trinchero

Test of large area glass RPC at the DANE Test Beam Facility (BTF): 

Test of large area glass RPC at the DANE Test Beam Facility (BTF)   S. Calcaterra1 , R. De Sangro1, D. Gamba4,6,G. Mannocchi1,5 , P. Patteri1 P. Picchi1,4, M. Piccolo1 ,S. Ragazzi2,3 ,N. Redaelli2, L. Satta1,7, T. Tabarelli de Fatis2, A. Tonazzo8 , P. Trapani4,6, G.C. Trinchero5,6 . 1 INFN, Laboratori Nazionali di Frascati, Frascati, Italy; 2 INFN, Sezione di Milano, Milano, Italy; 3Università di Milano Bicocca, Milano, Italy; 4Università di Torino,Torino, Italy; 5CNR, IFSI Sezione di Torino, Torino, Italy; 6INFN, Sezione di Torino, Torino, Italy; 7Università di Roma, Dipartimento di Energetica,Roma, Italy; 8Università di Roma 3,Roma, Italy;  

Outlook: 

Outlook Introduction New Glass Rpc prototypes DANE Test Beam Facility (BTF) Results of tests at BTF Results of cosmic ray measurements Conclusion

CaPiRe R&D Program: 

CaPiRe R&D Program To establish industrial procedures to produce large areas of glass RPC detector ( Cheap Mass Prodution) To develop a new detector design, overcoming the previous detector limitations (i.e. LNGS Glass RPC size) (Large area RPCs, New Design) To study and possibly import standard glass industry techniques . (More Producers) To look for materials and operating conditions in order to have good efficiency up to particle intensities of ~10 Hz/cm2 Test Facility at LNF (BTF)

Glass Spark Counter GSC: 

Glass Spark Counter GSC RPC with electrodes made of standard float glass instead of Bakelite with a completely different design approach developed at LNGS. (see C.Gustavino et al. NIMA 457, 558 (2001) ) End caps by injection moulding Noryl Envelope Thermoplastic soldering for gas sealing Float Glass Synthetic coating Spacers by injection moulding (2 mm) Easy and fast and cheap construction

Silk Screen Printing: 

Silk Screen Printing silk screen printed electrode A remarkable improvement has been obtained introducing new acrilyc resistive paints and silk screen printing techniques for RPC resistive electrodes production Up to 1000 m2/day G.C. Trinchero, A. Giuliano, P.Picchi, Nucl. Instr. and Meth. A 508 (2003) 102 M.Ambrosio et al. Nucl. Instr. and Meth. A 508 (2003) 98.

New Glass RPC prototypes : 

New Glass RPC prototypes 1 RPC 60x60 4 RPC 100x100 cm2 2mm gap 2mm glass (rv=3-5 x 1012 Wcm@ 25 ºC) Materials and production techniques similar to Bakelite RPCS

Test Beam Facility @LNF: 

Test Beam Facility @LNF Energy 25-550 Mev (e+) 25800 Mev (e-) Max repetion rate 50 Hz Pulse duration1-10 ns Current/pulse 1-1010 particles RPC efficiency and “ageing” maps

Beam Test Facility : 

Beam Test Facility 242 mm/ch σbeam ~2 mm

BTF Hall: 

BTF Hall

Test @ BTF: 

Test @ BTF Scintillator 4+1 RPCs Calorimeter beam 3 cm strips 8 strip=1 ADC ch

Analog Read-out: 

Analog Read-out Ar/C2H2F4/i-C4H10=48/48/4

Efficiency Plateau I: 

Efficiency Plateau I Ar/C2H2F4/i-C4H10=48/48/4 fbeam=2Hz (1 500 MeV e-) 493_defocus σbeam  20 mm T=25°C GT1 and GT2 HV on just from 1 day I ~2.5 μA/m2 @ 7800 V

Efficiency Plateau I: 

Efficiency Plateau I Ar/C2H2F4/i-C4H10=48/48/4 GT1 and GT2 HV on just from 1 day I ~2.5 μA/m2 @ 7800 V fbeam=2Hz (1 500 MeV e-) σbeam  20 mm T=25°C

