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SVD Numbering Scheme

SVD Numbering Scheme. Markus Friedl ( HEPHY Vienna). SVD Meeting. Introduction. The Belle II numbering scheme was a topic at last week‘s IDM Hara- san and Tsuboyama-san explained the SVD2 scheme Generally, the wish of a global numbering concept was expressed

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SVD Numbering Scheme

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  1. SVD NumberingScheme Markus Friedl (HEPHY Vienna) SVD Meeting

  2. Introduction • The Belle II numberingscheme was a topicat last week‘s IDM • Hara-sanandTsuboyama-sanexplainedthe SVD2 scheme • Generally, thewishof a global numberingconcept was expressed • Ushiroda-sandistributedBelle II Coordinate System and Numbering Scheme document draft yesterday • Same scheme as SVD2 Markus Friedl (HEPHY Vienna)

  3. Hara-san Markus Friedl (HEPHY Vienna)

  4. My Opinion • Wearefreetochooseanynumberingschemeforlayers, laddersandsensors (thoseare all independent) • 2. Layers: I proposed 3…6 (insideto outside, increasing r) toavoidconfusionwith PXD 4 (Hara-san: 0…3) • 3. Ladderswithinonelayer: not definedyet, noproblemtofollow SVD2 scheme (inreasing) 4 • 4. Numbering in z from +z towards –z: not definedyet, but seems non-natural (intuitively, I wouldexpectincrasing z) 8 … but let‘swait – I maychangemymindlater;-) • 4= consistentwith Hara-san • 8= disagreementwith Hara-san Markus Friedl (HEPHY Vienna)

  5. Comparisonwith Simulation • Christian Oswald (previouslyPrague, now Bonn) toldushisnumberingschemefor SVD simulation: • 2. Layers: 3…6 (insideto outside) 4 • 3. Couldn‘tsay, but presumably OK 4 • 4. Numberingtowards positive z 8 • Weconcludethat Christian apparentlyusesthe same approach (numberingincreasingwithcoordinates) which I wouldexpect • Why z isopposite: numberingdoes not follow z, but  •  is 0 at +z and at -z Markus Friedl (HEPHY Vienna)

  6. Hardware Constraints • The sensorreadoutdirectionisdefinedbythe APV25 0 127 APV25 Markus Friedl (HEPHY Vienna)

  7. OrigamiSensor (n-side) • n-side (facing CDC), seenfrom outside (CDC) Markus Friedl (HEPHY Vienna)

  8. OrigamiSensor (p-side) • p-side (facing beam pipe), seenfrom outside (CDC) • Strips areactuallybehinddrawing plane Markus Friedl (HEPHY Vienna)

  9. WedgeSensor (n-side) • n-side (facing CDC), seenfrom outside (CDC) 127 #3 0 127 #2 0 127 #1 0 127 #0 0 0 511 Markus Friedl (HEPHY Vienna)

  10. WedgeSensor (p-side) • p-side (facing beam pipe), seenfrom outside (CDC) • Strips and hybrid areactuallybehinddrawing plane 0 0 #0 127 #1 #2 #3 #4 0 #5 127 767 Markus Friedl (HEPHY Vienna)

  11. RectangularEdge Sensor (n-side) • n-side (facing CDC), seenfrom outside (CDC) Markus Friedl (HEPHY Vienna)

  12. Rectangular Edge Sensor (p-side) • p-side (facing beam pipe), seenfrom outside (CDC) • Strips and hybrid areactuallybehinddrawing plane Markus Friedl (HEPHY Vienna)

  13. FullLadder – EverythingTogether • Bothsidesseenfrom outside – n-sidethroughsensors • Almostentirelycompatiblewith Hara-sanscheme! 4 8 4 Thereisnohardwaresolutionhere, wehavetoflip in software 4 4 4 Markus Friedl (HEPHY Vienna)

  14. Summary • Global Belle II numberingschemeproposed • LocalstripnumberingisdeterminedbytheAPV25 • Bychance, the APV25 stripnumbering in ourconfigurationisalmostfullycompatiblewiththeproposednumberingscheme! • Only p-sideofrectangularedgesensorsneedtobeflippedatsomepoint in software • Simulationshouldflip z countingdirectionandmakesurefstartsat (x,y,z)=(1,0,0) accordingtothe B2 Note draft • ShallwerenameSVD layers(presently 3,4,5,6) to 0,1,2,3 ? (Couldcreatesomeconfusion…) Markus Friedl (HEPHY Vienna)

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