FNAL-NICADD NICADD extruded scintillator

Transcription

1 FERMILAB FNAL-NICADD NICADD extruded scintillator Presented by Victor Rykalin Rome 1, October 24 1

2 FNAL-NICADD EXTRUSION FACILITY POLYMER FEEDER POLYMER DRYER DOPANT FEEDER EXTRUDER MELT PUMP DIE OUTPUT: Scintillating pellets Scintillator bars CONVEYOR Line under nitrogen atmosphere: Drying under nitrogen Each piece of equipment is purged In-line continuous process: Less handling of raw materials Precise metering of feeders Twin-screw extruder (better mixing) Melt pump offers steady output Control instrumentation 2

3 Screw diameter Screw speed Drive power Height Weight Lifetime 44 mm 12 RPM 2 HP ~11 mm ~35 kg ~4 hours ZE 4A UTS Technical Data Output range 3-2kg/h 3

4 Simulation of the extrusion profiles 4

5 The projects on which we collaborate ALICE ECAL upgrade (~15 T of extruded plastic) DHCAL (~2 T) MINERVA ( ~1 T of extruded plastic) 21 5

6 Mechanical tolerances, 3 m of extrusion profile. Thickness 4.98±.3 mm 4 Thickness /-.3mm

7 Tolerances, continued. 6 Width /-.17mm y mayor... Width11.33±.17 mm 7

8 Die impact on the scintillator profile Rectangle, with or without hole to host 1.2 mm WLS fiber Triangle, with or without hole to host 1.2 or 1.5 mm WLS fiber Rectangle, with 1 holes, or without them, to host 1.2 mm WLS fibers 8

9 Possible shapes of the extrusion process MINERVA, D approach, gives very good coordinate resolution, die is at our disposal(base 3.3 cm, height 1.7cm) Calorimeter applications, the die is not currently available. K2K solution, the die is available(2cm*1cm) Imagination is limited by the fiber cost, the die is in our disposal(1cm*.5cm) 9

10 Light attenuation length(short component) Attenuation Length L=27.1 cm (No-Tyvek) Attenuation Length L=29.4 cm (Tyvek) 1

11 1. Samples are cut to the same size(2*.5*1 cm 3 ) 2. All edges are polished to the same level 3. Far end is painted black Light attenuation length 4. The samples are consecutively wrapped in the same Tyvek. Attenuation Length (Normalized) Signal Value (na) BC-44 (L2=63.7cm) K2K (L2=26.2 cm) FNAL/NICADD (L2=34.7 cm) Source Position (cm) 11

12 Different sizes and wrappings Type: Wrapping: End: Polished: L1 (Long): L2 (Short): FNAL (2x1 cm) Tyvek K2K (2x1 cm) Co-extrusion Black (Taped) No 46.3 cm 36.5 cm Black (Taped) No cm K2K (2x.5cm) Tyvek Black (Painted) Yes (All edges) 53.8 cm 26.2 FNAL (2x.5cm) Tyvek Black (Painted) Yes (All Edges) 44.6 cm 34.7 BC44 (2x.5cm) Tyvek Black (Painted) Yes (All Edges) 64.5cm

13 Light output BC48 ADC counts 2.7 ±.25 F-NICADD 2.1 ±.3 Kuraray SCSN ±.21 Samples 2*2 cm 2 16 Ru Normalized to the thickness of 1 mm 5 mm extruded scintillator thickness, extruded hole,1.2 mm Y11 fiber, 1 cm out of scintillator, MRS readout ~ 17 PE LED signal 12 1 Events ADC counts 13

14 Light output 5 mm extruded scintillator thickness, extruded hole,1.2 mm Y11 fiber, 1 cm out of scintillator, MRS readout ~ 17 PE 14

15 Light output (MRS Readout, 1*1 mm 2 ) WLS FIBER DIAMETER [MM] SCINTILLATOR THICKNESS [MM] RESPONSE [PE] 1.(hole+glue) (hole+glue) (hole+glue) (groove+glue)

16 Basics MRS 16

17 17

18 General introduction Spectral response range 42-1 nm Peak sensitivity wavelength 67 nm (MRS) ε (67 nm) 23 % Operating voltage Volts Dark current ~ 2 µa Capacitance ~25 pf Gain ~5*1 6 Time response ~ 1-2 ns Time resolution < 3 ps Price (~1 ) expect ~ $1/ch Price (1-5 ) really ~ $ 8/ch 18

19 Tested PC board + MRS Counts 8 Counts Counts ACD Channe ls ACD Channe ls 75 Counts ACD Channe ls ACD Channe ls 1 Counts ACD Channels 1 75 Co unts ACD Channe ls Counts ACD Channe ls 19

20 Light yield uniformity response RESPONSE OF EXTRUDED STRIP ACROSS THE TWO HOLES AT 7 CM LY non-uniformity σ ~ 4 % NICADD (1 cm) VALUE OF RESPONSE, na POSITION OF Sr-9, MM PMT 2

21 Light yield uniformity response LY non-uniformity σ ~ 2.2 % for F-NICADD (1*1 cm 2 ) σ ~ 2.3 % (1*1 cm 2 SCSN-81) NOMALIZED RESPONSE LY non-uniformity < 3 % for 9 cm 2 HEX. Cell for DHCAL POSITION OF Sr-9, MM 21

22 FNAL-NICADD extruded scintillator, Transmittance and Fluorescence before irradiation 1% PPO +.3% POPOP Transmittance (%) Fluorescence Wavelength (nm) 22

23 Radiation hardness FNAL-NICADD extruded scintillator, 18 samples of 2*2 cm 2, Irradiation in air and annealing in air during 85 days, 9KGy/h). Dose absorbed γ, 6 Co Before Irradiation (ADC counts) After irradiation and anneal (ADC counts ) Light yield loss.5 Mrad 264± ±7.7 (5KGy) 1 Mrad (1KGy) 273± ±7.1 5 % 23

24 Transmittance 8 FNAL/NICADD SCINTILLATOR 7 6 Transmittance (%) Bef. Irrad. After Irrad. After 85-day air anneal Wavelength (nm) 24

25 Brief summary of the FNAL-NICADD extruded scintillator characteristics. Thickness: σ ~.6 % (Over 3 m) Width : σ ~.2 % (Over 3 m) LY non-uniformity σ ~ 4 % (across 1 cm ) LY non-uniformity σ ~ 2.2 % (1*1 cm 2 ) LY non-uniformity ~ 3 % (Hexagonal cell 9 cm 2 ) Light Yield 66 % of BC48 ~1% of Kuraray SCSN-81 Rad. Hardness < 5 % LY degradation after 1 Mrad (gamma) 25