PROJECT : IceCube Digital Optical Module Production at DESY Zeuthen

November 24, 2004 Rolf Nahnhauer 1

PROJECT :

IceCube Digital Optical Module Productionat DESY Zeuthen


IceCube StatusNovember 2004


- 80 Strings- 4800 PMT - Instrumented volume: 1 km3

- Installation: 2004-2010

The Experiment


AMANDA system IceCube

Goal: 18 holes/season 2450 m deep straight within 1m quality logged

Goal: 18 holes/season 2450 m deep straight within 1m quality logged

AMANDA IceCubePower consum. 2 MW 5MWTime to 2400 m 120-140 h 35-40 hFuel (gal/hole) 10000-12000 7000-8000 Set-up time 5 – 6 weeks 18-25 d

AMANDA IceCubePower consum. 2 MW 5MWTime to 2400 m 120-140 h 35-40 hFuel (gal/hole) 10000-12000 7000-8000 Set-up time 5 – 6 weeks 18-25 d

AMANDA and IceCube Drills


Hose-reel atSouth Pole (Jan 2004)

Hose-reel with hose,built at Physical Sciences Laboratory

UW-Madison (Nov 2003)


In-Door deployment

DOM Hub

Cable Winch

Slip Ring

Deployment Room

Tower Operations Structure(TOS)

OMs

DAQ

Entire string can be operated as soon as the OMs are connected.

Can operate string during drop

Mounting, testing + drop of string with 60 OMs

expected to take ~ 20 hours

Mounting, testing + drop of string with 60 OMs

expected to take ~ 20 hours

System to be set up at South Pole in November –December 2004

First hole to be drilled : January 2005

System to be set up at South Pole in November –December 2004

First hole to be drilled : January 2005

In-Door Deployment


•1st IceCube strings: Amanda as calibration device •IceCube ~ 20 strings + Amanda: powerful combined detector•Full IceCube: Amanda included as a fully integrated,

low threshold subdetector

•1st IceCube strings: Amanda as calibration device •IceCube ~ 20 strings + Amanda: powerful combined detector•Full IceCube: Amanda included as a fully integrated,

low threshold subdetector

CONTINUOUS SCIENCE OUTPUT DURING CONSTRUCTIONCONTINUOUS SCIENCE OUTPUT DURING CONSTRUCTION

Position of 1st IceCube strings as close to Amanda as possible for verification & cross-calibration … but logistics and

safety requirements

IceCube Deployment scheme

Amanda now runs with TWR data similar in structure to IceCube work on a s/w trigger


Project Year 3 4 5 6 7 8 TotalDeployment Year 04/05 05/06 06/07 07/08 08/09 09/10Drill/deploy strings 4 12 16 18 18 12 80Strings in ice 4 16 32 50 68 80 80DOMs needed 400 834 1064 1242 1182 778 5500Calendar year of prod. 2004 2005 2006 2007 2008 2009Cable systems to build 5 14 24 24 15 0 82Total DOMs: build and test 400 834 1064 0 5500DOMs: DESY 60 210 280 0 1330DOMs: Sweden 50 140 180 0 880DOMs: PSL 290 484 604 0 3290

3202

1912

780510

Production schedule

Numbers from February 2004 – slightly changing with timeBaseline change: 80 strings 70 strings + 10 strings from contingency


All Production sites successfully participated in the shipment of good DOMs to the Pole (integration and FAT)

Anticipate total of 280 DOMs shipped by end of Nov, 2004. Current total is 248.

Good team established which lays the groundwork for further DOM production success

PY3 DOM Production Summary

Production readiness review 17.11.2004Jim Haugen (Production manager) :


Integrated DOM


Process doc name Doc #

Tweaks during PY3 DOM production

cycleDOM Process Traveler 9000-0025 4PMT Collar Mount 9000-0026 4PMT High Voltage Board Attach and Clean 9000-0027 2PMT Potting 9000-0028 3PC Board Assembly 9000-0029 3PC Board Mount 9000-0030 2Penetrator Install 9000-0031 3N2 Backfill and Seal 9000-0032 3DOM Harness 9000-0035 2DOM Final Pack 9000-0036 3DOM Visual Inspection Criteria 9000-0040 4

Following docs are ready for signoff :

Integration procedures

Production sides got certified in May 2004 by US team from Project office


PY3 DOM Production Summary

0

50

100

150

200

250

300

350

400

Week ending

Qu

an

tity

Cumulative main boards shipped from LBNL

Cumulative DOMs ready for DFL - all sites

Cumulative DOMs shipped - all sites

Projection: 12 from Sweden 11/19, 20 from DESY 11/26

PY3 DOM shipment summary

A : IceTop DOMT : terminated DOMU : unterminated DOM

, but available


PY4 DOM Production Plan

0

100

200

300

400

500

600

700

Week ending

DO

M Q

uant

ity

Ready for DFL - PSL cumul

Ready for DFL - DESY cumul

Ready for DFL - Sw ed cumul

Ship 144(5/28)

Ship 200(8/6)

Ship 200(10/1)

Ship 60(6/25)

DESY ship 80(9/17)

Ship 72(7/2)

Sw ed ship 68(10/1)

