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Heat deposition in superconducting magnets for a beta decay storage ring

E.Wildner F. Cerutti F. Jones, Triumf (ACCSIM) FLUKA user meeting, 11/09/07. Heat deposition in superconducting magnets for a beta decay storage ring. Overview. The beta beam complex Losses and loss management in decay ring The arc-layout, the magnets

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Heat deposition in superconducting magnets for a beta decay storage ring

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  1. E.Wildner F. Cerutti F. Jones, Triumf (ACCSIM) FLUKA user meeting, 11/09/07 Heat deposition in superconducting magnets for a beta decay storage ring

  2. Overview • The beta beam complex • Losses and loss management in decay ring • The arc-layout, the magnets • Choice of representative model • The beam code ACCSIM, developments • Interfacing ACCSIM and FLUKA • Results and Future Work Constraint explaining some of the choices and shortcuts: 2 months to develop beam code for the application, interface (beam-code FLUKA) and FLUKA modeling and runs Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  3. EURISOL Scenario EURISOL scenario Aim: production of (anti-)neutrino beams from the beta decay of radio-active ions circulating in a storage ring • Similar concept to the neutrino factory, but parent particle is a beta-active isotope instead of a muon. • Accelerate parent ion to relativistic gmax • Boosted neutrino energy spectrum: En2gQ • Forward focusing of neutrinos: 1/g EURISOL scenario • Ion choice: 6He and 18Ne • Based on existing technology and machines • Study of a beta-beam implementation at CERN • Once we have thoroughly studied the EURISOL scenario, we can “easily” extrapolate to other cases. EURISOL study could serve as a reference. Ions move almost at the speed of light Neutrino detector Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner 3

  4. Possible Beta Beam Complex High-energy part Low-energy part Neutrino source Acceleration Ion production Beam to experiment Proton DriverSPL Acceleration to final energy PS & SPS Ion productionISOL target & Ion source Decay ring Br = 1500 Tm B = ~6 T C = ~6900 m Lss= ~2500 m 6He: g = 100 18Ne: g = 100 SPS Neutrino Source Decay Ring Existing!!! Beam preparationECR pulsed Ion accelerationLinac, 0.4 GeV 93 GeV PS . Acceleration to medium energy RCS, 1.5 GeV 8.7 GeV Detector in the Frejus tunnel Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner 4

  5. Particle Turnover Momentum collimation merging p-collimation injection decay losses Arc Straight section Arc Straight section ~1 MJ beam energy/cycle injected  equivalent ion number to be removed ~25 W/m average Momentum collimation: ~5*10126He ions to be collimated per cycle Decay: ~5*10126Li ions to be removed per cycle per meter Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  6. The Decay Ring Optics primary collimator Optical functions (m) A. Chance et al., CEA Saclay Decay ring: • C~7km • LSS~2.5 km s (m) One straight section used for momentum collimation. Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  7. Particle removal & loss Arcs Decay products Straight section Merging increases longitudinal beam size Momentum collimation Decay products Primarily accumulated and extracted at end with first dipole to external dump. Not treated yet: Betatron-Collimation Emergency cases (failure modes) Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  8. Large Aperture Requirements Dipole 6Li 3+ Absorber 18F 9+ Beam Pipe 8 cm radius needed for the horizontal plane where the decay products cause daughter beams + 1 cm for the sagitta (no curved magnet) 4 cm for the vertical plane Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  9. The Large Aperture Dipole, first feasibility study high tip field, non-critical Courtesy Christine Vollinger 6 T LHC ”costheta” design Good-field requirements only apply to about half the horizontal aperture. Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  10. The Decay Products in the arcs Dipole Courtesy: A. Chancé Deposited Power (W/m) s (m) Arc, repetitive pattern Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  11. Heat Deposition Calculations Need to interface beam code and code for tracking particles in matter Choice: Beam Code: ACCIM (Developed at TRIUMF, many options developed specifically for the decay simulations, responsible Frederick Jones, TRIUMF) Particle Tracking in Matter: FLUKA "FLUKA: a multi-particle transport code",A. Fasso`, A. Ferrari, J. Ranft, and P.R. Sala,CERN-2005-10 (2005), INFN/TC_05/11, SLAC-R-773 "The physics models of FLUKA: status and recent developments",A. Fasso`, A. Ferrari, S. Roesler, P.R. Sala, G. Battistoni, F. Cerutti, E. Gadioli, M.V. Garzelli, F. Ballarini, A. Ottolenghi, A. Empl and J. Ranft,Computing in High Energy and Nuclear Physics 2003 Conference (CHEP2003), La Jolla, CA, USA, March 24-28, 2003 Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner 11

