April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 1 IceCube Digital Optical Module Production R. Nahnhauer DESY

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 1

IceCube Digital Optical Module

ProductionR. Nahnhauer

DESY



DOM PRODUCTION

Production of up to 5500 Optical Modulesuntil end 2008 :

Gel mixing, filling and potting PMTs

Collar mounting and assembly of electronics

Sealing of DOMs at low pressure

DOM testing in DFL

Harness DOM with suspension

Finally pack DOMs and ship them to the pole


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

xxx


DOM Production Site Integration Status - PY5 (April, 2006 - March, 2007)

1125

1005

370399

320285

0

200

400

600

800

1000

1200

Plan integration Actual Integration Plan Integration Actual Integration Plan Integration Actual Integration

Week ending 3/31/07 (PY5 complete)

PSLDESY

Sweden

Site % to Weekly Plan % PY5 completed

PSL 89 89

DESY 108 108

Sw eden 89 89

Site Total Plan

PSL 1125

DESY 370

Sw eden 320

Final snapshot for PY5

Great job…all sites


DOM Production Site Integration Status - PY6 (April, 2007 - March, 2008)

1097

0

430

0

336

00

200

400

600

800

1000

1200

Plan integration Actual Integration Plan Integration Actual Integration Plan Integration Actual Integration

Week ending 1/24/07

PSLDESY

Sweden


PSL 0 0

DESY 0 0

Sweden 0 0

Site Total Plan

PSL 1097

DESY 430

Sweden 336

Do not use this chart till April, 2007 - see PY5 charts for current PY5 informationShould be no problem to do


LBNL DOM Main Board Rev5.1C Delivery Chart

0

500

1000

1500

2000

2500

3000

11/2

4/2006

12/8

/2006

12/2

2/2006

1/5/2007

1/19/2007

2/2/2007

2/16/2007

3/2/2007

3/16/2007

3/30/2007

4/13/2007

4/27/2007

5/11/2007

5/25/2007

6/8/2007

6/22/2007

7/6/2007

7/20/2007

8/3/2007

8/17/2007

8/31/2007

9/14/2007

9/28/2007

10/1

2/2007

Week ending

Qu

an

tit

y

Cumulative boards shipped - plan all sites

Cumulative boards shipped - actual

A plug for John Joseph and LBL, good job here

DOM Main Board Production


PY Year DOMs ready at

PSL

DOMs ready in Sweden

DOMs readyat DESY

03 4/04-3/05 280 59 60

04 4/05-3/06 601 159 160

05 4/06-3/07 1005 256 400

06 4/07-3/08 1097 317 430

07 4/08-3/09 ~200 ~185 ~200

DOM integration will finish 7/08 to 11/08

decision how many DOMs for how many stringshave to be produced, will come in May 2007

DOM Production in Total


Components for Final Production IceCube DOM Production CY2004 - CY2008 for 80 strings installed

0

10

20

30

40

50

60

70

80

90

24.0

7.20

04

24.0

9.20

04

24.1

1.20

04

24.0

1.20

05

24.0

3.20

05

24.0

5.20

05

24.0

7.20

05

24.0

9.20

05

24.1

1.20

05

24.0

1.20

06

24.0

3.20

06

24.0

5.20

06

24.0

7.20

06

24.0

9.20

06

24.1

1.20

06

24.0

1.20

07

24.0

3.20

07

24.0

5.20

07

24.0

7.20

07

24.0

9.20

07

24.1

1.20

07

24.0

1.20

08

24.0

3.20

08

24.0

5.20

08

24.0

7.20

08

Week ending

Qu

anti

ty o

f st

rin

gs

read

y fo

r in

stal

l

Block 1

Block 2

Block 3

Final Integrated DOM PRR (early June 2006)

PMTs, spheres ordered - qty 1200

Place orders for main board, HV suite, flasher board, delay board, penetrator assembly, harness, etc - qty 1200, Block 3A

Block 3 Design freeze

qty = 1200, 3AStrings installed in ice at Pole

Known major changes between Blocks 2 and 3:1. CAEN supplied HV control board2. Toroid on HV base3. Pigtail and Harwin connector on penetrator assembly

