endcap crystal properties
DESCRIPTION
Endcap Crystal Properties. David Britton, Imperial College, February 2002. ACCOS Data for the 2001 crystals (2369-2467). Precision NUF Measurements. Data from 18 of the 2001 Crystals. Co 60 Source. Crystal. HPMT. Transmission Measurements. 4 Crystals setup for - PowerPoint PPT PresentationTRANSCRIPT
D.Britton, Imperial College
-0.015
-0.01
-0.005
0
0.005
0.01
0.015
-0.2 0 0.2 0.4 0.6 0.8 1 1.2
FNUF [%/X0]
Gra
dT
T
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
-0.2 0 0.2 0.4 0.6 0.8 1 1.2
FNUF [%/X0]
RN
UF
[%
/X0
]Endcap Crystal Properties
David Britton, Imperial College, February 2002
ACCOS Data for the2001 crystals (2369-2467)
D.Britton, Imperial College
Precision NUF Measurements
-500
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Photoelectrons
Co
un
ts
IC Data
Fit
Residuals
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
-0.25 0 0.25 0.5 0.75 1 1.25 1.5
FNUF
RN
UF
ACCOS DataICSTM Data
Data from18 of the 2001 Crystals
HPMT Co60 Source Crystal
D.Britton, Imperial College
Transmission Measurements
Integrating Sphere
Spectrometer (CCD array)
4 Crystals setup forLongitudinal measurement
Xe Lamp beam
35
37
39
41
43
45
0 40 80 120 160 200
Distance from small end [mm]
Tran
sver
se T
ran
smis
sio
n [
%]
Typical Transverse Transmission Curves at 350nm for two different crystals
“F-slope”
“R-slope”
D.Britton, Imperial College
R-Slopes Vs Wavelength
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
330 380 430 480 530 580 630 680
Wavelength [nm]
R-S
lop
e
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0.010
0.015
0.020
330 370 410 450 490 530 570 610 650 690
Wavelength [nm]
R-S
lop
e
Crystal 2386 (FNUF = 0.55%/X0)(Typical of normal FNUF crystals)
Crystal 2379 (FNUF = 1.03%/X0)(Typical of high FNUF crystals)
“GradRS”
D.Britton, Imperial College
Correlation between NUF and GradRS
-0.0008
-0.0006
-0.0004
-0.0002
0
0.0002
0.0004
0.0006
0.0008
-0.5 0 0.5 1
RNUF [%/X0]
Gra
dR
S
-0.0008
-0.0006
-0.0004
-0.0002
0
0.0002
0.0004
0.0006
0.0008
0 0.2 0.4 0.6 0.8 1
FNUF [%/X0]
Gra
dR
S
Conclusions
ACCOS light yield data are supported by higher precision measurements.
A correlation exists between FNUF and the transverse transmission (either the GradTT or GradRS parameters).
The anomalous FNUF crystals show a sudden change in the slope of the TT between 350nm and 380nm.