Tables and figures for the PRR Calibration and tests

Preamble This document refers to the test and calibration activities that must be carried out for the correct functioning of the telescope.The document is divided into two main sessions named hereafter: Detector Calibration and Active Medium calibration.

The first (Detector Calibration) refers to all the instruments and procedures needed to calibrate the apparatus including: D1- Number of photons detected; D2- Timing (absolute and relative); D3- Positioning of the structure (absolute and relative).

The latter (Active Medium Calibration) to calibration of the active medium (i.e. seawater) including mainly: M1- Light propagation properties; M2- Sound propagation properties; M3 – Water column oceanographic properties

Each calibration issue is demanded to several subsystems, instruments and procedures to ensure cross-calibration and adequate redundancy and complementarity of data.

Accuracy of the measurement add it

Power consumption and other details of instrumentation

Summary tables of calibration systems and tests

Parameter System Subsystem On-shore calibrationmethod

Onshore calibrationparameters

Off-shore Calibrationmethod

Off-shore Calibrationparameters

D1- Number of photons

DOM PMT Black Box: PMT + resistive baseaim: production test- about 1% of all PMTs

Gain @Nominal HV,After/pre pulses, Dark Current(To be stored on DB)

Gain at Nominal Voltage 3E6H=dLogG/dLogHV -> 6.5<H<8

Optional measurementsQE, CE

PMT+digital base Black box: PMT+ baseaim:. PMT+base acceptance and calibration,CLB / octopus independent measurements

Gain Slope, Gain at Nominal HVDark Counts @NHVToT vs. charge @NHV,TTS @ NHVAfter/pre pulses @NHV(To be stored on DB)

PMT assembly acceptance characteristics (see tender):- Functionality- Dark Current @NHV and 0.3 spe: <2 kHz- Spurious @ NHVpre-pulses <1%delayed pulses <3.5 %afterpulses 1 (early) < 2%afterpulses 2 (late) < 10%

Full DOM Red Box (31 light sources): DOMaim: DOM acceptance and calibration

PMT MappingDC @ NHVAfter/pre pulses @NHVCharge spectrum @ NHV(To be stored on DB)

DOM acceptance characteristics:# PMTs within specs > 27

40K charge spectrum per PMT PMT nominal/actual HVPMT actual gain

D2- Timing DOM PMT Black Box: PMT + resistive baseaim: production test- about 1% of all PMTs

TTS, TT(To be stored on DB)

PMT assembly acceptance characteristics (see tender):- TTS < 5 ns- TT < 7 ns

40K coincidence spectrum on PMTs (inter DOM)

vertical tracks (intra DU)

nano-beacon coincidence (intra DOM, intra DU)

laser beacon coincidence(inter DU, intra DOM)

horizontal tracks (inter DU)

Full DOM(PMT-Base, Octopus, CLB)

Red Box (31 light sources and GPS): DOMaim: DOM acceptance and calibration

ToT@ NHVTime Offset (delta t) @NHV(DOM-PMT table to be stored on DB)

DOM acceptance characteristics:# PMTs within specs > 27

nano-beacon Factory Test: nano beaconaim: nano beacon acceptance and calibration

Light emission time distribution, time delay @ peak (latency)

Nano beacon acceptance defined in the tender

Red Box: DOMaim: nano beacon functionality test and

Time delay of nano beacon pulse in close PMTIn prototypes check latency vs. long time and switch on/off operation

T < X nsData Transmission

Optical Fibers + electronics latencies (DU+network)

White Rabbit.DU base: same fibre for TX and RX

To be defined wit the electronics and optical network group

DU Dark room (GPS + calibrated fibres on 1 PMT per DOM): Lineaim: Line acceptance test and time calibration with reference PMT

Time delay between reference PMTs in different DOMs.

