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g beam test of the Liquid Xe calorimeter for the MEG experiment

JPS meeting Mar.‘03 @ Touhoku-gakuin. g beam test of the Liquid Xe calorimeter for the MEG experiment. MEG 実験用液体 Xe カロリメータの γ ビームテスト. by Hajime Nishiguchi @ Univ. of Tokyo. 西口　創 ＠ 東京大学. 東大 ， 早大理工総研 A ， 高エ研 B ， 阪大 C PSI D ，INFN-Pisa E ，BINP-Novosibirsk F

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g beam test of the Liquid Xe calorimeter for the MEG experiment

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  1. JPS meeting Mar.‘03 @ Touhoku-gakuin gbeam test of the Liquid Xe calorimeter forthe MEG experiment MEG実験用液体 Xe カロリメータのγビームテスト by Hajime Nishiguchi @ Univ. of Tokyo 西口　創 ＠ 東京大学 東大，早大理工総研A，高エ研B， 阪大C PSID，INFN-PisaE，BINP-NovosibirskF 大谷航，小曽根健嗣，菊池順A，久野良孝C，澤田龍，鈴木 聡A， 寺沢和洋A，道家忠義A，春山富義B，真木晶弘B，真下哲郎，三橋利也， 三原智，森俊則，八島純B，山口敦史A，山下雅樹A，吉村浩司B，吉村剛史A A.A.GrebenukF，D.GrigorievF，I.IoudineF，D.Nicolo’E，S.RittD，G.SignorelliE

  2. Outline JPS meeting Mar.‘03 @ Touhoku-gakuin • MEG Experiment • Detector Overview • Liquid Xenon Calorimeter • gbeam test • g beam test overview • Beam test , using g from LCS • Beam test , using g from Nuclear Reaction • Other topics • Summary

  3. I. MEG experiment JPS meeting Mar.‘03 @ Touhoku-gakuin I. MEG experiment ( The search experiment form eg@ PSI )

  4. I. MEG experiment JPS meeting Mar.‘03 @ Touhoku-gakuin Detector Overview • Sensitivity down toBR~10-14 • Most intense DC muon beam • at PSI • Liquid xenon photon detector • Positron spectrometer with • gradient magnetic field • Thin superconducting magnet • Positron tracker and timing • counter • Engineering run will start in • 2004 • Collaboration

  5. I. MEG experiment JPS meeting Mar.‘03 @ Touhoku-gakuin Prototype detector • 228 PMTs • 110 Liter Liquid Xenon • (xenon active volume : 68.6 liter) • check for the detector operation • g beam test up to 40 MeV • absorption length measurement

  6. II. g beam test JPS meeting Mar.‘03 @ Touhoku-gakuin II. g beam test

  7. II. g beam test JPS meeting Mar.‘03 @ Touhoku-gakuin Importance of g beam • Performance test • Check the liquid xenon operation • Check the detector components • Check the detector stability • Check the detector resolution ( Energy resolution , Position resolution , Timing resolution ) • Energy calibration • ~50MeV region ( signal level ) • low ~ middle energy region • We want various energy g beams

  8. II. g beam test JPS meeting Mar.‘03 @ Touhoku-gakuin Candidates of the g source • Using Radio Isotope ( ~ 5MeV ) ( 60Co : 1.33MeV , 88Y : 1.84MeV , Am/Be : 4.43 MeV ) • Using Laser Compton Scattering ( 20MeV ~ GeV ) ( TERAS @ AIST : 20MeV , 40MeV , and so on …) • Using Nuclear Reaction • 7Li(p,g)8Be : 17.6MeV (Ep=440keV , s~5mb) • 11B(p,g)12C : 22.6MeV (Ep=7.2MeV , s~120mb) • 9Be(3He,g)12C : 31.2MeV (EHe=6.5MeV , s~1.5mb) and so on … • Using p- beam ( 55 ~ 83 MeV ) (sharp edge of g energy from p-p gp0n process)

  9. II. g beam test JPS meeting Mar.‘03 @ Touhoku-gakuin Laser Compton facility , TERAS @ AIST TERAS : Electron storage ring at AIST (National Institute of Advanced Industrial Science and Technology ) (Old , Electrotechnical Laboratory , Bureau of Electrocommunications) Laser Compton Scattering facility ; 2nd Laser :20MeV(max) g beam obtained 4th Laser :40MeV(max) g beam obtained g beam test has been performed calculated g beam energy spectrum at TERAS

