Write-up and Definitions for Cost Model Two designs

Write Up : Two Designs Preliminary, V3.4 14/10/2008

Two designs Improved Antares String Design Cabled Design 3 OM/storey 1 PMT/OM Cabled Design 1 OM/storey 31 PMT/OM Both: fibers in vertical cable

Definitions Detection Unit (DU) (total 600m, 500m instrumented) Detection Unit Infrastructure Storeys (20, 25m distance) Detection Unit Infrastructure (DUI) Cable (flexible) Buoy Anchor (concrete slab ~ 1m3) String Master Module Storey Storey Infrastructure (StI) OMs

Detection Unit Infrastructure 4. Anchor 1. Buoy 3. StMM Cable breakout box with dry-mateable connector 3. Master Module with dry-mateable connectors 5. Interlink cable with dry- and/or wet-mateable connector Detection Unit Infrastructure Buoy Vertical cable(s) with electrical/optical/mechanical functions breakouts at each storey String Master Module (StMM) Anchor Optical/electrical interface to junction boxes 2. Flexible vertical cable

Detection Unit Infrastructure 4. Anchor 1. Buoy 3. StMM Cable breakout box with dry-mateable connector 3. Master Module with dry-mateable connectors 5. Interlink cable with dry- and/or wet-mateable connector Detection Unit Infrastructure Buoy Vertical cable(s) with electrical/optical/mechanical functions breakouts at each storey String Master Module (StMM) Anchor Optical/electrical interface to junction boxes 2. Flexible vertical cable

Cable in Improved Antares String Design Improved EOM cable of Antares Electrical/Optical/Mechanical function in one cable Built of sections between storeys and between anchor and storey 20 break-out boxes (one at each storey)

Cable in Cabled Design Electrical/optical functions Oil-filled hose at ‘equi-pressure’ 20 fibres (one for each storey) At least one pair of copper conductor 20 break-out boxes with a dry-mateable connector Mechanical function Two ropes along side hose Ropes connected at regular intervals (to provide torque)

String Master Module in Improved Antares String Design Contained in vessel at the base of the DU, possibly glass sphere Interlink cable between StMM and junction box Wet-mateable connector at the JB side

String Master Module in Cabled Design Vessel with DWDM multiplexer Just below lowest storey Interlink cable between StMM and junction box 1 or 2 fibre 2 copper conductor Wet-mateable connectorat JB side

Storey In both designs compact storeys Improved Antares String Design 3 OMs per storey interconnected Cabled Design 1 OM per storey

Storey Infrastructure 2. Mechanical interface to Detection Unit Interface 5. Optical/electrical interface between Storey electronics and vertical cable with dry-mateable connectors Storey Infrastructure mechanical infrastructure to suspend the optical module(s) (OMs) mechanical interface to the Detection Unit Infrastructure (DUI) Storey electronics Optical/electrical interface between Storey electronics and PMTs optical/electrical interface between Storey electronics and the vertical cable. 1. Mechanical suspension of OMs 4. optical/electrical interface between Storey electronics and OM(s) using dry-mateable connectors 3. Storey electronics

StI in Improved Antares String Design 2. Mechanical interface to Detection Unit Interface Storey Infrastructure (StI) mechanical infrastructure to suspend the optical module(s) (OMs) mechanical interface to the Detection Unit Infrastructure (DUI) Storey electronics Optical/electrical interface between Storey electronics and PMTs optical/electrical interface between Storey electronics and the vertical cable Water resistant Al alloy 1. Mechanical suspension of OMs Mechanical structure under study

StI in Improved Antares String Design Storey Infrastructure (StI) mechanical infrastructure to suspend the optical module(s) (OMs) mechanical interface to the Detection Unit Infrastructure (DUI) Storey electronics Optical/electrical interface between Storey electronics and PMTs optical/electrical interface between Storey electronics and the vertical cable. 3. Storey electronics 4. optical/electrical interface between Storey electronics and PMTs using dry-mateable connectors 5. Optical/electrical interface between Storey electronics and vertical cable with dry-mateable connectors

StI in Improved Antares String Design Storey Infrastructure (StI) mechanical infrastructure to suspend the optical module(s) (OMs) mechanical interface to the Detection Unit Infrastructure (DUI) Storey electronics Optical/electrical interface between Storey electronics and PMTs optical/electrical interface between Storey electronics and the vertical cable.

