The 2009 Deployment Tour

Matthew Newcomb

The hole shrinks by 15 cm on the diameter every 24 hours

A DOM requires at least 45 cm on the diameter or it will get stuck

One string costs ~ 1 million dollars

You guessed it! Getting a string stuck is BAD!

Before You Start:

How much time do you have to deploy a string?

Introducing lifetime: lifetime is the number of hours from the time the drill leaves the hole to the time that the any point on the hole reaches the minimum 45 cm.

Okay, so how do I know the lifetime of a hole?

Introducing hole lifetime modeling: See http://driller.icecube.wisc.edu/

Is this enough?

It's a start, you should look at all of the drill data.

What is available?

Drill CalipersFlow RatesWater Temperature

What Tools Do We Have To Measure The Hole?

Drill Head Calipers

What Do You Think Of This Hole?

How Do You Know When The Drill Is Out Of The Hole?

Quasi-Real Time Data Available On The Web

Setting Up:

The user interfaces and controller software must be started in deployment mode. If unsure, and drilling is finished, close both user interfaces and the drill control software. Then start the deployment version of both.

Cabling:

Connect DDB cable to the deployment reel and to the DDB.

Unico drives must be in deployment mode. They will automatically go into this mode when the deployment reel is connected

What Does A String Look Like?

500 lbs

Paro

Keller

Load Cell

Note: Drawing Not To Scale

PayoutSensor

Paro? Keller? What's That?

Keller

Paro

Two Different Pressure Sensors? Why? $$$ Paro $7K, Keller $700

Keller:

It's a 4-20mA current source that is proportional to the pressure applied to it. That proportion changes depending on the keller. You MUST tell the computer the keller's serial number.

If you have the pressure at some point in the hole you can getthe depth. A rough value:

depth in inches = (pressure sensor value in PSI * 27.68) - (ambientpressure in mBar * 0.535 * 27.68 )

Note the ambient pressure! Double check the ambient air pressure!

Pressure Equals Depth

What are these?

Does everything always work right?

What do you do if one sensor reads an unexpected value?

What do you do if more than one sensor reads an unexpected value?

Discussion

How long does deployment take?

Closing:

All of the data from last year is available on the web:http://driller.icecube.wisc.edu/media/history/2008-2009/index.html

Look at them. If you have questions, or what to know somethingnot covered here. Email me:

mnewcomb@wisc.edu