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Energy resolution results for Microbulk MICROMEGAS at high energy and pressure.

Energy resolution results for Microbulk MICROMEGAS at high energy and pressure. Alfredo Tomás Alquézar Universidad de Zaragoza on behalf of the collaboration College de France : P. Gordetzsky and P. Salin IRFU-Saclay : E. Ferrer-Ribas and I. Giommataris

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Energy resolution results for Microbulk MICROMEGAS at high energy and pressure.

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  1. Energy resolution results for Microbulk MICROMEGAS at high energy and pressure. Alfredo Tomás Alquézar Universidad de Zaragoza on behalf of the collaboration College de France: P. Gordetzsky and P. Salin IRFU-Saclay: E. Ferrer-Ribas and I. Giommataris Zaragoza: T. Dafni, F.J. Iguaz, I. G. Irastorza and A. Tomás

  2. Outline • The subject: Microbulk µicroMegas • The motivation:A NEutrino Xenon gas TPC for  decay searches • The tests:high energy & pressure resolution • Ar + isoC4H10 (already presented, Amsterdam I.G. Irastorza) • pure Xe (preliminary) • Results (preliminary) RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  3. Micromesh 5µm copper Kapton 50 µm Readout pads Microbulks (not to mistake for bulks) Readout plane + pillars + mesh manufactured simultaneously. Uniformity of amplification gap up to few microns . Next generation of MM for CAST (3 microbulks + CCD) RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  4. 100µm 40 µm kapton pillards cooper mesh cooper anode epoxy support anode contact mesh contact Mibrobulk simplest prototype 55Fe 12,3% FWHM 25 mm RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  5. 0nbb& NEXT • Neutrinoless Double Beta (0nbb) • Neutrino: Majorana or Dirac? • Absolute scale of netrino’s mass • NEXT • Monolithic Xe detector • Topological signature: RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  6. NEXT: energy resolution requirement Energy is the main observable for a  decay experiment. Good resolution is essential to distinguish the ultimum and unavoidable background: the bb2n spectrum. RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  7. oxisorb P exhaust The tests: set up Lower part • Simple anode microbulk • HP 2 liter TPC (from HELLAZ) • Single run: full TPC (through oxisorb) and isolate gas Upper part RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  8. The tests:Ar + 2% isobutane • Already presented (I.G. Irastorza, Amsterdam RD51 meeting). • 1,5-2% FWHM along the 2-5 bar pressure range. • Landau deconvolution points out 0,7% FWHM intrinsicicroMegas resolution. • Very similar results obtained in a wide range of parameters like: electric drift field, gain, electric fields ratio, electric drift field homogeneity, etc. 4,75 bar RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  9. The tests:pure Xe (PRELIMINARY) • Enough gain was achieved only with Xe. • Resolution and gain were not so robust as in Ar, moreover some peak’s defects indicated the presence of attachment . • Pulse shape offline analysis can help to clarify this situation: RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  10. 2,8% FWHM VERY PRELIMINARY Pure Xe at 2 bar PRELIMINARY 4,2% FWHM • Risetime-Amplitude correlation hadn’t been observed in Ar measurements. • Different slopes at variable conditions on gas purity convinced us the effect is really due to attachment. RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  11. Pure Xe at 3 bar PRELIMINARY 7,8% FWHM 7,8% FWHM 4,9% FWHM 4,9% FWHM VERY PRELIMINARY RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  12. Pure Xe at 4 bar PRELIMINARY 14,4% FWHM 4,5% FWHM VERY PRELIMINARY RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  13. ? ? Pure Xe: Gain At least 180 Product Q primary · G seems to be the limitation, independent on pressure when working at high Qp and (not so) low gain. PRELIMINARY RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

  14. Summary • Microbulks represent the state of the art in icroMegas in relation to energy resolution (less than 15% @5,9 keV guaranteed in Ar + isoC4H8 at atm pressure). • Results in pure Xe at high energy (5,6 MeV 241Am ) & pressure: • Expected improvements (PROSPECTS) in • Better gas system quality • Quencher • Addition of Light readout • icroMegas geometry VERY PRELIMINARY Gain higher than 180 RD51, Paris 14th October Alfredo Tomás Alquézar, Universidad de Zaragoza

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