2. Vacuum, Surfaces & Coatings Group Technology Department Cleanness of the 3-4 cold beam lines Outline:  History: Status of 2009 cleaning  Foreseen and additional activities on cold beam lines.  Inspection and cleaning activities in sector 3-4 during LS1  Activity sequence  Procedure  Schedule  Conclusion 2 August 2013 C. Garion2 C. Garion on behalf of TE/VSC with materials of Vincent Baglin

3. Vacuum, Surfaces & Coatings Group Technology Department History: Beam vacuum line cleanness in sector 3-4 after incident 2 August 2013 C. Garion3 LSS3 LSS4 V1V2V1V2Total Ok543926 %18 %22 % MLI12412958 %61 %59 % Soot354516 %21 %19 % Total213 100 % MLI Contamination types: MLI Soot (Debris) Contamination distribution: Soot

4. Vacuum, Surfaces & Coatings Group Technology Department History: Cleaning methods after 3-4 incident (1) 2 August 2013 C. Garion4 Foam plugs for the soot:  Use of two plugs for horizontal and vertical parts of the beam screen  Use of alcohol-wetted and dry foam plugs  Up to 50 passages in each direction with wet foam plug and up to 15 passages with dry plug Example of C19R3.V2

5. Vacuum, Surfaces & Coatings Group Technology Department 2 August 2013 C. Garion5 History: Cleaning methods after 3-4 incident (2) Air flux for the MLI:  1st step: automatic pumping/venting  A cycle : 20 s pumping, 18 s plateau, 2 second vent  The pressure is reduced from 1 atm to 0.8 atm in 2 s (to be compared to the arc pump down of 200 mbar/h)  Apply this process for 30 min (40 pumping/venting cycles)  2 nd step: aspiration with local pertubation controlled by endoscope  nozzle blows filtered air, the MLI residues left behind the beam screen and the RF fingers are directed towards the beam aperture where they are aspired away.  Time : 5 min per PIM, speed of 3 m/min along the beam screen

6. Vacuum, Surfaces & Coatings Group Technology Department 2 August 2013 C. Garion6 History: cleanness after 3-4 incident Acceptance criteria: After discussion with AB-ABP and following Chamonix it was agreed with the management that : -1 fibre per half-cell -2 debris (MLI or other less than 1 mm 2 ) per magnet can be left in the beam tube after the cleaning process ! Few pictures of non-conformities: Q29L4 V1 Q34R3 V1 A32L4 V1

7. Vacuum, Surfaces & Coatings Group Technology Department Foreseen activities on cold beam lines (at the LS1 start). 2 August 2013 C. Garion7 4 Magnet exchanges Damaged bellows (PIM cutting to be confirmed at opening: not to be changed)  Point 3 Point 4  «standard» endoscopy (54 m in one direction per line)

8. Vacuum, Surfaces & Coatings Group Technology Department Foreseen and additional activities on cold beam lines. 2 August 2013 C. Garion8 New opening: QBBI.A14R3 (V2); QBBI.A20R3 (V2)  Point 3  2 additional openings are asked for inspection and investigation (Endoscopy).  Extended endoscopies.  Air flux for MLI removal Point 4 

9. Vacuum, Surfaces & Coatings Group Technology Department Inspections and cleaning activities in sector 3-4 during LS1 (1) 2 August 2013 C. Garion9 Sequence:  Point 3 Point 4  Cleaning by pulsed air flow (24h) toward point 4 Analysis and decision Endoscopy Cleaning by pulsed air flow Prudent endoscopy*  analysis Cleaning by pulsed air flow * Prudent endoscopy: if too many debris are observed, the endoscopy will be stopped and the cleaning carried out endoscopy.

10. Vacuum, Surfaces & Coatings Group Technology Department Inspections and cleaning activities in sector 3-4 during LS1 (2) 2 August 2013 C. Garion10 Same procedure as in 2009 will be applied (EDMS 989454) Same material, available

11. Vacuum, Surfaces & Coatings Group Technology Department Schedule of inspection and cleaning activities in 3-4 2 August 2013 C. Garion11 All interconnections and beam vacuum lines related to these activities in sector 3-4 are opened including the QBBI.A14R3 and QBBI.A20R3 VSC activities in parallel with SIT reconnection work. No closure of the beam vacuum lines (PIM installation before the end of the activity) Start of VSC activities beginning of August (8 August) ~ 3 weeks in total From point 4 first (to avoid interaction with optical fibre activity, t.b.c.); Mid august from point 3

12. Vacuum, Surfaces & Coatings Group Technology Department Conclusion 2 August 2013 C. Garion12 A scenario of inspection and cleaning of the cold vacuum beam lines in sector 3-4 is proposed. The additional work for the SMACC team has been minimized while providing a maximum of informations and efficiency of the cleaning. A cleaning of the 2 beam vacuum lines will be carried out based on pulsed air flow. Procedure and tooling have already been applied in 2009.

13. Vacuum, Surfaces & Coatings Group Technology Department Back up slides 2 August 2013 C. Garion13 Cleanness after incident PIM status Interconnection status

14. Vacuum, Surfaces & Coatings Group Technology Department UFO activity 2 August 2013 C. Garion14 Courtesy of T. Baer Source probably identified - ongoing To be inspected, most likely a consequence of 3-4 incident Inspected and no cause found

15. Vacuum, Surfaces & Coatings Group Technology Department Beam screens with soot in tunnel : B19R3 B19R3.V2 before cleanning entrancemid end After cleanning V. Baglin Chamonix 2009

16. Vacuum, Surfaces & Coatings Group Technology Department Beam screens with soot in tunnel : C19R3 C19R3.V2 before cleanning entrancemid end After cleanning V. Baglin Chamonix 2009

17. Vacuum, Surfaces & Coatings Group Technology Department RF ball test 2 August 2013 C. Garion17 RF ball after test of V1 in sector 3-4: Few MLI chips found