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ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague.

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Presentation on theme: "ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague."— Presentation transcript:

1 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Tile and fibre measurements (Tile HCAL) J. Cvach, S. Němeček Institute of Physics AS CR, Prague (Calice Coll.) 1.Cosmics monitor 2.Tile uniformity, current measurements 3.Tiles for DESY beam tests 4.DESY tiles re-measured at PRAHA 5.Summary

2 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... 1.Cosmics monitor Two plastic scintillator bars, 50 cm long, 5*2 cm ² ( detector : Up, Down) – separated vertically by 2.5 cm thick Pb bar (larger E μ for Coinc.) => ~E loss of MIP – read by PMTs EMI 9813 (d=46mm, 14 dynodes) – connected by PMMA (Plexiglas) lightquide: 5*2 cm ² => 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

3 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Cosmic Monitor at FZU, Prague PM-Box

4 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Cosmic monitor at FZU, Praha DAQ 1 2 3 4 5 LRS 2249W CAMAC to PC by KK 009 50 Ohm Gate LEFT RIGHT Delay Down Up Delay Linear FAN-OUT 428A Pulser LRS 645 100 Hz 160 ns LRS 623A 7 6 Right Delay Left Pulser from Dual Timer CAEN, N93A Delay = 100 ns

5 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Scintillator Tiles BICRON BC408 spectra Right PMT Left PMT μ 30% 29%

6 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... N pe from left and right PM response N pe.: C * ² σ(L-R) ² - σ 0 2 C = up to 1.25 to correct for statistical fluctuations in the first few dynodes ( C=1 used) σ 0 = Noise ( neglected) E.H.Bellamy,..,S.Tokar,..NIM A339(1994)468 CUT (L+R) > 6

7 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Summary Table of High Statistics measurements Corrections applied to “15cm” : 1.Two instead of three tiles*1.5 2.1 of 4 fibers w/o mirror*1.125 Corrections applied to “10cm” : 4 of 6 fibers w/o mirror *1.33

8 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Interim conclusions Attenuation length WLS fiber Kuraray Y11(200)mc was measured to be (203 +- 13) cm Usage of Tyvek and WLS fibers with mirror increased amount of collected light by factor > 2, Npe =13 per BC-408 tile, 5*5 cm 2 with two WLS Y11 d=1mm fibers Amount of light collected along the scintillator tiles by WLS fiber decrease with increasing tile size “a” almost like 1/a

9 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres...

10 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... 2. Tile uniformity with source measurement Our setup consists of light tight box + PM Hamamatsu R5505 at 2 kV + Keithley 6514 electrometer + 90 Sr (~ 1.5 MBq) radioactive source has a fixed grid for uniformity measurements: - multiples of 4 mm in x direction - 10 mm in y direction Uniformity =  / calculated over area smaller by ~10 mm than tile size (due to the source profile),  – STD of one meas. Different tile sizes: Bicron BC408 tiles 5x5, 10x10, 15x15 cm 2 (read by fiber BC91A mc, 0.8 mm thick): Different grooves, tile size 5x5 cm 2, Kuraray SCSN81 - middle, edge, diagonal groove - 1 and 2 circular grooves (read by fiber BC91A) Result: no dependence of uniformity on tile size observed

11 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Setup for uniformity measurements

12 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Example: tile with middle groove fiber on side fiber in groove Groove effect not masked by source profile PM

13 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Summary for tile Kuraray SCSN81 5x5 cm 2 Worse Corner Best Corner

14 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Example: tiles BC408 - uniformity PM 10 x 10 cm 2 Tile (cm 2 ) 5 x 5 10 x 10 15 x 15 Uniformity (%)4.0 – 6.05.0 – 6.54.0 – 5.5 no dependence on size! PM 15 x 15 cm 2 fibre on side

15 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Tile+fiber response to 90 Sr – source in the tile centre

16 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Tile+fibre response to 90 Sr – cont.

