e MEG II Status of the MEG II

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+ μ + e γ → 探索実験 MEG II の準備状況 (Status of the MEG

+ 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

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

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

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

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 –

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

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

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

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.

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

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

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,

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

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

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

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

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

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

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:

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