12-07-2007 S.Bianco CMS Frascati - Incontro Referee 1 L.Benussi, M.Bertani, S.Bianco,...

12-07-2007 S.Bianco CMS Frascati - Incontro Referee 1

L.Benussi, M.Bertani, S.Bianco, A.Brotzu,M.A.Caponero, S.Colafranceschi, D.Colonna , D.Donisi, F.L.Fabbri, F.Felli,

M.Giardoni,T.Greco, B.Ortenzi, M.Pallotta, A.Paolozzi, L.Passamonti,

D.Pierluigi, A.Russo, B.Ponzio, C.Pucci, G.Saviano

CMS FrascatiCMS Frascati


1. Sviluppo e realizzazione del Gas Gain Monitoring System S.Bianco on behalf of S.Bianco on behalf of the CMS RPC Collaboration, “The gas gain monitoring system for the CMS RPC detector”, IEEE06, San Diego (USA) the CMS RPC Collaboration, “The gas gain monitoring system for the CMS RPC detector”, IEEE06, San Diego (USA) http://arxiv.org/pdf/physics/0701014http://arxiv.org/pdf/physics/0701014..

• Sistema di 12 RPC 50cm x 50cm per il monitoring con cosmici delle variazioni del punto di lavoro dovute alle variazione nella composizione del gas e alla presenza di contaminanti. In un unico telescopio tre sottosistemi alimentati da fresh Mix, pre-Purifiers, post-Purifiers

• Il sistema e` funzionante ed in corso di commissioning a Frascati • Scrittura di programmi xDAQ e, successivamente, PVSS iniziata

(S.Colafranceschi)• La gas room @ SX5 non sara’ pronta prima di settembre 2007 -->

installiamo il sistema al Closed Loop dell’ISR, schedule:• 24 LUGLIO Inizio installazione elettronica, cavi, PC, derivazione gas etc• 3 SETTEMBRE trasporto sistema al CERN, installazione, inizio

commissioning• 31 DICEMBRE (milestone) sistema operativo al CERN

2. Studi del Closed Loop e test all’ISR M.Abbrescia et al., Proposal for a detailed study of Closed M.Abbrescia et al., Proposal for a detailed study of Closed Loop… Frascati Preprint LNF 06/27 (IR) available at Loop… Frascati Preprint LNF 06/27 (IR) available at http://www.lnf.infn.it/sis/preprint/

• Iniziata una campagna di studio del Closed Loop con prelievi sistematici di materiale dei filtri e di gas, e analisi chimiche a largo spettro. Risultati mostrano che le procedure di rigenerazione vanno capite meglio, e che va studiato il possibile rilascio di elementi dai filtri.

• In preparazione nuova serie di analisi chimiche piu` mirate• Test del Closed Loop attualmente operativo con poche camere di vecchia

produzione, nuove gaps attese a fine settembre. • Person power: laureando Frascati (luglio-agosto-settembre) + summer

student.• Installazione e commissioning, shifts• Studi di ageing delle RPC

Attivita` 2007 CMS FrascatiAttivita` 2007 CMS Frascati

http://www.lnf.infn.it/sis/preprint/






USC5UXC5

C2H

2F 4

/SF 6

/i-

C4H

10 /

H2O

Slow CtrlGC, p/T/RH/Ph

CMS

VENT

PU

RIF

IER

S

SGX Bldg

RPC TRIG2RPC TRIG1

RPC TRIG4RPC TRIG3

RPC PAD REF2RPC PAD REF1

RPC PAD MON6RPC PAD MON5

REFERENCE half wheel lines

VENT

VENT

RPC PAD MON4

RPC PAD MON3RPC PAD MON2RPC PAD MON1MONITOR

VENT

Gas Gain Monitor (conceptual designGas Gain Monitor (conceptual design))

