SciFi Test Results

1
SciFi Test Results

• Zisis Papandreou
• SPARRO Group, Regina
• Hall D Collaboration Meeting
• Bloomington, Indiana
• November 1st, 2001

2
Objectives and Fiber Types

• Objectives
• Light collection efficiency (cladding)
• Scintillation light production (doping)
• Light attenuation coefficient
• Timing resolution

• Fibers Tested
• Kuraray SCSF-81
• Single-clad Batch 2000
• Single-clad Batch 2001
• Pol.Hi.Tech. 0046
• Single-clad
• Double-clad
• Bicron
• Prohibitively expensive

3
Experimental Setup
4
Cosmic Rays - Attenuation
Geometric Mean
L/R ADC
Distance from left (cm)
???? 321 cm 259cm
247cm
5
TRIUMF M11 Setup
100 MeV ???/e beam 20 kHz coincidence rate Beam
was 2x2 cm2 with 2 protons
6
Experimental Area
7
Particle ID
300
RF
0
TOF
8
Measurement Groups

• Group-1 (all fiber bundles)
• 10 cm length scans, 40-260 cm main runs
• Group-2 (Pol.Hi.Tech. Multi-clad)
• Vertical versus Horizontal orientation
  configuration dependence
• Group-3 (Pol.Hi.Tech. Multi-clad)
• Beam height scan alignment dependence
• Group-4 (Pol.Hi.Tech. Multi-clad)
• Forward/Reverse scan magnetic field dependence
• Group-5 (both Kuraray bundles)
• Double thickness thickness dependence

9
Attenuation Length
10
Attenuation Conclusions

• Kuraray 2000 and 2001 batches were consistent ?
  280cm
• Pol.Hi.Tech. Multi-clad ? 235cm
• Pol.Hi.Tech. Single-clad broken
• No dependence on configuration, beam height,
  magnetic field
• Numbers lower than KLOE (Kuraray 320cm)

11
Timing Resolution
? Pol.Hi.Tech. Single-clad broken
? Pol.Hi.Tech. Multi-clad
? Kuraray bundles
12
Configuration Dependence
?Vertical
?Horizontal (misaligned)
400ps/650ps 0.62
?Horizontal
13
Next to do

• Analysis
• Extract index of refraction
• Improve timing resolution in software
• Look at particle ID
• Compare results with cosmic ray tests
• Order Kuraray multi-clad fibers and test
• Repeat cosmic-ray measurements
• Begin prototype construction