The DM-Ice Test Detector. Detector Concept Mechanical Assembly Vessel Options Logistics Considerations Schedule

Transcription

1 The DM-Ice Test Detector Detector Concept Mechanical Assembly Vessel Options Logistics Considerations Schedule

2 DM-Ice Test Detector Conceptual Overview breakout cable IceCube cable IceCube cable breakout mechanical suspension below DOM m penetrator stainless or titanium cylinder backfilled with nitrogen 5 PMT light guides NAIAD detector package light guides 5 PMT main electronics boards for 2 PMTs HV boards copper plate (2?) HV cable Teflon mechanical supports for NAIAD crystals+light guide+pmt assembly HV cable

3 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.

4 DM-Ice Test Detector 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

5 DM-Ice Test Detector Components Weight 1 suspension system 1 or more penetrators + cable 2x mainboards 2x HV boards copper shielding as required?????? negligible ~100 lbs 2x 5 PMTs 2x light guides 1 NAIAD crystal 1 stainless or Ti pressure housing ~20 lbs ~ lbs for stainless options ~ lbs for Ti options

6 DM-Ice Test Detector Suspension suspended from steel cables below DOM 60 in addition or instead of weight stack at bottom of string weight may range from 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

7 13 Test Detectors for Feasibility Study 2 identical detectors, strings 79 and 80 Karsten Figure 7: Heeger, Layout Univ. of of the Wisconsin full IceCube array showinguw, location June 3, of 2010 the strings and IceTop tanks color coded by the year of installation. Orange circles show the location of the planned string deployment for 2010/11 IceCube

8 DM-Ice Test Detector Housing Options Under Consideration with mainboard waveform digitizer Option A mushroom Option B straight cylinder Option C cylinder+dom

9 DM-Ice Test Detector Housing Options Under Consideration Option A mushroom Mechanical Suspension Attach to end of IceCube string below last DOM m 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

10 DM-Ice Test Detector Housing Options Under Consideration Option B straight cylinder same considerations as Option A except straight cylinder for ease of fabrication and simplicity slightly heavier because of material used in pressure housing

11 DM-Ice Test Detector Housing Options Under Consideration Option C cylinder+dom Mechanical Suspension Attach to end of IceCube string below last DOM m below end of string Suspend from end of IceCube cable with stainless cable or chains Electronics and Cabling 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

12 DM-Ice Test Detector Housing Comparison Option A mushroom Option C cylinder+dom Option B straight cylinder compact mechanical design minimum number of feedthroughs and penetrators ease of handling, single object heavier (tot weight lbs) more feedthroughs and penetrators multiple objects, handling possibly more complicated lightest option (370 lbs)

13 DM-Ice Test Detector Housing Options Under Consideration with multichannel analyzer 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 commercial MCA with modem for data taking and communication

14 Logistics of DM-Ice Detector Shipment by air from Madison by Oct 22, 2010 special shipping box, expected total weight ~ 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 detectorʼs 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

15 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

16 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)

17 Schedule Overview Overview 22 weeks until shipment design decisions by end of June ready for integration in Sep shipment by Oct 22, 2010

18 Schedule Details Design Phase to be completed by end of June design decisions by end of June

19 Schedule Details Procurement FabricationPhase July/August ready for integration in Sep

20 Schedule Details Integration Phase September/October shipment by Oct 22, 2010