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Report on PISA progress ~Small Addendum~

Report on PISA progress ~Small Addendum~. Takao Sakaguchi. Recall the Geometry nesting. Maxim is aware of a problem Amount of photon conversion did not change at all when Maxim added FEM to HBD Sound somewhat bigger problem Geometry nest in HBD:

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Report on PISA progress ~Small Addendum~

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  1. Report on PISA progress~Small Addendum~ Takao Sakaguchi

  2. Recall the Geometry nesting • Maxim is aware of a problem • Amount of photon conversion did not change at all when Maxim added FEM to HBD • Sound somewhat bigger problem • Geometry nest in HBD: • HALL (PHENIX)  HBDG (Gas Volume)  TISO (HBD Mother frame) • Most of HBD components (HV panel, GEM, etc.) attribute under “TISO” • I added shade under “TISO”, but no particle including photon interact with the shade • A solution found by Maxim was to expand “GSM”(Gas volume include CsI of Top GEM and Mesh) that were already defined, and assign shade under GSM. • Maxim confirmed that the shade absorbs cherenkov photons

  3. Electrons to PISA • Threw pT=2GeV/c electrons into • |y|<0.5, and |-0.075|<0.075, Covers W4. • Histograms number of p.e. as a function of electron hit positions • Counted cherenkov photons as a function of hit position of electrons. • Z bin: 3cm from -30 to 30cm, Phi bin: ~ 4 deg. • In the following slides, I show four (+one) cases • 1, No Shade. PISA as is in PHENIX official library • 2, In case of expanding “GSM” region (so to include shade in it), but no shade yet (slashed this time) • 3, Mylar shade in PISA (in GSM) (2.5cm*2.5cm*2.5cm) • 4, “Gas” shade in PISA (in GSM) (slashed this time) • Suggested by Sasha a week ago. • 5, Mylar shade in PISA (in GSM) (1cm*1cm*1cm) (added this time) • Sorry, statistics is half of other cases..

  4. Case 1: No Shade (Integrated) • Integrated over all the events • Reasonable numbers • Tail may come from electrons hit in edge

  5. Case 1: No Shade (phi-slicing) • 4deg. Phi slicing (from -6 to 34 deg.) • Detector sits between 0 to 27 deg.. • Z: -30-30cm. 0 means middle of the detector • Y-axis: Number of photons per events

  6. Case 1: No Shade (z-slicing) • 3cm z slicing (from -30 to 30 deg.) • phi: -6 to 34deg. “13.5 deg” is middle of a GEM • Y-axis: Number of photons per events

  7. Case 3: Mylar Shade (2.5cm) In (Integrated) • Integrated over all the events • Significant decrease of photons! • Tail may come from electrons hit in edge

  8. Case 3: Mylar Shade(2.5cm) In (phi-slicing) • Trend kept, but overall decreasing

  9. Case 3: Mylar shade(2.5cm) in (z-slicing) • Trend kept (minimum at middle)..

  10. Case 5: Mylar Shade(1cm) In (Integrated) • Integrated over all the events • Peak position is same as 2.5cm shade • Width is much smaller!

  11. Case 5: Mylar Shade(1cm) In (phi-slicing) • Trend kept, but overall decreasing

  12. Case 5: Mylar shade(1cm) in (z-slicing) • Trend kept (minimum at middle)..

  13. A Remark • Geometrically, as long as ratio of spacing to height holds, loss is same • It would be nice to check the width of photon distributions • It affects to rejection power

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