17 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Correspondence of LY and cosmics - BC408 3 tiles 5x5, 3 tiles 10x10, 2 tiles 15x15 cm 2 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 (cm 2 ) 5 x 510 x 10 15 x 15 LY (nA)105 +- 660 +- 439 +- 6 Relative LY2.4 +- 0.41.5 +- 0.3 1 Photo e - 6.5+-0.4 *)4 +- 0.22.5 +- 0.2 LY / photo e - (nA)16 +- 1.715 +- 1.416 +- 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

18 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Comparison of LY measurements DESY – effort made to have collimated Sr source, hand device ( ) Prague – Sr source with divergence of ~ 45 o, semiautomatic device, grid 10 mm x 4 mm ( ) each data sample normalized to its max value PRG – fibre on side PRG fibre end

19 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... 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 –more symmetric in x = influence of second (non measured ) fibre left on tile side at Prague --> PRG: try to collimate source or unfold the source profile

20 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Comparison measurement of attenuation length for BC408 scintillator (Kuraray Y11 fibre) left: S. Reiche, Diploma thesis, BC408 (box), Kuraray SCSN (triangle), 5x5cm 2 right: this talk, BC408, 15x15 cm 2 Measurements consistent: drop ~ 6% at 4 cm

21 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... 3. Tiles for DESY beam tests prepared by Institute of Physics AS CR, Prague We got 27 tiles 5x5 cm 2, 0.5 cm, BC408 and Kuraray Y11 (200) fibre, 0.8, 1.0 mm. DESY  Prague – beginning of June 2002 plainmiddle groove 2 circular grooves No of tiles 999 Tiles furnished by fibres, wrapped into Tyvek, ‘french foil’, 3M (german foil) LY measured from Sr source: N. p.e.= LY current (nA) / 16 (nA) normalization constant from comparison cosmics to radioactive source measurements

22 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Results coverfibreNo. ph.e.tile no.comment Tyvek19.6+-0.501-046.6 p.e. in February french f.1 0.8 15.3 11.3+-1.2 05 06-07 3M foil0.87.7+-0.608-09STRANGE - investigations coverfibreno. ph.e.tile no. Tyvek0.810.4+-1.424-27 french f.0.812.9+-1.621-23 Plain tile, fibre on side Fibre glued in the groove Bicron glue Glueing necessary –fibre must be fixed in groove 2 remaining tiles had fibre damaged –> in Prague

23 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Results – cont. coverfibreno. ph.e.tile no.comment Tyvek16.1+0.311-12tiles 11-17 : Tyvekglued14.9+2.813-1715.0+-2.8 french f.glued5.318-19PROBLEM - investigations 1mm fibre Tiles 01-05, 11-17, 24,25,27 put in the beam on July 12 Fibre in tile 26 found broken. Back to Prague! 23 tiles at DESY for beam measurements!

24 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Discussion Fibre become fragile at tile entrance when glued in the groove. Modify the grove shape to have zero depth at the tile edge! No visible effect of glueing on LY Effect of “french” foil Foil increases LY: by a factor of 1.3 - (1.4)

25 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... Discussion - 2 Effect of groove - straight in middle: 10% effect compatible with 1 within errors - circular 2 loops: More p.e. found than with tiles + fibres from winter delivery 22 tiles 5x5 + 3 tiles 10x10 cm 2 (fibres on both sides) were prepared for Beam Tests at DESY

26 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... 4. DESY tiles re-measured at PRAHA DESY: Σ Left = 24 p.e. Σ Right = 21.7 p.e. Σ = 45.7 p.e. PRAHA: 3L + 3R = 46.8 p.e. ±1.4 p.e. Good agreement, but L.Y.only… –III-02 / XI-02 = 1.2 –47p.e./3*25p.e ~60%

27 ECFA-DESY, Praha 16/11/02 S. Nemecek: Tiles & fibres... 5. Summary Measurements with radioactive source and cosmic muons provide consistent results: –L.Y. for different scintillator types, different fiber shapes, different reflectors was measured –L.Y. dependence on tiles size was shown Uniformity of different tile geometries/sizes < 7 % Set of 22 different tiles was prepared at Prague to be measured on test beams at DESY Cosmic muon measurements at Prague was checked by reference tiles with 2 fibers on side prepared on October 2002 at DESY -> 1σ agreement, but only 60% of maximum L.Y. reached at summer Test beams

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