Detector Status J. Brunner 12/09/2014

Highlights Line 3 Optical Margins Line 5 UPS Situation Data Taking Status Planned Operations

Line 3 25/06/14 : Several short power cuts at IMP – Power cut of the Detector at 05:09:07.6 – Breaker of JB1 (Line 3) found open – Trials to rearm failed (S. Henry, M. Ageron) – No power consumption of line

Line 3 – Tests Optical loop measurements – No optical Loop for Line 3 –  all other lines OK Ping of acoustic releases (16/07/14) – Acoustic Releases Line 3 (both) do not respond –  other lines ok (with exception of 1 release) Suspicion : Line 3 is gone … Comex : Janus 2 + Apache ROV – 23-25/07/14, 12h dive on 24/07/14 – Check Line 3 still in place – Try to understand reason for failure – General detector survey

Line 3 – ROV operation Line 3 in place, nothing suspicious Release system ok Connector ok

Line 3 – ROV operation Junction Box inspection IL Cables not under tension Connectors seem ok

Line 3 – ROV operation Junction Box inspection IL Cables not under tension Connectors seem ok

JB Connector Layout

Line 3 Friday 25/07/14 : new trials to rearm breaker Documentation not clear Software gives ambiguous replies Correct RS232 command “ 0SB” – G. Hallewell, S. Henry, JB Rearming without problems ! Spontaneous breaker opening  not understood Acoustic Releases  Coincidence ? Optical Loop  see next slides

Optical margins D. Tezier & M. Ageron : 09/07/14 Comparison to 22/03/2011 : stable within 2dB -1db -6db

Optical margins Line 3 Ligne 3IPTXRX SCM ,818,67 S I ,9317,76 S II ,3216,84 S III ,7116,23 S IV ,3216,54 S V ,32 Reference 2011 : All values well above 30db  important loss since ! Likely reason for absence of optical loop

Line 3 Interlink cable Knot with some object (plastic bag) Try to open the know with Comex submarine  only partially successful Cable bending might explain strong attenuation Attenuation might explain absence of optical loop

Line 5 22/08/14 at 23:49:48 during Run Lines stopped working, no power cut

Line 5 Later that day : 2 lines recovered – JB power cycle Line 5 not recovered – breaker JB16 – Impossible to rearm – 15SB, FSB

Breaker Tests Successfully rearmed Never touched Successfully switched Rearming Unsuccessful

Line 5 – Optical Loop June 17db  August 19db Stable situation Optical continuity No doubt that Line 5 is there  Consider Line definitely lost 23 OMs had been dead already Loss of 52 OMs ( 52/700 = 7.5% )

Asymmetries Hard to interpret  Line 3, nothing special Line 3

Asymmetries Hard to interpret  Line 5  strange jumps Line 5

Asymmetries Hard to interpret  Line 4  change of 100V Line 5

UAC In Line 5Line 3

UPS Situation IMP June 2014 – New batteries ordered for both main UPS at IMP Successfully installed 11/09/14 ! Warranty for upgraded systems 3 years Additional two small UPS (1.6 kW) installed for dedicated equipment – Clock computer  not needed anymore – Card D of JB to avoid shutdown of JB in case of IMP power cut Stable situation reached (hopefully) Open : UPS for detector (~10,000 Euro)

Operations (plots from Damien) Neutrinos per day Averaged over 1 month 2 ½ years Total neutrinos within 2 ½ years

Operations (plots from Damien) Active data taking per month over 2 ½ years Muon rate evolution Over 2 ½ years 2016

Operations (plots from Damien) Muon rate evolution last 3 months Muon rate evolution In 2014

Detector Survey Line 1 survey during ROV operation July 2014 Likely reason for observed efficiency drop Cleaning possible ?  being investigated

Detector Survey Line 1 survey during ROV operation July 2014 Likely reason for observed efficiency drop Cleaning possible ?  being investigated

Next Operations October 8-11 : IFREMER operation “Estime” – Connect Oxygen Probe on BJS with Victor Request to IFREMER for following actions – Disconnect IC at BSS of Line 5 –  try rearming breaker Rearming ok Recover Line 5 At later stage Rearming fails Disconnect IC at JB Try rearming, if ok  exchange IC

Summary Future Sea Operation BJS (IFREMER) : 8-11 October 2014 – Needs ANTARES shutdown during Victor operation November 2014 : MEUST Cable – Needs ANTARES shutdown when arriving onshore

Operation Manager & Antares Shifts Juan Pablo : no official news – seems slowly recovering Present shift schedule stops at 18/12/2014 Have sent out call for Run coordinators – 2 positive replies so far : B. Baret & V. Kulikowski Desperate situation …..