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
CSNI, Roma 11/11/ RD_FA, WP Silvia DALLA TORRE

2. OUTLINE Motivations Activity planning Synergies Financial requests
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

3. EIC in a nutshell EIC – Electron-Ion Collider – POLARIZED !!!
recommendation by the U.S. nuclear physics
community in the 2015 Long Range Plan:
EIC is the highest priority for new facility construction
Starting physics in 2025 (optimistic), 2027 (realistic)
Scientic Highlights
Nucleon Spin and its 3D Structure and Tomography
g saturation in nuclei, q and g in nuclei
Beyond SM with electroweak physics
2 options for the collider:
BNL
Gev (e), GeV (p)
for e: ERL – multipass Energy Recovery Linac
L : 1033 – 1034 /cm2/s
Jlab
3-12 Gev (e), GeV (p)
L : 1034 /cm2/s (later, if upgraded, 1035)
CSN I, 3/12/15 by R. De Vita
CSN III, 22/6/16 by A. Bressan
EIC presented in
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

4. APPROACHES TO THE EXPERIMNTS AT EIC
MEIC-dedicated
Optimized for Jlab option interaction scheme
ePHENIX
evolution of PHENIX, sPHENIX
BeAST
Dedicated design
The conceptual approaches include
a high-momentum RICH complemented by a PID option for low momenta (always)
a TPC as major tracking system (2/3 schemes)
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

5. 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 
n. of ph.s ? Increased resolution !
From world-wide effort, 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)
Both approaches foresee gaseous photon detectors
LOW-p complement: PID in the range p < 6-8 GeV/c
Proximity focusing liquid C-F radiators: very limited p range
DIRC-derived schemes: complex, even if very promising
Focusing DIRC, TOP, TORCH
Proximity focusing Areogel: critical procurement
Performance in 2-radiator RICHes ?
We start from here:
next 3 y activity
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

6. 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
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

7. OUTLINE Motivations Activity planning Synergies Financial requests
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

8. ACTIVITY In the next 3 years:
Obtain the ultimate performance of MPGD-based single photon detectors
This implies progresses relevant for up-to-date TPC sensors
Then:
Design the high- and low-p RICH system making base on optimized and proven MPGD PD performance
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

9. 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
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

10. 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
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

11. 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
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

12. R&D planning within RD_FA
Planning over 3 years
4 R&D items illustrated in the following slides
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

13. The 4 tasks in a nutshell resistive MM Further reduction of the Ion
with small
pad size
O(10 mm2)
PCB
0.15 mm
fiberglass
HV is applied here through a resistor ground)
Signal read-out from this pad
SYNERGIC
with TPC
Further reduction of the Ion
BackFlow (IBF) rate:
presently ~ 5%
Issues related to hybrid MPGD-based PDs operated in C-F atmosphere:
photolelectron extraction
Detector gain
ageing
GEM vs THGEM as photocathodes
Photoelectron
extraction
studies
RICH specific
C. D. R. Azevedo et al., 2010 JINST 5 P01002
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

14. OUTLINE Motivations Activity planning Synergies Financial requests
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

15. 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
job: 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
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

16. OUTLINE Motivations Activity planning Synergies Financial requests
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

17. RICHIESTE FINANZIARIE
CONSUMO, cont.
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
CSNI, Roma 11/11/ WP Silvia DALLA TORRE

18. Piano pluriennale di spesa
Test beam !
CSNI, Roma 11/11/ WP Silvia DALLA TORRE