Implementing CFT asbuilt geometry

1
Implementing CFT as-built geometry

• Basic element of the CFT geometry is ribbon
• 2 staggered layers of scintillating fibers on a
  helical surface/cylinder
• 304 axials and stereos in total
• characterized by rfiber, pitch, Rsurface , stereo
  angle
• space position is defined by (x, y, z) at origin
  and 3 Euler angles
• extract these parameters from survey data CMM
  measurements at LAB 3 during the construction
• Coordinate systems and fiber numbering scheme

2
Implementing CFT as-built geometry

• rcps from survey data analysis (Gaston)
• cft_reference.rcp
• double CFT_BARREL5_ADOUBLET_RIBBON0_LAYER0 (
  // ribbon 5a-13
• 0. 0. 0.
  // 0. 0. 0.
• 5.655941 0. 0.
  // phi 0. 0.
• 39.6303 0.09709970 0.0000000 )
  // r pitch dphi/dz
• double CFT_BARREL5_ADOUBLET_RIBBON0_LAYER1 (
  // ribbon 5a-13
• 0. 0. 0.
  // 0. 0. 0.
• 5.657166 0. 0.
  // phi 0. 0.
• 39.6982 0.09726601 0.0000000 )
  // r pitch dphi/dz
• cft_move.rcp
• double CFT_BARREL5_ADOUBLET_RIBBON0_LAYER0 (
  // ribbon 5a-13
• -0.0023 -0.0043 0.
  // x0 y0 z0
• 0.000109 0.000076 0.000012
  // phi theta psi
• 0. 0. 0. )
  // changes in r pitch dp/dz
• double CFT_BARREL5_ADOUBLET_RIBBON0_LAYER1 (
  // ribbon 5a-13
• -0.0023 -0.0043 0.
  // x0 y0 z0

double CFT ( // element name 0 0 0
// translation vector 0 0 0) //
Euler angles in xyz notation double CFT_BARREL1
( // element name 0 0 0 //
translation vector 0 0 0) // Euler
angles in xyz notation double CFT_BARREL1_ADOUBLET
( // element name 0 0 0 //
translation vector 0 0 0) // Euler
angles in xyz notation double CFT_BARREL1_ADOUBLET
_RIBBON0 ( // element name 19.1111
6.15774 0 // translation vector
-0.311705 0 0) // Euler angles in xyz
notation double CFT_BARREL1_ADOUBLET_RIBBON0_LAYER
0 ( // element name 7.10543e-15
1.77636e-15 0 // translation vector
-0.311705 0 0) // Euler angles in xyz
notation double CFT_BARREL1_ADOUBLET_RIBBON0_LAYER
1 ( // element name 7.10543e-15
1.77636e-15 0 // translation vector
-0.314159 0 0) // Euler angles in xyz notation
3
Implementing CFT as-built geometry

• Cylinder 5, axial doublet CFTX5

Y (cm)
X (cm)
4
Implementing CFT as-built geometry

• Cylinder 5, axial doublet CFTX5

Y (cm)
X (cm)
5
Implementing CFT as-built geometry Cylinder
5, axial doublet CFTX5
Edge to edge variation of lt 100 mm in rf within
a ribbon Global tracking requires geometrical
precisions lt 30 mm Essential to implement
corrections
6
Implementing CFT as-built geometry

• Survey data for cylinder 5, axial ribbons,
  before and after visual alignment with D0Scan
• using pT100 GeV muons MC
• Some details
• make_aligned_geometry to create a new
  geometry, e.g., using survey data analysis
  (Gaston)
• activate proper GeometryType in the
  geometry_management.rcp
• do visual alignment of different subdetectors
• do final alignment using residuals

7
CFT event display Run/Event 117121/115406

• ADC cut 70 in SFTDigiChunk
• Data base geometry
• Reconstructed tracks in CFT
• No SMT/CPS hits in this run