VENT


CMS RPC preliminary

Positive pad

Positive pad

Negative pad

Negative pad

Gas gain monitoring Gas gain monitoring chamberschambersMonitoring della purezza del gas attraverso il controllo

del punto di lavoro di 12 piccole gaps 50cm x 50cm, doppio pad readout

knee

+2

00

-20

0

0.3%

SF 6

0.0%

SF 6

@ GT

@ Frascati, test in ambiente umidita` controllata

STREAMER AVALANCHE


Closed loop Studies Closed loop Studies SummarySummary

• Closed loop filters determined in 2001 at GIF Closed loop filters determined in 2001 at GIF by looking at GC peaksby looking at GC peaks

• Purifiers in CMS will need daily regeneration, Purifiers in CMS will need daily regeneration, optimize purifier materials is a mustoptimize purifier materials is a must

• Rigorous sampling of purifiers performed:Rigorous sampling of purifiers performed:– New materialsNew materials– Used materialsUsed materials– Regenerated materialsRegenerated materials

• A broad-spectrum analysis campaign A broad-spectrum analysis campaign (reference) to single out problems and to (reference) to single out problems and to design more focussed analyses.design more focussed analyses.

• Test ongoing now at ISR with 20 Double-gap Test ongoing now at ISR with 20 Double-gap RPC’s to characterize purifiersRPC’s to characterize purifiers


La rigenerazione non rimuove S e F dai filtriLa rigenerazione non rimuove S e F dai filtri

CMS PRELIMINARY

S F trend in Ni-Al Filter

S no fluxS flux S Ir fluxS regenr

F fluxF regener

S IR regener

0

0.05

0.1

0.15

0.2

Ni-Al

Ni Al filter

%

S no flux

S flux

S regenr

F no flux

F flux

F regener

S IR no flux

S Ir flux

S IR regener


Elementi in traccia nelle Elementi in traccia nelle bachelitibacheliti

Il gas riduce la presenza di Il gas riduce la presenza di metalli sulle bachelitimetalli sulle bacheliti

Trace Elements Trend (Oiled)

0

20

40

60

80

100

120

140

0 1 2 3

1(No Flux) 2 (Flux)

ppm

Cu

Ni

As

Br

Cr

Sb

CMS PRELIMINARY


Andamento di Cu Zn Pb Ni nelle Andamento di Cu Zn Pb Ni nelle zeolitizeoliti

La rigenerazione non rimuove i La rigenerazione non rimuove i metalli dalle zeolitimetalli dalle zeoliti

Zeolite trend pollutants

0

510

15

20

2530

35

0 1 2 3 4

1(Unused) 2(fluxed)3(Regenerated)

ppm

Cu

Ni

Pb

Zn

CMS PRELIMINARY


MOF-B richieste 2008MOF-B richieste 2008 Le richieste si riferiscono al sistema di gas gain monitoring descritto in [1], e alle analisi per lo Le richieste si riferiscono al sistema di gas gain monitoring descritto in [1], e alle analisi per lo

studio sistematico di filtri e gas del Closed Loopstudio sistematico di filtri e gas del Closed Loop

(rif.[2]) attualmente in corso all'ISR e vengono meglio dettagliate come segue:(rif.[2]) attualmente in corso all'ISR e vengono meglio dettagliate come segue:

1) ANALISI CHIMICHE ................ 6.0kEURO1) ANALISI CHIMICHE ................ 6.0kEURO

Analisi chimiche (INAA, Fluorescenza, ICP-MS) da effettuarsi esternamente a completamento della Analisi chimiche (INAA, Fluorescenza, ICP-MS) da effettuarsi esternamente a completamento della prima fase di caratterizzazione dei filtri [2]. Materiali di consumo e reagenti per il prima fase di caratterizzazione dei filtri [2]. Materiali di consumo e reagenti per il completamento dello studio delle caratteristiche dei filtri dopo il filtraggio e le operazioni di completamento dello studio delle caratteristiche dei filtri dopo il filtraggio e le operazioni di rigenerazione degli stessi da effettuarsi a cura del gruppo di Frascati.rigenerazione degli stessi da effettuarsi a cura del gruppo di Frascati.

