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PADME status report

PADME status report. M. Raggi a,b a Sapienza Università di Roma, b INFN Roma. The physics case(s). Dark Photon arXiv:1608.08632v1. ALPs and g-2 arXiv 1607.01022v2. Fifth force arXiv:1608.03591v1. Invisible final state e + e - → cc ( g +missing mass). ALPs final state a → gg

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PADME status report

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  1. PADME status report M. Raggia,b aSapienzaUniversità di Roma, bINFN Roma CSN 1 - March 2017

  2. The physics case(s) Dark Photon arXiv:1608.08632v1 ALPs and g-2 arXiv1607.01022v2 Fifth force arXiv:1608.03591v1 Invisible final state e+e-→cc (g+missing mass) ALPs final state a→gg (gggor egg) Final state X→e+e- In all of this 3 papers PADME cited among the experiments able to improve the current limits CSN 1 - March 2017

  3. Sensitivity Candidate Signal selection (simple and robust cuts) • Just one cluster in the calorimeter • 30 mrad < θCl < 65 mrad • Emin(MA’) < ECl < Emax(MA’) • No track in the positron veto within ±2 ns • No cluster in small angle detector with E>50 MeV within ±2ns • Missing mass in the region: MA’± σMmiss(MA’) • Monte Carlo simulation extrapolated to 1x1013positrons on target • Using N(A’g)=s(NBkg) • With very simple cuts, far from no-background sensitivity (improvements are possible) • Cross-section enhancement due to A’ mass CSN 1 - March 2017

  4. Cross section at PADME For these energies, in Geant4 EM usually theoretical formulas are used for majority of models. Comparison with the data allow to clarify validity of chosen models and their configurations. For EM physics, there are not much data which can be used for validation purposes. For example, known data for bremsstrahlung thin target are available for 1-2 MeV, 15-30 MeV, and 8, 25, 170, 250, 300 GeV. Of course, there are checks in each experiment for calorimeters as a whole, where EM shower is measured and all processes contribute together. I do not know good thin target data suitable for comparisons for 100-1000 MeV energy range for bremsstrahlung. From my point of view, your measurements may be very useful.  Ivantchenko GEANT4 low energy EM library manager CSN 1 - March 2017

  5. Final setup High Energy Positron veto 1 cm scintillators with SiPM readout Dipole MBP-S (transfer line SPS) Positron beam Calorimeter BGO crystals 21×21x230 mm3 Diamond target 50-100 mm g Positron veto 1 cm scintillators SiPMreadout A’ Small Angle Calorimeter Electron veto 1 cmscintillators SiPM readout CSN 1 - March 2017

  6. Beam region and vacuum chamber MIMOSA beam monitor Diamond target • Baseline layout available for both vacuum chamber and target region • Details to be fixed • New board to operate the MIMOSA chips in vacuum in advanced state CSN 1 - March 2017

  7. The diamond target Readout board Vacuum vessel test • Both graphite and metallic strips targets ready • Both 50 and 100 μm samples available • Readout electronics ready • Mechanics and motorized system ready(vacuum tests on-going) CSN 1 - March 2017

  8. Front end electronics • Electronics CSA Amadeus chip chosen • Timing performance degraded but good signal to noise ratio. • We only need to measure the charge, so it is OK CSN 1 - March 2017

  9. Calorimeter status 19 mm PMT • 5×5 prototype: energy resolution 2.3% at 1 GeV • Submitted to Nucl. Instrum. Meth. A, arXiv:1611.05649 • 650 PMT’s: tender assigned: HZC XP1911 • HV supply: tender assigned: • CAEN A7030 + SY4527 • Mechanical structure and assembly procedure: advanced design • Crystals preparation completed • Extracted from L3 barrel • High-temperature annealing • Travelling on March 23th • Machining, gluing and painting: tender assigned, Gestione SILO • Waveform digitizers: tender assigned: CAEN V1742 • 1 – 5 GS/s • 896 channels • 896 channels: Calorimeter + Veto detectors + Target

  10. Optimized positron veto geometry • Increased scintillator dimension from 16 cm to 18.4 cm • New clear area 17.4 vs 16 cm • Better veto efficiency and less passive material CSN 1 - March 2017

  11. Veto detectors • 10×10x180 mm3scintillator • All scintillator bars delivered • Design of the mechanics ready • Prototype of the mechanical assembly ready • Prototype electronics prototype ready • Test-beam in April to measure efficiency and time resolution • Read-out by same digitizing system as calorimeter (ready) CSN 1 - March 2017

  12. In beam veto detector CSN 1 - March 2017

  13. Progress on MC simulation CSN 1 - March 2017

  14. Summary of tenders 2016 • During 2016 we assigned 4 tenders for calorimeter components • 630 Crystal preparation: Cutting, polishing, painting and PMT gluing of the crystals (Gestione SILO 65 kEuro, no savings) • Calorimeter HV system: CAEN SY4527 Main frame with ~630 single HV channels, A7030 48 channels boards (84 kEuro, saved 1 kEuro) • 630 PMT bid: 630 PMT 19mm with divider (HZC Photonics, 138K€, saved 22 k€) • Readout: 28 digitizer boards, 32 channels (CAEN V1742, 226 K€+IVA, saved 29 K€) • We ask to recover the savings in the 2017 budget • Total savings 51K€ CSN 1 - March 2017

