update on cms resistive plate chambers cms rpc barrel collaboration gr1, 5 aprile 2004

UPDATE ON

CMS RESISTIVE PLATE CHAMBERS

CMS RPC Barrel Collaboration

GR1 , 5 Aprile 2004

INFN Gruppo I Roma, 5 April 2004

INFN Gruppo I Roma, 5 April 2004 Introduction

Introduction CMS RPC group

CMS RPC group

GTHT

Bari

Pavia

Introduction

Sofia

All the sites are in operationAll the sites are in operation

CERN

Gap production on schedule Gap production on schedule

Chamber production delayed by 2.5 months

Chamber production delayed by 2.5 months

GIF activity is going on. Stop in June?GIF activity is going on. Stop in June?

SG productionSG production


INFN Gruppo I Roma, 5 April 2004 Single/Double Gap

Production and QC

Single/Double Gap Production and QC CMS RPC group

CMS RPC group

SG productionSG production



Production and QC


CMS RPC group

Gap production

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

2600

2800

3000

gen-02

mar-02

mag-02

lug-02

set-02

nov-02

gen-03

mar-03

mag-03

lug-03

set-03

nov-03

gen-04

mar-04

mag-04

lug-04

set-04

nov-04

gen-05

mar-05

mag-05

lug-05

set-05

nov-05

gen-06

data

# o

f g

ap

s

stopped20 gaps/week 25 gaps/week15 gaps/week

3% of rejected bigap 20% of rejected gapare included

= 4.5%

plannedproduced

DG productionDG production



Production and QC


CMS RPC group

bigap production

0

200

400

600

800

1000

1200

Jan-

02

Mar

-02

May

-02

Jul-0

2

Sep

-02

Nov

-02

Jan-

03

Mar

-03

May

-03

Jul-0

3

Sep

-03

Nov

-03

Jan-

04

Mar

-04

May

-04

Jul-0

4

Sep

-04

Nov

-04

Jan-

05

Mar

-05

May

-05

Jul-0

5

Sep

-05

Nov

-05

Jan-

06

data

# o

f b

iga

ps

10 bigaps/week8 bigaps/week6 bigaps/week

3% of rejected bigap are included

= 0.5%

plannedproduced

SG/DG productionSG/DG production



Production and QC


CMS RPC group

Overview on the full production

# 1629 SG produced until 20 March 2004overall rejection factor 17 %

# 457 DG produced until 20 March 2004 overall rejection factor 3.5 %

2004 production

Single gap rejection factor 10.7% ==> 70.2% overpressure test 10.6 % other 19.2 % high current

Chamber productionChamber production


INFN Gruppo I Roma, 5 April 2004 Chamber production

Chamber productionCMS RPC group

CMS RPC group

chamber production

0

50

100

150

200

250

300

350

400

450

500

gen-0

2

mar-

02

mag-0

2

lug-0

2

set-

02

nov-

02

gen-0

3

mar-

03

mag-0

3

lug-0

3

set-

03

nov-

03

gen-0

4

mar-

04

mag-0

4

lug-0

4

set-

04

nov-

04

gen-0

5

mar-

05

mag-0

5

lug-0

5

set-

05

nov-

05

gen-0

6

data

# o

f ch

am

be

rs

3 chambers/week 4 chambers/week 5 chambers/week

91 of the 160 chambers needed for december 2004 have been produced.

148 chambers done91 for the phase I

57 chambers of the next phaseshave been already produced

plannedproduced

160 chambers needed for phase I (dec of 2004)

20 RB1 have been modified and assembled twice. 20 RB3 to modify (now)

Gas circuit “T junction”Gas circuit “T junction”



Chamber production CMS RPC group

CMS RPC group

Some “T” on the gas circuit supplying the small gaps in the GIF were attachedby the HF.