  10. II. g beam test JPS meeting Mar.‘03 @ Touhoku-gakuin Results , expected performance • Detector operation: • All components of the detector worked well ! • Resolution: • Energy : worse　( sE = 1.4 ~ 2.0 % expected ) • Position : sx = 7.2 ~ 11.8 mm ( sx = ~ 4 mm expected ) ( in FWHM respectively ) • Light absorption problem !! • Absorption length increased , 7cm g >3 m by Xenon purification • New g beam test planed @ TERAS in last October & February • Unfortunately , accelerator trouble happened again and again !!  • Next g beam test will be performed in late April .

  11. proton 12C* 12C • E(g0) = 22.6MeV • E(g1) = 18.2MeV )) ) 11B 22.6MeV Gnd or 1st (proton capture) (excited to 12C*) (transit to gnd level) (and radiate energy as g ray) II. g beam test JPS meeting Mar.‘03 @ Touhoku-gakuin g from the nuclear reaction • Using g beam from the nuclear reaction • Example ; 11B(p,g)12C : 22.6MeV (Ep=7.2MeV , s~120mb) • Need to check something; • Rate • Backgrounds • Energy spread • Test experiment has been performed with NaI @ Tsukuba univ. Merits : various channels , easy Demerits : low rate , backgrounds

  12. II. g beam test JPS meeting Mar.‘03 @ Touhoku-gakuin g beam test @ UTTAC , Tsukuba univ. • Proton beam delivered by UTTAC (University of Tsukuba : Tandem Accelerator Center ) • Boron powder target hardened with epoxy resin • Counter : f5” x t5” NaI crystal with 5” PMT and 4 veto counters ( up , right , left and front side ) Proton beam NaI counter Veto counter Pb shield and collimator Scattering Chamber (target inside) g Coverage : 0.13%

  13. II. g beam test JPS meeting Mar.‘03 @ Touhoku-gakuin Results of test experiment , using NaI Obtained Energy Spectrum Monte Carlo ( for NaI ) 5“ x 5” crystal 30” x 30” crystal Counting rate : ~ 16Hz  predicted rate : ~ 13Hz Backgrounds rate : 3Hz ( 0.3Hz after veto) Problems : neutron BGs and other reactions Next step : new target & using Xenon Monte Carlo (for Xenon)

  14. Collision point Dipole g QF QD II. g beam test JPS meeting Mar.‘03 @ Touhoku-gakuin Other candidate • Timing resolution : • We’ve never measured the timing resolution of the Liquid Xenon detector , using high energy g beam . • Tagged g beam of the Laser Compton Scattering ( We plan this test on the next g beam test @ TERAS ) Tagging by scintillation counter Scattered electron Collision point LCS g beam Electrons in the storage ring Laser

  15. II. g beam test JPS meeting Mar.‘03 @ Touhoku-gakuin Other candidate - cont’d • Using p- beam : • We shall also make in-suit calibration runs with p- beam ( using the sharp edges of g energy from p-pgp0n process ) • We plan this test in October @ PSI pE5 beam line ( This beam test will be performed by prototype detector ) 54.9 MeV 82.9 MeV MeV Liquid Xenon Detector g 175< p- 170< target g q p0(28MeV) gg g 54.9 MeV < E(g) < 82.9 MeV Solenoid coil Crystal counter

  16. EXTRA JPS meeting Mar.‘03 @ Touhoku-gakuin Design work on the Final detector Design work almost complete. Construction will start in this summer

  17. IV. Summary JPS meeting Mar.‘03 @ Touhoku-gakuin • We plan the newm egsearch experiment @ PSI • and R&Ds are progressing now. • Our g beam test using prototype liquid xenon calorimeter @ TERAS has been suspended because of accelerator trouble , and the next g beam will be carried out with many improvements in late April. • We also tested using g from the nuclear reaction @ UTTAC , and confirmed the g beam function well. • We plan some tests ; • April : 20 & 40 MeV LCS g beam test @ TERAS • May : nuclear reaction g beam test @ UTTAC • October : p0ggg beam test @ PSI

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