Instrumentation -Results from first season and

plan for 2005

A. Karle

Iceube Collabration meeting

Berkeley

March 19, 2005

Major progress since Uppsala

Shipped to South Pole (hardware):– 280 DOMs– 4 pairs of cables– 8 tanks

Progress at Pole:• 76 DOMs deployed• 76 DOMs are communicating • 76 DOMs have time calibration • 76 DOMs are triggering muon and shower

events at 7.5 Hz

3

Potted DOMs /w/ HV base attached awaiting boardstack attach.

DOMs sealed and ready for FAT in storage containers in PSL highbay.

Production Pictures

Testing DOMs on the ice

DOM transport

Mark Krasberg &Jim Braun

DOMs in deployment tower (TOS)

Cable for string 1 Weight: ~6t

QuickTime™ and aPhoto - JPEG decompressor

are needed to see this picture.

Last optical sensor

Connecting the cable

IceTop:ice tank

DOM in tank ice

First contact

Light Flasher tests

• Calibration of timing and geometry.

• New: Study optical response function of string by comparing data before and after the freeze-in.

Noise rates after freeze-in: ~0.75 kHz

DOM clock stability (IceTop)

Timing

• Clock calibration: of order 2 nsecs rms (cross-over timing)

• DOM <---> DOM Hub (surface DAQ) communication:

• simultaneous comms on all channels

• Bandwidth: ~ 1 Mbit/pair on all DOMs of string. (consistent with design goal)

• Realistic cross-talk situation of pressurized cable. (Never achievable in lab.)

• Elevated error rate on one quad (2 pairs, 4 DOMs) in configboot mode (startup mode). Possible hardware defect. Currently no consequences for readout seen. However, it is critical to pass the configboot phase.

Communication to DOMs

0 10 20 30 40 50 60

-4

-6

-8

-10

Log(

BE

R)

(analysis by JJ)

Significance of this result for instrument design validation:

– Cable design and production– Communications protocol– DOM and DAQ design– String deployment

• Risk for project has dropped substantially.

Communication to DOMs

Event in run 463

Trigger Rates

Run # Depth (m)

See Song/Hill talk for analysis

Singles rate: ~750 HzLocal coincidence rate: 15 HzIn Ice trigger rate: 6.5 Hz (8 in 2 µsecs)Combined trigger rate: ~ 7 Hz

DOM production in 2005

DOMs Quantity

Installed at Pole (stored) 76 (~180)

UW - PSL 610

DESY 160

Stockholm/Uppsala 160

Total to integrate: 930 DOMs

DOM Production 2005IceCube DOM Production PY4 - Summary

0

100

200

300

400

500

600

700

800

900

1000

3/6/093/20/094/3/094/17/095/1/095/15/095/29/096/12/096/26/097/10/097/24/098/7/098/21/099/4/099/18/0910/2/0910/16/09

Week ending

Quantity

DOMs ready for DFL @ PSL - cumulativeplan

DOMs ready for DFL @ DESY - cumulativeplan

DOMs ready for DFL @ Swed - cumulativeplan

DOMs ready for DFL - cumulative plan allsites

Ship 272 on 7/16

Ship 208 on 9/10

Ship 80 on 10/8 (vessel)

DESY - Ship 100 on 7/30

DESY - Ship 16 on 10/1

Ship 96 on 7/23 Ship 48 on 10/8

Summary:1. PSL integrates 610 DOMs from 4/2 to 9/3, ships 540 DOMs (includes 24 from CY2004).2. DESY integrates 160 DOMs from 4/23 to 8/6, ships 116 ( includes 12 from CY2004, hold back 40 CAEN HV units). 3. Sweden integrates 160 DOMs from 4/30 to 8/27, ships 144 ( includes 24 from CY2004, hold back 24 CAEN HV units).

Coordination: J. Haugen

PY 4 Scope: Cables

Cable Surface cable Surface to DOM cable

Installed at Pole 4 1

Stored at Pole 0 3

Stored in McMurdo 1 1

Ship to Pole 11 8

Ship to McMurdo (for 06/07 season)

1 8

To build 16 16

String 21 Connector Leakage Test

0.1

1

10

100

1000

Q2 Q2 Q3 Q3 Q4 Q4 Q5 Q5 Q6 Q6 Q7 Q7 Q8 Q8 Q9 Q9 Q10 Q10 Q11 Q11 Q12 Q12 Q13 Q13 Q14 Q14 Q15 Q15 Q16 Q16

Quad #

Current (uA)

1/29/05 0600

1/30/05 2300

1/31/05 1530

1/31/05 1700

2/1/05 1200

2/1/05 1700

2/1/05 1930

2/2/05 1030

• 9 of 30 quad pairs leaked water before freeze in.

•Investigation suggests: •Fundamental design of connector is sound.•Probably issue in handling during production and shipping.

•The good news: •Avoided operation before freeze-in•No detrimental effect to DOM or lifetime of DOM seen.

DOM connectors

(µA)

100

10

1

01

2 (Quad number) 16

Cables

• Contract between UW and Ericsson for the production of all cables in place.

• Purchasing process for breakouts and terminations in progress (RfP to go out next week)

PY04 Scope: DAQ HW

• DAQ hardware: – DOM mainboards for 930 DOMs, design stabilized,

(functionality identical, only minimal tweaks compared to last season)

– DOM - DOR communications firmware (DOR Rev 1), DOM firmware

– DOM Hubs sufficient for 12 strings and additional lab use– DOR Rev 1 design verification and production of 300 cards– Clock distribution system

PY04 Scope: DAQ SW• DAQ software:

– Reading out all DOMs at the Pole, – Current DAQ SW configuration:

• Using TestDAQ for reading data from DOMs (based on production testing)

• DAQ architecture based configuration “Monolith” used for triggering and eventbuilding.

– Full deployment DAQ system configuration on SPTS by August 1.

– Deployment ready for Pole by September.

PY04 Scope: IceTop

• IceTop: – Build 12 stations (24 tanks) for Pole – Build 74 tanks, 1/2 of the remaining tanks for all of IceCube– Continue DAQ specific engineering (SW, fpga, triggering)

– No major issues seen.

Conclusions

• Enormous progress was made in all areas of instrumentation.

• First IceCube string successfully deployed. 8 tanks deployed.

• Initial operation of 76 DOMs provides basis for going ahead: – Extremely valuable data– Issues are being worked, but– No show stoppers seen – Detailed analysis on data and issues ongoing

• On track for next year deployment.