  12. Heat Deposition Geometry Model, one cell Q Absorbers B B No Beampipe Concentric cylinders, copper (coil), iron (yoke) Q (ISR model) B (new design) B ”Overlapping” Quad to check repeatability of pattern Q Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  13. “Classic” Model/Lattice Model ”Classic” model SimpleGeo Reference calculation A lattice model Scoring in coils Using common variables from ROT-DEFI in the magnetic field description Check of geometry description Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  14. Lattice Model, ROT-DEFI Offset = InverseMatrix * NewCoordinates - OldCoordinates Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  15. Magnetic Field, ROT-DEFI Project field component in x direction on FLUKA (x and z) axes Magnetic field routine: In Fortran Common, knowing region number: offset and angle for each magnet length of elementINCLUDE(“RTDFCM”) Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  16. The beam code ACCSIM • Accsim, developed at TRIUMF, is a multiparticle tracking and simulation code for synchrotrons and storage rings. • Some applications: CERN (S)PS(B), KEK PS, J-PARC, SNS, ... • Incorporates simulation tools for injection, orbit manipulations, rf programs, foil, target & collimator interactions, longitudinal and transverse space charge, loss detection and accounting. • Interest for Betabeam: to provide a comprehensive model of decay ring operation including injection (orbit bumps, septum, rf bunch merging), space charge effects, and losses (100% !) • Needed developments for Betabeam: • Arbitrary ion species, decay, secondary ions. • More powerful and flexible aperture definitions (for absorbers) • Tracking of secondary ions off-momentum by >30% (unheard of in conventional fast-tracking codes) • Detection of ion losses: exactly where did the ion hit the wall? • -- a challenge for tracking with the usual ”element transfer maps” Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  17. Interface Beam Code <->FLUKA Create model in ”Beam Optics” beam code!!! Geometry generation Particle data conversion Future Today Interface package Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  18. Model generation from beam survey code * ”Beam Optics : a program for analytical beam optics” Autin, Bruno; Carli, Christian; D'Amico, Tommaso Eric; Gröbner, Oswald; Martini, Michel; Wildner, Elena; CERN-98-06 Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner 18

  19. Accsim and Fluka • Accsim as event generator for FLUKA • Identify “region of interest”: sequence of Accsim elements corresponding to the representative arc cell modeled in FLUKA. • Tracking particles representing statistically fully populated ring (9.66×1013He or 7.42×1013Ne), with decay. • Detect and record two types of events: • Ions that decayed upstream of the cell and have survived to enter the cell. • Ions that decay in the cell. • For each event the ion coordinates and reference data are recorded for use as source particles in FLUKA. Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  20. Particle generation and treatment 1. ACCSIM tracks 6Li and 18F particle decaying in the ring up to cell entry 2. ACCSIM gives coordinates and momentum vectors of particles just decayed in cell 3. Particles escaping the vacuum pipe are treated by Fluka 4. We assume particle has same momentum as parent End of cell Decayed in cell Escaping Decayed in machine with absorbers inserted in ACCSIM Start of cell Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  21. INCLUDE '(SCOHLP)'* to load particle properties INCLUDE '(PAPROP)'* common/scorun/iunit common/hiexit/nhi(100,300),izmax,iamax data nhi/30000*0/,izmax/0/,iamax/0/ if(iscrng.eq.1.and.JSCRNG.eq.1) thenc assuming 38=VACUUM and 28=LASTQUAD if(nreg.eq.38.and.iolreg.eq.28) thenc we select HEAVY ION if(ij.eq.-2) then nhi(ichrge(ij),ibarch(ij))=nhi(ichrge(ij),ibarch(ij))+1 if(ichrge(ij).gt.izmax) izmax=ichrge(ij) if(ibarch(ij).gt.iamax) iamax=ibarch(ij)c momentum scoring ourpla=pla if(pla.lt.zerzer) then ourpla = -pla ourpla = SQRT ( ourpla * ( ourpla + TWOTWO * AM (-2) ) ) endif write(iunit,'(i3,i4,7(1pe18.8))') ichrge(ij),ibarch(ij), * ourpla,Xx,Yy,Zz,Txx,tyy,tzz endif endif endifc FLUSCW = ONEONE LSCZER = .FALSE. RETURN END Scoring particles coming out of cell with fluscw FLUKA card USERWEIG Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner 21

  22. Coordinate transformation ACCSIM/FLUKA and inverse We used Mathematica based on the survey options of ”BeamOptics” * to generate FLUKA Particle file Useful if ACCSIM could integrate the transformation code y ACCSIM x y FLUKA [cm] x Transverse projection [cm] * ”Beam Optics : a program for analytical beam optics” Autin, Bruno; Carli, Christian; D'Amico, Tommaso Eric; Gröbner, Oswald; Martini, Michel; Wildner, Elena; CERN-98-06 Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  23. Overall Power Deposition l Normalized to a decay rate in cell: He: 5.37 109 decays/s Ne: 1.99 109 decays/s 6Li 18F Compare to technical limits (10W/m): not exceeding for either ion Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  24. Overall Power Deposition ll Normalized to a decay rate in cell: He: 5.37 109 decays/s Ne: 1.99 109 decays/s • Compare to technical limits (10W/m) • not exceeding for either ion Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner 24

  25. Local Power Deposition Local power deposition concentrated around the mid plane. Limit for quench 4.3mW/cm3 (LHC cable data including margin) • Situation fine for 6Li • 18F: 12 mW/cm3 Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  26. Is model representative? 22 % leaving! 15 % entering! ACCIM model = FLUKA model? End of cell Decayed in cell Escaping Decayed in machine with absorbers inserted in ACCSIM Start of cell Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner 26

  27. Alternative solutions Open Mid Plane Magnet a better solution? Profit of work ongoing at CERN Use this model in simulations Introduce a “Beam Screen” Courtesy Erk Jensen, CERN Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

  28. Conclusion and Future A protocol between the beam code Accsim and the material tracking code (FLUKA) has ben developed for the beta beam studies. ACCSIM to be used for the whole accelerator chain, for decay data production. Accsim now to be complemented with the packages made for model creation and for coordinate transformation (Accsim->FLUKA->Accsim) First results (good for a preliminary decision taking on magnet) indicate that the deposited power is exceeding the limits locally, but not globally. Optimisation or another magnet design needed. Model to be verified for repeatability The structure with absorbers would need special arrangements for the impedance induced. A thick liner inside the dipole could be an alternative Alternative dipole design with VERY large aperture or open mid-plane (new development, ongoing). Apply simulation tools for momentum collimation. Beta Beam - Loss Deposition, FLUKA meeting, E.Wildner

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