1. 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/ R&D proposal Silvia DALLA TORRE

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

3. 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/ WP Silvia DALLA TORRE

4. 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/ WP Silvia DALLA TORRE

5. 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/ WP Silvia DALLA TORRE

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

7. 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/ WP Silvia DALLA TORRE

8. 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 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/ WP Silvia DALLA TORRE

9. 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/ WP Silvia DALLA TORRE

10. 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/ WP Silvia DALLA TORRE

11. R&D PROGRAM
PCB
0.15 mm
fiberglass
Single pad
HV is applied here through a resistor 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/ WP Silvia DALLA TORRE

12. 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/ WP Silvia DALLA TORRE

13. 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/ WP Silvia DALLA TORRE

14. 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/ WP Silvia DALLA TORRE

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

16. 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
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/ WP Silvia DALLA TORRE

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

18. 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/ WP Silvia DALLA TORRE