ATLAS RPC phase-2 proposal
Completion of the detector for the barrel muon trigger via the installation of
new trigger stations in the inner layer of the spectrometer (currently
equipped only with MDTs)
Increase the number of measurement stations from 2  3
Increase the number of independent layers from 6  9
RPC3
RPC2
RPC1
RPC0
(BI)
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
1
ATLAS RPC phase-2 proposal
The inner layer was already considered in the original project of the barrel
trigger detector, but at that time the need for the 3rd station was not
stringent and it was cancelled
Trigger performance improvements with the new RPC inner layer:
- larger acceptance
The new chambers will substantially increase the trigger coverage by
filling the acceptance holes due to the barrel toroid support structures
- increased selectivity
The larger lever arm and the improved spatial and time resolution of the
new RPCs will allow to apply a sharper momentum cut
- increased chamber redundancy and longevity
the new layer will increase the redundancy well above the current 3/4
low-pt majority. This will also allow to operate the middle chambers at
lower voltage, decreasing the integrated charge, without loss in the
overall trigger efficiency
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
2
Barrel trigger coverage
High-Pt trigger acceptance currently limited at ~72%
due to non-instrumented regions in:
- feet + elevators (partial recovery in LS1)
- toroid (and ribs) in BM chambers of small sectors
LVL1 barrel
Holes are not projective and 3/3 RPC chambers
are required in the trigger
 with RPC BI chambers use 3/4 request
η=0.0
0.4
0.75
1.0
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
3
Barrel trigger coverage
Single muon MC study
for different trigger options
current
trigger logic
Trigger requirement
Acceptance wrt muon
reconstruction, ηmuid<1.05
RPC1 && RPC2 && RPC3
72%
RPC0 && (RPC1||RPC2) && RPC3
82%
any 3 out of 4 chamber layers
88%
(any 3 out of 4) || ( inner && outer) 96%
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
4
Redundancy exploitation
The produced charge, responsible for the
detector aging, can be reduced
by decreasing the operating voltage
(this is equivalent to work at lower rate and
much lower current)
The detector efficiency will consequently
decrease
1.2
Efficiency
1
0.8
0.6
0.4
0.2
0
8500
9000
9500
10000
Standard voltage (V)
- the loss in efficiency is compensated by a less
stringent requirement in low-pt trigger:
3/4  2/4 majority
- the rejection power would be guaranteed by
the additional RPC in the BI chambers
2/4
3/4
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
5
Requirements on the new RPCs
According to Atlas requirements the qualification tests were done taking as reference
luminosity L=1034 cm-2 s-1, assuming 10 years of running at max background rate of
100 Hz/cm2 (including a safety factor of 5 wrt simulation)
Expected max rate in new inner layer ~1 kHz/cm2:
need to improve the long term RPC rate capability to sustain the LHC luminosity in
phase-2
Limited space available for the installation in the inner layer: ~5cm
Reduced gas gain:
- thinner gap 2  1 mm
- thinner electrodes 1.8  1.2 mm
- increased amplification in front-end electronics
Improved spatial and time resolution:
- timing is improved by reducing the gap thickness
- use ToT and charge centroid to improve spatial resolution
Reduced detector thickness
- higher-quality mechanical structures
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
6
CMS RPC phase-2 proposal
Two types of upgrades proposed for the
CMS RPC muon system:
1. Aging and longevity: built in 2003
and installed in 2007, must
continue to operate without
significant degradation
degradation (<eff> = 95%, CS < 3,
noise < 1 Hz/cm2) well beyond the
design expectations of the LHC; in
particular, with respect to a large
integrated radiation dose and also
a very long time period of
operation.
2. Upgrade of high eta region: keep performance of trigger and
low pT<20GeV threshold even at an increased luminosity
• Background rejection and muon reconstruction
• Costant trigger rate with PT < 20 GeV
• HZZ*2m, 4m; Ht+t-mX; etc
• NEW STATIONS RE3/1 and RE4/1
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
7
RE3/1 & RE4/1
• Propose to cover
the very forward
region
(1.6< |h| <2.4)
Barrel muon system is covered with 8 layers of chambers (58 hits max)
Endcap region is covered with 8 layers (28 hits max)
High eta region is covered with 4 layers (24 hits max)
– 144 chambers (about 1.5-2.0 m2 area) for the
inner (ring n.1) region of disks 3 and 4
– Rate: 1-2 kHz/cm2
•  x5 limit tested for existing RPC chambers
– Integrated charge: 1-2 C/cm2 @ 3000fb-1
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
8
CMS RPC in muon reconstruction
During RUN1 the stability of
the muon system has been
assured thanks to the 2
independent trigger/detector
systems.
