DOM integration meeting October 18 2016 Daan van Eijk

actions from previous meeting (Minutes were never sent but are here: https://indico.cern.ch/event/568414/) Daniele: Status of retuned HV on 6 PMTs in DOM67 Write NCRs on ARCA-DU3: Orientation of conical spring washers in DOMs wrong way around (include old drawing on which this mistake was based) Wrong cooling pads in DOMs or cooling paste used in DOMs instead of cooling pads Emanuele: Pour gel in one DOM first, assess the quality of the gel and report back before going ahead with DOM integration Weekly report suggests this has happened on DOM201. Is this correct? White gas: Did everyone buy it?

Grounding cable DOM159 before DOM107 after DOM159 after DOM107 before Tentative decision (not official yet): Stop mounting grounding cables in future Remove grounding cables in existing DOMs Please wait for further instructions No change with respect to earlier message: do not close DOMs

Other Issues Store all 3D-printed items, i.e. fiber trays, spring holders and PMT support structures in a dark place, to prevent damage from long-term UV exposure. This is written down in DOM design and components document, under QA/QC for all 3D-printed components CLB+PB availability: It might be that some of us can not reach DOM integration tools due to CLB+PB inavailablity Before installing the gap pad on the power board, mount kapton on soldering, see NCR KM3NeT_QA_2016_138 and pictures to the right Idea from Maarten: DOM with color filters in front of PMTs to extract information on absorption lengths in water

Rest of meeting: review Planning: Have all documentation ready by end of October All information in hands of external review committee half November Will now present for all existing documents: Status Proposed changes

DOM integration plan Document name: KM3NeT_INT_2015_009-DOM_Integration_Plan Current version: 3 Proposed changes for next version: add and complete responsibilities of DOM integration coordinator DCR: KM3NeT_QA_2016_196-DCR_DOM_integration_plan_v1

DOM exploded view Document name: KM3NeT_INT_2015_001-DRA_DOM_Exploded_View Current version: 13 Proposed changes for next version: changed number of M3x12 to 2 and M3x16 to 5 (also affects procedure!), many aesthetic changes, changed hexagon nut DIN number (439B instead of 934, i.e. ‘low’ instead of ‘high’) DCR: KM3NeT_QA_2016_156-DCR_DOM_exploded_view_v1 Expected change: Remove grounding cable

DOM design and components Document name: KM3NeT_INT_2016_006- DOM_Design_And_Components Current version: 1 Proposed changes for next version: none, new document (please read!)

DOM integration tools Document name: KM3NeT_INT_2015_010-DOM_Integration_Tools Current version: 0 Proposed changes for next version: added all available technical drawings DCR: KM3NeT_QA_2016_197-DCR_DOM_integration_tools_v1 In particular, added drawings and pictures for: penetrator and valve plug (thanks Oleg!) DOM transportation box HV cap cutting tool Power board gap pad mold

DOM testing Document name: KM3NeT_DOM_2016_004-DOM_Testing Current version: 1 Proposed changes for next version: changed JPP software version tag, changed MRunAnalyzer tag , made Naples setup similar to Catania DCR: KM3NeT_QA_2016_157-DCR_DOM_testing_document_v2 Expected change: Comments by Oleg

DOM integration procedure Document name: KM3NeT_INT_2015_008- PRO_DOM_Integration_Procedure Current version: 4 Proposed changes for next version: see next slides DCR: to be written

Changes in dom integration procedure See Excel sheet attached to Indico of this meeting

DOM integration documents Should reflect all discussed DCRs: KM3NeT_QA_2016_156-DCR_DOM_exploded_view_v1 KM3NeT_QA_2016_157-DCR_DOM_testing_document_v2 KM3NeT_QA_2016_196-DCR_DOM_integration_plan_v1 KM3NeT_QA_2016_197-DCR_DOM_integration_tools_v1

Additional documentation KM3NeT_DOM_2016_005- Penetrator_pressure_testing_procedure_Bruijn_v1 Important for Athens group

Backup

Removing grounding cables: proposal Open, before glueing PMT structure Open, after glueing PMT structure Closed Remove grounding cable ring on CLB side by unmounting screw on CLB (careful for fiber in tray) Remount screw Grab the loose end of the cable with long pliers and pull it up in order to bend away the penetrator side cable from the mushroom as much as possble Cut away (using long cutters) the grounding cable as close to the penetrator as possible (careful for fiber!) Idem, but now you really need long pliers and cutters, and you need to be careful for the glass of the PMTs We need to think if and how we’re going to open all closed DOMs…

Removing grounding cable: proposal (2) http://www.onlineaquariumspullen.nl/nl/rvs-plantenschaar.html?id=58206314&quantity=1