instrumentation - results from first season and plan for 2005 a. karle iceube collabration meeting...
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Instrumentation -Results from first season and
plan for 2005
A. Karle
Iceube Collabration meeting
Berkeley
March 19, 2005
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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
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3
Potted DOMs /w/ HV base attached awaiting boardstack attach.
DOMs sealed and ready for FAT in storage containers in PSL highbay.
Production Pictures
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Testing DOMs on the ice
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DOM transport
Mark Krasberg &Jim Braun
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DOMs in deployment tower (TOS)
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Cable for string 1 Weight: ~6t
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QuickTime™ and aPhoto - JPEG decompressor
are needed to see this picture.
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Last optical sensor
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Connecting the cable
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IceTop:ice tank
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DOM in tank ice
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First contact
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Light Flasher tests
• Calibration of timing and geometry.
• New: Study optical response function of string by comparing data before and after the freeze-in.
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Noise rates after freeze-in: ~0.75 kHz
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DOM clock stability (IceTop)
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Timing
• Clock calibration: of order 2 nsecs rms (cross-over timing)
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• 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)
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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
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Event in run 463
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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
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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
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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
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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
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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
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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)
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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
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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.
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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.
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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.
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