A major CSC faults occurred in
the 2012 (7 chambers off in
ring1) but thanks to the RPC
(ring 2) we were able to
recover part of the inefficiency
even in this region. With a full
coverage the system will be
stable in case of any trouble.
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
9
CMS RPC in muon trigger
• All 3 muon triggers (RPC,
DT, CSC) contribute to the
stability of the muon trigger
efficiency and to the
control of the rate.
• From year 2016, all the
muon data will be used in a
unique algorithm in order
to have more robust system
in the view of the
lumi/background increment
planned.
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
10
Joint ATLAS-CMS phase 2 R&D
CMS-specific
• Operation at 1-2kHz/cm2, 1-2 C/cm2 @3000fb-1
• Improved time resolution (10-100)ps
– Background reduction
– Secondary vertices
• iRPC
– Large area, improved:
•
•
•
•
Thin gap
Multigap
High voltage connections
Gas distribution and inlet.
– with HPL / glass electrodes
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
11
1. Electrodes
Lower resistivity materials will be investigated
- construction of low resistivity HPL electrodes  higher rate
- Investigation of low resistivity glass electrodes and chamber developed by Chinese
Tech. Univ.  higher rate + multigap (timing)
Thinner electrodes will be tested to improve the S/N ratio, the spatial resolution and to
reduce the stress (HV working point) and the aging
- construction of gas volumes with thin HPL electrodes
- Construction of multi-gap RPC based on thin HPL electrodes
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
12
HPL: R&D relativo alla produzione di lastre di HPL a bassa resistività. Obiettivo è il
raggiungimento di un valore di resistività inferiore di un ordine di grandezza rispetto
a quello attualmente utilizzato (1÷6 x 1010 Ohm cm).
Questo R&D è di interese comune ATLAS-CMS ma sarà seguito da CMS che ha
studiato e contribuito allo sviluppo della produzione di HPL per RE4 con una nuova
ditta di laminati (Puricelli) dopo la chiusura della ditta Panpla che aveva prodotto
tutto l’ HPL per gli RPC degli esperimenti a LHC. La misura di resistività sarà fatta da
CMS mentre il test della long term conductivity da ATLAS
Tot
HPL
Transportation
Resistivity Meas
35
20
5
10
• Acquisto di un batch di HPL (1 batch= 80 lastre da 1.6 m x 3.2 ;) . Questo quantitativo è
sufficiente per un certo numero di prototipi da 1mq per entrambi gli esperimenti e per
circa 5 prototipi0 (fulls size) per ogni esperimento : 8 kEuro
• Sperimentazione bassa resistività presso la ditta Puricelli : 12 kEuro (basato su circa 50
test )
• Misure di resistività: costruzione di uno strumento portatile per la misura di resistività
(alimentatore,adc,elettrovalvole, consumables) 7 keuro
• Test di long term conductivity sull’HPL : 3 keuto
• Trasporti: le lastre saranno tagliate presso una ditta milanese e inviate alla GT per la
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
13
costruzione
dei prototipi: 5 keuro
2. Chamber prototypes
- construction of a small set of reduced size prototype (thin, multi-gap, different
resistivity...) for a maximum of 10 chambers to test in common (ATLAS/CMS)
- Test at GIF++ and in the lab.
- construction of a finale module -1 prototypes that fits all the specific
requirements of the two experiments.
- Test at GIF++ and in the lab.
