LXe Beam Test Result. CEX beam test 2004 Cryogenic Equipment Preparation Status Liquid Xenon Photon Detector Group. Charge Exchange Beam Test at piE5. New PMTs R9288TB higher QE and better performance under high BG Resolutions to be improved New calibration alpha sources
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LXe Beam Test Result
CEX beam test 2004
Cryogenic Equipment Preparation Status
Liquid Xenon Photon Detector Group
wire
LED
gamma
Eg
170o
q
Eg
Eg
p0
175o
q
54.9MeV
82.9MeV
1.3MeV for q>170o
0.3MeV for q>175o
Eg
H2 target+degrader
LYSO
Eff ~14%
NaI
LP
S1
Eff(S1xLP)~88%
beam
Optimization of degrader thickness
20mm + 3.3mm x n
Profile at S1, 2mm/bin
Analysis Result
Calibration
Energy
Timing
1st look on waveform Data
Wire (50 μm ϕ)
Alpha
40 μm
Po half-life=138 days
LXe
GXe
Nphe[0]
Nphe[0] for top-left alpha
with alpha emission angle selection
Center of the PMT-0
4 front sources
Applying the QEs determined in GXe (-75˚C)
Q.E. evaluation using alpha data in the liquid is also possible.
Higher light yield Expected better evaluation if xenon is pure!
R9288
R6041
Data #8528
normal gain
front 4 alphas
MC
reflection on quartz on
no absorption
scattering length :45cm for 175 nm
Energy Reconstruction
Cut-based Qsum Analysis
Linear Fit Analysis
Analyze only central events to compare with the previous result
|Xrec|, |Yrec|<2cm
70 MeV < ENaI+ELYSO < 105MeV
Sigma2 > 40 (discard events if shallow)
Sigma2: broadness of the event measured by using front face PMTs depth parameter
Cut-based Qsum analysis
83 MeV to Xe
55 MeV to Xe
Exenon[nph]
MC
Cut-based Qsum analysis
83MeV
55MeV
Before depth correction
78 %
After depth correction
with a linear function
Cut-based Qsum analysis
CEX 2004
CEX 2003
55 MeV
s=1.53%
FWHM = 4.5 ± 0.3
FWHM=4.8 %
83 MeV
s=1.16 ± 0.06%
FWHM = 5.0 ± 0.6
σ= 1.00±0.08 %
FWHM=5.2%
In general it is possible to obtain higher efficiency with the linear fit analysis
Linear Fit analysis
Y (cm)
Correlation with NaI/Lyso
83 MeV in LXe
55 MeV in LXe
X (cm)
Small displacement (~ 0.5 cm)
Linear Fit analysis
No selection, 600k events
NaI cut, 144k events
Black: Linear Fit
Red: QSUM
Linear Fit trained using MC including Fresnel reflection; used Q.E. determined with six sources. No large differences changing Q.E. set.
The Linear Fit works better.
NaI+sat cut, 83k events
NaI+sat+coll cut, 54k events
NaI cut: 70 MeV<QNAI<100 MeV
Coll. cut: (X2 + Y2)1/2< 4.75 cm
Linear Fit analysis
E (MeV)
E (MeV)
E (MeV)
No Need
Anymore
Red: all events; Green: no saturated
We observed a slight position dependence of the reconstructed
Energy.
It can be corrected by using a parabolic interpolation.
Z (cm)
Remove ADC saturated events
is equivalent to a depth cut.
Linear Fit analysis
83MeV
55MeV
Saturation &
NaI cut
FWHM = 5.6 %
Saturation &
NaI cut + R<1.5 cm
FWHM = 4.8 %
Correction (X&Y) effect 0.3 %
Timing Analysis
Intrinsic, L-R analysis
Absolute, Xe-LYSO
NaI
g
S1
g
LP
LYSO
tLP - tLYSO
p-
TL
i=r.m.s. of Ti
cut on Qi> 50 pe
Left
Right
g
TR
L-R analysis
Old data
New data
LYSO PMT1 & 2
Coorected for x-coord. (not for y)
Corrections applied fortime walk (negligible at high energy deposit)
LYSO
slit
slit
gamma
Xe- LYSO analysis
(TLYSO(R) -TLYSO(L))/2
s=64 psec
PMT1
PMT2
with 1cm slit
Xe- LYSO analysis
high gain
normal gain
103 psec
110 psec
55 MeV
Normal gain
High gain
1st look on the waveform data
LP Front Face
DRS0
DRS1
Xe(g)
τrise=7.0nsec
τdecay=35nsec
Xenon
Time constant
γ
α
Pulse height [mV]
Pulse shape discrimination
LYSO time resolution
Average
-160mV
-1200mV
-40mV
Npe1=2000phe Npe2=1000phe (3000phe is typical for 50MeV gamma)
ΔT=+30nsec
ΔT=+60nsec
ΔT=-30nsec
Npe1=2000phe Npe2=1000phe
Original
ΔT=-10nsec
ΔT=-5nsec
ΔT=-15nsec
ΔT=+15nsec
Differential
?
easy
easy
Difficult but not impossible
Cryogenic Equipment Preparation Status
at Iwatani
at PSI
New PT(190W) and
KEK original (65W)
Calorimeter operation without LN2 at PSI(Sep.to Oct.2004)
42-day operation without degradation in cooling performance
17/Jan wire installation & closing the cryostat
24/Jan setup in PiE5
-13/Feb evacuation
7-20/Feb liq. N2 piping
14/Feb-13/Mar liquefaction and test
14/Mar recovery
Purifier
cartridge
Liquid
pump
LP top flange
xenon
End of Slide
and position (point-like approx)
vertex reco. by weighted average of PMTs
(new QE set, see Fabrizio Cei’s talk)
i=r.m.s. of Ti
cut on Qi> 50 pe
T9
F20
s = (2905) ps
s = (345 5) ps
Side PMTs are less sensitive to z-fluctuations than Front PMTs