Efficiency Plateau II: 

Efficiency Plateau II Ar/C2H2F4/i-C4H10=48/48/4 I ~3 μA/m2 @ 8200 V fbeam=1Hz (1 500MeV e-) σbeam  2 mm 493_focus ~ 2 Hz/cm2 T=25°C

Efficiency Plateau II: 

Efficiency Plateau II Ar/C2H2F4/i-C4H10=48/48/4 I ~3 μA/m2 @ 8200 V fbeam=1Hz (1 500MeV e-) σbeam  2 mm ~ 2 Hz/cm2 T=25°C

Efficiency vs Rate : 

Efficiency vs Rate Ar/C2H2F4/i-C4H10=48/48/4 I ~2 μA/m2 @ 7800V σbeam  20 mm HV =7800 V 1 500MeV e-

Efficiency vs Rate : 

Efficiency vs Rate Ar/C2H2F4/i-C4H10=48/48/4 I ~3 μA/m2 @ 8200V σbeam 2 mm 1 500MeV e- HV =7800 V before background subtraction

Efficiency vs Rate : 

Efficiency vs Rate Ar/C2H2F4/i-C4H10=48/48/4 I ~2 μA/m2 @ 7800V σbeam 2 mm 1 500MeV e- HV =7800 V

Efficiency vs Rate : 

Efficiency vs Rate Ar/C2H2F4/i-C4H10=48/48/4 σbeam 2 mm HV =8200 V σbeam  20 mm HV =7800 V

Cosmic ray @LNF: 

Cosmic ray @LNF Efficiency map 1x1 cm2 1x1 m2 glass rpc (GT1). 1 strip not connected HV=7700 V Ar/C2H2F4/i-C4H10=48/48/4 Hits within 2 cm from the fitted muon track ε>85 %

Cosmic ray @LNF: 

Cosmic ray @LNF Efficiency map projection along x an y 1x1 m2 glass rpc (GT2) HV=7700 V Ar/C2H2F4/i-C4H10=48/48/4 Hits within 2 cm form the fitted muon track

Stability vs Time : 

Stability vs Time 7/9/2003 8000V 9/6/2003 7700 V CH#5 60x60 cm2 Riferimento (bakel.) GT-1

Singles Counting Rate: 

Singles Counting Rate CH#5 60x60 cm2 Ar/C2H2F4/i-C4H10=48/48/4

Long term stability Tests@ Mi-Bicocca: 

Long term stability Tests @ Mi-Bicocca HV=7800 V Ar/C2H2F4/i-C4H10=46/46/8

Bubbling the gas through Ammonia: 

Bubbling the gas through Ammonia NH3 (25%) + Ar (20 vol.) NH3 (25%)+ standard gas mix. (12 vol./24h) 48 h with dry gas NH3 (25%)+ standard gas mix. (24vol./48h) 24 h with dry gas HV=7800 V Ar/C2H2F4/i-C4H10=46/46/8 H.Sakai et al. NIM A484,153 C.Gustavino et al, this conference

Efficiency Plateau: 

Efficiency Plateau

Efficiency Plateau II: 

Efficiency Plateau II

New RPC production: 

New RPC production First 2 RPC out of 20 HV on since 11/10/2003 Screen printed resistive coating 14/10/2003 13/10/2003

New RPC production: 

New RPC production First 2 RPC out of 20 HV on since 11/10/2003 HV=7700 V 14/10/2003 14/10/2003 13/10/2003 13/10/2003

New RPC production: 

New RPC production First 2 RPC out of 20 HV on since 11/10/2003 Screen printed resistive coating 14/10/2003 14/10/2003 13/10/2003 13/10/2003

Conclusions: 

Conclusions As a first step in the way to set a new detector design, we produced our glass RPC detectors (1 m2) exploiting standard procedures, materials and production techniques simply using 2 mm glass electrodes instead of the bakelite ones. Results of measurements at DANE Test Beam Facility (BTF) and with cosmic rays are quite good. More work has to be done to fully understand (and improve) the detector performances Detector Design optimization Production of larger number of detectors

Test @ Mi Bicocca: 

Test @ Mi Bicocca