giovanni signorelli, infn, scuola normale and dipartimento di fisica, pisa psi, february 2003 1 lxe...
Post on 19-Dec-2015
215 views
TRANSCRIPT
![Page 1: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/1.jpg)
1Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
LXe (part B)
Giovanni Signorelli
Istituto Nazionale di Fisica Nucleare, Dipartimento di Fisica and Scuola Normale Superiore, Pisa (Italy)
PSI, February 2003
![Page 2: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/2.jpg)
4Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Monte Carlo
•QE - shape
•Pile-up
•segmentation
![Page 3: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/3.jpg)
5Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
An example of e decay
![Page 4: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/4.jpg)
6Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Pair events:• Signal: • Radiative decay (correlated bck)• Michel positron + -bckPositron only events:• Signal positron• Michel positronGamma only events:• Signal • with flat spectrum• Bck: from radiative decay or annihilation in flight
eγμ
Event Generation: MEGEVE
![Page 5: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/5.jpg)
8Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Interaction point
Energy deposit
, , z, tE
interaction in Lxe.
•Scintillation photons are traced inside the liquid Xenon and followed until they reach the PMTs
•Absorption and diffusion may occur
![Page 6: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/6.jpg)
10Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
LiXe energy resolution
•Ineffective for short ( 1 m ) absorption length
•Important for timing resolution (see later on…)
Shape studies:Curved vs BOX (100 x 50 x 50 cm3): different geometry on position and energy resolution.
• position resolution: no difference. (10.6 mm FWHM)•a 3% systematic correction is needed on both coordinates for VLP
• energy resolution: slight improvement (from 4% to 3.5%);
• energy containment: more critical problem
a much larger volume (1.5 m3) of Xenon would be needed (and PMTs!).
QE studies:QE abs=1 m abs=
5% 6% 2.0%
10% 6% 1.7%
20% 6% 1.5%
![Page 7: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/7.jpg)
14Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
VLP: 3.5 % Curved detector: 4 %
Energy resolution comparison•Absorption length = 1 m, various positions
•linear fit (PCA)
![Page 8: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/8.jpg)
18Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
E/E < 4% for Abs > 1 m
(linear fit, PCA)
Energy resolution vs. absorption
![Page 9: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/9.jpg)
19Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Abs for last test
Observed/Expected light vs distance
Att.>1 m
![Page 10: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/10.jpg)
20Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Segmentation
• 6 layers of PMTs inserted at –30, 0, and 30 degrees– PMTs are placed on all walls with maximum density to keep the
homogeneity same in both segmented and non-segmented cases.
– Resolution is estimated by using simple Qsum
• We can observe more pe in case of short abs
– abs=1m: resolution 15.4%11%
• We loose efficiency due to the dead volume occupied by inserted layers of PMTs in any case.
• In case of long abs, energy leakage in the PMT layers cause deterioration of resolution in addition to the efficiency loss.
abs non-segmented segmented Eff loss(relative)
1m 15.4% 9.7% 11%
5m 3.7% 3.7% 28%
1.5% 2.0% 44%
![Page 11: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/11.jpg)
21Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Segmentation[2]
![Page 12: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/12.jpg)
22Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Reflector
• Reflector does not help to reduce the path length of scintillation light.
• Reflection efficiency (< 100%) can cause nonuniformity.
Ray=30cm
Ref eff =100%
No absoption
w/o reflector
w/ reflector
![Page 13: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/13.jpg)
23Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Reflector[2]
![Page 14: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/14.jpg)
24Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Pile-up and sensitivity
In the 90% acceptance window
Prompt background:
34 10-15per + decay
Accidental background:
2.23.5 10-14 per + decay
23107 +/sec And S.E.S. 3.65.6 10-
14
e
e+e-
Besides these high energy photons...
![Page 15: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/15.jpg)
25Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
FULL SIM of pile up in LXeRate=23 107 /sec
Made use of no topological cut (clusters, electron, pulse shape….)
+ 5% events in the signal region
There is a 180 kHz rate of photons with E>0.5 MeV due to e
FULL SIMULATION!
How often an accidental superposition of two background events gives a signal in the 90% acceptance window around 52 MeV?
1 intrusion every 50 gates 100 ns wide
With this proportion add the signals PMT by PMT
Perform the energy reconstuction
![Page 16: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/16.jpg)
26Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Reconstruction of bkg events
’s from radiative decay; set of constants computed using signal events.
A small bias, but very small spill-in
of background in the signal region.
![Page 17: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/17.jpg)
28Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
MC conclusion
• High absorption length curved shape is ok.
• QE improvement welcome (see timing resolution…)
• (accidental)2 background not harmful
![Page 18: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/18.jpg)
29Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
MC for QE measurement?•Use the 4 alpha-sources inside the Large Prototype and compare data and MC with NO ABSORPTION ( need to use Gxe @ 170 K)
•The method depends very much on the details of the simulation (reflection on the PMT window and on walls….)
• we excluded PMTs on the alpha face but only three points left
•Need for a dedicated test station to measure all QE
![Page 19: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/19.jpg)
30Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
PMT characterization
- FULL DESIGN AND MECHANICAL DRAWINGS COMPLETED
- CALL FOR TENDERS MADE AND JOB ASSIGNED TO THE COMPANY CINEL-Vigonza (PD), Italy
- CRYOSTAT DELIVERY EXPECTED BY THE END OF FEBRUARY
- ORDERS MADE FOR DRY UHV PUMPING GROUP, LEAK DETECTOR, UHV COMPONENTS, CRYOGENIC BOTTLE, PMT’s …
- LABORATORY PREPARATION UNDER WAY
- FOR MORE INFORMAITON ASK FRANCO
![Page 20: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/20.jpg)
31Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Data
•With •With runs
•With electrons
•….