These “T” are made by poly-acetylic resins

These components are used in the chamber gas circuit. However an inspection of the components present inside the RB1s in operation in the GIF has not showed any damage

The use of moistly mixtures can accelerate the deterioration





CMS RPC group

Produce a “custom T junction” in polycarbonate

A flux reducer has also been produced. It is needed to equalize the flux between the two gaps of a layer





CMS RPC group

Pre-production of the new “T junction” ready

Full production at the end of the month Total cost about 20 k €

Polycarbonate is extensively used inside the gap ( spacers, sealing frame)

Chamber assembly - HTChamber assembly - HT




CMS RPC group

HT in operation: # 46 chamber produced

Chamber test - PaviaChamber test - Pavia


INFN Gruppo I Roma, 5 April 2004 Chamber test

Chamber test CMS RPC group

CMS RPC group

• In operation since October 2003. # 27 RB1s tested

• Two kinds of trigger (small/ big)

• Transport logistic: the same track from Pavia > CERN >Naples> Pavia One week trip

• In operation since October 2003. # 27 RB1s tested

• Two kinds of trigger (small/ big)

• Transport logistic: the same track from Pavia > CERN >Naples> Pavia One week trip

More information available at:: http://lxpv01.pv.infn.it/~torre/testrpc/fatherframe.html

More information available at:: http://lxpv01.pv.infn.it/~torre/testrpc/fatherframe.html

http://lxpv01.pv.infn.it/~torre/testrpc/fatherframe.html




























CMS RPC group

Giorni tra Arrivo e Partenza

0

20

40

60

80

100

120

0 5 10 15 20 25 30

RPC

Gio

rni

SETUP A

B C





CMS RPC group

Trigger SMALLTrigger SMALL

Trigger Small (Forw e Back) Tutte le tipologie

0

2

4

6

8

10

12

14

16

95,5 96 96,5 97 97,5 98 98,5 99 99,5 99,9 100

Eff . (%)

RPC





CMS RPC group

Trigger Big (Forw e Back) tutte le tipologie

0

2

4

6

8

10

12

14

16

91 91.5 92 92.5 93 93.5 94 94.5 95 95.5 96 96.5 97 97.5 98 98.5 99 99.5 99.9 100

Eff . (%)

RPCTrigger BIGTrigger BIG

Chamber test - ResultsChamber test - Results




CMS RPC group

Chamber test - ResultsChamber test - Results




CMS RPC group

Distribuzione di Mean Cluster SizeDistribuzione di Mean Cluster Size

Distribuzione di Mean Cluster Size (muon)Distribuzione di Mean Cluster Size (muon)

ISR test activityISR test activity


INFN Gruppo I Roma, 5 April 2004 ISR test activity

ISR test activity CMS RPC group

CMS RPC group

Tests at ISR is increasingly requiring dedicated resources and manpower

A test trolley with 30 gas lines and 22 HV lines is in operation at CERN ISR

15 chambers can be fully read-out

A self trigger electronics will be soon installed to test cosmic rays performance

The gas system can provide up to 200 l/h flux with controlled humidity





CMS RPC group

86 chamber are at ISR on special stoking trolleys49 chambers have been tested: 44 accepted - 5 rejected





CMS RPC group

CH 102CH 102

Monitor the current stability vs time

a) Chamber with current/layer > 16 A are rejected

b) Chamber with a steady increasing of current are rejected





CMS RPC group

Monitor the current stability vs time

10 Chambers under test: LAYER UP 10 Chambers under test: LAYER DOWN

9.2 KV9.2 KV





CMS RPC group

•up•Down

-total

Current@9400 V Cluster_size@9400 V

Random trigger, 44 chambers

•Forw •Back•Middle-total





CMS RPC group

Average noise rate by cluster counting@9400V

•Forw •Back•Middle-total

Random trigger, 44 chambers





CMS RPC group

BWFW BW FW BW

RPC under test

Trigger RPCTrigger RPC

To TDCsTo TDCs andTrig. logic

To TDCs andTrig. logic

RPC-based TRIGGER System at ISRRPC-based TRIGGER System at ISR





CMS RPC group

The 8 modules are interconnected withI2C bus driven by the Slow Control Board

The 8 modules are interconnected withI2C bus driven by the Slow Control Board

• NIM Module

• Reads 6 FEB (1 bi-gap)

