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Design and Development of a Trochoidal Mass Separator at the Berkeley Gas-filled Separator

Design and Development of a Trochoidal Mass Separator at the Berkeley Gas-filled Separator. J.M. Gates , K.E. Gregorich , G.K. Pang, N.E. Esker and H. Nitsche Lawrence Berkeley National Laboratory 11 th International Conference on Nucleus-Nucleus Collisions May 29, 2012 San Antonio, TX.

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Design and Development of a Trochoidal Mass Separator at the Berkeley Gas-filled Separator

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  1. Design and Development of a Trochoidal Mass Separator at the Berkeley Gas-filled Separator J.M. Gates, K.E. Gregorich, G.K. Pang, N.E. Esker and H. Nitsche Lawrence Berkeley National Laboratory 11th International Conference on Nucleus-Nucleus Collisions May 29, 2012 San Antonio, TX

  2. Outline • Region of Interest • Berkeley Gas-filled Separator • Trochoidal Mass Separator

  3. 118 294118 1 ms 117 293117 14 ms 294117 78 ms 116 290116 14 ms 291116 18 ms 292116 18 ms 293116 53 ms 115 287115 32 ms 288115 88 ms 289115 0.22 s 290115 16 ms 114 285114 0.12 s 286114 0.12 s 287114 0.45 s 288114 0.80 s 289114 2.70 s 285113 5.5 s 113 278113 2 ms 282113 61 ms 283113 0.10 s 284113 0.48 s 286113 20 s 112 277112 0.7 ms 281112 97 ms 282112 0.8 ms 283112 3.83 s 284112 0.10 s 285112 33.5 s 111 272111 3 ms 274111 15 ms 278111 4 ms 279111 0.17 s 280111 3.59 s 281111 26 s 282111 0.51 s 110 269110 130 ms 270110 3 ms 271110 12 ms 273110 170 ms 277110 5.7 ms 279110 0.20 s 281110 9.6 s 109 266109 2 ms 268109 25 ms 270109 3 ms 274109 2.91 s 275109 10 ms 276109 0.72 s 278109 7.7 s 108 262108 260 ms 263108 23 ms 265108 2 ms 266108 4 ms 267108 68 ms 268108 0.37 s 269108 14 s 270108 23 s 271108 4 s 273108 0.25 s 275108 0.19 s 277108 3 ms 107 260107 32 ms 261107 12 ms 262107 0.10 s 264107 0.11 s 265107 0.94 s 266107 1 s 267107 17 s 270107 61 s 272107 9.79 s 274107 0.9 m 106 259106 0.48 s 260106 3.6 ms 261106 0.23 s 262106 21 ms 263106 0.9 s 264106 37 ms 265106 21 s 266106 0.32 s 267106 84 s 269106 130 s 271106 114 s 105 258105 4.4 s 259105 0.5 s 260105 1.5 s 261105 1.8 s 262105 34 s 263105 27 s 266105 22 m 267105 73.4 h 268105 15.9 h 270105 23 h 104 257104 4.0 s 258104 12 ms 259104 3.0 s 260104 21 ms 261104 2 s, 78 s 262104 0.19 s 263104 8 s 265104 105 s 267104 77 m 103 256103 28 s 257103 0.65 s 258103 3.9 s 259103 6.3 s 260103 180 s 261103 39 m 262103 216 m 102 255102 3.1 m 256102 2.91 s 257102 25 s 258102 1.2 ms 259102 58 m 260102 0.11 s 101 254101 10 m 255101 27 m 256101 78 m 257101 5.52 h 258101 51.5 d 259101 96 m 260101 31.8 d 100 253100 3 d 254100 3.2 h 255100 20 h 256100 158 m 257100 100 d 258100 370 ms 259100 1.5 s

  4. Berkeley Gas-filled Separator (BGS)

  5. Berkeley Gas-filled Separator (BGS) Positive: • High efficiency • Large suppression of beam and unwanted reaction products

  6. Berkeley Gas-filled Separator (BGS) Negatives: • Large focal plane image • Poor mass resolution • High gamma background at focal plane