- Technological improvements:
- Gas inlets and connection to the internal pipes
- Gas distribution and connectors (simulation and test)
- High voltage connection on the gap and connectors
- Mechanics for the thin gap and multigap (also for the specific requests of the
two experiment)
- Strip foils and connection to the electronics
- Cooling for the new electronics
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
14
3. High performance FEE
CMS production chamber
Prototype developed by R.Cardarelli
Tests on 2mm gaps
- CMS
turn-on efficiency curve shifted by ~460V
ATLAS lab
- ATLAS
comparison in lab with the ATLAS FE
at the same efficiency: x7 reduced charge;
fully efficient up to 7 kHz/cm2 at GIF
Total charge vs HVeff
Highlighted points at 90% efficiency
Red: ATLAS FE / Blue: new Si FE
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
15
The block diagram of the preamplifier
The same scheme can be used for both Si and SiGe technology for a comparison
Si technology
SiGe technology
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
16
Signal and noise
from Si-amplifier and SiGe-amplifier
Pulses recorded from a 500 micron diamond sensor irradiated by 241Am source
Silicon amplifier
SiGe amplifier
Signal amplification
x1.4 improvement
(same scale)
Noise comparison
(same scale)
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
17
Cost estimation
• Il presente progetto mira a realizzare, in forma di multi-project
presso la ditta Europractice, 40 circuiti full custom da 8 canali
ciascuno
• Il programma prevede i passi seguenti
–
–
–
–
Dis.+Test circuito analogico: 1 giro di fonderia,
Dis +Test Circuito analogico+digitale: “
“
Ottimizzazione “
“
“
“
Produzione di 40 prototipi
“
“
15 kE
50 “
50 “
50 “
• I primi tre punti sono già coperti da altri progetti-finanziamenti. Si
richiede il finanziamento di un giro di fonderia dedicato alla
produzione dei prototipi da utilizzare nel proposto R&D
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
18
4. The Quest for ecogases
Ref: CMS Technical Proposal (July 2014)
The European Community has prohibited the production and use of gas
mixtures with Global Warming Power > 150 (GWP(CO2) = 1)
This is valid mainly for industrial (refrigerator plants) applications
C2H2F4 is the main component of the present RPC gas mixture:
GWP(C2H2F4) = 1430, GWP(SF6) = 23900, GWP(iC2H10) = 3.3
C2H2F4 and SF6 Crucial to ensure a stable working point in avalanche
Similar problem for CF4 (GWP = 5800) used in GEMs for time resolution
 On the physical and chemical properties of this components we:
 Designed FE electronics and chambers
 Did all performance, ageing and calibration tests
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
19
4. The Quest for ecogases: Plan
Test molecules similar to C2H2F4 but with lower GWP
 C3H2F4 – tetrafluoropropene (GWP=4)
Should replace C2H2F4 as automotive air-conditioning refrigerant
 C2H4F2 – difluoroethane (GWP=120)
Also studied to replace C2H2F4 as a refrigerant
C2HF3Cl2 (GWP=93),
others…
 Plan to measure all the detector response parameter (time, charge spectrum, streamer
separation, noise, efficiency, possibly drift velocity, etc)
 HUGE PARAMETER SPACE, NEED TO DIVIDE MEASUREMENTS BETWEEN FACILITIES
 Test at the GIF++ will follow on a short list of candidates ecogases to measure the
performance in a realistic environment
 Rate capability, performance under stress, HF yield  already being setup at GIF
 New ageing tests (to be performed also at GIF++)
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
20
Difluroetano
C4H10
CAS 75-28-5
C2H4F2
CAS 75-37-6
Cloropentafluoroethane
C2ClF5
Pentafluoroethane CF3CHF2
Propane C3H8
R 600a
R152a
CAS 76-15-3
CAS 354-33-6
CAS 74-98-6
R 125
R290
Tetrafluoroethane
CH2FCF3
CAS 811-97-2
Diclorotrifluoroethane
C2HCl2F3
CAS 306-83-
Sulphur hexafluoride SF6
R 7146
HFO-1234yf
1,3,3,3-tetrafluoropropene CAS 29118-24-9
1-Chloro-3,3,3-trifluoropropene
CAS 2314-97-8
R134a
R123
CAS 2551-62-4
3,3,3-tetrafluoropropene CAS 754-12-1
Methane, trifluoroiodo-
R 115
HFO-1234ze
HFO-1233zd
R13I1
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
RPC standard gases and their candidate ecoreplacements
Isobutane
21
First results on new gas mixtures for RPCs
Gas mixtures tested:
Ar/C4H10/TP 83-3-15
with increasing % of SF6
Preliminary
Ref: B.Liberti et al, RPC2014 Beijing
TFP has a strong effect both in quenching
and in keeping the charge at low level
mixtures are promising even for avalanche
working mode with an appropriate FEE and a
dedicated chamber layout
A long R&D program is needed to
analyze all the proposed gases and
variants
First with cosmics, then at GIF
Single-gap ATLAS prototype, read on the
oscilloscope, average charge vs. efficiency
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
22
The Quest for ecogases: ATLAS Tor Vergata lab
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
23
The Quest for ecogases: CMS Frascati lab
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
24
The Quest for Ecogases
characterizing interaction of candidate ecogases with RPC materials
•
•
•
•
•
Chemistry
Reactivity
Outgassing
Production of HF ?
Production of other contaminants?
– Ex.: CF3I under discharge releases CF3 strong acid and
corrosive
• R&D on optical sensor for gas contaminants (see
spares)
• Before and after irradiation
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
25
The Quest for Ecogas
characterizing interaction of candidate ecogases with RPC materials
manalysis setup at CMS Frascati and associates (Sapienza
Ingegneria Materiali, ENEA, Politecnico Torino)
•
•
•
•
•
•
GasCromatograph-Mass Spectrometer
Scanning Electron Microscope - EDS
X-Ray Diffractrometry
Fourier Transform Infra Red Spectroscopy
Chemistry Lab
Optical sensors for RPC
1.