PY4 DOM Production Plan


DOM Production and Testing at DESY


- Produce 1300 DOM’s in 5 years

- Test all DOM’s in Dark Freezer at -40 C

- Ship necessary number of DOM’s per year to South Pole






1st ProduktionEnd of February:

First 2 kits of electronic boardsarrived at Zeuthen

1.3.2004 :

First DOMproduced at DESY


6 kits of electronic boards (DOM rev4.2) arrived in Zeuthen beginning of May

Started test production of 6 complete modules immediately

tested technology and production chain trained technicians

All 6 DOM’s produced successfully in foreseen time

After 6 months DOM’s still in very good shape (gel)

Tests limited due to old revision of main boards (software compatibility)

2nd Produktion


3rd Produktion

Produce and test 60 DOM’s in July-August-September 2004

Needs special preparation : more jigs for gel pouring (+3) got +1 mid of August

60 DOM’s pre-potted 1.9.

DOM-mainboards are expected to arrive only at end of July 10 +15 arrived 23.8. 30.8.

35 DOM’s should go to South Pole (testing finished at 9/20) 25 DOM’s ready for testing at 16.9.

testing finished 5.10.shipping done 27.10.

Plan from March 2004 :


3rd Produktion

Got 9+7+6 mainboards: 23.10.,30.10.,7.11. all used for completion

of pre- potted modules

Got request to start second DFL test at the 4th of November

Have now still 6 complete DOM’s + 9 pre-potted DOM’s in store

Final 9 mainboards are promised to arrive in the next days


DFL TestingTesting system for 2004 will not be fully automatised

Light source 405 nm available and tested

Light source for lower wavelength under study(nitrogen laser? +splitter? + dyes?)

Ligth distribution system under development (DESY+Mainz)(2 test channels available)

DOM trigger (external trigger signal + optical monitor)planned to be build (DESY+Mainz)

DFL electrical cabling to be doneworked m

uch better than expected in March 2004


DFL Testing

Final Acceptance Test (FAT) :

US system completely copied in Sweden and Germany

Works mainly computer steered

Uses 3 light sources (laser, W-lamp+monochromator, LED)

Light distribution per glass fiber bundle

About 12 hours of data taking per cycle

Full test ~ 14 days, cycles at +20, -45, -20, +20, -45, +20 degrees


DESY FAT1

25 DOMs in DFL25 DOMs in DFL

1 DOM HUB1 DOM HUB

8 DOR Cards 8 DOR Cards

1 filter box1 filter box

4 breakout boxes4 breakout boxes

Light systemLight system

LaserLaser

W-Lamp + monochromatorW-Lamp + monochromator

LED LED

Fiber systemFiber system


Basic functionalityBasic functionalityCold/Warm Reboot (+)Cold/Warm Reboot (+)Local coincidence (-/+)Local coincidence (-/+)Monitoring (+)Monitoring (+)STF Test (+)STF Test (+)Test PMT Meas. (+)Test PMT Meas. (+)

DOMCAL (+)DOMCAL (+)

TestDAQTestDAQDark Noise (+)Dark Noise (+)PMT Gain vs. HV (+)PMT Gain vs. HV (+)Linearity Test(-/+)Linearity Test(-/+)Optical Sensitivity (-/+)Optical Sensitivity (-/+)Pedestal Pattern (+)Pedestal Pattern (+)Time Resolution (-/+)Time Resolution (-/+)

Stability TestStability TestMonitoring (+/-)Monitoring (+/-)Time Resolution & (+)Time Resolution & (+)Pedestal Pattern Test (-)Pedestal Pattern Test (-)

All this tests are done for: +20˚C, -45˚C, -20˚C, +25˚C, -45˚C, -25˚C, +20˚C All this tests are done for: +20˚C, -45˚C, -20˚C, +25˚C, -45˚C, -25˚C, +20˚C

For more details: For more details:

www.ifh.de/~tarasova/work/FAT1/DESY_status.html

Test scheduleTest schedule


--4545

+20

Simple Test Framework (STF):Simple Test Framework (STF):

Few problems at room Few problems at room temperaturetemperature

More failures at low temperatureMore failures at low temperature

Mainly flasher brightness, width, Mainly flasher brightness, width, pmt HV ramp, stabilitypmt HV ramp, stability

Reboot: No problem at room temperature

Only one communication failure at low temperature


RESULTS of DESY FAT1+FAT2Failed due to gel inspection 9,25,34


Production Quality at DESY

1+6 Test-DOM’s : all fine

25 DOM’s from FAT1: 1 reboot failure3 gel failures

21 DOM’s from FAT2: 1 flasher board failure13 gel failures !

Hard- and software design ok

Unsolved : gel problem, similar result in Sweden, different in US

Most probable reason: too early pre-potting before sealing specific for irregular production in 2004


Production schedule 2005


Production 2004

Regular production was impossible due to deliveryproblems of mainboards from the US

Nevertheless 280 DOM’s for the deployment of four strings are produced, successfully tested and shipped

All but one production steps under control

Only unsolved problem: gel behaviour needs further studies

DOM testing went much better than expected

Improvement of testing equipment under study


Production 2005 - 2008

- Start up problems hopefully overcome

- Producers well trained

- Production capacity sufficient

- Logistic proven

- Customs problems “solved”

but depend all the time strongly on delivery of components from outside

Documents

PROJECT : IceCube Digital Optical Module Production at DESY Zeuthen