1. DOM integration meeting
October
Daan van Eijk

2. actions from previous meeting
(Minutes were never sent but are here:
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?

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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!)

9. 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

10. 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

11. 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

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

13. 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

14. Additional documentation
KM3NeT_DOM_2016_005- Penetrator_pressure_testing_procedure_Bruijn_v1
Important for Athens group

15. Backup

16. 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…

17. Removing grounding cable: proposal (2)