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Facility circa 2007

This project discusses the upgrade of the TAMU MDM Focal Plane Detector with MicroMegas Technology at the Cyclotron Institute, Texas A&M University. The upgrade involved replacing the existing gridded ionization chamber, proportional counters, and plastic scintillator with advanced components to enhance beam testing capabilities. The upgraded detector was tested with beams of various ions and targets, demonstrating improved performance in beam resolution and detection efficiency. The successful upgrade opens the door for further testing with heavier beams, higher energies, and different gases. Acknowledgments are given to the researchers involved in this project for their contributions.

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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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