Advanced CGEM Calibration and Alignment Techniques

 
CGEM
探测器刻度和校准
 
 
outline
 
Calibration
Alignment
 
calibration
 
To provide measurement error of the cluster position which is  used in
 the least square fit of the track
Can be extracted from the residual distribution which is  defined on
the previous page
As a function of
 
– layer
 
– entrance angle
 
– Cluster size
 
Used in reconstruction and digitization in  micro‐TPC readout mode
v = s/t
s: distance between cluster and the mid‐point of  the track segment in
drift region
t: drift time
 
Time related calibration
 
Alignment
 
Motivation
Alignment parameters
Alignment methods
Update of Geometry Service
Test of misalignment
 
Motivation
 
Misalignment
 
 
 
 
 
 
 
Alignment
 
-For improve the precision of track reconstruction and reduce the
 
systemic uncertainties of experiment
 
(a) Misaligned geometry
 
(b) Ideal geometry
 
Normal
 
With misalignment
 
Residual
 
Alignment methods
 
 
Update of Geometry Service
 
New classes was added:
 
-StraightLine: to provide straight line track related calculations
 
-CgemGeoAlign: to provide geometry calculations and
 
conversions related to alignment
 
-CgemMidDriftPlane: to provide calculations of the hit position
 
Test of misalignment
 
Translation of layer 1 in x
−−
  
x=0.2mm
−−
 
x=0.4mm
−−
 
x=0.6mm
 
Residual of dr (mm)
 
Residual of phi0
 
Residual of dz (mm)
 
Residual of tan
 
translation in x direction causes the shift of dr reconstruction
 
Test of misalignment
−−
 
z=0.2mm
−−
 
z=0.4mm
−−
 
z=0.6mm
 
Translation of layer3 in z
 
Residual of dr (mm)
 
Residual of phi0
 
Residual of dz (mm)
 
Residual of tan
 
 translation in z direction causes the shift of dz reconstruction
 
Test of misalignment
 
Residual of dr (mm)
 
Residual of phi0
 
Residual of dz (mm)
 
Residual of tan
 
Rotation of layer 1 in z
 
it seems there is little misalignment effect if layer1 is unaligned around z. the reason may be the
layer 1 is in the inner region. next we will check the results if layer 3 is unaligned around z.
 
 
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Explore advanced calibration and alignment techniques in CGEM technology, including Lorentz angle correction, spatial resolution analysis, drift velocity computation, time-related calibration, and alignment methods. Learn about misalignment motivations and strategies to improve track reconstruction precision in experiments.

  • CGEM
  • Calibration
  • Alignment Techniques
  • Lorentz Angle
  • Drift Velocity

Uploaded on Sep 07, 2024 | 0 Views


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Presentation Transcript


  1. CGEM

  2. outline Calibration Alignment

  3. calibration Lorentz angle (?) Spatial resolution of single cluster (?) Drift velocity (?) Time related calibration

  4. Lorentz angle (?) The angle between the drift line and the direction of electric field For correcting of the position of the cluster ? can be corrected by the shift of residual distribution (r = ?? ??)

  5. Spatial resolution of single cluster (?) To provide measurement error of the cluster position which is used in the least square fit of the track Can be extracted from the residual distribution which is defined on the previous page As a function of layer entrance angle Cluster size

  6. Drift velocity (?) Used in reconstruction and digitization in micro TPC readout mode v = s/t s: distance between cluster and the mid point of the track segment in drift region t: drift time

  7. Time related calibration TTDC= TOEs+ Tflight+ Tdrift+ TOelec+ Tprop Used in both reconstruction and digitization in the case of micro TPC readout mode TOelecwill be calibrated strip by strip Tpropis a function as layer, z & type of the strip (x or v)

  8. Alignment Motivation Alignment parameters Alignment methods Update of Geometry Service Test of misalignment

  9. Motivation Misalignment Normal With misalignment (b) Ideal geometry (a) Misaligned geometry Residual Alignment -For improve the precision of track reconstruction and reduce the systemic uncertainties of experiment

  10. Alignment methods

  11. Update of Geometry Service New classes was added: -StraightLine: to provide straight line track related calculations -CgemGeoAlign: to provide geometry calculations and conversions related to alignment -CgemMidDriftPlane: to provide calculations of the hit position

  12. Test of misalignment x=0.2mm x=0.4mm x=0.6mm Translation of layer 1 in x Residual of dr (mm) Residual of phi0 Residual of tan Residual of dz (mm) translation in x direction causes the shift of dr reconstruction

  13. Test of misalignment z=0.2mm z=0.4mm z=0.6mm Translation of layer3 in z Residual of dr (mm) Residual of phi0 Residual of tan Residual of dz (mm) translation in z direction causes the shift of dz reconstruction

  14. Test of misalignment ??=0.001rad ??=0.002rad ??=0.003rad Rotation of layer 1 in z Residual of dr (mm) Residual of phi0 Residual of tan Residual of dz (mm) it seems there is little misalignment effect if layer1 is unaligned around z. the reason may be the layer 1 is in the inner region. next we will check the results if layer 3 is unaligned around z.

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