HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
LumicalR&D progress report
Ronen Ingbir
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Dense design
Design variations
Luminosity study Future
steps
1.Phi bias
2. Delta theta
3. Real life approach
4. New selection mechanism
1. Moliere radius
2. Radiation length
3. Detector properties
4. Design optimization
1. Margins design properties
2. Events close to margins
3. Maximum pick shower design
4. Remarks
Prague follow up
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Constant value
Constant value
)(deg)(
)(deg)_( genrecmean
250 GeV
Fixed non zero bias under investigation.
Events Num.E weight.
Log. weight.
(deg)genrec
Azimuthal reconstruction
Two plots convinced us that the bias observed is not detector design dependent nor imperfect algorithm.
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
48 sectors design
(deg)genrec X (cm)
Y (cm)
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Magnetic field
Constant value
Constant value
))(_( radmean genrec
))(( rad400 GeV
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
)(radgenrec
)(radgen
Log. weight.
E weight.
Polar reconstruction
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
44 103.1107.5
‘Pure’ electrons simulation
Bhabha+Beam+BS(5e-4)
)(radgenrec
Bias study
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Real life algorithm
Working with both sides of the detector and looking at the difference between the reconstructed properties:
(In real life we don’t have generated properties)
2new
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Polar resolution
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Energy resolution
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
33 mrad
Energy Resolution )( GeV
)(rad
The most significant event selection cut is the geometric acceptance cut.
This cut was used to get the best energy, angular resolutions and minimum biases.
Events selection
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Out
In
Eout - EinEout + EinP=
New selection cut
Ring
Signal
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Eout-EinEout+EinP=
)(rad
Out
In
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
3 cylinders
3 Rings
2 cylinders
3 Rings
1 cylinders
3 Rings
Eout-EinEout+EinP=
)(rad
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Dense design
0.34 cm Tungsten
0.31 cm Silicon
15 cylinders * 24 sectors * 30 rings = 10800 cells
8 cm
28 cm
0.55 cm Tungsten
0.1 cm Silicon
RL20 cm 20 cm
6.1 m
Dense0.156e-3Regular0.137e-3
Dense, 35%
Regular, 27%
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35
Ang
ular
res
olut
ion
(rad
)E
nerg
y re
solu
tion
(GeV
)^0.
5
Regular
Dense
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Basic properties
?
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Moliere radius
0.8cm
1.1cm
X (cm)
Detector Signal
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Radiation length
30 radiation length detector47 radiation length detector
Z (cm)
Detector Signal
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Optimization
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
16 cylinders 40 rings
15 cylinders 30 rings
Polar resolution & bias
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
16 cylinders 40 rings
15 cylinders 30 rings
Energy resolution
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
)(rad
Energy Resolution )( GeV
)(rad
Events
New geometric acceptance
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Optimization
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Optimization
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Margins around cells
Having margins
Means
Losing Information
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
One cylinder One sector
Radius (cm) ) deg(
Det
ecto
r si
gnal
Det
ecto
r si
gnal
Loosing information
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Energy resolution
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Polar resolution
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Our basic detector is designed with
30 rings * 24 sectors * 15 cylinders = 10,800 channels
Do we use these channels in the most effective way?
Maximum pick shower design
30 rings 15 cylinders
20 cylinders
10 cylinders
24 sectors * 15 rings * (10 cylinders + 20 cylinders) = 10,800 channels
4 rings 15 rings 11 rings
10 cylinders
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Maximum pick shower design
Basic Design
Angular resolution improvement
without changing the number of
channels
Other properties remain the same
))(_( radmean genrec
))(( rad
Constant value
Constant value
Polar reconstruction
0.11e-3 rad0.13e-3 rad
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Remarks
Options to minimize the margin effect:
1. Rings rotation.
2. Different cylinders segmentation
Maximum pick shower design can enable us to reduce the number of channels while maintaining properties or to improve properties while kipping the same number of channels.
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
Pure electron MC
Detector properties
Events selection
‘Real physics’ MC + digitization noise + New max pick design + Margins
Final optimization
‘Real physics’ MC
Bhabha + Beamstrahlung + Beamspread
R&D status & future steps
))(,,),(( EENN
LL High statistics MC for
required precision
410 N
N
HEP Tel Aviv UniversityLumical - A Future Linear Collider detector
THE END
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