1. Infrastructure activities planned on ATLAS during YETS 2015 Thanks to all the experts who contributed Bruno Saint Sulpice, Denis Dumas, Serge Deleval, Caroline Fabre, Nicolas Broca, Sylvia Grau, Dirk Mergelkuhl

2. Content M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 2015  ATLAS overview  Electricity  Cooling and Ventilation  Cryogenics  Access and Safety Systems  Vacuum  Survey  Transport 2

3. ATLAS overview M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 2015 Many maintenance and consolidation activities are foreseen on the experiment. Some of them require access to inner parts of the Detector. Priorities have been defined to stay within the YETS duration (12 weeks) 1 2 3 4 On side C, Standard Opening 5 6 On side A, Forward region ⑤Repair of MDT gas leak (EO & BW) ⑥PMTs replacement on LUCID ⑦4 TGC1 chambers to be replaced on Big Wheels 7 ① ECT-C vacuum bellows ②5 Tile drawer repairs ③2 CSC chambers to be dismounted and repaired ④1 TGC1 chamber to be replaced on Big Wheels 3

4. What does it entail ? M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 2015 The 2 pits will be opened and shielding lifted up to surface, then heavy systems (End Cap Toroid, Small Wheel, End Cap Calorimeter) will be moved  Access to UX15 strongly disrupted on week 51  Team organized in 2 shifts : 5h – 20h30,  access to underground areas must not be limited weeks 51, 52, 1 Test secours accepted on Dec. 18 th (short disruption) Request to move the Safety test @P1 on week 53 ATLAS will be mainly stopped at the beginning of the Technical stop But needs to wake up progressively starting NO LATER than beginning of February Disruptive interventions shall be completed by end of January 2016 The full picture of the required interventions must be presented and discussed as early as possible, and in any case before the YETS starts All interventions presented in the next slides are extremely new (10 days max.), they have not yet been presented to ATLAS systems, neither discussed. As a consequence, plans are very preliminary and most of them (if not all of them) will have to be confirmed. 4

5. AFP installation M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 20155 AFP is made a double arm detector – In YETS 2015 only one arm will be installed at C6R1 – Installation will be pursued in EYETS (2017) Each detector consists of 2 Stations containing Roman Pots placed at 205 m and 217 m from IP o secondary vacuum o air cooling Integration in tunnel in collaboration with EN-MEF Cabling Drilling of holes for the AFP supports Installation of the stations planned by the end of the YETS after commissioning of equipment on surface Modify Exterior vacuum chamber between Q5 and Q6 2 VPI 2 BLM, 1-2 BPM

6. AFP installation (2015-2016) M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 20156 Install cables for trigger in the service tunnel for both arms (04/01 – 17/02) o After discussion with surveyors agreed to install this year both sides not to duplicate the dismounting of the surveyors equipment o This work will entail the passage of the cable from the LHC tunnel to the surveyors gallery o Need to check tightness of sealing after installation o Cable installation will be done in collaboration with EN-MEF (Gianluca Canale) Install cables for services from Stations to US15 (not yet clear if services from both ARM will be installed in 2016) o This work will be done in collaboration with EN-MEF o The cabling from US15 to USA15 (in the UX15 cavern) can be done by ATLAS team Install patch panels/crates/racks at 205 m, 217 m, and 212 m Controls, Vacuum and motorization of the roman pots done in collaboration with PH-DT o Commissioning of motorization, interlocks, and detectors

7. Electricity (EN-EL) M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 2015 InterventionsConsequencesCompensatory measuresDurationTentative schedule Test AUG LHC1No power, no access UPS swap to batteries and Diesel 1 day 25/01/2016 TBC WE prefered Test AUG LHC2 Cut of ventilation racks US15 – possible DSS alarms 1 day08/02/2016 ?? Test auto transfer ATLAS limited at 240 A 1 day on WE with no access Switch off all what can be4 days No later than end of January Test secours No general power, no access UPS swap to batteries and Diesel 10 min.18/12/2015 Addition of 1 column in UIAC120 for EN/CV No impact from power supply But still to be investigated on control side : ventilation stop may happen Experts will be on site, ready to intervene 2 days To de defined, no strong issue (?) EQD2/1H : Addition of 1 column for TE/CRG Power cut of cryogenics (MR, Shield compressor) 2 days 15-16/12/20 15 or 25- 26/01/2016 Modifications on EXD4/15A and EBD1/15A Impact on Atlas Magnets to be cleared up Work asked by PH-DT (magnet control) To be confirmed 7

8. Electricity (EN-EL) M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 2015 InterventionsConsequencesCompensatory measuresDuration Tentative schedule Replacement of breakers with contactors on EXD1/15X and EXD2/15X (+ modification PLC) Several systems affected: BWs, - commissioning avec DCS Switch off related systems2x4 days To be defined Modifications on EOD8/15A Impact on IBL IBL could be re-powered provisionally 2 days + commissioning To be defined Modification EXD2/1DX TDAQ May be extended to all switchboards EXDi/1DX (x6) Racks to be switched off2 days To be defined Maintenance of all ATLAS UPS * No protection in case of glitch or short power cut Repowering thanks to normal network 6 daysTo be defined Transformer maintenance EMD305/1DX no power to TDAQ All EXDi/1DX are cut 4h To be defined 48V maintenanceExpected to be transparent? To be defined * Critical UPS in USA15 will stay on UPS 8