  15. Assegnazioni 2017 50 mecc. ECAL 35 Vac. 10 FE Veti CSN 1 - March 2017

  16. Missionicriticità 2017 • Sofferenza a Roma a causa di: • Missionideitecnici al CERN per recuperocristalli BGO • Raggi non fapiù parte del programmaMinisteroEsteri– USA • InoltreRaggi (co-PI e RN) passato a Roma CSN 1 - March 2017

  17. SAC costs • Assegnazione SAC 2017 = 41 kEurocostototale del rivelatore • Chiaritoildisegnovedi talk M. Raggi a seguire • Costiprevistinuovodisegno: • 25*(650+IVA) = 20 kEuro , fast PMT’s (Offerta Hamamatsu H13478-UV) • 25*(2000+IVA) = 61 kEuro, PbF2 (Offerta SICCAS) • Per realizzareilrivelatore small angle mancherebbero40 kEuro, ma abbiamorisparmiato52 kEurodairibassidellegare 2016, cheappuntochiediamo di recuperare CSN 1 - March 2017

  18. Anagrafica PADME 2017 Researchers 4.9+1 FTE INFN Lecce G. Chiodini 30% S. Spagnolo20% Pietro Creti (I tec) 20% Viviana Scheriniass INFN 30% INFN Lecce and UniversitàSalento A. Caricato (ric) 30% G. Maruccio (Professore) 20% M. Martino (Professore) 30% A. Monteduro (AdR) 20% INFN LNF (DivisioneRicerca) P. Albicocco 30% R. Bedogni20% F. Bossi 30% R. De Sangro 20% G. Finocchiaro 20% P. Gianotti 30% M. Palutan 20% G. Piperno (A.d.R.) 100% I. Sarra (A.d.r) 20% B. Sciascia 20% T. Spadaro 20% E. Spiriti 10% C. Taruggi 100% (Ph.D. Tor Vergata) V. Kozhuharov (Università Sofia) 50% G. Georgiev (Università Sofia) 50% (DivisioneAcceleratori) B. Buonomo (20%) L. Foggetta (20%) A. Ghigo (10%) INFN Roma P. Valente 50% F. Ferrarotto50% E. Leonardi50% (Tecnologo) S. Fiore (ENEA) 20% F. Ameli 20% (Tecnologo) INFN Roma and UniversitàSapienza G. Organtini (Professore) 30% M. Raggi (RTDb) 50% 2. FTE 2.7 FTE Total 10.6 FTE 32+1 researchers +6 wrt 2016 Just 1 post-doc Supportotecnico INFN Roma M. Nuccetelli (20%) D. D’Angelo (20%) INFN LNF (SPAS) C. Capoccia (Progettistameccanico) 50%E. Capitolo (Progettistameccanico) 50% (SELF) G. Corradi (ProgettistaElettronico) 30% FrascatiOfficinameccanica 2 mesiuomo II sem (2016) INFN Lecce G. Fiore (Tecnico e progettista) 30% INFN Lecce and UniversitàSalento M. Corrado (Tecnico) 20% C. Pinto (Tecnicoelettronico ) 20% CSN 1 - March 2017

  19. Seminars 2016 Chair of the PADME Editorial Board/Conference Committee: StefaniaSpagnolo CSN 1 - March 2017

  20. Talks a conferenze 2016 19 talks totali CSN 1 - March 2017

  21. External collaborations • University of Sofia, prof. VenelinKozhuharov and collaborators • Memorandum of understanding signed, Bulgarian team associated to LNF • Responsibility of scintillator veto detectors • Participating to test-beam and preparation activities • Obtained a 60K€ grant to participate into PADME in the next 3 years! • MTA Atomki, Debrecen (Hungary), prof. Attila Krasznahorkay and collaborators • Mutual agreement signed • Exchange of researchers and students • Lasts 3 years • Two researchers joining April test beam • Cornell University, CLASSE high-energy physics laboratory, prof. James Alexander and collaborators • Mutual agreement being signed • Exchange of researchers and students • Joining test-beam and development activities on calorimeter CSN 1 - March 2017

  22. PADME updated schedule CSN 1 - March 2017

  23. Plan 2017-2018 2017: construction and installation • Procurement of all components (excluding vacuum vessel): end of May • Construction of calorimeter, small angle and veto detectors: by end of Oct. • Installation: Nov. – end of year • BTF closes from end of July to April 2018 for maintenance, building of the second line, installing PADME 2018: commissioning and running • PADMEaims at collecting 1x1013positrons on target by the end of 2018 • Approved running time • 1 April – 31 July + 1 November to end of 2017. • Assuming a 65% efficiency with 200 ns pulse length: • 1.5*107s*49 pulses/s*20000 e+/pulse*0.65 = 1013 e+ on target CSN 1 - March 2017

  24. Running plan 2017 2018 2019 CSN 1 - March 2017

  25. Conclusions • PADME experiment is extending the physics case to other dark sector models • Dark Photons, ALPs searches & Fifth force • Also extending the Collaboration • Successful improvement of the bunch length obtained by LINAC+BTF staff • Bunch length from 40ns  250ns • Successful 5×5 prototype calorimeter beam-tests in July & November: • Energy resolution s(E)/E = 2.0%/sqrt(E)+1.1% • Mechanical design of the experiment advanced • Details on glue, paint, support, etc. being refined • Vacuum vessel defined • Other main components in good shape: • Veto detectors being finalized, also proceeding on the electronics • Small angle first test successful • Active diamond target practically ready (including readout electronics) • Core 2016 used to procure all the components for calorimeter construction • Core 2017 already secured by CSN1 in September meeting • In line for starting physics data-taking at the beginning of 2018 CSN 1 - March 2017

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