DOM Subsystem Final Design Verification and CDR - best case: good to order 3600 units, must order 1200 min. Aug 29 - 30

qty = 2400, 3B

qty = 700, 3C to 80 strings

Block 3A readiness review, March 2006

Must order last 700 units to continue to 80 strings Feb, 2008

Must order Block 3B 2400 units to continue uninterrupted in Nov, 2006

Note: this plan reduces quantity of DOMs to ship to the Pole in CY2006 from 16+ to 14+ to accommodate later production start


DOM TESTING

3 MDFL at PSL

1 DFL at DESY

1 DFL in Uppsala


DOM Testing RequirementsElectronic and optical requirements

Reboot- and communication over a wide temperature rangefrom +20°C to -45°C (or -55°C for ice-top DOMs)

Single photo electron detection

Wide dynamic signal range – capable to handle large light pulses with up to several 1000 photo electrons per microsecond

ime resolution better than 5ns for single photo electron pulses

High voltage calibration of the PMT better than 5%

Optical sensitivity within low variations for different DOMs

Dark noise rates less than 1kHz in ice

Mechanical requirementsVibration and pressure fluctuation during transport

Rapid temperature variations from +20°C to -45°C

Very high environment pressure up to 650 bar


DOMPASSPORT

Main Page


DOM Passport - Example Pages

Dark Noise Optical Sensitivity

Time Resolution


DOM Production Site DFL test Status - (Jan, 2007 - Sep, 2007)

0

50

100

150

200

250

300

350

Plan cumulative DFL loaded Actual loaded Plan cumulative DFL loaded Actual loaded Plan cumulative DFL loaded Actual loaded

Week ending 3/31/07

PSLDESY

Sweden


PSL 82 28

DESY 139 52

Sw eden 138 69

Site Total Plan

PSL 858

DESY 280

Sw eden 240

This is the DFL load plan to support shipping 1300 DOMs to Pole in CY2007

2007 is also starting out good

FAT Status Snapshot in 2006


2007 DOM Testing example (DESY)time load good bad FAT

FAT16 29.01-14.02 57 50 7 0.88

FAT17 28.02-17.03 57 49 8 0.86

FAT18 22.03-11.04 34 31 3 0.91

FAT 16

Passed

STF

FB

Dark Rates

Comm/other

Gel

FAT 17

Passed

STF

FB

Dark Rates

Comm/other

Gel

FAT16 FAT17

No dominant error source could be identified in FATsDifferent small problems appeared for all FATs at all sites

Only ~1% of DOMs are cannibalized – goal was 5% or betterGood components are used in next years production


DOM SHIPPING


CY2006 DOM Ship to the Pole - Plan vs. Actual

0

200

400

600

800

1000

1200

Week ending

DO

M Q

ua

nti

ty

PSL Plan

DESY Plan

Sweden Plan

Cumulative Plan Shipped

Cumulative Actual Shipped

Awesome!

After 06/07 season: 200 DOMs at Pole 256 DOMs at McM

957 vs plan of 900

DOM Shipping 2006


DOM Shipping 2007

CY2007 DOM Ship to the Pole - Plan vs. Actual

0

200

400

600

800

1000

1200

1400

Week ending

DO

M Q

ua

nti

ty

PSL Plan

DESY Plan

Sweden Plan

Cumulative Plan Shipped

Cumulative Actual Shipped


DOM Quality in the IceDarkNoise (w/ deadtime) rates by DOM nationality

0

100

200

300

400

500

600

700

1400 1600 1800 2000 2200 2400Depth (m)

Rate (Hz)

Swedish DOMs

USA DOMs

German DOMs

LC Rates by DOM nationality

0

2

4

6

8

10

12

14

16

18

1400 1600 1800 2000 2200 2400Depth (m)

LC Rate (Hz)

Swedish DOMs

USA DOMs

German DOMs

DOMs from all production sites show same behaviour in the ice ☺


SummaryDOM mass production is running without problems

Production teams well trained

Delivery of components mostly smooth

Many small problems contribute to test failure rate

Total failure rate after rework sufficiently small (better than expected)

All sites well prepared for continuous mass production until autumn 2008

Documents

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 1 IceCube Digital Optical Module Production R. Nahnhauer DESY