Status of the Bologna scanning laboratory G. Sirri for the Bologna Group* Nagoya 7-9 Dec 06 Bologna Group: L. Consiglio (PhD), M. Cozzi, D. Di Ferdinando (PhD), G. Giacomelli, M. Giorgini, G. Mandrioli, L. Patrizii, M. Pozzato (PhD), M . Sioli, G. Sirri + 2 undergrad. students, 3 technicians
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Status of the Bologna scanning laboratory G. Sirri for the Bologna Group* Nagoya 7-9 Dec 06 Bologna Group: L. Consiglio (PhD), M. Cozzi, D. Di Ferdinando.
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Status of the Bologna scanning laboratory
G. Sirri for the Bologna Group*
Nagoya 7-9 Dec 06
Bologna Group:
L. Consiglio (PhD), M. Cozzi, D. Di Ferdinando (PhD), G. Giacomelli,M. Giorgini, G. Mandrioli, L. Patrizii, M. Pozzato (PhD), M . Sioli, G. Sirri
+ 2 undergrad. students, 3 technicians
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Bologna Emulsion Laboratory
MIC 1
MIC 2
MIC 3
MIC 4 Standard ESS setup+ DRY objective Correction collar moving setup
Standard ESS setup
Standard ESS setup
Prototype ESS – High ResolutionZeiss 100x oil objectiveVision/Motion Synchronization
2 air-conditioned rooms connected with the computing room (gigabit)
Space for 2 automatic exchangers
4 microscopes all driven by the DB batch manager.
D043
D041
D044
D042
c
orrid
or
4
21
3 ntd
3/16
The microscope is equipped with : ZEISS 100x objective | N.A. 1.3 ZEISS tube lens hosted in a custom tube Stage with higher load capacity
[MICOS HPS-170] Legs with air suspension mechanisms to
reduce vibrations. Custom CMOS camera (same sensor as
mikrotron mc1310) Motion/Vision synchronization using libACQ (by
Bern) Illumination, horizontal stage, motor controller,
frame grabber, workstation are the same as ESS This microscope is used for manual checks, fog
density and grain size measurements and normal scanning.
MIC1: High Resolution
MIC1: parameters optimization for scanning with both SySal and libACQ acquisition software in progress.R&D for homogeneous immersion (oil condenser N.A 1.4)
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Nikon ELWD PlanFluor DRY objective magnification: 40x (nominal) numerical aperture: 0.60 working distance: 1.8 mm correction range: 0-2 mm
A DC motor, drive belt and serial motor controller has been mounted in a Nikon microscope. SySal acq sw modified.
Working conditions: two collar positions c.c. 0 for the TOP scanning
c.c. 0.3 for the BOTTOM scanning
The magnification depends (a bit) on the correction. The focal plane vertical position depends (largely) on the correction position (ΔZ~ 40 µm).
MIC4 setup and the dry objective optimization in progress. Another prototype of collar handler is coming.
MIC4 : ESS with also NIKON DRY collar correction objective
5/16
MIC2, MIC3 : ESSs ready for the October Run
MIC2 and MIC3 ready for the October Run according to the specifications agreed within the scanning working group.
How to improve the accuracy and stability of the measurements? f.e. how to deal with scanning in case of high fog emulsion sheet (as in the november cosmic rays test for CS-brick connection)?
- Installation and test of new software modules (tracking, … ) - Test of new filters
We suggest to take into account also some points, for example:
- Motion/Vision synchronization during acquisition - Microtracks on-line rejection using adequate quality evaluators- Use focus data as guess for on-line shrinkage evaluation
6/16
Analyses in progress in Bologna
Peanut analysis: BL044 BL088
Cosmic ray exposure (shielding and handling): brick transportation unit validation internal shielding
CS-brick connection (November c. r. exposure test)
Edge scanning with ESSdedicated talk (10’)
7/16
4 bricks exposed at FNAL:
Brick Beam Exposure(days)
Cosmic Ray Exposure
(h)
BL044 20.71 2
BL034 17.75 2
BL088 28.18 12
BL087 28.18 12
Peanut analysis:
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Rejected all verticeswhose tracks were not all downstream the vertex
Found 148 vertices
Required that at least one track from the vertex reaches the end of the brick.
43 vertices
9x10 cm2 on plates 1-4
6x5 cm² on the plates 5-57General Scan :
BL044
9/16
42 vertices are 2-prongs 1 vertex is 5-prongs
BL044
10/16
To validate the vertices :
Match between SFT predictions and the 2 most downstream plates
The analysis is still in progress.
t.eTY
BL044 : Brick-SFT matching
11/16
90cm² general scan on the first three plates
298 tracks matched with SFT
DB-driven ScanBack in progress.
BL088 : Brick-SFT matching
12/16
BL044
General Scan of the brick completed (6x5 cm2 area)
SFT-brick connection successful
Vertex validation in progress
BL088
Scan Back of SFT predictions in progress
Peanut summary
13/
As decided at the June PB, 20 boxes have been produced. Now the production has been stopped in order to:1) validate them from the technical point of view2) validate them from the scanning point of view
1) They have been used in the Nov test at LNGS (14 bricks exposed at the cosmic ray pit)
2) A special test was performed in October in order to guarantee the CSD-Brick mechanical compatibility (for transport BMSX ray site)- 4.75 day exposure inside the CR pit (outside the shielding)- exposure interrupted to stress the brick and the box (many opening-closing cycles, shakings etc.)- results:
a) unique align pattern: bivariate gaussian with x~y~30 mrad
b) integral number of tracks compatible with a 4.75 day exposure (after
correction for efficiency ~ 85%)
C. R. exposure: Brick Transportation Unit
14/
The internal shielding is still pending to be validated: Oct run would be useful also for this;
Nevertheless, in the Nov test 14 bricks have been exposed in the cosmic ray pit in different experimental conditions: 10 in the internal shielding 3 outside the internal shielding 1 outside the internal shielding and near the roof
(as in the 2003 exposure – where we measured a penetrating component)
We would ask to the institutions involved in the test to provide a measurement of this quantity: basetrack density as a function of the emulsion
sheet (after quality cut and inside a 400 mrad cone)
C. R. exposure: Internal Shielding
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CS1
CS2
PL 60
PL 1
z = 300m
z ≈ 4800m
Found 18 base-tracks compatible with 8 LNGS trackswithin 200 m and 0.03*(1+3*|slope|) rad
Scanning of plate 60 in Bologna
Fog: 15 / 1000 m3
Many electrons
Microtracks / View: ~1600
BaseTracks / View: ~400
BaseTracks / View after quality cut*: ~50
*CHI2< 0.66*PULS-9
CS-brick 3000681 connectionLNGS scanning of CS doublet provided 11 tracks
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CS-brick 3000681 connection
Search for tracks without taking into account the result of the automatic scanning
Found 6 tracks
Fine alignment of CS doublet and PL60
Search for the “missing” tracks found 3 more
Final manual check result: 9 tracks found (2 LNGS tracks not found)
Manual vs automatic scan:only 5 out of 8 tracks found with the automatic system are good
Manual Check
Warning: it seems that the x-ray beams for marking is somewhat divergent