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OPAL Experiment: Lead Glass Counters Tomio Kobayashi

Detailed account of the OPAL experiment seen through lead glass counters development, challenges faced, and successful implementation. Includes historical and technical insights from University of Tokyo.

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OPAL Experiment: Lead Glass Counters Tomio Kobayashi

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  1. OPAL Experiment Seen from Lead Glass Counters Tomio Kobayashi ICEPP, Univ.of Tokyo OPAL “Reunion” 21. Oct. 2010

  2. Original OPAL Design a laJADE (LOI, Jan.1982) LEPC Advice on LG: parallel geometry → pointing geometry

  3. Semi-Pointing Geometry Performance is good, but construction is difficult and expensive.

  4. … while EE could stay in parallel geometry

  5. Main Parts of an EB LG Counter × 9440 pcs SF57 (Schott) R2238 (Hamamatsu)

  6. Assembly Line of LG Modules B.192

  7. Many Ideas and Inventions … 10 sec×10,000 pcs = 105 sec → practically 1 week of work

  8. Combined Beam Test with “Chicago Stage” in X5 Beam Line

  9. 5 Different LG Modules and “Mitsui Stage”

  10. “Incident” (July 1986)

  11. Beam Calibration with “Mitsui Stage” (1986 – 1988) X5 beam line

  12. Installation of HR’s in OPAL Pit with “Mitsui Mounting Device”

  13. Only 5 counters exchanged between the beam calibration and the installation

  14. All of them(9440 pcs) worked so well from the start(1989) till the end(2000) Bhabha 2000 ECM = 206 GeV (R3F) Gain calibration 2000 (R3F) by S.Asai

  15. “The Secret”

  16. “Historical” Reconciliation (Oct.2004) … with Mr. Hakamada (Director of Sales, Hamamatsu Photonics)

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