dune architecture considerations: facilities

DUNE Architecture Considerations: Facilities,Infrastructure, and PracticalitiesTheresa ShawDAQ WorkshopOctober 31, 2017

Content• Dune Locations

- Above ground

- Underground

• Infrastructure and Detector Grounding Plan

• Detector Racks

• Power Envelopes

• Fiber Plant

• Central Utility Cavern Control Room Study

• Slow Control

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Location

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Location

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Sanford Lab Homestake Visitor Center

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The Yates Shaft

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Small DAQ Control Room

Overall site layout

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Ross ShaftYates Shaft

Underground Excavation

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Infrastructure Grounding Plan

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Infrastructure Grounding – Docdb 285

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• Objectives

- To create an ‘isolated’ detector ground system consisting of the Cryostat (membrane and steel containment vessel), Detector Electronics racks (located on top of the cryostat) and the electronics resident in those racks or inside the vessel.

- This ‘isolation’ keeps building noise sources off of the detector’s sensitive electronics.

- A “safety” ground is implemented through a saturable inductor connecting the detector ground and “earth/building” ground. The inductor provides a DC path for fault currents and a resistive AC path for noise sources.

Infrastructure Grounding – Docdb 285

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Location of DAQ equipment• Ideally, we would like to keep as many sources of fast switching

currents off detector ground.- Consider locating most DAQ electronics in the Central Utility Cavern

(CUC), where it will be distant and on “building” ground.

- Only Optical fiber connections between the CUC and the detector are allowed.

- There may have to be space/power/cooling trade-offs made between the CUC and detector racks.

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Detector Racks

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Racks• Rough Draft of POSSIBLE detector rack layouts – based off

emails and ProtoDUNE found in https://docs.dunescience.org:440/cgi-bin/ShowDocument?docid=4499

• Detector Racks will be (3 rows of 25) or (3 rows of 35); at least one rack per vertical APA pair feedthrough.

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Detector Rack Cooling• Two options being looked at

- Air Cooling (fans)

- Water Cooling

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One Rack per APA pair

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Three Racks per 6 APAs

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Power Envelopes

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DUNE Power Requirement Envelope – Docdb 208

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Detector Power

Small above ground control room

Possible onsite large above ground control room

Underground CUC Control Room

Fiber Plant

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Fiber Optic Paths

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Fiber Requirements – Docdb 112

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Central Utility Cavern Control Room Study

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LBNF/DUNE Control Room Study Workshop on Dec 15-16, 2015 • Report from Workshop https://docs.dunescience.org:440/cgi-

bin/RetrieveFile?docid=937

Conclusions and RecommendationsFrom the workshop and information provided, the team has established designboundaries and room functions for the control facilities. The originalrequirements were developed into representative layouts to be further developedthe design team. The surface or underground control facility has different driversand it is considered that the underground control facility is the initial priority as itwill be needed to commission the experiment. Whereas the surface is envisionedas a more accessible and long term solution. The final desk configuration shouldnot be determined until the technology is chosen.

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Control Room Study Workshop• Starting Point

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Underground Control Room Study Workshop

• Results of Workshop identified 5 area types (Not all these spaces were later translated into Requirements!)- Control Space

- Conference/Meeting Space

- DAQ Space

- Flexible/Temporary Workspace

- Eating Facility

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Control Space

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Conference/Meeting Space

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DAQ Space

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Flexible/Temporary Workspace and Eating Facility

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What was Translated into Engineering Requirements

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• NOTE: Not all spaces identified from Workshop were translated into requirements

• https://docs.dunescience.org:440/cgi-bin/ShowDocument?docid=112

Slow Control

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DAQ Requirements – Docdb 112

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Slow Control and Monitoring Functions included in DAQ scope.  Lots of issues here as well:Equipment location, power, grounding, low noise …

Conclusion• Lots of work to be done defining details as the DAQ design

matures!

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