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Status Report of the Bologna Scanning Lab. Bologna Scanning Lab. Last activities in the Bologna scanning lab Scanback of the cosmic muon bricks (8199, 5914) extracted from the OPERA apparatus with the CSD scanned at LNGS Test of the lateral X-ray mark finding with the ESS

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status report of the bologna scanning lab
Status Report of the Bologna Scanning Lab

Bologna Scanning Lab

Last activities in the Bologna scanning lab

  • Scanback of the cosmic muon bricks (8199, 5914) extracted from the OPERA apparatus with the CSD scanned at LNGS
  • Test of the lateral X-ray mark finding with the ESS
  • Installation of the last DB-driven scanning infrastructure and new acquisition software modules
  • CERN 2007-July pion test beam analysis
cs brick connection 8199 5914
CS-Brick Connection (8199, 5914)
  • Brick 8199LNGS prediction: SX = -0.403SY = 0.518projected to -4800 µm from CS2

best candidate:ΔX = -95 µm ΔY = 57 µm ΔSX = 3 mradΔSY = 7 mradPH = 29

  • Brick 5914LNGS prediction: SX = 0.117SY = 0.408projected to -4800 µm from CS2

best candidate:ΔX = -52 µm ΔY = -89 µm ΔSX = 6 mradΔSY = 12 mradPH = 24

brick 8199 scanback old sw
Brick 8199 Scanback [old sw]
  • The scanback of this brick was presented in the last meeting (2007-07-18). the track followed from pl 56 to pl18 (then the track comes out of the brick side)

 basetracks found in 33 plates out of 39 (1 plate skipped because of mark on the wrong side) all base tracks confirmed by visual inspection

SX

SY

brick 8199 scanback new sw
Brick 8199 Scanback [new sw]
  • A new scanback of the same predicted track performed:

OLDNEWold DB schema DB schema 4.x sysal.net beta2 sysal.net 2.1vertigoscan5 vertigoscan5.3smarttracker8 smarttracker8.4optical marks lateral X-ray marks3x1cm² calibr. zones none

brick 8199 scanback new sw2
Brick 8199 Scanback [new sw]

[old sw]

[old sw]

RMS 20 µm

RMS 34 µm

FPX-PPX (µm)

FPY-PPY (µm)

[new sw]

[new sw]

RMS 22 µm

RMS 16 µm

FPY-PPY (µm)

FPX-PPX (µm)

brick 8199 scanback new sw3
Brick 8199 Scanback [new sw]

[old sw]

[old sw]

RMS 8 mrad

RMS 12 mrad

FSX-PSX

FSY-PSY

[new sw]

[new sw]

RMS 17 mrad

RMS 12 mrad

FSY-PSY

FSX-PSX

brick 5914 scanback new sw
BRICK 5914 scanback [new sw]

SX

SY

7/13

Scanback paused at plate n.13 to check reason of inefficiency

brick 5914 offline check
BRICK 5914 offline check
  • 1 cm2 x 10 plates scanned around the prediction.
  • offline scanback performed after volume fine alignment5 basetracks and 3 microtracks found out of 10 plates

Basetracks manually confirmed.

  • The track seems to have lower pulse with respect to the track of brick 8199. Under investigation…
lateral mark finding with ess
Lateral Mark Finding with ESS
  • All the scanback done with lateral X-ray marks and without intercalibration zones.The implementation of the lateral X-ray mark finding in the ESS scanning software presented in the last meeting (2007-07-18). Currently, the automatic search of the first mark has been tested and the manual setting of mark position implemented (but never used).
  • Comments:The mark finding module works smoothly.The mark finding reproducibility is very good (a few µm).The presence of a duplicated x-strip 1 mm far from the reference one caused some failures during tests. The software has been modified and will be tested as soon as possible
test beam @ cern july07
Test Beam @ CERN July07

PRELIMINARY

Scanning the data-set: F9-F16(8 consecutive plates 2 weeks in the oven)

