e MEG II Status of the MEG II
- Slides: 20
+ μ + e γ → 探索実験 MEG II の準備状況 (Status of the MEG II experiment searching for μ+ → e+γ) 21/March/2015 日本物理学会大 70回年次大会@ 早稲田大学 東大ICEPP 内山雄祐 他 MEG II collaboration
Abstract 1. MEG II is upgrade of MEG experiment, searching for μ→eγ 2. All the detectors are now under construction 3. To carry out a ‘pre’-engineering run in 2015 4. Toward start of data taking in 2016 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 2
Next μ→eγ Experiment l Aim at sensitivity of O( 10 -14 ) – x 10 improvement from MEG l By exploiting the full beam power available today, – ~108 μ+/s at PSI πE 5 l By upgrading the MEG detector – Keep experimental concept – in short (~5 years), at low cost MEG II Experiment 3 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo
MEG II Keep 3 keys of MEG 1. World’s most intense DC μ beam @ PSI 2. Innovative liquid xenon γ-ray detector 3. Gradient B-field e+-spectrometer Double beam intensity, Double efficiency, Suppress BG factor ~30 l Halve every resolution, l Add new detector to identify Yusuke UCHIYAMA/ The University of Tokyo 2015/Mar/21 @ JPSBG 70 th Annual 4
Timeline 2012 2013 Start the project. Conceptual designing. Submit the proposal to PSI Proposal approval. -14 5 × 10 -14 4 ✕ 10 MEG I DAQ R&D 2014 Construction partially start. 2015 Detector construction. Detector commissioning. Pre-engineering run. 2016 Full engineering run. Data taking. 2017, 2018 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 5
10000 Detector technologies # of readout 8000 l Large-area VUV sensitive Si. PM – for the world’s largest LXe detector. (wavelength 175 nm) 6000 l 30 ps precision time measurement – with fast plastic scinti. & Si. PMs l Low mass long stereo-wire drift chamber – 0. 0017 X 0 for a particle l Compact, dense DAQ system – To deal with increased channels – Waveform digitizer & first trigger step in a same board Prototypes 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 4000 2000 0 MEG-II LXe DC 6
21 p. DK 4, 5, 6 LXe γ-ray detector l Large area VUV-MPPC development completed – >15% PDE achieved – 600 prototypes test in LXe performed – Final model (w/ cross-talk suppression) successfully tested. l Final MPPCs (>4000) are about to be delivered. CG Normal MPPC (3× 3 mm 2) VUV MPPC (12× 12 mm 2) 2” LXe PMT 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 7
21 p. DK 4, 5, 6 2015/Mar/21 @ JPS 70 th Annual 8 600 Si. PMs tested in LXe Yusuke UCHIYAMA/ The University of Tokyo
21 p. DK 4, 5, 6 Present detector status l This year, concentrate on the construction l Assembled detector will move to the experiment site in Sep. l Installation & commissioning in Sep-Dec. – Liquefaction – Signal test with limited readout channels l Purification, calibration continued until summer 2016 2015/Mar/21 @ JPS 70 th Annual Disassembly under way Yusuke UCHIYAMA/ The University of Tokyo 9
New drift chamber l All material procurement done. l Wiring will be started soon. l Full chamber will be delivered to PSI by March 2016. l Partially wired ‘mock-up chamber’ will be delivered to PSI by July this year – with HV & gas system – for mechanical integration & operation test Wires soldered on PCB Assembly machine 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 10
24 a. DL 9, 10 Pixelated timing counter l ~30 ps resolution demonstrated under MEG-II condition. Dow nstr eam l 6000 Si. PMs were delivered. l Downstream system will be ready by Sep. this year. Scintillator wrapped in ESR film A counter ream Structure under construction optical fiber 6 Si. PMs at each end 2015/Mar/21 @ JPS 70 th Annual Upst Yusuke UCHIYAMA/ The University of Tokyo 11
24 a. DL 11 New BG tagging detector Radiative Decay Counter (RDC) Upstream scintillating fibers Downstream Plastic scintillator + LYSO l 100 MPPCs for LYSO 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 12
Electronics, DAQ l Innovative solution for Trigger & DAQ – Waveform digitizer, frontend circuit, HV supply, 1 st level trigger on a board l Prototype board under test – Frontend circuit was tested with detector signal l First full crate (256 ch) available by Oct. this year – tested in the pre-engineering run l Mass production will be started after the test l Complete system ready by spring 2016 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 13
Goal of 2015 l Check the mechanical integrity & functionality of the MEG II upgrade design l Enable design corrections & modifications well before Engineering run in 2016 l Enable beam optimization & setup of new target & test of US RDC principle l Aim at Michel beam test of DS Timing Counter system with limited readout 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 14
Schedule l 2015 Beam time granted : 12. 5 (+1. 5 weeks 2015 Apr 4 5 provisional ) – from mid. or end of Sep. 2016 Jan 6 7 8 9 10 11 12 1 DC insertion test Commissioning DC mock-up to PSI 2 Jul 3 4 5 6 7 8 9 10 11 12 Correction, DC installation DC mock-up modification installation. Commissioning US DS TC installation Beam tuning Accelerator shutdown Beamline setup Test beam, trigger Michel st run 1 DAQ crate Complete elec. Muon data DS TC installation Purification, calibration Liquefaction LXe to Area Operation test 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 15
Conclusion l A very important step for MEG II realization foreseen this year p All the detectors are now under construction p We plan to carry out a ‘pre’-engineering run in autumn–winter ü Test mechanical integrity ü Test all the detector signal with limited electronics ü Carry out Michel run with a Timing Counter l Toward data-taking started in 2016 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 16
Target system 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 18
Downstream end-cap 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 19
2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 20
PSI l Paul Scherrer Institut PSI Switzerland World’s most powerful proton beam to targets: 590 Me. V x 2. 4 m. A = 1. 4 MW Proton accelerator complex p, m production target World’s highest intensity p & m beams p. E 5 2015/Mar/21 @ JPS 70 th Annual Yusuke UCHIYAMA/ The University of Tokyo 21 To UCN source
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