutrino Factory Detectors' - apollo


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
large magnetic volumes for neutrino factory detectors

Large Magnetic Volumes for Neutrino Factory Detectors

Bross

ISS Detector Phone Meeting

July 3, 2006

options
Options
  • We have begun looking into the engineering realities of trying to magnetize very large (>30k m3) volumes
  • What we are considering is something much much larger than what has been built to date
    • But has been studied it some detail – See GEM Solenoid
  • Technologies
    • Room temperature Cu or Al conductor - NO
      • Power dissipation is MUCH too high
    • High Tc superconductor – NO*
      • At this point in time for the same Ampere-Turns: 200X more expensive than convention SC
      • *However, development progress in recent years has been rapid so the situation could change in the near (5 yr) future.
    • Conventional SC
      • Lots of experience, but this size is new.
      • Technically – certainly doable
      • BUT WHAT IS THE COST?
multiple solenoids conceptual layouts
Multiple Solenoids - Conceptual Layouts

Magnetic Tunnel

n

15 m x 15 m x 15m modules; B = 0.5T

Magnetic Cavern

Magnet

Steel

n

cost modeling
Cost Modeling
  • Green and Lorant is a good starting point
    • “Estimating the Cost of Large Superconducting Thin Solenoid Magnets” – 1993
    • C(M$) = 0.5(Es(MJ))0.662

C(M$) = 0.4(B(T)V)0.635

  • We can also take the CMS Coil as-built cost (»$55M) as a more recent reference point
    • B = 4T
    • V = 340 m3
    • Stored Energy – 2.7 GJ
  • For the NF case take a 15 X 15 X 15 m3 volume with B=0.5T
    • Don’t worry now about whether this is a cylindrical solenoid or a box.
      • This will of course be very important mechanically
cost extrapolations for baseline nf detector magnet
Cost Extrapolations for Baseline NF Detector Magnet
  • Cost via stored energy
    • Stored energy »340 MJ
    • From Green and Lorant
      • C(M$) » 0.5(340)0.662» 24M$
  • Cost via Magnetic Volume
    • From Green and Lorant
      • C(M$) » 0.4(.5 X 3400)0.635» 45M$
  • Reference Point – CMS Solenoid
    • C(M$) » 0.5(2700)0.662» 93M$ (Stored energy)
    • C(M$) » 0.4(4 X 370)0.635» 41M$ (Magnetic volume)
  • Most Optimistic Extrapolation
    • Use stored energy and conclude formula overestimates by factor of 1.7 (93/54) based on CMS case
      • Then NF magnet extrapolated cost – 14M$
  • Most Pessimistic Extrapolation
    • Use magnetic volume and conclude formula underestimates by a factor of 1.3 (54/41) based on CMS case
      • Then NF magnet extrapolated cost – 60M$
magnet costs
Magnet Costs
  • Another extrapolation model has been used by V.Balbekov, E.Black, C. Darve, D. Elvira, J.M.Rey (MuCool Note 215) based on scaling laws developed by A. Herve.
    • P0 = 0.33 S0.8 Price of equiv. zero energy magnet in MCHF
    • PE = 0.17E0.7 Price of magnetization in MCHF
    • P = P0 + PE Price of magnet in MCHF
    • Where
      • S = Surface area of the cryostat
      • V = Magnetized volume
      • E = Stored energy
      • NOTE: Model includes cost of power supplies, cryogenics and vacuum plant
    • This model does take into account difficulties in dealing with size separately from magnetic field issues
  • Balbekov et. al. used three “as-builts” to derive the coefficients (0.33, 0.8, 0.17, and 0.7) in the above equations
    • ALEPH (R=2.65m, L=7m, B=1.5T, E=138MJ, P=14M$)
    • CMS (R=3.2m, L=14.5m, B=4T, E=3.0GJ, P*=53M$)
    • GEM (R=9m, L=27m, B=0.8T, E=1.8GJ, P*=98M$)

*estimated cost at the time

world s largest magnet never built
World’s Largest Magnet Never Built
  • The GEM Solenoid was to be the largest SC magnet ever built at 19 m in diameter and 30 m long (final engineering spec)
gem solenoid
GEM Solenoid

Coil module » 1.2m long

12 Coil modules stacked to

produce half coil

magnet cost estimate ii
Magnet Cost Estimate II
  • The GEM magnet is certainly relevant to the coils we are considering and as such is an good reference point for the cost estimate even though it was never built.
  • Using this estimating model we have for one of our coils
    • P0 = .33(900)0.8 = 76 MCHF
    • PE = .17(340)0.7 = 10 MCHF
    • P= 86 MCHF » 69M$
  • What we see is that the cost is driven by the size (= vacuum can) and is at the high-end+ of the Green-Lorant estimating model
conclusions
Conclusions
  • Conclusions:
    • For low-field case (B<.5T) scaling formulae may not be accurate due to the large size of magnets being considered
      • Vacuum loading (vacuum vessel) will be a major consideration and will strongly impact cost
      • Superconductor itself is not a cost driver
        • Based on recent MICE order, cost for baseline NF magnet discussed here is <0.5M$
      • Magnetization Costs are not driving factor in low-field case
      • On-site fabrication required
    • Magnets of this size can certainly be built, but better cost estimates will only come after some real engineering analysis
      • 3-6 month effort
    • Savings will come with “INNOVATION” in vacuum vessel
        • We have started looking at the vacuum vessel here at Fermilab
    • The dimensions and a potentially non-circular geometry will be the cost drivers and will present the engineering challenges
conclusions ii
Conclusions II
  • At this time it appears that a large volume air-core magnetized Totally sampling detector for a neutrino factory is not feasible from cost considerations, but is certainly technically feasible
  • R&D aimed at the mechanical engineering issues is required to see if the costs can be reduced.
  • Developments in high Tc SC could change this picture
    • Reduction in cost of the high Tc conductor itself
    • Possibility for non-vacuum insulated vessels (Icarus example) for SC operating at 77K
    • There is a long way to go to make this viable
ad