2.
•
Gas mixtures for RPC
1.
2.
3.
4.
•
M.Caponero et al., Use of fiber op4c technology for rela4ve humidity monitoring in RPC detectors JINST 8 (2013) T03003
S.Grassini et al., Gas monitoring in RPC by means of non-‐invasive plasma-‐coated POF sensors JINST 7 (2012) P12006
S.Colafranceschi et al., A study of gas contaminants and interac4on with materials in RPC closed loop systems JINST 8 (2013) T03008
S.Colafranceschi et al., Performance of the Gas Gain Monitoring system of the CMS RPC muon detector and effec4ve working point fine tuning INST
7 (2012) P12004
L.Benussi et al., A New approach in modeling the response of RPC detectors Nucl.Instrum.Meth. A661 (2012) S182-‐ S185
L.Benussi et al, Study of gas purifiers for the CMS RPC detector Nucl.Instrum.Meth. A661 (2012) S241-‐S244
Materials for gaseous detectors
1.
G.Saviano et al., A study of film and foil materials for the GEM detector proposed for the CMS muon system upgrade accepted by JINST (2014)
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
26
5. Irradiation tests
• Test di aging su rivelatori e materiali………..
• Test di aging e single event effect dell’elettronica
di FE, test con fasci (BTF a Frascati, etc) delle
prestazioni (rate, efficienza, risoluzione
temporale, sensitivita’ a fotoni e neutroni) dei
prototipi iRPC. Questi test sono fondamentali sia
per il front-end presente che per quello futuro.
Tutte le schede elettroniche attualmente
installate dovranno essere verificate fino a 10
anni di HL-LHC.
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
27
Single Event Effects study on the FE boards of the
improved RPC
(2015-2017)
•
Motivations: study of radiation transient effects
on the FE electronics of the iRPC
•
Study : cross section measurement of the
transient fenomena induced by neutrons on
the open input FE boards. We plan to use the
following facilities: the Triga Mark II reactor in
Pavia and the Louvain cyclotron. The first one
covers a energy range till 18MeV which can be
extended till 50MeV by the second one.
•
Setup : a measurement station has been
already assembled and used for previous tests.
The station has been instrumented with : VME
crate, LVoltage PS , VME scalers, NIM crate and
NIM modules, PC.
•
Additional costs to be addressed:
–
irradiation and targets for flux measurement at
Triga Mark II  4kEuro
–
irradiation and transport costs for Louvain 
7kEuro
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
28
6. New trigger electronics (ATLAS)
The current system is not compatible with the Phase-2 trigger requests
- 2 trigger levels (L0 + L1)
- minimum 500 kHz L0 rate, minimum 200 kHz L1 rate
- 6 µs L0 latency, 30 µs L1 latency
- use of GBT system for the distribution of the LHC timing signals
- readout system based on Felix
The current on-detector electronics will be replaced with the new DCT boxes (Data
Collector Transmitter, about 800 in total)
- use of FPGAs instead of ASICs for the on-detector electronics
- the DCT box will collect RPC front-end data, and perform some simple logic before
sending the data off-detector
Most of the trigger logic will be located in the off-detector (USA15) new Sector Logic
boards (64 in total):
- increased algorithm flexibility, easier operations and maintenance, no radiation
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
29
New trigger scheme
on-detector
208
readout data
GBT fibres
DCT
control data
Init/control PC
416
GBT fibres
DCT
416
RPC2
Felix
RPC3
off-detector
2
trigger data
Sector Logic
64
1 per crate
trigger fibres
RPC1
208
RPC0
DCT
to MuCTPi / CTP
to ethernet switch / ROD
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
30
R&D: new trigger electronics
Additional trigger logic with respect to the current one is being defined:
- Increased trigger coverage could be feasible by changing the trigger algorithm (and
possibly by adding new RPCs in the inner barrel layer)
- Increased steepness of the trigger turn-on curve could be feasible thanks to the
improved spatial resolution
- Muon charge info could be added to the trigger data
- Trigger thresholds could be fully programmable and more flexible (possibly > 6)
Interest in the project expressed by the INFN groups
- Bologna, Napoli, Roma, Roma Tor Vergata (about 10 physicists, 4 FTE)
R&D:
- 2 commercial FPGA evaluation boards (3 k€ ciascuna)
- 2 adapter boards (1 k€ ciascuna)
- 1 prototype (5 k€)
Total R&D: 13 k€ (2015: 6 k€ - 2016: 2 k€ - 2017: 5 k€)
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
31
Financial Requests (2015-2017)
ATLAS/CMS
ATLAS/CMS
CMS
CMS
ATLAS
ATLAS
keuro
comments
keuro
comments
keuro
comments
ITEM
TASK
Electrode
Tot
233
35
23
HPL
20
development low Res thin (10) and Proto (10)
Glass
Transportation
10
5
from company to Lab
10
58
production resistivity and long term conductivity
Chamb/Proto
Resistivity Meas
Tot
Thin/multi Gap
Chamber prod.
