NEW CELLS RESPONSES

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NEW CELLS RESPONSES
ALEXANDRE DYCHKANT, PETER TORRES
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GEOMETRY OF CELLS
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IMPORTANT DETAILS

• CUTTED CELL SIDES WERE NOT POLISHED
• A SQUARE SHAPE, 0.8 MM SIDE, AND 1 M LENGTH BCF92
  WLS FIBER
• WITH MIRRORED END WAS GLUED INSIDE THE TAPERED
  CELL
• GROOVE USING AN EJ-200 OPTICAL GLUE
• A 1.2 MM WIDE CELL GROOVE HAS A SIGMA SHAPE WITH
  RADIUS
• 12 MM FOR CEELS WITH AREA 9 CM² AND RADIUS 11
  MM FOR
• CELLS WITH AREA 6 CM²
• 2 mC Sr90 RADIOACTIVE SOURCE, HAMAMATSU PMT R580,
  AND
• KEITHLEY PICOAMMETER WERE USED.

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RATIO OF CELL RESPONSES AFTER/BEFOR GLUING
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RESPONSE OF CELLS IN nA
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AVERAGE RESPONSE FOR 2 PAINTED LAYERS 0.65
0.04 AVERAGE RESPONSE FOR 6 PAINTED LAYERS 0.75
0.04 AVERAGE RESPONSE FOR 10 PAINTED LAYERS
0.87 0.05
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RATIO OF PAINTED TO WRAPPED IN TYVEK CELL
RESPONSES VS AMOUNT OF PAINTED LAYERS
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COMENTS
THERE WERE EIGHT FIBERS WHICH WERE REPLACED BEFOR
GLUING BECAUSE OF MULTIPLE CRACKS THE RED
NUMBERS IN THE TABLE (SLIDE 5) ARE THE CELL
RESPONSES, WHICH HAVE FIBERS WITH CRACKS THE
VISUAL INSPECTION WITH RED LASER CONFIRMED
THIS ACTUALLY ONLY BLUE NUMBERS IN THE TABLE
(SLIDE 5) PROVIDE A NORMAL RESPONSES, HEXAGONAL
SHAPED, 5 MM THICKNESS, AND 9.4 CM² AREA CELLS
GIVE THE BEST RESPONSE THE VERY WIDE SPREADE OF
RESPONSES IS THE RESULTE OF MULTIPLE CRACKS OF
FIBER CLADING AND MAYBE OPTICAL GLUE.
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BICRON GLUE BC-600 VS ELJEN EJ-500
EIGHT SQUARE CELLS WITH 9.4 CM² AREA AND
DIAGONAL HOLL WERE MADE FROM 5 MM THIKNESS
NICADD EXTRUDED SCINTILLATOR, 0.94 MM OUTER
DIAMETER, 57 CM LONG KURARAY Y-11 WLS FIBERS
WITH MIRRORED END WERE GLUED INSIDE CELLS
EXTRUDED HOLLS IT MEANS THAT FIBERS WERE NOT
BENT IT WAS TWO SETS OF FOUR CELLS FOR THE EACH
TYPE OF OPTICAL GLUE RADIOACTIVE SOURCE Sr90
AND HAMAMATSU PMT R580 WERE USED THE AVERAGE
RESPONSE FOR BC-600 WAS 692.7 nA THE AVERAGE
RESPONSE FOR EJ-500 WAS 692.9 nA. EJ-500
PROVIDED THE SAME RESPONSE AS BC-600, BUT LESS
COST.
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SUMMARY
ELJEN TECHNOLOGY OPTICAL GLUE EJ-500 PROVIDES THE
SAME RESPONSE AS BICRON OPTICAL GLUE
BC-600 WHIGHT PAINTED CELLS PROVIDE 12 LESS
RESPONSE THAN CELLS WRAPPED IN TYVEK CELLS
WITH 9 CM² AREA PROVIDE THE SAME RESPONSES FOR
DIFFERENT SHAPE OR THICKNESS. WLS BCF92 SQUARE
FIBER WITH 0.8 MM SIDE MAY CREATE CRACKS INSIDE
THE CELL SIGMA GROOVE WITH 12 MM BANDING
RADIUS. THESE CRACKS CAN SIGNIFICANTLY REDUCE AND
MAKE UNSTABLE THE CELL RESPOND.