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OPERA bricks development @ LNGS

OPERA bricks development @ LNGS. G.Rosa, C.Sirignano. Emulsion Workshop, 7-9 December 2006. Development facility commissioning. Last October and November several activities took place at LNGS, every week at least 5 people (Bari, Bologna, Roma and Salerno) were

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OPERA bricks development @ LNGS

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  1. OPERA bricks development @ LNGS G.Rosa, C.Sirignano Emulsion Workshop, 7-9 December 2006

  2. Development facility commissioning Last October and November several activities took place at LNGS, every week at least 5 people (Bari, Bologna, Roma and Salerno) were on shift in order to be ready to handle real bricks. • Dark room set up (safe lights) • Climatization tuning • Develop tanks tests and cleaning (water + chemicals) • Automatic disposal of chemicals • Gridding machine installation

  3. Shifts Shifters

  4. 2 chains ready since November 3rd to be used in manual mode • Chemical preparation - Manual • Development - Manual • Chemical disposal - Automatic First development done using the first chain (Oct 25 th) 1 chain commissioned November 2nd (10 bricks successfully developed)

  5. Development quality • 10 bricks from BAM (wrong piling or incorrect wrapping) • (1 developed in CS facility as reference) • OPERA like procedure (transportation, labeling) • Standard develop procedure and solution refresh rate • Emulsion quality monitoring (trasparency and fog count)

  6. Film transparency is good and no degradation observed up to now (yellowing or abnormal thickness). Two more months at least are needed to be sure that films will not turn to yellow, anyway no dramatic effects detected. Films having hole (first shipment)

  7. Status Transfer of chemicals from preparation tanks Fresh water in 250 l 250 l 250 l 750 l 500 l 250 l 750 l Dev Stop Clean Wash 1 Wash 2 Fix Glyc 30 l 30 l 30 l 30 l 45 l 45 l 45 l 300 l Waste water Waste 2 Waste 3 Waste 1

  8. 14 bricks were developed using the standard procedure 9 bricks were used for cosmic test 5 bricks extracted from the detector OPERA bricks development (Nov 2006) We used for cosmic test some bricks that BAM tagged as “out of spec” because of wrong Z dimension; that means they had double lead layers or double emulsion layers. CS were developed in the underground facility and ECC films + VETO films added during the cosmic exposure were developed outside.

  9. CS films measurements We carried on a single development for all CS films and related FD are the following: FD same as TTCS sample developed in August TTCS same sample ???

  10. In order to study more in details fog-up problem on double refreshed films a new exposure at BTF (Frascati) is planned fro the next week and films will be developed at LNGS starting from Dec 20th.

  11. ECC films measurements We carried on a single development for ECC and VETO films: VETO films FD is 7.5 + 0.5 . First shipment + hole

  12. 824 2nd shipment 315 1st shipment

  13. Develop order Cosmic test bricks

  14. Extracted bricks

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