Shore Station GPSElectronics CrateWhite Rabbit Switch

DU base: same fibre for TX and RX To be defined wit the electronics and optical network group

CB Laser Beacon Factory Test: laser beaconaim: nano beacon acceptance and calibration

D3 Positioning(timing issues demanded to D2)

DOM Piezo sensor + AES board

Factory Test: piezo+ AES interface boardaim: piezo + board acceptance and pre-calibration

Frequency and amplitude response (Factory sheet, to be stored on DB) Equivalent noise

Piezo acceptance defined in the tender(Factory sheet)

Piezo sensitivity: Beacon signal amplitude and frequency .

DU movements vs. currents

Piezo nominal/actual sensitivity and noise spectrum

Full DOM Red Box (Acoustic source): DOMaim: DOM acceptance

Frequency and amplitude response (functionality test) Equivalent noise(to be stored on DB)

AHRS (Compass, tilt, accelerometer)

Factory Test: AHRSaim: AHRS acceptance and pre-calibration

AHRS calibration parameters(Factory sheet)

Muon tracksLaser beacons, nano beacons

AHRS nominal/actual calibration parameters

Red Box (Rotating dish): DOMaim: DOM acceptance and calibration

AHRS calibration parameters with all DOM on (to be stored on DB)

Special DU Base (for the

Hydrophone Factory Test: Digital Hydroaim: digital hydro acceptance test and

Frequency and amplitude response (Factory sheet, to be

Beacon signal amplitude and frequency

Hydro nominal/actual sensitivity and noise spectrum

fist strings) calibration stored on DB) Equivalent noise (Factory sheet)

CB (auto-calibrating LBL)

Hydrophone Factory Test: Digital Hydroaim: digital hydro acceptance test and calibration

Frequency and amplitude response (Factory sheet, to be stored on DB) Equivalent noise (Factory sheet)

Beacon signal amplitude and frequency

Hydro nominal/actual sensitivity and noise spectrum

Beacon Factory Test: Beaconaim: acceptance test

Frequency and amplitude response (Factory sheet, to be stored on DB)

Autonomous LBL

Autonomous Beacons Factory Test: Beaconaim: acceptance test

Frequency and amplitude response (Factory sheet, to be stored on DB)

PMT: Photomultiplier tubeDOM : Digital optical ModuleLBL : Long Base-LineAHRS: Compass/tilt/accelerometer boardDU: Detection UnitCB: Calibration BaseCU: Calibration UnitGPS: Global Positioning System (here GPS receiver)

Red Box: Calibration box for the DOM equipped with:GPS (necessary for the DOM test)31 light sources (synchronised by GPS)acoustic source + signal generator (Synchronised by GPS) signal generator (synchronised by GPS)rotating dish

Black Box: Calibration Box for PMTs and bases equipped with:Custom DAQ system or customised CLB DAQDiffuse light source

Dark Room: Calibration Room for all DOMsSingle light source GPS driven and 18 Fibres (same length) distributed to 1 PMT/DOM

Parameter System Subsystem On-shore calibrationmethod

Onshore calibrationparameters

Off-shore Calibrationmethod

Off-shore Calibrationparameters

M1- Light propagation properties

DOM Nano beacon Factory Test: nano beaconaim: nano beacon acceptance and calibration

Light emission time spectrum, time delay @ peak

Red Box: DOMaim: nano beacon functionality test and

CB Laser Beacon Factory Test: Laser Beaconaim: laser beacon acceptance

Light emission time spectrum, time delay @ peak

M2-Sound Propagation properties

CU CTD Factory Test: CTDaim: CTD acceptance

Dependent on CTD modelCalibration constants for measured quantities (P,T,C) and derived ones (Depth, Sound Velocity, Salinity,…)

Inter-calibration with other instruments

SVP Factory Test: SVPaim: SVP acceptance

Dependent on SVP model Inter-calibration with other instruments

M3- Water column oceanographic properties

CU CTD Factory Test: CTDaim: SVP acceptance

Dependent on CTD model Inter-calibration with other instruments

ADCP Factory Test: ADCPaim: SVP acceptance

Dependent on CTD model Inter-calibration with other instruments

Description of the work

PMT batch qualification (1%) of the production – To be discussed and confirmed with the PMT Calibration group

Black box Material

plug and play PMT bases (ECAP like)Light source12 channels DAQ

Measurements:Gain Slope, Gain @Nominal HV,After/pre pulses, QE, CE , Dark Current (To be stored on DB)

Details:The base circuit is mechanically coupled with a plastic supportThe base has PIN receptacles is connects the leads to the circuitLeads inserted into the holes and into pins – if PMT leads are straight the time for the integration is 30 sec.Dark adaptation for PMTs 12 h.

