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The new trigger and data acquisition system for LFV searches in the MEG II experiment

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Relazione sulle attività svolte nel Corso del

dottorato

Marco Francesconi, XXXII Ph.D. Cycle

Supervisors: Alessandro Baldini Donato Nicolò

I spent my Ph.D. working with the MEG group of INFN of Pisa, at the frontline of the experiment upgrade at Paul Scherrer Institut (PSI) in Switzerland. The collaboration is pretty small ~60

researchers from 5 countries, allowing me to have a key role in the experimental collaboration as part of the TDAQ Crew. The Trigger and Data Acquisition (TDAQ) item is shared between INFN sez. Pisa and PSI so, for a big part of the three years, I stayed at the host laboratory to tightly

collaborate with other collaborators.

Working with the TDAQ is a good place to keep in touch all the different detector and items composing the experimental setup having a complete view of the experiment and all its components.

1st year

Attended Ph.D. courses:

• “Fisica delle alte energie”, 50 hours, University of Pisa in collaboration with INFN of Pisa and Scuola Normale Superiore, Final assessment: 95%

• “Analisi statistica dei dati”, 40 hours, University of Pisa, Final assessment: 95% • “Fisica della materia”, 40 hours, University of Pisa, Final assessment: 100% • “Scientific Writing”, 10 hours, University of Pisa

Student seminar:

21-09-17 “Improving hadrotherapy with FOOT experiment” Overall first year final evalutation: ottimo

Research activities abroad:

From 05/12/16 to 16/12/16 Paul Scherrer Institut (CH) MEG II Pre-engineering run 2016

From 04/06/17to 15/06/16 Paul Scherrer Institut (CH) MEG II Liquid Xenon detector commissioning

From 07/05/17-10/05/17 Centro Protonterapia (Trento) Test beam for the FOOT experiment

Conferences:

13/09/17 “Stato dell’esperimento MEG II” Talk in parallel session, Congresso SIF, Trento Workshops:

26/03/17-31/03/17, Lepton Flavor Physics with Most Intense DC Muon Beams, Tokyo (JP) Talk on Montecarlo based trigger simulations

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2nd year

Student seminar (Pre-thesis):

22-10-18 “Online event selection for the MEG II Experiment” Overall second year final evalutation: ottimo

Research activities abroad: From 06/11/17-24/11/17 and

From 04/12/17-24/12/17 Paul Scherrer Institut (CH) MEG II Pre-engineering run 2017

Conferences: 30/05/18

“Low latency serial communication for MEG II trigger system” Poster, Pisa Meeting on Advanced Detectors, La Biodola (IT) 10/06/18

“The WaveDAQ integrated Trigger and Data Acquisition System for the MEG II experiment” Talk in plenary session, IEEE NPSS Real-Time 2018, Colonial Williamsburg VA (USA)

Workshops:

03/04/18-09/04/18, Global Developments of Researches in Lepton Flavor Physics with Muons, Tokyo (JP)

Talk on Trigger status

06/06/18-08/06/18, Global Developments of Researches in Lepton Flavor Physics with Muons, Paul Scherrer Institut (CH)

Talk on Trigger status

3rd year

Research activities abroad (continued from previous year): From 01/05/18-18/09/19 Paul Scherrer Institut (CH)

Continuous on-field presence for Trigger commissioning and support to Drift Chamber commissioning (financiary support from INFN and “Borsa Angelo della Riccia”)

Workshops:

19/03/19-21/03/19, Global Developments of Researches in Lepton Flavor Physics with Muons, Tokyo (JP)

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Thesis Title:

The new trigger and data acquisition system for LFV searches in the MEG II experiment Thesis summary:

The MEG II experiment aims at a factor 10 improvement in the branching ratio limit of the muon to electron plus photon decay; it follows the path traced by its previous phase (known as MEG I) which already produced the world best upper limit of <= 4.2 10^-13 @ 90% C.L. The new

experimental apparatus is currently in its commissioning phase at Paul Scherrer Institute in Switzerland.

In this thesis a novel Trigger and Data acquisition (TDAQ) system, named WaveDAQ, is described with the goal of fulfilling the requirements of the experiment upgrade, the most stringent one being the readout of ~8000 channels at GHz speeds. The single event size will be therefore in the order of 12 MB without any compression or zero-supperession, thus a very selective yet efficient online event selection needs to be operated to maintain the throughput at a reasonable level (< 24 Hz).

The first results of the new apparatus in 2018 and 2019 pre-engineering run are reported validating the full design of the TDAQ system toward its final production in 2020.

Having the capabilities to increase the the event speed in dedicated runs up to few 100 Hz, exotic Lepton Flavor Violating channels in reach of MEG II are presented and sensitivity on the muon to electron plus invisible was studied. Results show a very huge effect of momentum scale

uncertainty on the measurement which needs to be fixed below the 5 keV/c level in order for MEG II to be competitive with current limits of ~10^-5 by the TWIST collaboration.

Relevant publications:

Typology of

publication Authors Title References

Article A.M. Baldini et al.

The design of the MEG II

experiment. The European Physical Journal C 78.5 (2018): 380.

10.1140/epjc/s10052-018-5845-6 Article G. Boca et al. The laser-based time

calibration system for the MEG II pixelated Timing Counter.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated

Equipment 947 (2019): 162672. 10.1016/j.nima.2019.162672 Article M. Morrocchi et al. Development and characterization of a ΔE-TOF detector prototype for the FOOT experiment

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated

Equipment 916 (2019): 116-124.

10.1016/j.nima.2018.09.086 Proceeding L. Galli et al. WaveDAQ: An highly

integrated trigger and data acquisition system

Proceeding of Pisa Meeting on Advanced Detectors 2018

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated

Equipment 936 (2019): 399-400.

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proceeding M. Francesconi et al.

Low latency serial communication for MEG II trigger system

Proceeding of Pisa Meeting on Advanced Detectors 2018

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated

Equipment 936 (2019): 331-332.

10.1016/j.nima.2018.09.153 proceeding S. Kobayashi et

al.

Precise measurement of 3D-position of SiPMs in the liquid xenon gamma-ray detector for the MEGII

experiment.

Proceeding of Pisa Meeting on Advanced Detectors 2018

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated

Equipment 936 (2019): 189-191.

10.1016/j.nima.2018.10.170 proceeding M. Chiappini et

al.

The new drift chamber of the MEG II experiment

Proceeding of Pisa Meeting on Advanced Detectors 2018

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated

Equipment 936 (2019): 501-502.

10.1016/j.nima.2018.10.182 proceeding M. Nishimura et

al.

Full system of positron timing counter in MEG II

having time resolution below 40 ps with fast plastic scintillator readout by SiPMs

Proceeding of Vienna Conference on Instrumentation 2019

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated

Equipment 958 (2020): 162785.

10.1016/j.nima.2019.162785

Two articles currently in process of publication:

D.Nicolò et al., “Real-time particle identification in liquid Xenon”, submitted to NIMA T.Libeiro et al., “X-Ray scanning technique for Alignment of Photosensor”, internal review

Other activities:

I took part to 11 MEG II Collaboration meeting over the three years with talks on Trigger and Data Acquisition commissioning status.

I was present at three “Open User Meeting” (editions 2017, 2018 and 2019) organized by LTP-NUM department of PSI (CH).

I gave one presentation to INFN referees experiment in the TDAQ status as substitute for the INFN responsible researcher.

The code I developed to handle the MEG II readout is currently being used also by the FOOT experiment.

In the last year I started contributing to the development of Midas DAQ software

(http://midas.triumf.ca), which is the backend of MEG II TDAQ and is used by several others experiment.

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