WG-3 summary CS scanning

People O.SatoNagoya Y.NonoyamaNagoya S.MiyamotoNagoya J.YoshidaNagoya T.FukudaNagoya T.NakanoNagoya S.AokiKobe Luigi Salvatore EspositoLNGS Giovanni DeLellisNapoli Artem ChukanovDubna Yury GornushkinDubna Cazes AntoineINFN Yves DeclaisLyon Carlo GustavinoLNGS Rosa Anna Fini Bari

Discussed Compton(beta ray) alignment TT display tools CS and ECC wrong association? CS feedback method request to Extract/ Development

Neutrino events 38 events 19 Euro : 19 NGY Not found cs : High Fog(LNGS),3(NGY) Brick connect 11(Euro), 11(NGY) Vertex confirmed 8(Euro), 7(NGY )

Detection of position displacement peak of beta-ray -Take all combination of dx in ~+-100um - Angle allowance is FREE. 2.1um 1.8um

Application for the OPERA CSD Alignment accuracy is less than 1um. Effective to reject BG tracks very much. Samples : Cosmic run events CSDs Neutrino events CSDs

40 um 20um in delta position space Plot vector as the center of peak in each unit area on the film map -> Relative Distortion map.

Continual area ratio of CSDs sucessful

The reason of below 90% Not enough beta-rays to align Peak is detected, but double Large Gap exists

Examples, Double Peak

Examples, Large Gap is Detected.

Summary Beta-ray alignment was applied to real OPERA Experiment. The number of beta-ray for alignment is enough. We estimated mechanical tightness. 26/32 CSDs is aligned successfully. 5/32 CSDs have Double Peaks, these are recoverable by detection both (We have 2 alignments, BG Doublet tracks become twice). 1/32 CSD has large (more than 100um) gap, we can detect it. We continue the study of these 6 events.

Standerd Doublet Selection:A Hold 4 /4 Position difference <20um (Xray alignment) Angle difference15mrad Pulse height Vol.>4 && 200< for All microtracks Reject noise near edge Reject noise near Xraymark

Track Found Track Found Track Found Track Found Track Found Track Found Track Found Track Found Track Found Track Found Track Found Track Found Track Found Track Found Track Found Track Found Track Found

Penetrating track32 straight track28 Curving Track4 Chance coincidence66

Xray alignment

Βray alignment

TT display tools

Alignment correction is important Brick position for display Mouse based track fitting helps for complicated events, NC etc.

CS and ECC wrong association?

Event , brick 11847

Proposal Change CS Xray mark pattern event by events

CS feedback method Request to extract/ development Easy to access DB based (user interface ? WEB) Working group(O.Sato,C.Bozza,L.Esposito) should start to realize this. BMM

END

Some Samples

At first, division of area (5mm x 5mm)

Estimation of successful area Continuity check is suitable which beta-ray alignment is success or not because distortion should be continual. -Check the difference of vector between adjacent area. -For example, d(dX)(a,b)=dX b -dX a - if d(dX) =2 adjacent areas, “a” is defined as continual(successful). b a c d e