PMT and active base acceptance test and calibration

This procedure is studied under the following assumptions

Logistics:

A) 15000 PMTs will arrive from Hamamatsu to INFN-LNS and Catania

B) 7500 PMT will be sent to ECAP and 7500 PMTs will be sent to INFN-Naples. Both ECAP and INFN-Naples will also receive 7500 bases (per site) from NIKHEF

C) INFN-Naples and ECAP will perform soldering of bases into PMTs and tests and Calibration of the PMT+base assembly

D) PMTs assemblies will be distributed to DOM assembly sites (Naples, Nikhef, ECAP, Catania-LNS, ….) for DOM integration, test and Calibration

Sites: INFN Napoli

Man Power: INFN Napoli , LNS and Catania

Time Plan: Soldering + coating

15 min per PMT 1875 h 8 h/day 234 working days. 20 day/month 11.7 month/man 4 operators 3 months

Testing and calibration7500 PMT + base 31 PMT per test in a dark box 242 test runs 4 tests/ day 61 days (2 dark boxes per site?)

Instrumentation: Black box Mechanical Frame € 4.000Laser source (available at INFN Naples and Catania) € 15.000Optical splitter 1x32 : 31 PMT + power meter € 10.000Improved Optical Power Meter (fibre monitor) € 5.000Optical attenuator set (on main fibre, available at Naples) € 1.50031 optical diffusers on FC/PC € 500UPS for the laser source € 1.500PMT+base digital readout 31 channels: 1 simplified shore station , 1 CLB , 2 octopus

Measurements and time details:Gain Slope, Gain at Nominal HV, Dark Counts @NHV, TTS @ NHV, ToT vs. charge @NHV, After/pre pulses @NHV, (To be stored on DB)

PMT unpacking and dark box filling 2 min x 31 PMTs = 1 hDark box closing and pre-setting 15 minFunctioning test of the chain 15 minDark adaption PMT 8 hHV on – Set Gain (PMT on at Nominal HV, Hamamatsu 3E6) 1 h

Measurement A: Dark Current Rate 1 min Measurement B: Laser and absorbers set to spe (Laser rate 20 kHz) 5 min

Measurement B1: ToT @ NHVMeasurement B2 TTS @ NHVMeasurement B3: Spurious Pulses (pre-pulses, delayed pulses, after pulses 1, after pulses 2)Measurement C: Gain Slope (ToT at 3 different HV: NHV, NHV+10%, NHV-10%) 10 min

(varying optical attenuators and not the laser intensity!) PMT re-packing and dark box unfilling 2 min x 31 PMTs = 1 hTotal 12 h (8 h dark adaption!)Data Base filling 2 h

DOM acceptance and calibration

Sites: INFN Napoli , INFN Catania, ECAP, Nikhef, others

Man Power: All sites

Time Plan: DOM Assembly with all pre-qualified probesSee PRR DOM time plan

Testing and calibration15000 PMTs / 31 (PMT/DOM) in 4 sites = 121 DOMs per site 6 months (20 days/month)

Instrumentation: Red Box Mechanical Frame € 4.000Laser source (available at INFN Naples and Catania) € 15.000Optical splitter 1x4 : 5 PMT + 1 power meter € 3.000Improved Optical Power Meter (fibre monitor) € 5.000UPS for the laser source € 1.5001 full shore station

