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Facility circa 2007

Upgrade of the TAMU MDM-Focal Plane Detector with MicroMegas Technology Alexandra Spiridon 10 March 2015 Cyclotron Institute Texas A&M University. Facility circa 2007. Used for secondary beams. TAMU Multipole-Dipole-Multipole (MDM). T-REX [TAMU Reaccelerated Exotics]. T-REX.

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Facility circa 2007

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  1. Upgrade of the TAMU MDM-Focal Plane Detector with MicroMegas TechnologyAlexandra Spiridon10 March 2015Cyclotron InstituteTexas A&M University

  2. Facility circa 2007 Used for secondary beams

  3. TAMU Multipole-Dipole-Multipole (MDM)

  4. T-REX [TAMU Reaccelerated Exotics]

  5. T-REX Projected Beam Intensities from LIG after K500 Assuming 14 mA beam, realistic LIG, CBECR, transport and K500 extraction efficiencies

  6. The "Oxford" - One of the 2 focal plane detectors Before upgrade: - Gridded ionization chamber (VK ~ -800V) - 4 Proportional counters (VW ~ +900-1000V, Vs=-100V) - Plastic scintillator with PMTs for signal readout

  7. ?

  8. Oxford detector - Upgrade

  9. Oxford detector - Upgrade

  10. Oxford detector - Upgrade

  11. Oxford Upgrade - Source test α-source Note: Source is about 40 mm from Row 4 and each row is 32.5 mm thick with ~0.5 mm in between rows

  12. 5.14 MeV α ~1702keV ~1934keV 5.49 MeV α ~1510keV ~2500keV 5.8 MeV α ~1380keV ~3080keV

  13. μ=1854 fwhm=224 resoln=12% μ=1166 fwhm=264 resoln=22.6% μ=2293 fwhm=125 resoln=5.45%

  14. Oxford Upgrade - Beam testing • Beams:16O at 12 MeV/n -> 192 MeV total 22Ne at 12 MeV/n -> 264 MeV total 28Si at 12 MeV/n -> 336 MeV total • Targets: 197Au (200μg/cm2), 13C (100μg/cm2) • MDM @ 5->12 degrees. • Oxford Gas: Isobutane @ 30->100 Torr • Trigger was given by the coincidence of the PM signals

  15. Example • Beam: 22Ne @ 12 MeV/n • Target: 197Au • MDM @ 5 deg • VK = -800 V • Amp Gain = 2 x 4 = 8 • Isobutane p=100 Torr

  16. VMuO = +300V - Narrow collimated beam

  17. VMuO = +300V - Beam sweep

  18. Beam Sweep - Pad resolutions

  19. Variation of the MuO resolution with bias and pressure

  20. Comparison between dE-PM and MuO-PM 22Ne at 5 deg and 100 Torr

  21. Comparison between dE-PM and MuO-PM 22Ne at 5 deg and 30 Torr

  22. Comparison between dE-PM and MuO-PM 22Ne at 9 deg and 30 Torr

  23. Comparison between dE-PM and MuO-PM 28Si at 4 deg and 30 Torr

  24. Comparison between dE-PM and MuO-PM 28Si at 7 deg and 30 Torr

  25. Conclusion • Success :) • Further testing: • heavier beams • higher energy beams • different gas

  26. Many thanks to: • R. E. Tribble, B. Roeder, A. Saastamoinen, M. Dag, G. Tabacaru, H. Clark, Y.-W. Lui, J. Button (Cyclotron Institute, Texas A&M) • G. Pascovici (IKP Köln) • E. Pollacco (CEA Saclay) • L. Trache (NIPNE)

  27. Thank you for your attention!

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