Emulsion quality WG2 report

1
Emulsion quality WG2 report
Thanks to all the OPERA colleagues who are
engaged on handling and developing emulsion.
2
Problems reported on films shipped to Nagoya
Develop
Sticking to the next (4 plates)
Due to holders mechanical problems and human
mistakes. It is strictly needed to check develop
stainless holders and film insertion into
holders.
Dust
Due to old solutions (stop clean), human mistake
Thickening
Water (glycerin solution) drops (by lack of
driwel)
3
Chemicals control
We agreed on the following quality checks on
fresh chemicals
Develop PH ORP (at every tank new filling)
Stop Clean PH transparecy ( to avoid dust
on films)
Fix PH PAg
Thickner density driwell (Y/N) using fast
film immersion
Each test must be performed after preparation and
usage
4
Film quality check after development

• In order to have a fast and reliable cross-check
  between film quality and
• development procedure everyday at least 10 films
  will be checked.
• We need to investigate
• Fog density
• Thickness
• Image quality
• Grain density
• The estimated time needed for this job is 2
  hours.
• In each develop team at least one person will be
  trained for this job.

5
Next run activty

• Develop team duties
• ON THE GROUND
• Chemicals preparation
• Chemicals quality check
• Brick opening
• Brick unpiling
• Optical marking
• Develop holders filling
• Development control
• Film drying check
• Film quality check
• Film preparation for shipment
• Lab cleaning
• UNDERGROUND
• CS optical marking
• CS development

Shift A ( 4 people Chemist)
Shift B ( 2 ON 2 UNDER people)
6
Next run activty

• Team coordinator duties
• Chemicals preparation supervision
• Chemicals quality check supervision
• Chemicals disposal scheduling
• Brick opening and development scheduling and
  supervision
• Data storage and DB supervision
• Film quality check data analysis

LNGS chemical service

• Team profile
• Team coordinator ( 1 week full day) OPERA
  physicist
• Shift A B coordinator ( 1 week 8 h/day)
  OPERA physicist/ technician
• 3 3 external man power

Remark 25 - 45 bricks/day