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High resolution mass separator for the DESIR facility at SPIRAL2

Teresa Kurtukian-Nieto CEN Bordeaux-Gradignan XVIth "Colloque GANIL" Giens, September 8 th 2009. High resolution mass separator for the DESIR facility at SPIRAL2. HRS: initial conception Design goals Ion optical calculations Prototypes: HRS C135 HRS Alpha Asymmetric

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High resolution mass separator for the DESIR facility at SPIRAL2

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  1. Teresa Kurtukian-Nieto CEN Bordeaux-Gradignan XVIth "Colloque GANIL" Giens, September 8th 2009 High resolution mass separator for the DESIR facility at SPIRAL2

  2. HRS: initial conception Design goals Ion optical calculations Prototypes: HRS C135 HRS Alpha Asymmetric HRS Alpha Symmetric Outlook Outline

  3. HRS: initial conception DESIR Resolution ~ 20000 High resolution separator with enough mass resolution to allow isobaric separation.

  4. Design goals The design of the HRS should fulfils the following requirements : High transmission (ideally 100%) and high resolution in order to provide mono isotopic beams of exotic nuclei. Compact configuration, to be able to fit in the SPIRAL2 production building. Should be robust in order to tolerate errors in alignment and component manufacturing. Reduced costs, concerning both installation and operation.

  5. Design goals • Resolving power: Ideal case:  is the total amount of aberrations In order to get a high resolving power, a large value of (x|δ) and a small value of (x|x) and Δ are desirables.

  6. Ion optical calculations • Ion-optical code COSY INFINITY • Beam emmitance: The SPIRAL2 high intensity radio frequency cooler SHIRAC will be coupled with the high resolution separator HRS. Its purpose is to cool the radioactive beams to an emittance below 3π.mm.mrad. With cooled beams the HRS should reach its design performance in mass resolution (~20000). F. Duval talk

  7. Monte Carlo Simulation: mass distributions Input beam: 50000 particles with mass deviations -1/20000, 0, +1/20000 . Final phase spaces calculated to 5th order

  8. Prototypes HRS C135 HRS Alpha

  9. HRS C135 M Q S Q Q image plane Q S -1/20000 Q +1/20000 Object plane Q • (x|δ) = -26.5 cm/% • Mirror symmetric • point-to-point both x and y Transfer matrix (x, ) (a, ) (y, ) (b, ) x -1.004793 -4.517902 0.000000 0.000000 a -0.210E-2 -1.004670 0.000000 0.000000 y 0.000000 0.000000 0.9991091 -0.459E-1 b 0.000000 0.000000 -0.3695E-1 0.991949 δm -26.50605 -59.73332 0.000000 0.000000

  10. COSY INFINITY X and Y motion Dm = = 26.5 cm/% R ~ 26500

  11. HRS Alpha Asymmetric • (x|δ) = 10 cm/% • asymmetric for M plane • symmetric for mid-plane • (x|x) ~ 0.5 Transfer matrix : (x, ) (a, ) (y, ) (b, ) x0.4794806 4.745134 0.000000 0.000000 a -0.7961E-2 2.006843 0.000000 0.000000 y 0.000000 0.000000 1.470232 3.969397 b 0.000000 0.000000 -0.966E-1 0.4193341 δm 10.14652 -0.224E-04 0.000000 0.000000 • point-to-point both x and y

  12. COSY INFINITY X and Y motion Dm = ~ 10 cm/% R ~ 20000

  13. HRS Alpha Symmetric δm = = 26.5 cm/% M = -1.0 • Same as HRSC135 • Compensation doublet • Doubly symmetric: cancel high order aberrations Transfer matrix (x, ) (a, ) (y, ) (b, ) x -1.004793 -4.517902 0.000000 0.000000 a -0.210E-2 -1.004670 0.000000 0.000000 y 0.000000 0.000000 0.9991091 -0.459E-1 b 0.000000 0.000000 -0.3695E-1 0.991949 δm -26.50605 -59.73332 0.000000 0.000000

  14. Outlook: GICOSY: D. Toprek TRANSPORT, GALOP ZGOUBI

  15. Outlook: Fringe field effects COSY Infinity: Matrix with Fringe Field (FF) effects taken into account: (x, ) (a, ) (y, ) (b, ) x -1.004793 -4.517902 0.000000 0.000000 a -0.210E-2-1.004670 0.000000 0.000000 y 0.000000 0.000000 0.999109 -0.459E-1 b 0.000000 0.000000 -0.370E-1 0.991949 δm-26.50604 -59.73332 0.000000 0.000000 Matrix FF off: x -3.126042 -9.264154 0.000000 0.000000 a -0.946891-3.126042 0.000000 0.000000 y 0.000000 0.000000 0.6700217 -11.66724 b 0.000000 0.000000 0.4723E-1 0.670021 δm-26.93832 -60.48427 0.000000 0.000000 Simulations of field maps with other codes, such as TOSCA, in order to carefully evaluate the fringe field effects and later perform a more realistic study of possible misalignment effects on the resolution.

  16. HRS working group CENBG: B. Blank, T. Kurtukian-Nieto, L. Serani GANIL: F. Varenne CSNSM Orsay: D. Lunney Institute of Nuclear Science Vinca, Belgrade : D. Toprek

  17. Backup slides

  18. Misalignment effects on mass resolution Phase spaces calculated to 5th order 50000 particles with mass deviations -1/20000, 0, +1/20000 . A shift in the multipole of 0.2 mm in the x-direction induces a deformation in the x-a phase space which is responsible for the blur in the final mass separation. In this example m/m is reduced to ~11000

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