• I2C bus

• OR of 96 strips on NIM and LVDS

• Mask noisy channels

• 8 LVDS input OR

• Majority level selectable on the front panel

• NIM Trigger output

• NIM Veto input

• NIM Module

• Reads 6 FEB (1 bi-gap)

• I2C bus

• OR of 96 strips on NIM and LVDS

• Mask noisy channels

• 8 LVDS input OR

• Majority level selectable on the front panel

• NIM Trigger output

• NIM Veto input

Production scheduleProduction schedule


INFN Gruppo I Roma, 5 April 2004 Production schedule

Production schedule CMS RPC group

CMS RPC group

GIFGIF


INFN Gruppo I Roma, 5 April 2004 GIF

GIFCMS RPC group

CMS RPC group

Exchange rate: 1 volume/h

Humidity: ~50%

July 29th, 2003: start of operation at 50% recirculationNovember 4th, 2003: start of operation at 90% recirculationDecember 16th, 2004: start of operation at 95% recirculation

• understand the quality of the gas mixture • detect possible pollutants produced in the chambers• ascertain the efficacy of the filters

Exchange rate: 1 volume/h

Humidity: ~50%

July 29th, 2003: start of operation at 50% recirculationNovember 4th, 2003: start of operation at 90% recirculationDecember 16th, 2004: start of operation at 95% recirculation

• understand the quality of the gas mixture • detect possible pollutants produced in the chambers• ascertain the efficacy of the filters

3 filters used to trap HF: molecular sieve, 50% Copper, Nichel 3 filters used to trap HF: molecular sieve, 50% Copper, Nichel

GIFGIF



GIFGIF

CMS RPC groupCMS RPC group

Gas Chromatograph•Allows an immediate feedback on the gas, but low sensitivity•About 30 “useful” samples taken

Gas Chromatograph•Allows an immediate feedback on the gas, but low sensitivity•About 30 “useful” samples taken

“CERN” analysisA complex (takes much care) and long (about 8 hours in total) procedure to take samples; good sample quality, high sensitivity (up to 5 g/l), results after some time

“CERN” analysisA complex (takes much care) and long (about 8 hours in total) procedure to take samples; good sample quality, high sensitivity (up to 5 g/l), results after some time

Custom analysisUse the same procedure to take samples, allows a good (equally or more precise, i.e. ~ 0.1 p.p.m) cross check of the results of the previous method

Custom analysisUse the same procedure to take samples, allows a good (equally or more precise, i.e. ~ 0.1 p.p.m) cross check of the results of the previous method

GIFGIF


INFN Gruppo I Roma, 5 April 2004 GIF

GIFCMS RPC group

CMS RPC group

ConclusionConclusion


INFN Gruppo I Roma, 5 April 2004 Conclusion

Conclusion CMS RPC group

CMS RPC group

•Review and freeze the installation schedule with the DT group in Aachen (end April) (any change is expecially harmfull for RPC)

•Boost the chamber test rate in Bari and Pavia

•Open “SX5 commisioning” front

•Continue up to end June GIF activity. Then probably concentrate on ISR and SX5

•Review in May the budget situation

•Review and freeze the installation schedule with the DT group in Aachen (end April) (any change is expecially harmfull for RPC)

•Boost the chamber test rate in Bari and Pavia

•Open “SX5 commisioning” front

•Continue up to end June GIF activity. Then probably concentrate on ISR and SX5

•Review in May the budget situation

“Si sta come le foglie sugli alberi di autunno”

Non scuotete troppo l’albero, e speriamo che arrivi presto la primavera

“Si sta come le foglie sugli alberi di autunno”

Non scuotete troppo l’albero, e speriamo che arrivi presto la primavera

update on cms resistive plate chambers cms rpc barrel collaboration gr1, 5 aprile 2004

Documents

chamber production infn

schedule chamber production

qc cms rpc group slide

sg production infn gruppo

sgdg production infn

qc cms rpc group overview

singledouble gap production

chamber gas circuit