Trieste proposal for the RD_FA : WP - 4 activity & requests S. Dalla Torre, S. Dasgupta, S. Levorato, F. Tessarotto Trieste proposal for the FY2017 Call for Proposals for Generic Detector R&D for an Electron-Ion Collider RD_FA_workshop, Roma 9-10/11/2016 R&D proposal Silvia DALLA TORRE

OUTLINE Motivations Activity planning Synergies Financial requests RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

Slide shown yesterday RICHes (and TPC) The setup designs are still subject to important evolution, nevertheless About 2 crucial elements related to our direct interests RICHes (high & low momenta) are necessary TPC is the central tracking element in 2 approaches All this matches our fields of expertise: RICH detectors MPGDs (the up-to-date approach to high-rate TPC read-out) Slide shown yesterday RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

HIGH & LOW p RICHes HIGH-p: PID in the range 6 < p < 60 GeV/c Radiator: gas is mandatory Collider implementation: short (~ 1 m) radiator length Two possible ways, both requiring deeper exploration High pressure, studied for ALICE upgrade VHMPID Towards the very far UV with window-less approach (prototype tested at Fermilab) In both approaches gaseous photon detectors have been used LOW-p: PID in the range p < 6-8 GeV/c Liquid C-F radiators: very limited p range DIRC-derived approaches complex, even if very promising: Focusing DIRC TOP TORCH Areogel Collider implementation: Critical procurement Problematic in 2-radiator RICHes Large space for intellectual contribution We start from here: next 3 y activity RD_FA_workshop, Roma 9-10/11/2016 WP-4 Silvia DALLA TORRE

TPCs The next TPC generation for high rate operation requires ungated TPCs How? By Ion BackFlow (IBF) suppression in MPGDs IBF suppression recipes deteriorate dE/dx resolution … Parameter tension  appropriate compromise needed The future will start with the upgrade of ALICE TPC 2 options Multiple-layer GEM detectors with different geometries (4 layer & 2 geometries for ALICE upgrade) GEM pre-amplification + a MICROMEGAS (MM) stage, proposed for ALICE (not selected) Resistive MICROMEGAS not yet there In principle superior: intrinsic IBF suppression in MMs In based on THickGEMs and resistive MMs Our approach to gaseous PDs RD_FA_workshop, Roma 9-10/11/2016 WP-4 Silvia DALLA TORRE

OUTLINE Motivations Activity planning Synergies Financial requests RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

THE STARTING POINT: COMPASS RICH-1 UPGRADE The detector architecture each 600 x 600 mm2 detector consists of two modules having 600 x 300 mm2 RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

THE STARTING POINT: COMPASS RICH-1 UPGRADE The bulk MICROMEGAS with resistive anode and capacitive coupling R-O PCB 0.15 mm fiberglass Single pad HV is applied here through a resistor (mesh @ ground) Signal read-out from this pad HV 0.5 GW Resistor arrays Connections for groups of 48 pads Signals RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

OUR RESISTIVE MM – A WINNING APPROACH ! Global (whole hybrid) IBF rate < 5% No resistive coating is present inside the detector volume (CsI there) Stable HV ! Limited spark rates No HV drop when a spark occurs Dead-time control at the level of the most advanced resistive MM approaches (ATLAS SW) PD1 H0 / 10 d HV: MM I: MM 10 d RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

R&D planning within RD_FA Planning over 3 years 4 R&D items illustrated in the following slides RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

R&D PROGRAM PCB 0.15 mm fiberglass Single pad HV is applied here through a resistor (mesh @ ground) Signal read-out from this pad In the COMPASS RICH-1 photon detectors the pad size is 8 x 8 mm2. A first R&D item is passing to smaller pad size of the order of 3 x 3 or 4 x 4 mm2. SYNERGIC with TPC Resistor arrays Connections for groups of 48 pads Signals RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

Preliminary R&D PROGRAM Dilemma: GEMs or THGEMs is a (hybrid) MPGD photon detector for RICHes? the comparative study of the photoelectron extraction in gas atmosphere is the second R&D item by the LEOPARD RICH specific Efficiency map Photoelectron extraction studies Gain map G.Hamar and D. Varga, NIMA 694(2012)16 RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

Preliminary R&D PROGRAM the present hybrid photon detectors have an Ion BackFlow (IBF) rate ~ 5% ultimate figure?  enhancing the control of IBF is a third R&D item synergic to a possible approach to TPC read-out by hybrid sensors, where MMs can be combined to GEMs as already proposed and studied using traditional non-resistive MMs SYNERGIC with TPC RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

Preliminary R&D PROGRAM The performance of the hybrid photon detectors operated in fluorocarbon-rich atmospheres, as it is the case for windowless RICHes, is a forth item. RICH specific C. D. R. Azevedo et al., 2010 JINST 5 P01002 RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

OUTLINE Motivations Activity planning Synergies Financial requests RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

SYNERGIES CSN 1 CSN 5 Non-INFN founds The starting point is the development for COMPASS RICH upgrade Construction completed, commissioning on-going Cultural synergies with the RD51 networking activities CSN 5 MPGD_NEXT, in particular task 4 – High-gain hybrid MPGD jobs: development of THGEM technologies towards large gains Non-INFN founds AIDA2020, WP13 – Innovative gas detectors, task 13.2.5 Overlap with MPGD_NEXT, task 4 EIC R&D (within the ED6 Consortium) Overlap with RD_FA, WP4 RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

OUTLINE Motivations Activity planning Synergies Financial requests RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE

RICHIESTE FINANZIARIE COMMENTI il programma di lavoro dei prossimi 3 anni e' chiaro e definito il finanziamento ricevuto con la call USA «R&D EIC» diventa pienamente efficacie se corredato da matching founds INFN RD_FA_workshop, Roma 9-10/11/2016 WP 4 Silvia DALLA TORRE