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

CMS RPC R&D for phase 2Two 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• HZZ*2 , 4m m; Ht+ -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 2

RE3/1 & RE4/1

– 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

• Proposed to cover the very forward region (1.6< |h| <2.4)

D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014 3

CMS RPC in muon reconstruction

• Recovery of efficie

ncy

thanks to RPC tra

cking

D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014 4

Joint ATLAS-CMS phase 2 R&DCMS-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, 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 5

1. Electrode

D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014 6

2. Chamber prototypes

D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014 7

3. FEE

D.Boscherini for the ATLAS Coll. and S.Bianco for the CMS Coll. R&D RPC phase2 - Rome May 9th 2014 8

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 9

The Quest for Ecogascharacterizing interaction of candidates with RPC materials

• 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 10

Setup and refs for materials studies• 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• –  S.Grassini et al., Gas monitoring in RPC by means of non- invasive plasma- coated POF ‐ ‐

sensors JINST 7 (2012) P12006• –  Patent deposit ZEOSENSORS (n. RM2011A000621 24/11/2011)• •  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 GEM• –  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 11

5. Irradiation tests

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 13

spares

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 35HPL 20Transportation 5Resistivity 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