9. Cooling and Ventilation (EN-CV) M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 2015 InterventionsConsequencesCompensatory measuresDurationTentative schedule SF1 maintenance No primary water Use of SPS loop : cooling power about 1.3 MW 5 weeks16 dec - 20 jan SUX1 maintenance No Mixed water, no chilled water Chiller CNGS (700 kW) No backup on pump, electrical power cut must be avoided 4 weeks  15/01 To be better defined US15 maintenance No Mixed water, no chilled water Chiller CNGS (700 kW) No backup on pump, electrical power cut must be avoided 4 weeks  15/01 To be better defined USA15 maintenance No Mixed water, no chilled water Chiller CNGS (700 kW) No backup on pump, electrical power cut must be avoided 4 weeks  15/01 To be better defined Ventilation maintenance No stop, redundancy affected, perturbation expected on temperature, humidity and pressure None ? Parallel to cooling 9

10. Cooling and Ventilation (EN-CV) M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 2015 InterventionsConsequencesCompensatory measuresDurationTentative schedule ALFA cooled cables (RR13 & RR17) Only on ALFANone ? ? Installation of by-pass on ATLAS US15 mixed water Empty US15 racks ? // cooling US15 Qualification of compressed air vessel in SH1 Stop of compressor needed Cut inert gas in USA15 racks Cryo --> back-up rack of compressed air 1 day 15/12/2015 (agreed with TE/CRG) SF1 : repair of silencers ? During SF1 stop Modification of the firefighting water circuit in SUX1 Cut back-up in SDX1 Stop He liquefier (back-up only) None (  short duration)1 day Not during SF1 week 4 or 5 (TBC) Addition of ventilation/pressurizatio n column Expected to be transparent ? To be defined Replacement of ED pumps (USA15), filling circuit & additional valve Demineralized water (Bus bar cooling) ? To be confirmed after TS3 10

11. Cryogenics (TE-CRG) M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 201511 InterventionsConsequencesCompensatory measuresDurationTentative schedule Solenoid dewar: repair faulty instrumentation. Requires installation of a scaffolding for access. None 1 week To be defined MR dryer: addition of new electrical column Stop of Main Refrigerator2 days 15-16/12/2015 or 25- 26/01/2016 MR dryer: commissioning No impactNone ? In the shadow of other activities SH1 24V power supplies redundancy. Sequence stop of MR, SR, ANRS.

12. Access & safety systems (GS-ASE) M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 201512 Maintenance of safety systems 1.Sniffers : LHCb done on TS2 ALICE planned on TS3 + completion on YETS ATLAS planned from Jan. 15 th to Feb. 25 th 6 rotations to perform the full maintenance of ATLAS sniffers Access to US15 required on 15/01, 22/01, 29/01, 05/02, 12/02, 19/02 2.ODH Annual maintenance : 3 days to be defined, should be transparent (tbc) 3.GAS & ODH Annual maintenance at surface : 2 days to be defined, should be transparent (tbc) 4.Fire detection Annual maintenance : 1 day to be defined, should be transparent (tbc) Sensor replacement : 5 days to be defined, alarms expected on DCS and DSS 5.Red phone maintenance : 1 day to be defined, transparent Maintenance of Access system Consequences of “Modification to access point key distributor” have to be understood and schedule agreed (mainly if not transparent…)

13. Vacuum (TE/VSC) M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 2015 No major intervention planned on vacuum chambers Neon venting is mandatory  Access to VJ for LUCID photomultiplier replacement  Opening on C side During Opening process (side C only) : o Release VT fixed point and supports  use of motorized supports o Release of VA fixed points o Participation to Small Wheel movement ; planned on Dec. 23 rd o Participation to Calorimeter movement (compulsory) ; planned on Jan. 4 th o Installation of mechanical protections (VA and VT) : week #1 During the Closing process : reverse operations (8-16 Feb.) Ready for Neon pumping on Feb. 19th 13

14. Survey (EN-MEF) M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 2015 Usual activities related to every YETS or Shutdown Measurement of the network Stability of ground Stability of TX1STF Maintenance of HLS system Detector position measurement when they are back to RUN position TAS position measurement and adjustment (if needed) Liquid Argon stability at the very end of YETS 14

15. Transport (EN-HE) M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 201515 Usual activities related to every YETS or Shutdown o Transport of equipment from B180 and B609 to Point 1: weeks 49-50 o Work in 2 shifts on week 51  2x3 crane drivers Pits opening Shielding lifting to surface Light Truck installation o Mobile crane to store concrete beams : 14-15/12/2015 o Reverse process from Feb. 4 th, 2016 o Various transport related to maintenance activities o After YETS, transport of specific equipment from Point 1 to B180 and B609

16. ALFA plans M. Raymond - 02 Octobre 2015ATLAS infrastructure activities during YETS 201516 On behalf of Sune Jakobsen New LVDT + electronics on A7L1L. (hopefully not new alignment) New crate for movement to reduce noise. Update of firmware for movement. New movement/interlock commissioning. New and plus additional FESA. New trigger commissioning. New vacuum pumps. Splitting DCS project in 2 (install new DCS PC). Replace fan filters. Migration to 64 bit SBC. Executables for PXI (automatic recovery after power cycle). Final firmware and software for ALFA_CTPIN (if not implemented before). Remove A7L1 for cleaning and aim for reinstallation end of YETS or a TS. New firmware for MB + PMF (Kris request). Worst case scenario (if UFO problems prosiest/enlarges):