  7. 118 294118 1 ms 117 293117 14 ms 294117 78 ms 116 290116 14 ms 291116 18 ms 292116 18 ms 293116 53 ms 115 287115 32 ms 288115 88 ms 289115 0.22 s 290115 16 ms 114 285114 0.12 s 286114 0.12 s 287114 0.45 s 288114 0.80 s 289114 2.70 s 285113 5.5 s 113 278113 2 ms 282113 61 ms 283113 0.10 s 284113 0.48 s 286113 20 s 112 277112 0.7 ms 281112 97 ms 282112 0.8 ms 283112 3.83 s 284112 0.10 s 285112 33.5 s 111 272111 3 ms 274111 15 ms 278111 4 ms 279111 0.17 s 280111 3.59 s 281111 26 s 282111 0.51 s 110 269110 130 ms 270110 3 ms 271110 12 ms 273110 170 ms 277110 5.7 ms 279110 0.20 s 281110 9.6 s 109 266109 2 ms 268109 25 ms 270109 3 ms 274109 2.91 s 275109 10 ms 276109 0.72 s 278109 7.7 s 108 262108 260 ms 263108 23 ms 265108 2 ms 266108 4 ms 267108 68 ms 268108 0.37 s 269108 14 s 270108 23 s 271108 4 s 273108 0.25 s 275108 0.19 s 277108 3 ms 107 260107 32 ms 261107 12 ms 262107 0.10 s 264107 0.11 s 265107 0.94 s 266107 1 s 267107 17 s 270107 61 s 272107 9.79 s 274107 0.9 m 106 259106 0.48 s 260106 3.6 ms 261106 0.23 s 262106 21 ms 263106 0.9 s 264106 37 ms 265106 21 s 266106 0.32 s 267106 84 s 269106 130 s 271106 114 s 105 258105 4.4 s 259105 0.5 s 260105 1.5 s 261105 1.8 s 262105 34 s 263105 27 s 266105 22 m 267105 73.4 h 268105 15.9 h 270105 23 h 104 257104 4.0 s 258104 12 ms 259104 3.0 s 260104 21 ms 261104 2 s, 78 s 262104 0.19 s 263104 8 s 265104 105 s 267104 77 m 103 256103 28 s 257103 0.65 s 258103 3.9 s 259103 6.3 s 260103 180 s 261103 39 m 262103 216 m 102 255102 3.1 m 256102 2.91 s 257102 25 s 258102 1.2 ms 259102 58 m 260102 0.11 s 101 254101 10 m 255101 27 m 256101 78 m 257101 5.52 h 258101 51.5 d 259101 96 m 260101 31.8 d 100 253100 3 d 254100 3.2 h 255100 20 h 256100 158 m 257100 100 d 258100 370 ms 259100 1.5 s

  8. Scheme What we want to do: • Collect recoils at focal plane of BGS • Separate by mass • Transport low-background region

  9. Space Available 6 ft BGS Support Beams Concrete Walls Cave 2 Beamline

  10. Scheme What we want to do: • Collect recoils at focal plane of BGS • Separate by mass • Transport low-background region Berk. Built ANL Built Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  11. Window > 2 μm metal foil with support grid Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  12. Gas Catcher SHE ion retains +1 or +2 charge Cylindrical and conical section Pitch > 0.5 mm, f ~ 1 MHz SHE ions swept out by gas flow He ~ 100 mbar RF + DC Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  13. RFQ Trap Match acceptance for mass analyzer Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  14. Mass Analyzer: Requirements • Fit at least 6 masses on C3 • Ability to determine implantation time • High dispersion • M/DM of >500 • High efficiency • Low extraction voltage from RFQ • Fit within existing space Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  15. Mass Analyzer: The Idea Typical mass separators • Wien filter • TOF • 90-180° Magnet TrochoidSeparator - FIONA Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  16. Mass Analyzer: The Idea Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  17. Mass Analyzer: The Idea Ratio of Ewien/Etroc Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  18. FIONA: Simulations A = 300-304 Vacc = 4 kV Q = 2+ Einzel Lens A= 300 301 302 303 304 Electrode: 50 x 20 cm, 500 V/cm +V -V Magnet 1.5 T x Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  19. What it looks like on the FPD A= 300 301 302 303 304 Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  20. FIONA: Simulations A = 300-305 Vacc = 4000 kV Q = 2+ Einzel Lens A= 300 301 302 303 304 Electrode: 50 x 20 cm, 500 V/cm +V -V Magnet 1.5 T x Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  21. How to get time information A= 300 301 302 303 304 Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  22. Facility Layout 6 ft BGS Support Beams Concrete Walls Cave 2 Beamline

  23. Mass Analyzer: Requirements • Fit at least 6 masses on C3 • Ability to determine implantation time • High dispersion • M/DM of >500 • High efficiency • Low extraction voltage from RFQ • Fit within existing space Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  24. Status and Future • Currently building little-FIONA • 0.55 T magnet • Xe ion source • MCP detector

  25. FIONA: Simulations Magnet 0.5 T x +V Einzel Lens A= 130 131 132 133 134 -V A = 130-134 Vacc= 1 kV Q = 1+ Electrode: 50 x 20 cm, 125 V/cm Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  26. What it looks like on the FPD Window BGS Gas Catcher RFQ Trap 1 RFQ Trap 2 Extr. Accel. Mass Anal. Det. Box

  27. Status and Future • Currently building little-FIONA • Xe ion source • 0.55 T magnet • MCP detector • All parts have been ordered/designed • Testing and construction will begin in June

  28. Thank For Your Attention

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