2) POOL AFFITTO ELETTRONICA GAS GAIN MONITORING ........ 8.0kEURO2) POOL AFFITTO ELETTRONICA GAS GAIN MONITORING ........ 8.0kEURO

Elettronica di HV, LV, preamplificazione e logica di trigger per le camere del gas gain monitoring. Elettronica di HV, LV, preamplificazione e logica di trigger per le camere del gas gain monitoring. Si propone di mantenere nel 2008 il sistema finanziato a Frascati ed utilizzare affitto di Si propone di mantenere nel 2008 il sistema finanziato a Frascati ed utilizzare affitto di materiale per il sistema al CERN.materiale per il sistema al CERN.

3) SPARE PER GAS GAIN MONITORING ................. 7.0kEURO3) SPARE PER GAS GAIN MONITORING ................. 7.0kEURO

Acquisto di n.15 gaps 50cm*50cm come spare delle n.12 camere del gas gain monitoring. Gli spare Acquisto di n.15 gaps 50cm*50cm come spare delle n.12 camere del gas gain monitoring. Gli spare saranno realizzati nei primi mesi del 2008, approfittando delle ultime possibilita di produzione saranno realizzati nei primi mesi del 2008, approfittando delle ultime possibilita di produzione prima della chiusura degli impianti della General Tecnica. Il costo e` lo stesso sostenuto per l prima della chiusura degli impianti della General Tecnica. Il costo e` lo stesso sostenuto per l acquisto delle n.12 camere del sistema attualmente in uso.acquisto delle n.12 camere del sistema attualmente in uso.

• BIBLIOGRAFIABIBLIOGRAFIA

[1] M.Abbrescia et al., The Gas Gain monitoring system of CMS RPC, http://arxiv.org/pdf/physics/0701014[1] M.Abbrescia et al., The Gas Gain monitoring system of CMS RPC, http://arxiv.org/pdf/physics/0701014

[2] M.Abbrescia et al., Proposal for a Systematic Study of the CERN Closed Loop Gas System Used by the RPC Muon [2] M.Abbrescia et al., Proposal for a Systematic Study of the CERN Closed Loop Gas System Used by the RPC Muon Detectors in CMS, Frascati preprint LNF - 06 / 27(IR).Detectors in CMS, Frascati preprint LNF - 06 / 27(IR).


Papers 2006-2007Papers 2006-2007• Preprints and ConferencesPreprints and Conferences

– S.Bianco on behalf of the CMS RPC Collaboration, “The gas gain monitoring S.Bianco on behalf of the CMS RPC Collaboration, “The gas gain monitoring system for the CMS RPC detector”, IEEE06, San Diego (USA) system for the CMS RPC detector”, IEEE06, San Diego (USA) http://arxiv.org/pdf/physics/0701014http://arxiv.org/pdf/physics/0701014..

– C.Pucci “CMS RPC gas gain system”, Annual Congress of Italian Physical C.Pucci “CMS RPC gas gain system”, Annual Congress of Italian Physical Society, Torino 2006Society, Torino 2006

– D.Colonna “Use of FBG sensors for high precision silicon detectors”, D.Colonna “Use of FBG sensors for high precision silicon detectors”, Annual Congress of Italian Physical Society, Torino 2006Annual Congress of Italian Physical Society, Torino 2006

– M.Abbrescia et al., Proposal for a detailed study of Closed Loop… Frascati M.Abbrescia et al., Proposal for a detailed study of Closed Loop… Frascati Preprint LNF 06/27 (IR) available at Preprint LNF 06/27 (IR) available at http://www.http://www.lnflnf..infninfn.it/sis/preprint/.it/sis/preprint/

– M.Caponero et al., “On the use of FBG sensors in CMS” Siena conference M.Caponero et al., “On the use of FBG sensors in CMS” Siena conference on adv. Detectors Nov 2006 (to appear on NIM)on adv. Detectors Nov 2006 (to appear on NIM)

