Karsten Heeger, Univ. of Wisconsin UW, June 3, 2010 The DM-Ice Test Detector Detector Concept Mechanical Assembly Vessel Options Logistics Considerations

Karsten Heeger, Univ. of Wisconsin UW, June 3, 2010

The DM-Ice Test Detector

Detector Concept Mechanical Assembly

Vessel OptionsLogistics Considerations

Schedule


DM-Ice Test Detector

stainless or titanium cylinder main electronics boards for 2 PMTs

IceCube cable

copper plate (2”?)

penetrator

HV boardsbackfilled with nitrogen

5” PMT

5” PMT

light guides

light guides

NAIAD detector package

HV cable

HV cable

breakout cablemechanical suspensionbelow DOM 60

15-20m

Teflon mechanical supports for NAIAD crystals+light guide+PMT assembly

IceCube cable breakout

Conceptual Overview


NAIAD Detector

Detectors

existing detectors (PMTs, light guide, crystal) from previous experiment, will be retrieved from Boulby mine in UK in July

will need to replace optical coupling grease

will integrate detectors into new housing design for deployment with IceCube strings 79 or 80.



• design and integration effort in progress

• model of simple housing scaled up from radio work

• simple model of NAIAD detector

• will model several options until we have design decision

2 mainboards, 2 HV Boards and connections

Fig: Glen Gregerson



Components

2x 5” PMTs2x light guides1 NAIAD crystal

2x mainboards2x HV boards

copper shielding as required

1 or more penetrators + cable

1 suspension system

Weight

1 stainless or Ti pressure housing

???

???

negligible

~100 lbs

~20 lbs

~500-900 lbs for stainless options

~325-585 lbs for Ti options



• Suspension

– suspended from steel cables below DOM 60

– in addition or instead of weight stack at bottom of string

– weight may range from 500-1000 lbs based on design choice

• Electrical Connections

– special device connector at breakout 30 above DOM 59

– 8pin + ground

– signal to be transmitted into ICL via surface junction box

– connect to dor card in ICL


Test Detectors for Feasibility Study

• 2 identical detectors, strings 79 and 80


DM-Ice Test Detector Housing

Options Under Considerationwith mainboard waveform digitizer

Option A “mushroom”

Option B“straight cylinder”

Option C“cylinder+DOM”



Options Under Consideration


• Mechanical Suspension

– Attach to end of IceCube string below last DOM.

– 15-20m below end of string

– Suspend from end of IceCube cable with stainless cable or chains

• Electronics and Cabling

– One special breakout cable from end of Icecube cable to DM-Ice detector.

– Only one penetrator into DM-Ice pressure vessel.

– Use IceCube mainboard for waveform capture and HV board

– All HV is internal to pressure vessel.

• Housing

– Shield radioactive background of electronics from detectors with copper plate (~2”)

– Backfill with nitrogen for humidity and moisture control.

– reduce diameter of long cylinder to save weight and material

– No neutron detector, just NAIAD crystal




• same considerations as Option A except straight cylinder for ease of fabrication and simplicity

• slightly heavier because of material used in pressure housing





• Mechanical Suspension

– Attach to end of IceCube string below last DOM.

– 15-20m below end of string

– Suspend from end of IceCube cable with stainless cable or chains


– Use DOM sphere to house mainboards

– One special breakout cable from end of Icecube cable to DOM

– Multiple penetrators in and out of DOM sphere

– HV boards could be in DOM sphere (requires HV through penetrator) or in detector cylinder

• Housing

– Backfill with nitrogen for humidity and moisture control.

– reduce diameter of detector cylinder to save weight and material

– No neutron detector, just NAIAD crystal




Comparison




– compact mechanical design

– minimum number of feedthroughs and penetrators

– ease of handling, single object

– heavier (tot weight 550-950 lbs)

– more feedthroughs and penetrators

– multiple objects, handling possibly more complicated

– lightest option (370 lbs)



Options Under Considerationwith multichannel analyzer


– One special breakout cable from end of Icecube cable to DM-Ice detector.

– Only one penetrator into DM-Ice pressure vessel.

– Use commercial MCA with modem for data taking and communication


Logistics of DM-Ice Detector

• Shipment

– by air from Madison by Oct 22, 2010

– special shipping box, expected total weight ~ 800-1000 lbs per detector

– constrains on shipping box (pallet size)

• Storage

– on surface, do not worry about cosmic activation for feasibility study

– temperature variations from +30 to -40 deg C OK

• Pre-deployment tests at Pole

– unpacking from shipping box and visual inspection of outside

– suspend detector from lifting eyes or set up in stand

– HV electrical test and readout of detector’s PMT signal in test station

• Handling at Pole

– forklift with boom for positioning

– frame or crate with wheels for easy of movement

– winch inside tents for pre-deployment tests and for deployment?

• Anticipated deployment date

– Dec 15, 2010


Special Equipment for DM-Ice Detector Deployment

• Equipment Needs for Transport and Handling

– watertight shipping and storage box

– frame with wheels for handling and positioning

– boom for forklift?

– frame or winch in test tent for detector handling during pre-deployment tests

– frame or winch in TOS for detector handling during deployment activities

• Equipment Needs for Pre-Deployment Tests

– power supply

– DAQ

– computer setup at Pole

– can we use existing facilities for predeployment tests?

• ICL

• OML


Logistics of DM-Ice Detector

• Assumptions in planning transport and handling of detector for feasibility study

– ensure mechanical integrity of detector

– maximize integration and testing time in Madison to minimize risk of failure

– do not worry about cosmogenic activation during air shipment for this feasibility study

– allow pre-deployment functionality tests at Pole

– minimize storage time on ice (as much as reasonably possible)


Schedule Overview

Overview

design decisions by end of June

ready for integration in Sep

shipment by Oct 22, 2010

22 weeks until shipment


Schedule Details

Design Phase

to be completed by end of June

design decisions by end of June


Schedule Details

ProcurementFabricationPhase

July/August

ready for integration in Sep


Schedule Details

Integration Phase

September/October

shipment by Oct 22, 2010

Documents

Karsten Heeger, Univ. of Wisconsin UW, June 3, 2010 The DM-Ice Test Detector Detector Concept Mechanical Assembly Vessel Options Logistics Considerations