tile and fibre measurements (tile hcal) j. cvach, s. němeček institute of physics as cr, prague...
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![Page 1: Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague (Calice Coll.) 1.Tile uniformity, current measurements](https://reader035.vdocuments.mx/reader035/viewer/2022070306/55178a3e5503460e6e8b5748/html5/thumbnails/1.jpg)
Tile and fibre measurements (Tile HCAL)
J. Cvach, S. Němeček Institute of Physics AS CR, Prague (Calice Coll.)
1. Tile uniformity, current measurements
2. Cosmics monitor
3. Comparisons
4. Conclusions
![Page 2: Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague (Calice Coll.) 1.Tile uniformity, current measurements](https://reader035.vdocuments.mx/reader035/viewer/2022070306/55178a3e5503460e6e8b5748/html5/thumbnails/2.jpg)
ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 2
![Page 3: Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague (Calice Coll.) 1.Tile uniformity, current measurements](https://reader035.vdocuments.mx/reader035/viewer/2022070306/55178a3e5503460e6e8b5748/html5/thumbnails/3.jpg)
ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 3
1. Tile uniformity with source measurement
• Our setup consists of light tight box + PM Hamamatsu R5505 at 2 kV + Keithley 6514 electrometer+ 90Sr (~ 1.5 MBq) radioactive sourcehas a fixed grid for uniformity measurements:
- multiples of 4 mm in x direction- 10 mm in y direction
• Uniformity = / <I> calculated over area smaller by ~10 mm than tile size (due to the source profile),
– STD of one meas.• Different tile sizes: Bicron bc908 tiles 5x5, 10x10, 15x15 cm2
(read by fiber bc91A mc, 0.8 mm thick): • Different grooves, tile size 5x5 cm2, Kuraray SCSN81
- middle, edge, diagonal groove- 1 and 2 circular grooves (read by fiber bc91A)
Result: no dependence of uniformity on tile size observed
![Page 4: Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague (Calice Coll.) 1.Tile uniformity, current measurements](https://reader035.vdocuments.mx/reader035/viewer/2022070306/55178a3e5503460e6e8b5748/html5/thumbnails/4.jpg)
ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 4
Setup for uniformity measurements
![Page 5: Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague (Calice Coll.) 1.Tile uniformity, current measurements](https://reader035.vdocuments.mx/reader035/viewer/2022070306/55178a3e5503460e6e8b5748/html5/thumbnails/5.jpg)
ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 5
Example: tile with middle groove0
0,8
1,6
2,4
3,2 4
4,8
5,6
6,4
0
1,5
3
4,5
6
0
4
8
12
16
20
24
28
32
36
res
po
ns
e t
o S
r90
x axis (cm)
y ax
is (
cm)
32-36
28-32
24-28
20-24
16-20
12-16
8-12
4-8
0-4
0
0,8
1,6
2,4
3,2 4
4,8
5,6
6,4
0
1,5
3
4,5
6
048
12162024
28
32
36
res
po
ns
e t
o S
r90
x axis (cm)
y ax
is (
cm)
fiber on side
fiber in groove
Groove effect not masked by source profile
PM
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ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 6
Summary for tile Kuraray SCSN81 5x5 cm2
2
4
6
8
10
12
20 30 40 50 60 70 80 90 100
PM current (nA)
un
ifo
rmit
y (
%)
mid groove
edge groove
diagonal groove
plain tile
1 loop 2 loops
Worse Corner
Best Corner
![Page 7: Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague (Calice Coll.) 1.Tile uniformity, current measurements](https://reader035.vdocuments.mx/reader035/viewer/2022070306/55178a3e5503460e6e8b5748/html5/thumbnails/7.jpg)
ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 7
Example: tiles bc408 - uniformity0
1,6
3,2
4,8
6,4
8
9,6
11,2
0
2
4
6
8 10
12
05
1015202530354045
50
55
60
65
res
po
ns
e t
o S
r90
x axis (cm) y axis (cm)
60-65
55-60
50-55
45-50
40-45
35-40
30-35
25-30
20-25
15-20
10-15
5-10
0-5
PM
10 x 10 cm2
Tile (cm2) 5 x 5 10 x 10 15 x 15
Uniformity (%) 4.0 – 6.0 5.0 – 6.5 4.0 – 5.5no dependence on size!
PM
15 x 15 cm2
01,63,
24,86,
4
89,611
,2
0
3
6
9
12
15
05
1015
20
25
30
35
40
45
50
res
po
ns
e t
o S
r90
x axis (cm)
y axis (cm)
fibre on side
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ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 8
Tile+fiber response to 90Sr – source in the tile centre
0
10
20
30
40
50
60
70
80
90
0,6 0,8 1
fibre thickness (mm)
PM
cu
rre
nt
(nA
) Y11(200)M
bc91A mc
bc91A
bc92 mc
Y11(200)M
bc91A mc
bc91A
bc92 mc
tile bc408
tile vladimir
fibre
![Page 9: Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague (Calice Coll.) 1.Tile uniformity, current measurements](https://reader035.vdocuments.mx/reader035/viewer/2022070306/55178a3e5503460e6e8b5748/html5/thumbnails/9.jpg)
ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 9
Tile+fibre response to 90Sr – cont.