– A.Paolozzi et al., “Performances of FBG sensors for application at LHC A.Paolozzi et al., “Performances of FBG sensors for application at LHC experiments”, Vienna conference Feb 2007 (to appear on NIM)experiments”, Vienna conference Feb 2007 (to appear on NIM)

– S.Bianco et al., Omega-Like Fiber Bragg Grating Sensors as Position Monitoring S.Bianco et al., Omega-Like Fiber Bragg Grating Sensors as Position Monitoring Device: A Possible Pixel Position Detector in CMS? Frascati preprint LNF- 06/13(NT)Device: A Possible Pixel Position Detector in CMS? Frascati preprint LNF- 06/13(NT)

• Masters and PhD ThesesMasters and PhD Theses• C.Pucci Analisi dei materiali nelle RPC di CMS Frascati preprint C.Pucci Analisi dei materiali nelle RPC di CMS Frascati preprint LNF - 06 / LNF - 06 /

31(Thesis)31(Thesis)• D.Colonna Applicazione dei sensori FBG in HEP e nelle strutture Marzo 2007D.Colonna Applicazione dei sensori FBG in HEP e nelle strutture Marzo 2007







CMS Frascati Activity in CMS Frascati Activity in 20082008

• Commissioning, data takingCommissioning, data taking• Commissioning of gas gain monitoringCommissioning of gas gain monitoring• Study of closed loop at ISRStudy of closed loop at ISR• Physics studies: Channels with muon pairs (from Physics studies: Channels with muon pairs (from

J/psi, Upsilon(4s), ZJ/psi, Upsilon(4s), Z00), profiting of knowledge of ), profiting of knowledge of RPC and DT muon detectorsRPC and DT muon detectors

– Spectroscopy of Bc-->J/psi Spectroscopy of Bc-->J/psi , B--> , B--> • Primi pensieri su S-LHC (gems, thin gap rpc, etc)Primi pensieri su S-LHC (gems, thin gap rpc, etc)


CMS Frascati 2008CMS Frascati 2008

Ricercatori & Tecnologi Bertani 20%, Bianco 80% Caponero 50%, Colafranceschi 100% Donisi 100%, Fabbri 70%, Felli 100%,Giardoni 60%, Pallotta 30%, Paolozzi 30%,Piga 100%, Pucci 100%, Saviano 100%

TOT=9.4 FTE

TecniciOrtenzi 100%, Passamonti 20%Collaborano: B.Ponzio D.Pierluigi, A.Russo

LaureandiGreci


SPARE SLIDESSPARE SLIDES


SEM-EDS STUDY OF SEM-EDS STUDY OF IRRADIATED RPCsIRRADIATED RPCs

Anode

Cathode

We opened RPCs irradiated at the GIF and observed defects on the inner surfaces.

SEM image of a defect with two magnificationsSEM image of a defect with two magnifications

We performed SEM-EDS and XRD analyses on- and off-defect…


CLOSED LOOP GAS CLOSED LOOP GAS RECIRCULATIONRECIRCULATION

Purifiers are THE crucial component


• Resistive Plate Chambers (RPC) detectors are widely used in HEP experiments for muon detection and triggering at high-energy, high-luminosity hadron colliders, in astroparticle physics experiments for the detection of extended air showers, as well as in medical and imaging applications.• While gain and efficiency stability are always a must, in the case of RPC detectors in high-rate experiments which use freon-based gas mixtures, utmost care has to be paid also for the possible presence of gas contaminants.•The RPC detector of experiment CMS at the LHC proton collider (CERN, Switzerland) will employ a gas analysis and monitoring system for the online monitor of the freon-based gas mixture used.• The gas monitoring system is based on small RPC detectors whose working point (gain and efficiency) is continuously monitored online. The gas monitoring system is designed to provide fast and accurate determination of any shift in working point conditions.• Quantitative gas chemical analysis is then performed online by a complete system which includes gas-chromatography, pH sensors and contaminants (notably HF) detectors.

