Brick manipulation report

1. Brick manipulation report D.Duchesneau LAPP, Annecy • BMS machines status • Black CS extraction status • CNGS brick candidate extraction and BMS planning for 2009 OPERA General Meeting Ankara, April 1st , 2009

2. Some numbers for ‘fun’: BMS Machines: • 2007: 80000 bricks have been inserted in the target in 11 months => 1700 /week • 2008: • 70000 bricks have been inserted in the target in 6 months => 2900 /week • 19500 bricks have been extracted and reinserted in the target in 6 months time => 800 /week • 2009: 14000 bricks are extracted and reinserted in the target in 3 months => 1170 /week BMS VV have travelled about the distance Roma-L’Aquila: 50 km in 2008 and already 70 km in 2009 (diameter of wheels: 40mm) Since 2008: BMS machines have moved 894 tons of bricks in the target with great care: 28 motors and 100 sensors are active all the time and mechanics and actuators are working very hardly with challenging reliability.

3. BMS Machines: hardware status • The BMS maintenance + repairs are programmed from Monday April 27th to May 8th 2009. • a LAPP team will work to address the following items: • Preventive maintenance after black CS replacement • total revision of the BMS bridge on the Rock Side • Replacement of some profibus cables on the Rock side (Y and Z chains) • Try to correct the geometry of the Rock side platform due to the deformation • Replace and readjust the guiding of the portico along the large Z movement • Z Navig driving belt tension system analysis on corridor side • Revision of the drums and the rotating parts of the cage • Recalibration of the whole BMS setups The work should be carefully organised such that the other activities are not interfering We need at least 3 days (from May 6th to May 8th to run without interference in order to reoptimise the BMS for the new Run

4. Black CS treatment status

5. Black CS extraction reminder: • 2 groups have to be extracted: • The first 13000 bricks produced by the BAM for which there was no hole in the CS envelop: they are considered as the first 13000 bricks loaded in the detector (Brick Id < 14400)= group A • There are additional 4000 bricks for which there was a hole but stored during long time under vacuum. Those brick positions are not so sharply defined as in the first category. But looking at the CS fog data we isolated the group B: 34000< Id < 37500 (about 3500 bricks) F O G A B Total=16500 bricks but 1000 are spread randomly in the detector in rows with < 13 black CS CS Identifier

6. Black CS row localisation in the detector (Side views of the target) as of March 30th 2009: remains 157 rows (blue squares) = 4082 bricks to extract as of March 9th 2009: remains 289 rows (blue squares) = 7500 bricks to extract SM1 RS SM1 CS Group B: 0103400< Id < 01037500 129 rows Group A: Id < 01014400 485 rows

7. Black CS extraction strategy: • To be careful: some rows contain good bricks or bricks which should not be treated: (0.3% candidate bricks and 0.6% not high fog bricks) : both types will be reinserted in the detector • However the priority are given according to the rows where there is a maximum of CS to replace. • We use a BMM tool interface to the DB to do the bookkeeping of the extracted bricks A dedicated activity has been installed beginning of this year and made operational in Hall C since Feb 2nd 2009

8. Slide from David Biare 8 Global setting-up (in hall C) Work stations point Storage pallets point Loading unloading drums point Security corridor always free

9. Slide from David Biare Work stations point Bricks NOT done Bricks done Linear stream There are 2work stations

10. Work station control point Activities on the working tables in Hall C: CS & Skates replacement Dimensions control BMM recording

11. Black CS replacement operation in Hall C (from David) Constant and very demanding human effort: we are following a good slope but keep motivation!

12. BMS performances ‘theoretical’ upper limit achievable for the BMS if there is no major hardware failure during 2 shifts/day: BMS Insertion max. rate: 900 bricks/day  4 drums/day BMS Extraction max. rate: 2/3 of insert rate = 600 bricks/day • However several unrelated show stoppers occurred: • Tunnel closure (-15 hours), • Snow storms (-5 hours) , • OPERA DB Oracle access problem (-8 hours), • etc… ‘Average’ rate achieved for the BMS during 2 shifts/day including all sort of hardware and Gran Sasso related failures since Feb 2nd : BMS Insertion average rate: 3 drums/day (max=3.72) (eff = 75%) BMS Extraction average rate: = 586 bricks/day (eff = 98%)

13. BMS performances and schedule Summary for the last 2 months (Feb 2nd-March 30th): Black CS extraction Expected: 10800achieved: 11902 Brick reinsertion: Expected: 7650 achieved: 6084 CNGS extraction: Expected: 260 achieved: 231 Goals for the period (Feb 2nd-April 24th): Black CS extraction Expected: 13700originally: 15000 Brick reinsertion: Expected: 14900 originally: 22000 CNGS extraction: Expected: 460 originally: 260 BMS maintenance and repair April 27th – May 8th Activities foreseen from May 11th – May 23rd Brick reinsertion: Expected: 2200 (includes last BAM production) CNGS extraction: Expected: 100 (4days) Start CNGS 2009 run extraction from May 25th

14. CNGS candidate extraction status

15. CNGS Brick candidate extractions: 1906 bricks extracted up to March 27th 2009 (for 1690 events!). Those achievements were not done without pain: • BMS Extraction suffers from bad skates + glue + lost/destroyed CS cover • Unexpected and damaging LNGS power cuts on BMS systems and hardware + loss of BMM DB… • Hardware failures: motors, servo-control, vehicle, crashes due to external factors • 4 rows with candidate bricks inside are blocked. and are not yet recovered and no hope to easily recover them CNGS extraction efficiency is then: 99.80 ± 0.10 % However during the black CS extraction in the worst rows with the bad skates only we have 16 rows with blocked bricks! It is why the maximum exchange of black CS would have been the best option for the 5 coming years

16. CNGS Brick candidate extractions: • At the Exec meeting of Feb. 13th Dario summarised the need for additional extractions • Bricks still to be extracted: (first) 76+70+60+25 • (2nd estimated with (second, first extracted) 360 • 40% ineff on 1st) (second, first not extracted) 90 • Total 680 • It was asked to modify the planning during the black CS extraction period to include more CNGS extraction which we did and went from 5 to 10.5 days of extraction. It was corresponding to double the rate and should end up with 460 extracted bricks up to April 24th 2009 among the 680 possible requests However the drawback was the reduction of the number of black CS to be treated of about 2000 => 14000 instead of 16000 treatable At the beginning of 2009 run: a maximum of 100 bricks may still to be extracted if we base on the above numbers

17. 2009 2008 We see clearly the CNGS extraction activity we included during the black CS treatment

18. We extract more but this gap increases! # places on shelves up to March. 28th Shielded area Storage capacity: 1000 bricks

19. Brick Handling and new BMM development: • Brick to Brick connection management actions have been implemented this week in the BMM software. • The knowledge of the B2B characteristic is known at the time of the brick extraction request retrieved from the central database. • For those bricks the flow will be: • CS-ray is done • CS is developped • when the brick arrives in the shielded area, its state will go directly to waiting for X-ray if put on a shelf

20. The END