0
10
20
30
40
50
60
70
80
90
0,6 0,8 1
fibre thickness (mm)
PM
cu
rre
nt
(nA
)
Y11(200)M
bc91A mc
tile kuraray
![Page 10: Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague (Calice Coll.) 1.Tile uniformity, current measurements](https://reader035.vdocuments.mx/reader035/viewer/2022070306/55178a3e5503460e6e8b5748/html5/thumbnails/10.jpg)
ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 10
2. Cosmics monitor
Two plastic scintillator bars, 50 cm long, 5*2 cm² ( detector : Up, Down)
– separated vertically by 2.5 cm thick Pb bar (larger Eμ for Coinc.) => ~Eloss of MIP
– read by PMTs EMI 9813 (d=46mm, 14 dynodes)
– connected by PMMA (Plexiglas) lightquide: 5*2 cm² => π*(2.3 cm) ²
Sliding Up detector the Test area L*5 cm ² is prepared:
– Three optically separated Scintillator tiles Bicron BC-408, 5*5 cm²
– Two optically separated Scintillator tiles Bicron BC-408, 15*15 cm²
– Read by PMTs HAMA H3165 (d=10mm, 10 dynodes)
μ
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ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 11
Cosmics monitor, DAQ
PULSER from Dual Timer CAEN, N93A
1
2
3
4
5
LRS 2249W
CAMAC to
PC by
KK 00950 Ohm
Gate
Left
Right Delay
Delay
Down
Up Delay
Delay
Linear FAN-OUT 428A
Pulser
LRS 645LRS 645
100 Hz
300 ns
LRS 623A
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J. Cvach: Tiles & fibres ... 12
Scintillator Tiles BICRON bc408 spectra
RightPMT
Left
PMT
μ
30%
29%
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J. Cvach: Tiles & fibres ... 13
Npe from left and right PM
Npe.: C * < Q(L+R)> ²
σ(L-R) ² - σ02
C = up to 1.25 to correct for statistical
fluctuations in the first few dynodes( C=1 used)
σ0 = Noise ( neglected)
E.H.Bellamy, ..,S.Tokar,..NIM A339(1994)468
CUT (L+R) > 6
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ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 14
Corespondance of LY and cosmics - bc408
• 3 tiles 5x5, 3 tiles 10x10, 2 tiles 15x15 cm2 used in cosmic measurements
• Light yield measured - Sr source in the middle of the tile
• 2 fibres Kuraray Y11(200), 1 mm with mirror on tile side, Tyvek, Alu reflect.
• Results per tile & fibre
Tile a x a (cm2) 5 x 5 10 x 10 15 x 15
LY (nA) 105 +- 6 60 +- 4 39 +- 6
Relative LY 2.4 +- 0.4 1.5 +- 0.3 1
Photo e- 6.5+-0.4 *) 4 +- 0.2 2.5 +- 0.2
LY / photo e- (nA) 16 +- 1.7 15 +- 1.4 16 +- 2.8
• approximate ‘scaling’ 1/a observed in ATLAS collaboration• our normalization factor = 16 nA/ photo e- • *) cf. to 6.57 given in S. Reiche, Diploma thesis, Hamburg 2001
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ECFA-DESY, St. Malo 13/04/02
J. Cvach: Tiles & fibres ... 15
Comparison of LY measurements
• DESY – effort made to have collimated Sr source, hand device ( )
• Prague – Sr source with divergence of ~ 45o, semiautomatic device, grid 10 mm x 4 mm ( )
• each data sample normalized to its max value
y = -20 mm
0
0,2
0,4
0,6
0,8
1
1,2
-30 -20 -10 0 10 20 30
x (mm)
y = 0 mm
0
0,2
0,4
0,6
0,8
1
1,2
-30 -20 -10 0 10 20 30
x (mm)
y = 20 mm
0
0,2
0,4
0,6
0,8
1
1,2
-30 -20 -10 0 10 20 30
x (mm)
PRG – fibre on side
PRG fibre end
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J. Cvach: Tiles & fibres ... 16
LY comparison - comments
• DESY subtracts correction ~ 6-10 % which is x dependent, not y dependent
• PRG no corrections, background dark current < 2% and not x, y dependent
• PRG: tile position in coordinate system known to +- 2 mm for x, y
• DESY: tiles in Tyvek, mirrored fibre end
• PRG: tiles in white paper, fibre end cut and not mirrored
• PRG: LY increases toward fibre end
• DESY measurements: smaller decrease towards tile edges – collimated source
• DESY meas: symmetric in x, understanding of x dependent correction?
• --> DESY measurement: better uniformity
• PRG: try to collimate source or unfold the source profile
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J. Cvach: Tiles & fibres ... 17
Comparison
• measurement of attenuation length for bc408 scintillator (Kuraray Y11 fibre)
• left: S. Reiche, Diploma thesis, bc408 (box), Kuraray SCSN (triangle), 5x5cm2
• right: this talk, bc408, 15x15 cm2
Measurements consistent: drop ~ 6% at 4 cm
relative LY, bc408, 15x15 cm2
0,84
0,88
0,92
0,96
1
1,04
0 2 4 6 8 10 12 14 16
y (cm)
x=2,4 cm
x=7,2 cm
x=11,2 cm
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J. Cvach: Tiles & fibres ... 18
4. Conclusions
• Measurements with radioactive source and cosmic muons provide consistent results
• Cosmic muon measurements confirm assumption from TDR about Npe
• Uniformity of different tile geometries/sizes < 7 %
• Comparison of measurements from different labs important
• Simulation needed to better understand measurements/ improve design
• Fiber on tile side is a recommended option but fiber in circular groove gives 3x larger LY (option for larger tiles?)