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Fragment Mass Analyzer

Fragment Mass Analyzer. Darek Seweryniak, ANL. C. N. Davids et al. , Nucl. Instrum. Meth., B 70 , 358 (1992). GAMMASPHERE+FMA. Resonances in rp-process nuclei n-rich nuclei A~60 N~Z nuclei 101 Sn Proton emitters a emitters Transfermium nuclei …. GRETINA+FMA.

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Fragment Mass Analyzer

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  1. Fragment Mass Analyzer Darek Seweryniak, ANL C. N. Davids et al., Nucl. Instrum. Meth., B 70, 358 (1992).

  2. GAMMASPHERE+FMA • Resonances in rp-process nuclei • n-rich nuclei A~60 • N~Z nuclei • 101Sn • Proton emitters • a emitters • Transfermium nuclei • … GRETINA at ATLAS workshop, March 2013

  3. GRETINA+FMA • Can we extend the GS-FMA reach? • Larger FMA solid angle • Higher Ge rates? • Better Doppler correction • (recoil angle and energy) • Polarization • No dead time • Campaign in January 2013 • Important step towards GRETA GRETINA at ATLAS workshop, March 2013

  4. Argonne Fragment Mass Analyzer Mass resolution: dM/M~1/350 Angular acceptance: DW=8 msr(2 msr) Energy acceptance: DE/E=+/-20% M/Q acceptance: D(M/Q)/(M/Q)=10% Flight path 8.2m Max(Br)=1.1Tm Max(Er)=20MV Can be rotated off 0 degrees Can be moved along the axis Different focusing modes Q1 Q2 ED1 MD M1 40 cm ED2 M2 Q3 Q4 M3 DSSD FP GRETINA at ATLAS workshop, March 2013

  5. FMA at 293 mm and 900 mm Qy,max=0.0401 rad Qy,max=0.0295 rad Qx,max=0.0495 rad Qx,max=0.0167 rad W=7.4 msr W~1.8 msr GRETINA at ATLAS workshop, March 2013

  6. FMA angular acceptance 58Ni+50Cr at 220 MeV Fraction of accepted recoil 2 msr 8 msr gain alpha+p+2n 0.13 0.47 X3.6 p+2n 0.44 0.93 X2.1 Based on PACE calculations. GRETINA at ATLAS workshop, March 2013

  7. Existing focal plane detectors • Parallel Grid Avalanche counter • Very good spatial resolution • Modest rate capability <10 kHz • Fairly thin windows (2X120 micron mylar foils) • Parallel Foil Avalanche counter • Very good spatial resolution • High rate capability (tested to 30 kHz) • More material (two additional foils) • Channel plate detector • Worse spatial resolution • High rate capability (100 kHz) • Very thin • Ionization chamber • Isobutane • 200 micron window • 3 segments - 5cm+5cm+20cm • Pressure <25 Torr GRETINA at ATLAS workshop, March 2013

  8. Micro-channel plate detector • 4X12 cm2 whole focal plane • high rates 100 kHz • good spatial resolution (magnets) • much lower energy loss • better Z resolution • less angular straggling B. diGiovine Photonis Inc., USA GRETINA at ATLAS workshop, March 2013

  9. Ge clovers 160X160 DSSD Large area Si Si/PiN box plastic b dets Implantation station Recoil-Decay Tagging (protons,alphas,betas,conversion electros, gamma rays, …) GRETINA at ATLAS workshop, March 2013

  10. Implantation station • Suite of DSSDs • 48X48, 16X16mm2 • 40X40, 40X40mm2 • 80X80, 32X32mm2 • 160X160, 64X64mm2, • 100 mm - protons • 140 mm - alphas • 300 mm - beta delayed protons • 1000 mm - betas • Large area Si veto detector: 5X5cm • Escape detectors • 4 SSSD in a box geometry, 7 strips, 4X6cm2 • PiN diode detector array, 4 2X2 detectors GRETINA at ATLAS workshop, March 2013

  11. X-array • 5 clover detectors in a box geometry • 64x64 mm, 160x160 DSSD • Mobile frame GRETINA at ATLAS workshop, March 2013 11

  12. FMA Digital DAQbased on GRETINA, developed in parallel with DGS • Trigerless • DSSD (320 chans) • X-array (20 chans) • focal plane (20 chans) • Resolution comparable to analog (Ge/Si) • Pulse shape analysis • 100 kHz/DSSD possible 100MHz, 14-bit Digitizer M. Cromaz et al., A 597 (2008) 233–237 DDAQ was used in 4 experiments (two with DGS) Trigger and Time control module J.T. Anderson et al., 2007, IEEE Nuclear Science Symposium Conference Record, p. 1751 GRETINA at ATLAS workshop, March 2013

  13. Possible GRETINA-FMA configurations 60 cm New frame 30 cm like BGS 30 cm New idea 30-60-90 cm GRETINA at ATLAS workshop, March 2013

  14. Thank you for your attention! GRETINA at ATLAS workshop, March 2013

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