35
scaling from small to full size
Multiplet mech. frame
Gas comp. & distrib.
8
Consumable
15
Tot
56
Chip prototype
45
GIF++, BTF, etc
5
for CMS and ATLAS exp.
11
36
Single Event Effects
Gas
20
unit cost 2 Keuro
equipment
4
flowmeters
10
chemical materials and sensors
Tot
48
Electronics
12
RPC user gas system
10
Cables and sensors
Gas use
4
12
8
2
Trolley and support
8
ATLAS layout prototype
13
5
chip/DAQ board
13
0
0
0
0
On chamber LVL1 Roma 1
2
interaction w/ materials
Running test consumable
CMS layout prototype
Chip design and development
Test in lab
Tot
Consumable
8
4 precision frame for 4 chambers + local gas distrib syst
4
design and test of new gas I & T
Adaptor board
Eco-gas
2 chambers
8
prototype -1
Front-end
21
10
DAQ/DCS epool rent
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
32
Funding profile (temptative)
Task
2015
2016
2017
TOTALE
Electrode
15
20
0
35
Chamb/Proto
10
28
20
58
Front-end
20
25
20
56
Eco-gas
16
10
10
36
GIF++
20
14
14
48
81
97
64
233
Advance in 2014: ……TBD
Milestones
Electrode
Chamber/Proto
Front-end
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
Ecogas
33
Personnel
• ATLAS RPC ……….. 4 FTE
–
–
–
–
Bologna
Roma 1
Roma 2
Napoli
• CMS RPC ………….. 5 FTE
–
–
–
–
Bari (Abbrescia, Iaselli, Maggi, Pugliese)
Frascati (Benussi, Bianco, Piccolo, Saviano)
Napoli (Buontempo, Paolucci, Thiessen)
Pavia
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
34
spares
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
35
The Quest for Ecogas
characterizing interaction of candidate ecogases with RPC materials
• Optical sensors for gas contaminants
• Developed for HF detection and tested at GIF
• S.Grassini M.Parvis L.Benussi S.Bianco
D.Piccolo, Gas monitoring in RPC by means of
non-invasive plasma-coated POF sensors JINST
7 (2012) P12006
• Simple, optical, compact, inexpensive
• Test and optimize for ecogases
• Develop compact and inexpensive standalone
readout
• If successful, study deployment
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
36
HPL: R&D relativo alla produzione di lastre di HPL a bassa resistività. Obiettivo è il
raggiungimento di un valore di resistività inferiore di un ordine di grandezza rispetto
a quello attualmente utilizzato (1÷6 x 1010 Ohm cm).
Questo R&D è di interese comune ATLAS-CMS ma sarà seguito da CMS che ha
studiato e contribuito allo sviluppo della produzione di HPL per RE4 con una nuova
ditta di laminati (Puricelli) dopo la chiusura della ditta Panpla che aveva prodotto
tutto l’ HPL per gli RPC degli esperimenti a LHC. La misura di resistività sarà fatta da
CMS mentre il test della long term conductivity da ATLAS
Tot
HPL
Transportation
Resistivity Meas
35
20
5
10
• Acquisto di un batch di HPL (1 batch= 80 lastre da 1.6 m x 3.2 ;) . Questo quantitativo è
sufficiente per un certo numero di prototipi da 1mq per entrambi gli esperimenti e per
circa 5 prototipi0 (fulls size) per ogni esperimento : 8 kEuro
• Sperimentazione bassa resistività presso la ditta Puricelli : 12 kEuro (basato su circa 50
test )
• Misure di resistività: costruzione di uno strumento portatile per la misura di resistività
(alimentatore,adc,elettrovalvole, consumables) 7 keuro
• Test di long term conductivity sull’HPL : 3 keuto
• Trasporti: le lastre saranno tagliate presso una ditta milanese e inviate alla GT per la
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
37
costruzione
dei prototipi: 5 keuro