![Page 21: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/21.jpg)
33Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
LEDs-source
The LP from “inside”
-sources and LEDs used for PMT calibrations and monitoring
![Page 22: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/22.jpg)
34Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
QE measurement•Use the 4 alpha-sources inside the Large Prototype and compare data and MC with NO ABSORPTION ( need to use Gxe @ 170 K)
•The method depends very much on the details of the simulation (reflection on the PMT window and on walls….)
• we excluded PMTs on the alpha face but only three points left
•Need for a dedicated test station to measure all QE
![Page 23: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/23.jpg)
35Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
QE: better go 5 106
•Due to the higher Wph for Gas Xenon the alpha signal in gas used to be cut
The old quantum efficiencies were slightly over-estimated
OLD NEW
![Page 24: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/24.jpg)
36Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Purity and other uses
Alpha source: measured/expected light as a function of the -PMT distance
Present... Cfr. May test
Alpha source measurements: essential for purity monitor and physics measurements (n, Rayleigh,…)
Att.>1 m
![Page 25: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/25.jpg)
37Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Diffusion length (Rayleigh)
In Gxe consistent with Ray =
•Ratio of the charge collected on the face containing the alpha source to the total collected charge
•Independent of the absorption
Ray 70 cm
Still some systematics to be studied depending on the MC (reflections on PMT windows and LP material…)
![Page 26: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/26.jpg)
38Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Radioactive background w/LP
-trigger with 5106 gain
•Geometrical cuts to exclude -sources
•Energy scale: -source
•208Tl (2.59±0.06) MeV
•40K (1.42 ± 0.06) MeV
•214Bi 208Tl ??
•uniform on the front face
•few 10 min (with non-dedicated trigger)
• nice calibration for low energy ’s
40K (1.461 MeV)
208Tl (2.614 MeV)
•Seen for the first time! Studies are going on: spatial distribution of background inside the detector
![Page 27: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/27.jpg)
39Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Timing resolution test
t = ( z2 + sc
2)1/2 = (802 + 602)1/2 ps = 100 ps (FWHM)
Time-jitter due to photon interaction
Scintillation time, photon statistics
Measurement of sc2 electron beam
Use of Kyoto Syncrotron Ring (KSR) @ 60 MeV (2/12/026/12/02)
![Page 28: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/28.jpg)
40Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Timing resolution
•60 MeV e- material degradation only 128 channels (out of 228) had the TDC
•We estimate the intrinsic timing resolution vs p.e.
•divide PMTs in two groups: sc=RMS[( TL-TR)/2] at center
•TL,R = weighted average of the PMT TDCs (time-walk corrected)
0 6 12 18 24 30 36 42
Qsum (MeV)
Q/1
t
t(TDC)
![Page 29: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/29.jpg)
41Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
TR (2)
5%10%
15%QE
•A factor of 10 in number of photo-electrons w.r.t. the Small Prototype
52.8 MeV peak
•Analysis still in progress: position-depentent corrections and cross talk problems
![Page 30: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/30.jpg)
42Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Resolution (preliminary)
sc = 200 ps (FWHM)Still to be done:
•event filtering
•full event reconstruction
(need to account for position correction)
![Page 31: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/31.jpg)
44Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
V light in Xe?
•Using the correlation between the fitted coordinates of the “center” of the shower and the difference in arrival times on the various LP faces one can estimate v light and n for Xenon.
n1.7
•Need to refine the technique
•Understand via MC what is the meaning of “center of shower” and TL,R,….
![Page 32: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/32.jpg)
45Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Data conclusion
runs are essential for monitoring
• Xenon is pure!
• The timing resolution is consistent with the expectations but needs to be checked
![Page 33: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/33.jpg)
46Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Is LP completely full of LXe?1st clue: the top-source peak is higher in Lxe but not in GXe
The source somehow gets more distant from the wall! (5 mm)
MC charge collected
![Page 34: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/34.jpg)
47Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Lxe full? (2)
2nd clue: central spot:
a) gives a lower peak at correct z
![Page 35: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/35.jpg)
48Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Central Spot (2)
B) easy explanation for its position
![Page 36: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/36.jpg)
49Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Face Q ratio
•R-1= Charge of the face with alpha/ Charge on opposite face
•R is different for LIQUID and GAS because of Rayleigh scattering
•Rliquid 1 RGas 3
![Page 37: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/37.jpg)
50Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Time Evolution
![Page 38: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/38.jpg)
51Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Data conclusion
runs are essential for monitoring
• Xenon is pure!
• The timing resolution is consistent with the expectations but needs to be checked
![Page 39: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/39.jpg)
52Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
End
![Page 40: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/40.jpg)
53Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Background distribution
![Page 41: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/41.jpg)
54Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Selection in z
2 is the rms of the front face charge distribution
![Page 42: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/42.jpg)
55Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Predicted 208Tl position
•Tl peak slightly below -peak
•Take the difference in light-yield between and (20 %)
![Page 43: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/43.jpg)
56Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Is the LP full of Xenon?
GXe
LXe
![Page 44: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/44.jpg)
57Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Clues
•Higher peak
•Position: central spot
•A low-energy peak.
•Ratio of face charges
•Develop in time
![Page 45: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/45.jpg)
58Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Possible Xe level
5 mm of Gxe gap
![Page 46: Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003 1 LXe (part B) Giovanni Signorelli Istituto Nazionale di](https://reader030.vdocuments.net/reader030/viewer/2022032703/56649d2a5503460f949ff295/html5/thumbnails/46.jpg)
59Giovanni Signorelli, INFN, Scuola Normale and Dipartimento di Fisica, Pisa PSI, February 2003
Kyoto Storage Ring
beam to LXe prototype