Jim Baccus

High Energy - Engineering Working Group

IceCube PY8 Spring Collaboration Meeting

Apr 29, 2009

HE86

HE110

Closeup of HE110

5

IceCubeSpring

Collaboration Meeting

High Energy Working Group

April 29, 2009

Overview and Topics

• Group of the following people has been meeting once / wk to prepare engineering baseline information for a High Energy design proposal:– Bob Paulos, Jim Haugen, Perry Sandstrom, Andy

Laundrie, Tom Hutchings, Tom Ham, Tim Murray, Paul Wisniewski, and Mark Krasberg

• Two phases of High Energy– HE86: Nine strings in SW corner IceCube, installed

in 20010 / 2011 season.

– HE110: Additional 24 (?) strings north of IceCube installed in 2011 / 2012 & 2012 / 2013 seasons.

6

IceCubeSpring

Collaboration Meeting

High Energy Working Group

April 29, 2009

HE86

• Assuming HE86 is approved, the following tasks need to be completed in order to make this happen:– Successful testing of DOM / DOR communications

extended length (to 3850 m)– Surface Cable extension cable order, mfg, and

delivery to the pole– Minor changes to drill (discussed in later slides)– Verification of longer drill reach capabilities

• Surface Cable Extensions:– These orders would look exactly like Surface Cable

orders to Ericsson. Approximately 7 cables Lengths 200 m – 600 m

7

IceCubeSpring

Collaboration Meeting

High Energy Working Group

April 29, 2009

HE 110 – Counting House• Topics discussed

– Counting Houses: One counting house between two

rings is best design option

Power / comms likely from Building #61 (next to MAPO)

One possible layout shown here…

12 ft x 24 ft Serves both HE rings 24 hubs for InIce (3 racks) 3 hubs, 7 pwr supplies, IceTop

RS485 module (1 rack) 4 patch panel racks Transformer & air handling

equipment

8

IceCubeSpring

Collaboration Meeting

High Energy Working Group

April 29, 2009

HE 110 – Strings, DOMs, Locations

– String configuration: # of strings = 24 – 32 # of DOMs / string = 32 – 48 Final numbers will be determined by physics vs. cost

tradeoff– DOM design:

High QE PMTs, all else same

– Cable design: No DOMs in dust layer Reduce # of quads if possible

– Hole location: Keep holes off runway & away from old station

9

IceCubeSpring

Collaboration Meeting

High Energy Working Group

April 29, 2009

HE 110 – Potential Cable Orders

• Surface to DOM Cables– 24 – 32 Surface to DOM Cables– Exactly the same as previous Surface to DOM

Cables

• Surface Cables– Design not finalized…

Probably 24 – 32 Surface Cables Chance that Surface Cables would not be used and

we would go to clock & power cables. This is the DOM Hub at the hole configuration.

10

IceCubeSpring

Collaboration Meeting

High Energy Working Group

April 29, 2009

Communications Test Plan

• The greatest risk to be mitigated is communications with DOMs over longer cable lengths (up to 3850m). Here is the current proposed test plan:– Test limits:

Still in the process of refining these TCal RMS jitter < 5 ns Successful moat at greatest lengths

– Chamberlin Hall system tests: Various lengths

– SPTS (@ PSL) tests: 800m + 2550m, 1600m + 2550m

– South Pole: Test over Surface Cables with loopbacks on unused special

device quads Lengths TBD

EHWD Reach

4/27TLB

EHWD ReachFactors Possible Solutions

1200’ (366m) Adopted standard None

1500’ (457m) Realistic limit

•Need extension power cables Have most material at Pole

2400’ (732m)

High risk limit of current system, moderate technical challenge to reduce risk

•Voltage drop (power)•Voltage drop (E-stop)•Need more hose•Return H2O pump marginal

•Standalone TOS generator•Step-Up/Down transformers•E-stop remote base station•Wireless network•Boost pump for return H2O?

2400’ (732m) +

Not possible with current system, moderate to major technical challenges to overcome

•Voltage drops•Need more hose•Reduced supply flow (slower drilling)•Return H2O pump undersized

•Standalone TOS generator•E-stop remote base station or alt cable•Wireless network•Boost pump for return H2O•Fork out $$$ for extra fuel

With a target reach in mind, what tests can be done in 09/10 to validate system capabilities?

• Test e-stop reach – hook 2 x 1500’ cables in series• Build and add extension TOS power cable• Test Crrel generator for TOS standalone power (and backup

solution – white Gen?)• Simulate longer reaches on return H2O line to test limits of

pump – install pressure gauge at RWHR for feedback and throttle line

• Test effect of lower supply flow/temp on nozzle selection and drill speed

Some of these activities require engineering and procurement ASAP