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OPAL Experiment Seen from Lead Glass Counters

OPAL Experiment Seen from Lead Glass Counters. Tomio Kobayashi ICEPP, Univ. of Tokyo. OPAL “Reunion” 21. Oct. 2010. Original OPAL Design a la JADE (LOI, Jan.1982). LEPC Advice on LG: parallel geometry → pointing geometry. Semi-Pointing Geometry. Performance is good,

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OPAL Experiment Seen from Lead Glass Counters

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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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