1 / 14

Status Report of Neutral Kaon Study by Neutral Kaon Spectrometer 2

Status Report of Neutral Kaon Study by Neutral Kaon Spectrometer 2. Masashi Kaneta for the NKS2 Collaboration Department of Physics, Tohoku University. The experiment. Investigation of strangeness production mechanism Threshold region of production No resonance decay

lotta
Télécharger la présentation

Status Report of Neutral Kaon Study by Neutral Kaon Spectrometer 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Status Report of Neutral Kaon Study byNeutral Kaon Spectrometer 2 Masashi Kaneta for the NKS2 Collaboration Department of Physics, Tohoku University Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  2. The experiment • Investigation of strangeness production mechanism • Threshold region of production • No resonance decay • Good for comparison with models • Small cross-section, i.e. high statistics is required • Neutral channel in strangeness photo-production • Past experiments studied by K+ production • Not enough data for g+nK0+L(S0) • Neutral Kaon Spectrometer (NKS) experiment at LNS-Tohoku • Successfully done in 2004 using NKS • Used TAGX spectrometer of INS • Some weak points was found in TAGX • No coverage on forward region • No Stereo wire in Chambers • Now we are on the second stage (NKS2) • New Spectrometer was designed and constructed in 2004-2006 • Runs in Mar., Jun. 2006 by Carbon target Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  3. The NKS2 Collaboration • Department of Physics, Tohoku University • N. Chiga, T. Fujibayashi, Y. Fujii, K. Futatsukawa, O. Hashimoto, K. Hirose, K. Hosomi, A. Iguchi, H. Kanda, M. Kaneta, T. Kawasaki, D. Kawama, Y. Ma, K. Maeda, N. Maruyama, A. Matsumura, M. Matsuzawa, M. Mimori, K. Miwa, Y. Miyagi, H. Miyase, S.N. Nakamura, K. Nonaka, Y. Okayasu, M. Sumihama, H. Tamura, N. Terada, K. Tsukada • Laboratory of Nuclear Science, Tohoku University • T. Ishikawa, T. Nakabayashi, H. Shimizu, K. Suzuki, T. Tamae, H. Yamazaki • Department of Electrical and Electric Engineering, Akita University • A. Sasaki • Department of Electrical Engineering, Ichinoseki National College of Technology • O. Konno Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  4. Tagged Photon Beam at LNS-Tohoku 0 5m Neutral Kaon Spectrometer 2 200 MeV electron beam from LINAC Sweep magnet 1.2 GeV Stretcher-Booster Ring Photon tagging system Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  5. Tagged Photon Beam at LNS-Tohoku • Photon beam • Electron beam on carbon wire • Tagged by electron which has energy loss • E=0.8-1.1 GeV • from 1.2GeV electron beam • 6 MeV coverage per tagging counter Tagger Backup Tagger Finger Radiator Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  6. Neutral Kaon Spectrometer 2 Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  7. Detector Setup g + n K0S + X p+ p- To measure 3720 mm • 680 magnet • Dipole magnet with 0.42 T • 800mm radius of the pole • Target • Natural Carbon • Liquid deuteron • Inner Hodoscope Outer Hodoscope • Trigger counter • Time of flight measurement • Straw Drift Chamber Cylindrical Drift Chamber • Tracking (momentum) • Decay vertex finding • Electron veto counter (EV) • e+e- background suppression 1700 mm  beam Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  8. Inner Hodoscope 680 Magnet Straw Drift Chamber g beam Outer Hodoscope Electron Veto Cylindrical Drift Chamber Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  9. Run Summary • Two weeks for the run 2006-June • Natural Carbon target • Finished with no physical injury • 2/3 of time is used for setup • to make counters ready • to make efforts of noise reduction • to fix some troubles of DAQ and chamber readout • to re-wiring to fix wires loosed • Trigger study and data taking • 4 days for trigger study • ~11 hours for data taking • Useful data • ~2.7 x 106 events • Number of K0S estimated = ~10 Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  10. Particle Identification • PID by 2D cut on TOF vs. momentum plot • TOF between Inner Hodoscope and Outer Hodoscope • Momentum is reconstructed by hits on CDC and SDC charge sign  momentum [GeV/c] 1/b Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  11. Tracking • Track is reconstructed from hits on CDC and SDC Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  12. V0 Vertex Distribution On beam plane [cm] Counts / bin Vacuum pipe window stays ~50cm from Carbon target Beam direction [cm] Beam direction [cm] With opening angle cut: -0.9<cosq<0.8 Counts / bin Beam direction [cm] • Main background is e+e- pair produced by air • Opening angle cut works to remove background in off-line analysis • Huge number of background in data... • Vacuum pipe was short • Now (Sep. 2006), the window stays at ~20 cm from the target for incoming run Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  13. Summary • We have finished the construction of Neutral Kaon Spectrometer 2 (NKS2) • The commissioning run was carried out • Used carbon target • There were many troubles.., however • Finally we could move to data taking stage • Analysis • the code is ready to use • same with NKS • need to have more work for calibration • Ready to long run for data taking Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

  14. Outlook • Construction • 2004~2005 • Commissioning • 2006, Mar. and Jun. • Carbon target • Detector start-up • Trigger Study • Some modification of detectors after run • 2006 Sep • Trigger Study with longer vacuum pipe • Physics data taking with Carbon target • Deuteron target run • 2 weeks/month over 5 months Masashi Kaneta, Tohoku Univ. 日本物理学会2006年秋季大会　於 奈良女子大

More Related