CELLS RESPONSE OF DIFFERENT COATING/WRAPPING ALEXANDRE DYCHKANT 1/12/2019 ALEXANDRE DYCHKANT NICADD/NIU

ALEXANDRE DYCHKANT NICADD/NIU 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. 1/12/2019 ALEXANDRE DYCHKANT NICADD/NIU

ALEXANDRE DYCHKANT NICADD/NIU 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. 1/12/2019 ALEXANDRE DYCHKANT NICADD/NIU

ALEXANDRE DYCHKANT NICADD/NIU 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. 1/12/2019 ALEXANDRE DYCHKANT NICADD/NIU

ALEXANDRE DYCHKANT NICADD/NIU FIGURE 1. A FULL SET OF MEASEREMENTS FOR EACH CELL 1/12/2019 ALEXANDRE DYCHKANT NICADD/NIU

TABLE 1. A CELL RESPONSE AS A PMT OUTPUT CURRENT [nA] 1/12/2019 ALEXANDRE DYCHKANT NICADD/NIU

ALEXANDRE DYCHKANT NICADD/NIU 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. 1/12/2019 ALEXANDRE DYCHKANT NICADD/NIU