GAS STUDIESGAS STUDIES


Reference bakeliteReference bakelite

On-defectOn-defect

SEM / EDS analysis of defects SEM / EDS analysis of defects inside irradiated RPCinside irradiated RPC

Peaks of NaF

Peaks of defectsOn-defect

Na peak

Off-defect

F peak

•Presence of Na in defects from bakelite

•Preliminary XRD results show presence of

NaF. http://arxiv.org/pdf/physics/0701014

http://arxiv.org/pdf/physics/0701014..


CERN Closed Loop Gas SystemCERN Closed Loop Gas System

• We proposed to study presence of We proposed to study presence of contaminants and their type ofcontaminants and their type of accumulation in accumulation in the Closed Loop Gas system (same for CMS and the Closed Loop Gas system (same for CMS and ATLAS) ATLAS)

• Current values in ISR Test Chambers decrease Current values in ISR Test Chambers decrease as the gas circulation changes from a closed to as the gas circulation changes from a closed to an open loop an open loop

• We are coordinating a three-phase study of CLWe are coordinating a three-phase study of CL– Phase 1 September 06 - study contemporaneous to Phase 1 September 06 - study contemporaneous to

chamber testing. Limited by current values. chamber testing. Limited by current values. – Phase 2 March 07 - Dedicated testing of DG’s and Phase 2 March 07 - Dedicated testing of DG’s and

SG’sSG’s– Phase 3 ? - Dedicated testing at GIF possibly Phase 3 ? - Dedicated testing at GIF possibly

synergy with ATLASsynergy with ATLAS


CERN Closed Loop Gas CERN Closed Loop Gas systemsystem

• All system components should be All system components should be characterized:characterized:– Bakelite (all different types of bakelite)Bakelite (all different types of bakelite)– Zeolite (all different zeolite filters)Zeolite (all different zeolite filters)– Other filters based on Cu and Zn and oxidesOther filters based on Cu and Zn and oxides– Gas Gas

by means of a systematic sampling of the by means of a systematic sampling of the different parts during all of the system different parts during all of the system work phaseswork phases


Phase 1: ISR sampling Phase 1: ISR sampling September 2006September 2006

• Samples (unused, contaminated, Samples (unused, contaminated, regenerated) have been collected:regenerated) have been collected:– Purifiers:Purifiers:

• Zeolite Zeolite

• Ni AlNi Al22OO3;3;

• Cu, Cu ZnCu, Cu Zn

– Pipes CuPipes Cu– Neither oiled nor used bakeliteNeither oiled nor used bakelite– Unused bakelite oiled with graphite Unused bakelite oiled with graphite


Table of analyses Table of analyses


Zeolites characterization now used Zeolites characterization now used in CLin CL

Different zeolite filters have Different zeolite filters have been used : 3A, 5A. been used : 3A, 5A.

They differ in their grain size They differ in their grain size dimensions, framework pores dimensions, framework pores amplitude and chemical amplitude and chemical compositioncomposition

• 4A (4 4A (4 Å, Na)Å, Na)• 3A (3 Å, K)3A (3 Å, K)• 5A (5 Å, Ca)5A (5 Å, Ca)• Grain size distribution has Grain size distribution has

been been performedperformed on zeolite on zeolite filters :filters :

• 33ÅÅ (25 gr) (25 gr) 1,4 mm1,4 mm (8 gr) (8 gr) 1 mm1 mm (17 gr) (17 gr)• 55ÅÅ (25 gr) (25 gr) 2,8 mm2,8 mm (16 gr) (16 gr) 2 mm2 mm (9 gr) (9 gr)


Type A zeolitesType A zeolites• Framework of Framework of

Linde Type A Linde Type A zeolites zeolites

• 4A (4 4A (4 Å, Na)Å, Na)• 3A (3 Å, K)3A (3 Å, K)• 5A (5 Å, Ca)5A (5 Å, Ca)


Linde Type A zeolite Linde Type A zeolite (Na(Na9696(H(H22O)O)216216[Si[Si9696AlAl9696OO384384] ]

XRD performed at University of Rome “La Sapienza” on a sample of unused zeolite. On the right, the reference pattern for standard Linde Type A zeolite.

