Transcript ppt

SVAC Status Report
Eduardo do Couto e Silva
November 7, 2002
SVAC EM Plan
• Requirements (LAT-MD-00446 – SVAC Plan)
– Test low-level calibration algorithms for CAL and TKR with an
integrated tower,
– Test and refine the SVAC database design necessary for the CU
activities,
– Test and refine quality check histograms necessary to validate MC
simulations,
– Test the geometry implementation in the SAS reconstruction
software that will be used for the CU activities
• Additional Goals (LAT-SS-00573 – SVAC EM Plan)
– GLEAM MC
• Validate raw distributions
– Prototype data analysis algorithms
• Energy Resolution for 17.6 MeV g
• Alignment
Data Taking Configurations
(to be reviewed)
Configuration
Particle
Source
Incident
Position
(X,Y,Z)
Incident
angle
(q,f)
Number of
Reconstructed
Events
Estimated data
taking time
(days)
Tower
Position
Comments
1
Cosmic rays
All
All
1,000,000
1.2
Vertical
Calibration
2
Cosmic rays
All
All
100,000
0.5
Horizontal
Background
sample
3
Photons
(100,50,900)
(5,0)
5000
4.8 (6.8*)
Horizontal
Top of TKR
4
Photons
(100,50,900)
(180,0)
TBD
TBD
Horizontal
Side of CAL
We have already simulated and estimated reconstructed rates for configurations 2 and 3
with an older GLEAM version.
We are now simulating all configurations with GLEAM v3.
According to R. Dubois this is the official version for EM and CU CDR studies.
If the GLEAM version changes it may affect the SVAC schedule
ID
Name
SAS
Software
EGSE Script
Configuration
Comments
C10
TKR Noisy Channels
Yes
No
1,2
Measure once/configuration for each TKR layer
C11
TKR Dead Channels
Yes
Yes
1,2
Measure once/configuration for each TKR layer. Prior
to data taking use EGSE script output as reference data
C12
TKR Time-OverThreshold Signal
No
Yes
Charge
injection
Measure for both GTRC in each layer to check linearity
and saturation
C13
TKR Time-OverThreshold Count
Distribution
Yes
No
1,2,3
Measure once/configuration for each TKR layer. Check
mean and widths as function of energy and particle type
C14
CAL Light Asymmetry
Yes
No
1
Measure muon peaks. Function of position in a log
C15
CAL Light Attenuation
Yes
No
1
Measure muon peaks. Function of position in a log
C16
CAL Light Yield
Yes
No
1
Measured for each face and for the sum of faces of the
log
C18
CAL Pedestals
Yes
Yes
1,2,3,4, Charge
injection
Prior to data taking run an EGSE script to get reference
centroid and widths for all energy ranges
C19
CAL Electronic Gain
No
Yes
Charge
injection
Prior to data taking run an EGSE script to get reference
gains for all energy ranges
C20
CAL Integral nonlinearity
No
Yes
Charge
injection
C22
CAL Noisy Channels
Yes
Yes
1,2,3,4, Charge
injection
Prior to data taking run an EGSE script to get reference
C23
CAL Dead Channels
Yes
Yes
1,2,3,4, Charge
injection
Prior to data taking run an EGSE script to get reference
C24
CAL LO Discriminator
No
Yes
Charge
injection
C25
CAL HI Discriminator
No
Yes
Charge
injection
C26
CAL Zero-Suppress
Threshold
No
Yes
Charge
injection
C27
Deadtime
No
Yes
1,2,3,4,
Obtain CAL, TKR and overall deadtimes
Dir goes from 0 to 180
Muons are symmetric around Y
Y dir = 180
muons
Z dir = 180
Y dir = 90
X dir = 90
Y
Z
X dir = 180
17.6 MeV g
X
2X
2Y
1Y
1X
0X
0Y
TOP
3% W
Z dir = 0
Y dir =90
X dir = 90
BOTTOM
EM GLEAM - W foils
Thin W foil after top tray
Thin W foil after top 3 trays
599
572
424
235
148
No track
1 track
2 tracks
26
More W foils decrease rate by 40% due to pattern recognition
MC Validation
( to be reviewed)
Cosmic Rays (muons)
Low Energy Photons
TKR Strip hit multiplicity for each layer (on axis)
●
●
TKR Strip hit multiplicity for each layer (off axis)
●
TKR Cluster multiplicity (num strips) for each layer
(on-axis)
●
TKR Cluster multiplicity for each layer (off-axis)
●
TKR ratio of double/single hits for each layer (on-axis)
●
TKR ratio of double/single hits for each layer (off-axis)
●
TKR TOT count distribution for each layer (on-axis)
●
TKR TOT count distribution for each layer (off-axis)
●
CAL Raw Energy Deposition for each layer (on-axis)
●
●
CAL Raw Energy Deposition for each layer (off-axis)
●
●
CAL Energy Loss (on-axis)
●
●
CAL Energy Loss (off-axis)
●
●
CAL MIP Energy Peak (on-axis)
●
●
●
Summary
• Requirements
– Test low-level calibration algorithms for CAL and TKR with an integrated
tower – definition and implementation stage - strongly dependent on
input from subsystems (e.g. scripts, macros, procedures,
documentation)
– Test and refine the SVAC database design necessary for the CU
activities – Implementation and test stage strongly dependent on input
from subsystems (e.g. queries)
– Test and refine quality check histograms necessary to validate MC
simulations – definition stage
– Test the geometry implementation in the SAS reconstruction software
that will be used for the CU activities – done
• Additional Goals
– GLEAM MC
• Measure Energy Spectrum of 17.6 MeV g - implementation stage
• Validate raw distributions – implementation stage, can be affected if
the GLEAM version changes
– Prototype data analysis algorithms
• Energy Resolution for 17.6 MeV g – definition stage,
• Alignment – definition stage