CELLS RESPONSE OF DIFFERENT COATING/WRAPPING

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CELLS RESPONSE OF DIFFERENT COATING/WRAPPING
ALEXANDRE DYCHKANT
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INTRODUCTION
THE REASON FOR CARRYING OUT THESE
MEASUREMENTS WERE THE LACK OF DATA ON RESPONSE OF
A SMALL SCINTILLATING CELL WITH POLISHED EDGES
COMPARE TO THE RESPONSE OF CELL WITH
NON-POLISHED OR JUST MACHINING EDGES AND HOW ARE
THESE RESPONSES SENSITIVE TO A DIFFERENT KIND OF
WRAPPING OR COATING MATERIALS. THE RESULTS
OF RESPONSE MEASUREMENTS FOR CELLS WITH
DIFFERENT QUALITY OF EDGE SURFACE ARE REPORTED.
IN ADDITION RESPONSES OF CELL WRAPPED IN DIFFEREN
MATERIALS, INCLUDDING SUPERREFLACTIVE 3M FILM,
WILL BE PROVIDED. WE NEED THESE DATA FOR
THE DESIGN OF SCINTILLATING DIGITAL
HADRONIC CALORIMETER FOR THE SMALL DETECTOR ON
THE FUTURE ELECTRON-POSITRON LINEAR COLLIDER.
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GEOMETRY, MATERIALS, AND TOOLS 1
CELL MATERIAL SCINTILLATOR
BC408, THICKNESS 5
MM, SHAPE HEXAGON,
LENGTH OF SIDES- 19
MM, AREA- 9.4 CM²,
5 CELLS HAVE EDGES
FINISHED WITH FLY DIMOND TECHNIQUE,
ALL TOTAL-11 CEELS.

GROOVE SIGMA SHAPE,
RADIUS 12 MM,
25º OF CIRCLE WITHOUT GROOVE,
RECTANGULAR CROSSECTION,
DEPTH 4 MM,
WIDTH 1 MM,
DEPTH TAPERRED TO EXIT.
WLS FIBER BCF92,
SQUARE SHAPE,
SIDE 0.8 MM, LENGTH- 1 M,
FINISHED ENDS WITH
FLY DIMOND TECHNIQUE, ONE END
MIRRORED, EMBEDDED AND GLUED INTO
THE GROOVE USING BC600.
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GEOMETRY, MATERIALS, AND TOOLS 2
WRAPPING MATERIALS TYVEK, 3M
RADIANT COLOR FILM CM500, 3M
RADIANT COLOR FILM CM590, 3M
RADIANT MIRROR FILM VM2002,
ALUMINIZED MYLAR, TITANIUM WHITE
ACRYLIC PAINT FROM LIQUITEX ENGLAND,
(ALUMINUM FOIL).
RADIOACTIVE SOURCE Sr90 2 mC.
PHOTOMULTIPLIER TUBE HAMAMATSU R580,
HIGH VOLTAGE 1300 V,
DARK CURRENT LESS THAN 0.07 nA.
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FIGURE 1. A FULL SET OF MEASEREMENTS FOR EACH
CELL
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TABLE 1. A CELL RESPONSE AS A PMT OUTPUT
CURRENT nA
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IN CONCLUSION
FIRST, WE DO NOT NEED TO SPEND MONEY, TIME, AND
MAN POWER FOR POLISHING CELL EDGES
BECAUSE FINISHED SURFACE REDUCED A
CELL RESPONSE. FURTHER, A PAINTED CELL PROVIDES
2/3 RESPONSE OF CELL WRAPPED IN
TYVEK. FINELY, THE 3M SUPERREFLECTIVE FILM
VM2002 PROVIDES THE BRIGHTEST
RESPONSE.