work at ipn orsay r&d on calorimeters jean peyré dec 2007
DESCRIPTION
Work at IPN Orsay R&D on Calorimeters Jean Peyré Dec 2007. 1: R&D Status at IPNO. Prototypes for Calorimeter. CsI(Tl) Crystals received from Scionnix. Dual Square PMTs (1 per 2 crystals) received from Photonis (3 PMT 9 stages). 1: Xtals received from Scionnix. Crystal #2. Crystal #1. - PowerPoint PPT PresentationTRANSCRIPT
Orsay - December 2007IPNO-RDD-Jean Peyré 1
Peyr
ej @
ipno
.in2p
3.fr
Work at IPN Orsay
R&D on Calorimeters
Jean PeyréDec 2007
Orsay - December 2007IPNO-RDD-Jean Peyré 2
Peyr
ej @
ipno
.in2p
3.fr
1: R&D Status at IPNO
Prototypes for Calorimeter
Dual Square PMTs (1 per 2 crystals) received from
Photonis (3 PMT 9 stages)
CsI(Tl) Crystals received from Scionnix
Orsay - December 2007IPNO-RDD-Jean Peyré 3
Peyr
ej @
ipno
.in2p
3.fr
1: Xtals received from Scionnix
Frustum Crystals #2 have been send back to Scionnix for non conformity
Reference Crystals #1 are kept for Xtalk tests
Crystal #1
Crystal #2
Orsay - December 2007IPNO-RDD-Jean Peyré 4
Peyr
ej @
ipno
.in2p
3.fr1: Xtals ordered from other
manufacturersNew crystals ordered :- Amcrys (Russia) and SICCAS (China)
Standard crystal 110mm long and lengthened crystal 140mm long to be able to protect PMT against Magnetic field with metal
Orsay - December 2007IPNO-RDD-Jean Peyré 5
Peyr
ej @
ipno
.in2p
3.fr
1: PMT’s
3 PMT’s-1 with window thickness 3mm-1 with window thickness 2mm-1 with window thickness 3mm + saw line
3mm
2mm 3mm+saw line
saw line
Orsay - December 2007IPNO-RDD-Jean Peyré 6
Peyr
ej @
ipno
.in2p
3.fr
1: PMT’s- measure of Crosstalk
We want to measure the Crosstalk between the two channels of the PMT when placing a crystal in front of one of the two channels.
Case AS1a=G1*NbPhé1aS2a=G2*NbPhé2a
Case BS1b=G1*NbPhé1bS2b=G2*NbPhé2b
Cross-Talk CH1->CH2NbPhé2a/NbPhé1a=S2a/S1a*G1/G2
CH1CH2
CH1CH2
Cross-Talk CH2->CH1NbPhé1b/NbPhé2b=S1b/S2b*G2/G1
NbPhé= Number of Photoélectrons created on each part of the photocathode & collected by first dynode
G= global Gain for each Channel(PMT+ChargePream+Shaper)
S= signal for each channel CH
Orsay - December 2007IPNO-RDD-Jean Peyré 7
Peyr
ej @
ipno
.in2p
3.fr
1: PMT’s- measure of Crosstalk
Cross-Talk = (S1b/S2b*S2a/S1a)1/2
Cross-Talk CH2->CH1 Cross-Talk CH1->CH2Are supposed equal(estimation of ±12% variation between both)
Window 3mm Window 2mm Window 3mm+saw line
Xtalk1 8.88% 7.95% 5.83%
Xtalk2 3.69%
Xtalk1= standard CrosstalkXtalk2= standard Crosstalk measured with a black foil
inserted in the saw line
The standard production of PMT will certainly provide a quite constant crosstalk between channels: easy to correct
Orsay - December 2007IPNO-RDD-Jean Peyré 8
Peyr
ej @
ipno
.in2p
3.fr2: Study of thin envelops for
LaBr3 Xtals with Saint-Gobain
LaBr3 with Standard package(thickness 2mm)
LaBr3 with Aluminium+Carbon package(thickness < 0,3 mm)
R% FWHM @662keV =2.9%
R% FWHM @662keV =3.3%
17x17x6mm
diam25x25mm
Orsay - December 2007IPNO-RDD-Jean Peyré 9
Peyr
ej @
ipno
.in2p
3.fr
3: Magnetic field R3B
Magnetic field along Zm axis of Magnet
600 Gauss
(0,0,0) m
Zm
Xm
Beam axis14°
Target
1450mm
R3B Calorimeter
2.2T Magnet
Ym
Zc Yc
Xc
(0,0,0) m
Zm
Ym
Beam axis
2.2T Magnet
Xm
ZC
YC
XC
R3B Calorimeter
Discussion with J.E. Ducret from CEA Saclay on September 24th, 2007
Orsay - December 2007IPNO-RDD-Jean Peyré 10
Peyr
ej @
ipno
.in2p
3.fr
3: Magnetic field R3B
(0,0,0) m
Zm
Xm
Beam axis14°
Target
1450mm
R3B Calorimeter
2.2T Magnet
Ym
Zc Yc
Xc
Iron wall 2m*2m*10cm
News from J.E. Ducret December 2007: simulation of an iron cylinder around the calorimeter with a clearance of 10 cm around the barrel. iron wall seems not so easy to implement between calorimeter and magnet.
New meeting with J.E. Ducret on October 31th 2007People from Saclay are going to simulate the addition of a 2m*2m*10cm iron wall to protect the calorimeter from magnetic field
Iron cylinder