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

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 Log(BER) (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 Hz Local coincidence rate: 15 Hz In Ice trigger rate: 6.5 Hz (8 in 2 µsecs) Combined trigger rate: ~ 7 Hz

DOM production in 2005 DOMsQuantity Installed at Pole (stored)76 (~180) UW - PSL610 DESY160 Stockholm/Uppsala160 Total to integrate:930 DOMs

DOM Production 2005 Coordination: J. Haugen

PY 4 Scope: Cables CableSurface cableSurface to DOM cable Installed at Pole41 Stored at Pole03 Stored in McMurdo11 Ship to Pole118 Ship to McMurdo (for 06/07 season) 18 To build16

XSJJ Connector Leakage Issue 9 of 30 quad pairs leaked water before freeze in. Raw connector design with these failure modes has passed testing: –Cold o-rings –Loosely tightened connectors Failures followed DOMs manufactured at PSL We have seen both of the following likely failure modes on PSL DOMs: –Scratched connector: Longitudinal scratches seen on DOM connector allow water to bypass o-ring. –Electrical tape remnants in connector: Remnants from tape used to hold cap on connector also provide path for water to bypass o-ring. Tim Murray is testing these failure modes at Sea Con this week and there are other failure modes (including breakouts) that still need to be ruled out.

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) (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.