1. ATLAS/CMS RPC R&D for phase-2
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014

2. 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

3. 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 could 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

4. Barrel trigger coverage
LVL1 barrel
High-Pt trigger acceptance currently limited at ~72%
(only in barrel!) due to non-instrumented regions in:
feet + elevators (partial recovery in LS1)
toroid (and ribs) in BM chambers of small sectors
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

5. Barrel trigger coverage
Single muon MC study
for different trigger options
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%
current trigger logic
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014

6. 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
- 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

7. 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

8. CMS RPC phase-2 proposal
Two types of upgrades proposed for the CMS RPC muon system:
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.
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
Technical Proposal in progress
due July 2014
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014

9. RE3/1 & RE4/1 Propose to cover the very forward region
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 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: fb-1
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014

10. CMS RPC in muon reconstruction
Recovery of efficiency thanks to RPC tracking
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

11. 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

12. Joint ATLAS-CMS phase 2 R&D CMS-specific
Operation at 1-2kHz/cm2, 1-2
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

13. 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

14. Test di long term conductivity sull’HPL : 3 keuto
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 35
HPL 20
Transportation 5
Resistivity Meas 10
TRADURRE E CONDENSARE
O SPARES
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 costruzione dei prototipi: 5 keuro
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014

15. 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 final module -1 prototypes that fits all the specific requirements of the two experiments.
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 experiments)
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

16. 3. High performance FEE Prototype developed by R.Cardarelli
Test on standard CMS chamber
Prototype developed by R.Cardarelli
Tests on 2mm gaps
CMS
turn-on efficiency curve shifted by ~460V
ATLAS
comparison in lab with the ATLAS FE
at the same efficiency: x7 reduced charge;
fully efficient up to 7 kHz/cm2 at GIF
Preliminary
results
Test in ATLAS laboratory
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

17. 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

18. from Si-amplifier and SiGe-amplifier
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

19. Cost estimation
The project aims to realize, as a multi-project at Europractice, 40 full-custom circuits with 8 channels each
The steps are:
design+test of the analog circuit: 1 melting run, kE
design+test of the analog+digital circuit: 1 melting run, 50 kE
optimizationof the analog+digital circuit: 1 melting run, 50 kE
production of 40 prototypes: 1 melting run, kE
The first three steps already funded by other projects. The funding request is for the production of the prototypes to be used in the R&D
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014

20. 4. The Quest for ecogases Ref: CMS Technical Proposal (July 2014)
The European Community has limited the industrial 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

21. 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

22. RPC standard gases and their candidate ecoreplacements
Isobutane C4H CAS R 600a
Difluroetano C2H4F CAS R152a
Cloropentafluoroethane C2ClF CAS R 115
Pentafluoroethane CF3CHF CAS R 125
Propane C3H CAS R290
Tetrafluoroethane CH2FCF CAS R134a
Diclorotrifluoroethane C2HCl2F CAS R123
Sulphur hexafluoride SF6 CAS R 7146
3,3,3-tetrafluoropropene CAS HFO-1234yf
1,3,3,3-tetrafluoropropene CAS HFO-1234ze
1-Chloro-3,3,3-trifluoropropene HFO-1233zd
Methane, trifluoroiodo CAS R13I1
RPC standard gases and their candidate ecoreplacements
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014

23. First results on new gas mixtures for RPCs
Gas mixtures tested:
Ar/C4H10/TP
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

24. The Quest for ecogases: ATLAS Tor Vergata / CMS Frascati labs
TIME&CHARGE
WAVEFORM
12 RPC IN CR TELESCOPE
AND T, H CONTROLLED HUT
2 independent gas mix lines
for event-by-event comparison
digitizer
2 independent
gas mixing lines
Plot adc charge distrib
VME adc+tdc
gaschromatograph
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 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

26. 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
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
Gas mixtures for RPC
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
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

27. 5. Irradiation tests Test di aging su rivelatori e materiali………..
RIDURRE
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

28. 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

29. 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

30. New trigger scheme on-detector off-detector Felix DCT RPC3 RPC2 RPC1
1 per crate
Sector Logic 64
GBT fibres
Init/control PC
readout data
trigger data
to MuCTPi / CTP
to ethernet switch / ROD
control data
416 2
on-detector
off-detector
RPC0
DCT
208
trigger fibres
Felix
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014 30

31. 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€ : 2 k€ : 5 k€)
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014 31

32. Financial Requests (2015-2017)
ATLAS/CMS
CMS
ATLAS
keuro
comments
ITEM
TASK
233 23 21
Electrode
Tot 35 10
HPL 20
development low Res thin (10) and Proto (10)
Glass
2 chambers
Transportation 5
from company to Lab
Resistivity Meas
production resistivity and long term conductivity
Chamb/Proto 58 8
Thin/multi Gap
Chamber prod.
scaling from small to full size
Multiplet mech. frame 4
precision frame for 4 chambers + local gas distrib syst
Gas comp. & distrib.
design and test of new gas I & T
prototype -1
CMS layout prototype
ATLAS layout prototype
Consumable 15
Front-end 56 13
Chip prototype 45
Chip design and development
Adaptor board
for CMS and ATLAS exp.
chip/DAQ board
On chamber LVL1 Roma 1
Test in lab 11
Single Event Effects
Eco-gas 36
Gas
unit cost 2 Keuro 2
equipment
flowmeters
interaction w/ materials
chemical materials and sensors
GIF++, BTF, etc 48
Electronics 12
DAQ/DCS epool rent
RPC user gas system
Cables and sensors
Gas use
Running test consumable
Trolley and support
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014

33. Funding profile (temptative)
Task
2015
2016
2017
TOTALE
Electrode 15 20 35
Chamb/Proto 10 28 58
Front-end 25 56
Eco-gas 16 36
GIF++ 14 48 81 97 64
233
Advance in 2014: ……TBD
Milestones (provo ad abbozzare …):
31/12/2015 produce N electrodes of low resistivity HPL
31/12/2015 build N small size test chambers
30/06/2016 produce the 40 prototype circuits
31/12/2016 test prototype at GIF++
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014

34. Personnel ATLAS RPC ……….. 4 FTE CMS RPC ………….. 5 FTE Bologna Roma 1
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

35. spares
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014

36. 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

37. Test di long term conductivity sull’HPL : 3 keuto
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 35
HPL 20
Transportation 5
Resistivity Meas 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 costruzione dei prototipi: 5 keuro
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014