REFERENCE


RACKS LAYOUT IN SGX5RACKS LAYOUT IN SGX5

1112

1 and 1/2 racksFor gas gain monitor

Only gas, no electronics

Lateral accessMinimize signal cables lengths

Gas

qua

lity

her

e +

pip

ing,

valv

es,G

C ?


Integration of Gas Gain Monitoring gaps Integration of Gas Gain Monitoring gaps with the CERN gas systemwith the CERN gas system


GAIN MONITORING SYSTEMGAIN MONITORING SYSTEM

READOUT PAD

Foam


GAS GAIN MONITORING - DOUBLE GAS GAIN MONITORING - DOUBLE PAD READOUTPAD READOUTPads 45x45cm2 positive and negative

Sum pulseDEVELOPING DIFFERENTIAL AMPLIFICATION SCHEME

TO REDUCE COHERENT NOISE

Cosmic ray event triggered

by scintillation

counters hodoscope


Our FEE options under test Our FEE options under test 1/61/6

Type A0 - Type A0 - LM6172 LM6172 - Dual High Speed, Low Power, Low Distortion Voltage Feedback - Dual High Speed, Low Power, Low Distortion Voltage Feedback AmplifiersAmplifiers

Gain Bandwidth 100 MHzGain Bandwidth 100 MHz

Slew Rate 3000 Volts/usecSlew Rate 3000 Volts/usec

SupplyCurrent Per Channel 2.3 mASupplyCurrent Per Channel 2.3 mA

Supply Min 5.5 VoltSupply Min 5.5 Volt

Supply Max Supply Max 36 Volt36 Volt

Type A1 - Type A1 - Max 435 DMax 435 Differential, High Speed Op Ampifferential, High Speed Op Amp

Gain BandwidthGain Bandwidth 275 MHz275 MHz


SupplyCurrent Per Channel 18 mASupplyCurrent Per Channel 18 mA

Supply Min 5 VoltSupply Min 5 Volt

Supply Max 12 VoltSupply Max 12 Volt

Type A2 - Type A2 - LMH6550 LMH6550 Differential, High Speed Op AmpDifferential, High Speed Op Amp

Gain Bandwidth 400 MHzGain Bandwidth 400 MHz


SupplyCurrent Per Channel 20 mASupplyCurrent Per Channel 20 mA

Supply Min 5 VoltSupply Min 5 Volt

Supply Max Supply Max 12 Volt12 Volt

Out

Pad +

Pad -

TRASFORMATORI (Zero centrale)TRASFORMATORI (Zero centrale)

Tipo ATipo A

Ferrite Diametro 30mm spessore 6mFerrite Diametro 30mm spessore 6mmm

Tipo BTipo B

Ferrite Diametro 30mmFerrite Diametro 30mm spessore 12mmspessore 12mm

Tipo CTipo C

Miniatura diametro 6mm spessore 3mmMiniatura diametro 6mm spessore 3mm

Several amplification schemes are being explored. Even a simple passiveSeveral amplification schemes are being explored. Even a simple passive

sum of positive and negative pads and feeding to standard LRS612AMsum of positive and negative pads and feeding to standard LRS612AM ampliampli

improves the S/N ratio.improves the S/N ratio.


AMPLI OptionAMPLI Option

<-

PED

ESTA

L

CMS RPC preliminary

HV=9700V

Pad +

Pad -

Filtro PassaBanda 100KHz – 80MHz

OscilloscopioLecroy / Tektronix

10pF100uH

10nF 4uH

12-07-2007 S.Bianco CMS Frascati - Incontro Referee 1 L.Benussi, M.Bertani, S.Bianco,...

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Transcript of 12-07-2007 S.Bianco CMS Frascati - Incontro Referee 1 L.Benussi, M.Bertani, S.Bianco,...