StI in Cabled Design Storey Infrastructure mechanical infrastructure to suspend the optical module(s) (OMs) mechanical interface to the Detection Unit Infrastructure (DUI) Storey electronics Optical/electrical interface between Storey electronics and PMTs optical/electrical interface between Storey electronics and the vertical cable. 1. Mechanical suspension of OMs 1. Mechanical suspension of OMs 2. Mechanical interface to Detection Unit Interface

StI in Cabled Design Storey Infrastructure 5. Optical/electrical interface between Storey electronics and vertical cable with dry-mateable connectors Storey Infrastructure mechanical infrastructure to suspend the optical module(s) (OMs) mechanical interface to the Detection Unit Infrastructure (DUI) Storey electronics Optical/electrical interface between Storey electronics and PMTs optical/electrical interface between Storey electronics and the vertical cable. 3. Storey electronics 4. optical/electrical interface between Storey electronics and PMTs

StI for Cabled Design Storey Infrastructure mechanical infrastructure to suspend the optical module(s) (OMs) mechanical interface to the Detection Unit Infrastructure (DUI) Storey electronics Optical/electrical interface between Storey electronics and PMTs optical/electrical interface between Storey electronics and the vertical cable.

Storey Infrastructure 4. optical/electrical interface between Storey electronics and PMTs 1. Mechanical suspension of OMs Storey Infrastructure mechanical infrastructure to suspend the optical module(s) (OMs) mechanical interface to the Detection Unit Infrastructure (DUI) Storey electronics Optical/electrical interface between Storey electronics and OM(s) and IM(s) optical/electrical interface between Storey electronics and the vertical cable. 2. Mechanical interface to Detection Unit Interface 5. Optical/electrical interface between Storey electronics

OM in Antares Improved String Design 5. Optical interface 3. PMT base 2. PMT 4. Communication Concentrator 6. Cooling 1. Glass sphere Optical Module Glass sphere vessel of 17” PMT(s) PMT bases Communication Concentrator Optical interface Cooling

OM in Cabled Design Optical Module 1. Glass sphere 6. Cooling 5. Optical interface 3. PMT base 2. PMT 4. Communication Concentrator 6. Cooling 1. Glass sphere Optical Module Glass sphere vessel of 17” PMT(s) PMT bases Communication Concentrator Optical interface Cooling

OM in Improved Antares String Design 17” glass sphere, possibly 13” 10” PMT, 45o looking down Choice PMT under study Q.E. PMT 32% Optical gel ~ 2-6 cm

OM in Cabled Design 17” glass sphere 31 x 3” PMTs (19 in lower half, 12 in upper) Front face following sphere radius Q.E. PMT 42% TTS PMT 1 ns (RMS) ~ 2 mm thick optical gel-pads per PMT

Readout and Trigger in Improved Antares String Design Readout similar to Antares readout Trigger L0: threshold value 0.3 spe L1-a: 2 x L0 within 20 ns at the same storey L1-b: threshold value 3 spe in one OM

Readout and Trigger in Cabled Design Fibre optics Both synchronous and asynchronous data transfer possible Trigger L0: threshold value 0.3 spe L1-a: 2 x L0 in adjacent PMTs in the same OM within 10 ns

Additional Instrumentation Both designs foresee additional instrumentation inside the OM Compass, tilt meter Acoustic sensor LED Under study

Proposal Agree on definitions (PCC?) Implement definitions in Excel file for cost model Agree on criteria for assessment: Physics/Euro, what do we mean?