Beam: pions @ 10GeV

7 beam directions with about 5 tracks/mm2 each

Scanning surface: 2x2 cm2 on each plate

x: -70000-50000

y: 40000 60000

Total scanned area: 460 mm2

raw data
Raw data:

~ 350-400 micro-tracks /view

(slope < 0.75 rad)

~ 4500-5000 cluster /layer

micro tracks
Micro-tracks

Bottom side

Top side

base tracks quality
Base Tracks-quality

All linked base-tracks

Peaks selection (5 sigma)

Quality cut: chi2<0.5*PH-5

conclusions
Conclusions
  • Scanback and volume scan of the cosmic muon bricks extracted from the OPERA apparatus are in progress.
  • The scanning done with the the last DB-driven scanning infrastructure, the newer acquisition software modules and with lateral X-Ray mark.
  • The implementation of Lateral X-Ray mark finding in the ESS software is in progress. Test version are working smoothly.
  • CERN 2007-July pion test beam analysis in progress.
lateral mark finding reproducibility
Lateral Mark Finding reproducibility

X0 Y0 X1 Y1#find home...

8199 1 0 0 125352.1 8226.9 125309.9 103026.2

8199 1 0 0 125353.9 8230.4 125311.1 103030.1

8199 1 0 0 125353.1 8225.3 125310.8 103029.7

8199 1 0 0 125353.1 8228.1 125311.1 103028.2

8199 1 0 0 125352.9 8228.2 125311.1 103028.0

8199 1 0 0 125353.5 8227.7 125310.8 103027.3

8199 1 0 0 125353.2 8224.6 125309.4 103029.0

8199 1 0 0 125352.8 8227.8 125310.6 103027.2

8199 1 0 0 125353.9 8227.8 125310.8 103027.0

8199 1 0 0 125352.8 8228.2 125309.3 103028.0

8199 1 0 0 125353.3 8226.0 125311.0 103025.6

8199 1 0 0 125353.1 8225.7 125310.1 103031.6

8199 1 0 0 125353.0 8227.7 125312.7 103027.0

8199 1 0 0 125353.0 8227.9 125310.2 103027.0

8199 1 0 0 125354.8 8228.1 125309.5 103027.6

8199 1 0 0 125353.5 8228.5 125311.3 103027.3

# find home ...

8199 1 0 0 125354.5 8227.8 125312.2 103026.6

8199 1 0 0 125353.1 8226.4 125315.2 103026.6

8199 1 0 0 125353.2 8226.6 125315.3 103026.2

8199 1 0 0 125353.2 8227.8 125315.2 103027.6

8199 1 0 0 125353.3 8226.4 125315.3 103026.5

8199 1 0 0 125353.9 8224.3 125315.9 103027.6

8199 1 0 0 125354.9 8226.5 125312.3 103024.6

8199 1 0 0 125353.5 8228.1 125315.6 103026.9

8199 1 0 0 125353.0 8224.2 125314.9 103028.9

mark recognition
Mark recognition

Not possible to be done:

  • No extra camera with low magnification optics are available
    • Only a small amount of the lines can be scanned
  • The two lines are not always long enough to print a clear crossing point
    • Not possible to scan only one FOV per mark

The approach is:

  • Three pieces of each line are scanned and lines are obtained by a linear fit. The coordinates of intersection point are the mark coordinates.

NO

NO

Intersectionpoint

mark finding procedure
Mark finding procedure

This is the procedure currently under test.

4. Repeat 2,3for the 2nd line

1. Set the corner

2. Scan this edge to find a first line segment

3. Scan further two line segment here

6. Evaluate the intersection points and evaluate the transformation

5. Repeat 2,3,4 for the second mark

scan back vacuum groove position
Scan Back: vacuum groove position
  • scan back of brick 8199 and brick 5914 with a predicted muon
  • This scanning has been done at Bologna using a vacuum system with a standard vacuum channel
  • To avoid interference with the image of the vacuum channel the emulsion plate was placed at the edge of the channel with lateral mark outside the vacuum area.

Vacuum channel

slide27

2

3

4

1

The MARK is the intersection point between 1 and 2

WARNING:3 can be confused with 2

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