GPS receiveracoustic emitter, signal generator (GPS-PPS trigger) € 2.000rotating dish + reference € 2.000

Measurements and time details:

DOM integration 12 hGel solidification 12 h

Red box closing and pre-setting 30 minFunctioning test of the DOM 30 minDark adaption PMT 8 hHV on – Set Gain (PMT on at Nominal HV, Hamamatsu 3E6) 1 h

Measurement A: Dark Current Rate (with glass and gel) 1 min Measurement B: Laser and absorbers set to spe (Laser rate 20 kHz) – Laser trigger GPS clock/PPS 10 min

Measurement B1: mapping : only 4 fibers on PMTs, use 40K to inter-calibrate PMTs (see http://pi1222.physik.uni-erlangen.de/Qualification/24)Measurement B2: delta T @ NHV (laser with 4 fibers firing 4 PMTs the rest )Measurement B3: ToT @ NHVMeasurement B4 TTS @ NHVMeasurement B5: Spurious Pulses (pre-pulses, delayed pulses, after pulses 1, after pulses 2)

Measurement C: Functionality test of acoustic reception (20,30,40 kHz, 2 amplitudes, acoustic emitter trigger GPS-PPS) 5 minMeasurement D: Compass Calibration using rotating dish 15 minMeasurement E: Functionality test of nano beacon 10 min

DOM Packing 20 min

Total 1 h + 24 h + 8 h dark adaption

Data Base filling 2 h

DU acceptance and calibration

Dark room: Materials

laser light source optical splitter 1 x 18full shore stationGPSAcoustic emitter for piezo test

Calibrated fibers at the DU base

Measurements:1 PMT per DU (intra DOM synchronisation): ToT@ NHV, Time Offset @NHVnano Beacon: time delay @ peak with close PMTsPiezoelectric sensor: functionality test

Details:Time for DU assembly – see DU integration documentDark adaptation for PMTs <12 hTime for measurements 1 h (including 5’ for the piezo and 5’ for the nano-beacon)

Calibration Units

3 CTD (top, middle, bottom) + oxygen (TBD)2 SVP (top, bottom)2 ADCP (top, bottom)

Base container :

- Sound Electronic Board

- CLBV2

+ others (AC/DC DC/DC ….)

DU or

JB

Acoustic

Emitter

Laser

Acousticreleases Interlink :

- detector clock (FO)

- data transfer (FO)

- energy

Inductive cable

ICC

Inductive instrument

Inductive interface coupled to

standard RS232 instrument

Acoustic

Receiver

Dead weight

Cub :Cui :

Extra container :

- IMM

- batteries

FIGURE 4 :

Ethernet electriccable

Base container :

- Sound Electronic Board

- CLBV2

+ others (AC/DC DC/DC ….)

DU or

JB

Acoustic

Emitter

Laser

Acousticreleases Interlink :

- detector clock (FO)

- data transfer (FO)

- energy

Inductive cable

ICC

Inductive instrument

Inductive interface coupled to

standard RS232 instrument

Acoustic

Receiver

Dead weight

Cub :Cui :

Extra container :

- IMM

- batteries

FIGURE 4 :

Ethernet electriccable

Calibration Bases

Laser Beacon, acoustic beacon, acoustic receiver (CLB)

Implementation plan Capo Passero

Calibration Bases (or DU + active bases) # 18, 22, 29IU: attached via ROV mate electrical connector to DU 29 (at about 80 m distance)

DU 9-12 should have acoustic receivers at their base

Autonomous Beacons: for the first lines should be placed in positions 18, 22 and later 29, 32

In addition: Towers will all have active bases (hydrophones + acoustic emitter)Towers 6 and 4 will have Laser Beacon at the baseTowers 1,2,3 will have CTD, SVPs and DCS

Implementation plan Meust

Calibration Bases (or DU + active bases) Define if numbering follows the installation sequenceIU: attached via ROV mate electrical connector to CB

First DUs should have acoustic receivers at their base

Autonomous Beacons: for the first lines should be placed in positions TBD