CMS RPC R&D for phase 2
Two types of upgrades proposed for
the CMS RPC muon system:
1. Aging and longevity: installed
in 2007, must continue to
operate without significant
degradation 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. Redundancy in the forward region: keep performance of trigger
and low pT threshold even at an increased luminosity
• 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
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RE3/1 & RE4/1
• Proposed to cover the
very forward region
(1.6< |h| <2.4)
– 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
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CMS RPC in muon reconstruction
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
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Joint ATLAS-CMS phase 2 R&D
CMS-specific
• Operation at 1-2kHz/cm2, 1-2 C/cm2 @3000fb1
• Improved time resolution (10-100)ps
– Background reduction
– Secondary vertices
• iRPC
– Large area, improved, multigap RPC
• 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
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1. Electrode
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
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2. Chamber prototypes
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
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3. FEE
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
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4. The Quest for Ecogas
• Qui lista candidati, piano misure, setups
disponibili a frascati e TV
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
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The Quest for Ecogas
characterizing interaction of candidates with RPC materials
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Chemistry
Reactivity
Outgassing
HF production
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
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Setup and refs for materials studies
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Op4cal sensors for RPC gas
–
M.Caponero et al., Use of fiber op4c technology for rela4ve humidity monitoring in RPC
detectors JINST 8 (2013) T03003
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S.Grassini et al., Gas monitoring in RPC by means of non-‐invasive plasma-‐coated POF
sensors JINST 7 (2012) P12006
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Patent deposit ZEOSENSORS (n. RM2011A000621 24/11/2011)
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Gas mixtures for RPC
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S.Colafranceschi et al., A study of gas contaminants and interac4on with materials in RPC
closed loop systems JINST 8 (2013) T03008
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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
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L.Benussi et al., A New approach in modeling the response of RPC detectors
Nucl.Instrum.Meth. A661 (2012) S182-‐ S185
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L.Benussi et al, Study of gas purifiers for the CMS RPC detector Nucl.Instrum.Meth. A661
(2012) S241-‐S244
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Materials for GEM
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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
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5. Irradiation tests
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
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Single Event Effects study on the FE boards of the
improved RPC
(2015-2017)
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Motivations: study of radiation transient effects
on the FE electronics of the iRPC
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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
spares
D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014
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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 resitività 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