1. Frontier Scintillation Detectors: Inorganic Scintillating Fibers
WP 21: SciFi
Frontier Scintillation Detectors: Inorganic Scintillating Fibers
R. Novotny – JLU Giessen, Germany
R&D program:
development of inorganic scintillating fibers for experiments in hadron physics
R. W. Novotny SiPM Workshop GSI, February 9, 2009

2. R & D fibers produced of inorganic scintillator materials
obvious advantages:
high sensitivity (hadronic & e.m.-probes)
high light yield
fast response
granularity
radiation hardness
but:
very new technology
limitations: geometry, materials, doping
presently no large scale production
R & D
R. W. Novotny SiPM Workshop GSI, February 9, 2009

3. the experimental goals
R. W. Novotny SiPM Workshop GSI, February 9, 2009

5. thermal shields, inside the RF coil
technology: micro-pulling-down technique (µPD)
crucible,
thermal shields, inside the RF coil
seed
fiber
R. W. Novotny SiPM Workshop GSI, February 9, 2009

6. technology: micro-pulling-down technique (µPD)
present Co.
pulling chamber
RF generator
weighting
device
control
crucibles for
crystal fiber pulling
R. W. Novotny SiPM Workshop GSI, February 9, 2009

7. YAG:Ce and LuAG:Ce fibers
achievements with the present technology
YAG
LuAG
YAG:Ce and LuAG:Ce fibers
0.3 –1.0 mmØ, L < 1m
LYSO:Ce
mmØ, L < 30cm
1 mmØ, L = 10 cm
3 mmØ, L = 7 cm
0.5 mmØ
R. W. Novotny SiPM Workshop GSI, February 9, 2009

8. light propagation under X-ray excitation
characterization and quality control
light propagation under X-ray excitation
normalized light yield
fiber length / cm
R. W. Novotny SiPM Workshop GSI, February 9, 2009

9. characterization and quality control
longitudinal distribution of Ce
fiber length / cm
Ce-concentration / ppm
R. W. Novotny SiPM Workshop GSI, February 9, 2009

10. mapping of the Ce-concentration via confocal microscopy
characterization and quality control
mapping of the Ce-concentration via confocal microscopy
-slice thickness: 0.1 mm
-excitation: Ar 488 nm
applied to samples of YAG and LuAG fibers
1 mm
t1 = 68 ns (17%)
t2 = 1,5 us (83%)
t1 = 61 ns (65%)
t2 = 500 ns (35%)
R. W. Novotny SiPM Workshop GSI, February 9, 2009

11. R&D SiPM improvement of technology
new materials and dopants
geometry (diameter, length, ...)
homogeneity
reproducibility
development of prototype detector systems
position sensitive beam monitor
high granularity, large light output, radiation hard
optimization of timing start detector
start and trigger detector
fibre grid sensitive to e.m. probes
timing and position reference for e.m. calorimeters
high resolution calorimetry
read-out of spaghetti like sampling calorimeter
position sensitive dosimeter at irradiation facility
cylindrical start detector for TPC
SiPM
R. W. Novotny SiPM Workshop GSI, February 9, 2009

12. first examples compact array, no cross-talk double-sided read-out
localization of
impact point
(511keV)
R. W. Novotny SiPM Workshop GSI, February 9, 2009