C.Gustavino, june 4th 2004, Hamburg

•XPC Status report•VETO status report•Glass RPC R&D

Outline:

C.Gustavino, june 4th 2004, Hamburg

XPC1 prototype realized and tested (october 2003)XPC mechanical structure: final firm choice (27-3-2004)(INFN approval still in progress)Mounting (structure):XPC1/2 SM1 september 2004 (20 d) XPC2-SM2 may 2005 (7 d) XPC1-SM2 june 2005 (10 d) RPC commissionedStrip commissionedInterconnecting card designed and commissionedMounting (RPC+strips):Details of layout under study Tendering for RPC mounting in progress

XPC Planes

C.Gustavino, june 4th 2004, Hamburg

“Floating” XPC Plane technical design

C.Gustavino, june 4th 2004, Hamburg

C.Gustavino, june 4th 2004, Hamburg

C.Gustavino, june 4th 2004, Hamburg

VETO mechanical structure: final firm choice (may 2004)(INFN approval still in progress)Mounting (structure):februray 2005 or begin of 2006Large Glass RPC under test Details of final layout under study

VETO system

C.Gustavino, june 4th 2004, Hamburg

A CB

A: Poor covering, no fake events from the iron structure, interference with the BMS mounting*, interference with BMS operation?B: good covering, fake events from the pillars no BMS interference.C: good covering, no fake events from the pillars, interference with the BMS mounting*, interference with BMS operation?

*No interference if the mounting is in 2006.

C.Gustavino, june 4th 2004, Hamburg

B solution layout

C.Gustavino, june 4th 2004, Hamburg

moveable structurefor RPC mountingwith footbridge

A 110 mm shiftis mandatory formounting with the footbridge…

C.Gustavino, june 4th 2004, Hamburg

Glass RPC: activity overview

C.Gustavino, june 4th 2004, Hamburg

The 128 glass RPC’s of the Trigger walls of the LNGS test facilityrepresent a real test scale (20% of VETO surface, 80% of equivalent underground life)

C.Gustavino, june 4th 2004, Hamburg

Radiation damaging test (~100 years of OPERA operation)has been performed at the Gamma Irradiation Facility @ CERNBy using a 137Cs source

C.Gustavino, june 4th 2004, Hamburg

Water vapor aging test: after the water damaging a full recovering of the efficiency has been achieved by ammonia flushing,

New coating (about 300 k

Glass RPC: technical details

Concave profile to prevent discharges

New frame

glueglass

Glass RPC: technical details

10 cm spacing leads to 253 buttons20 cm spacing leads to 60 buttons25 cm spacing leads to 24 buttons!!less manpower, higher efficiencyConstraint: tolerance < 20 microns

Gap uniformity

C.Gustavino, june 4th 2004, Hamburg

General Tecnica

G&A

ICRA

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

3500 3700 3900 4100 4300 4500

Veff [V]

Efficienza

EFFsecondogiornoEFFnonogiorno

General Tecnica•3 mm electrodes•1m x 0.50m

Efficiency after 2 days

Efficienza after 9 days

0

500

1000

1500

2000

2500

3400 3600 3800 4000 4200 4400

Veff [V]

RATE [Hz/m2]

day1day2day3Day9

ICRA•3 mm electrodes•0.60m x 0.60m

0.00

0.20

0.40

0.60

0.80

1.00

3600 3800 4000 4200 4400 4600Veff [V]

Efficienza

0

50

100

150

200

250

300

350

400

450

3600 3800 4000 4200 4400 4600

kV per piatto [V]

rate /m^2 [Hz]

rate primo giorno

rate secondo giorno

rate terzo giorno

rate quarto giornoday1day2day3day4

day1

ICRA VS GT

0

100

200

300

400

500

600

700

800

900

3600 3800 4000 4200 4400 4600

kV per piatto [V]

rate /m^2 [Hz]

Rivelatore GTICRA

0.000.100.200.300.400.500.600.700.800.901.00

3600 3800 4000 4200 4400 4600

Veff [V]

Efficienza

GTIcraICRAGT

1136 mm

2600 mm

200 mm

Glass RPC prototype(raw data, no conditioning, low statistic) First class bakelite RPC

Preliminary!