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IceCube Spring Meeting 2007 Parallel Session ++ Future Directions - Acoustic. Rolf Nahnhauer DESY. SPATS. Freija Descamps Justin Vandenbroucke. Deployment successful Detector operates well Data taking ongoing First preliminary results available.

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slide1

IceCube Spring Meeting 2007

Parallel Session ++Future Directions - Acoustic

Rolf Nahnhauer

DESY

Rolf Nahnhauer IceCube Spring Meeting

slide2

SPATS

Freija Descamps

Justin Vandenbroucke

Deployment successful

Detector operates well

Data taking ongoing

First preliminary results available

As usual for start of an experiment in an unexplored region:

more questions than answers

Rolf Nahnhauer IceCube Spring Meeting

slide3

Unexpected Mysteries

1) Holes freeze (partly?) from below

2) Width of gaussian noise is ~twice as large as in laboratory- or lake tests and increasing in time

3) Clear peaks seen in noise spectra at f > 50 kHz which never have been observed before

4) Noise peak frequencies depend on string location and increase with depth

5) Signal strength in general much smaller than expected from water tests

6) Many transmitter-sensor combinations not seen at all

7) No transmitter signals seen from above 140 m

Rolf Nahnhauer IceCube Spring Meeting

slide4

Future Plans for Analysis

A5B5

A5C5

t / 2.5µs

t / 2.5 µs

Do better signal extraction (fit, first peak only, etc.)

Use timing for signal identification

Include refraction effects

Use Fourier filters for background reduction

Take more statistics for averaging

+++ many other ideas

Rolf Nahnhauer IceCube Spring Meeting

slide5

Further talks

Development & Test of Acoustic Sensors for IceB. Semburg, K. Helbing, T. Karg

Status of the Aachen Acoustic Laboratory

C. Wiebusch

The New Zeuthen Acoustic Test System

D. Tosi

The Dead Sea for Acoustic Neutrino DetectionD. Cohen

Rolf Nahnhauer IceCube Spring Meeting

production of hades
Piezo-ceramic

62.5 kHz resonant frequency

Amplifier

PUR hard (black colored)

Production of HADES

T. Karg

2 cm

2 cm

Produced by Christopher Naumann at University of Erlangen-Nürnberg.U Erlangen-Nürnberg produces acoustic sensors for ANTARES

Rolf Nahnhauer IceCube Spring Meeting

slide7

4.5 m

3.0 m

3.5 m

Plan

C. Wiebusch

  • Motivation: have a multi-purpose test laboratory for
    • Verification of the thermo-acoustic effect in ice
    • Development of acoustical sensors
    • Calibration of acoustic sensors
  • Sufficient lab-space and infrastructure available in Aachen.
  • Two main sites:
  • Laboratory for sensor development,etc.
  • Cool room with tank for testing
  • Central Element: Ice-Top Tank
  • and FCU(provided from UWgraduate school)
  • -> arrived in Aachen in March(Thank you Albrecht, Tom, Chris, ....!)

Rolf Nahnhauer IceCube Spring Meeting

slide8

The New Zeuthen Acoustic Test System

D. Tosi

PC/104

Standard Laboratory

PWR supply

up to 7 sensors +

7 transmitters

?

PC desktop

?

+ Freezer

+ Lake

+ other facilities

external IRIG-B signal from

IceCube GPS system ET6000

Rolf Nahnhauer IceCube Spring Meeting

the measurement
The Measurement

D. Cohen

Work by Yizhaq Makovsky

Useful advice and help from Justin

Thanks to E. Waxman

Rolf Nahnhauer IceCube Spring Meeting

slide10

Acoustic Neutrino Detection Working Group

SAC-PAP recommendations , March 2007:

xx

First wg meeting: Friday, 28th of April , Lake Geneva

Group members: Aachen, UC Berkeley, DESY, Gent, Lausanne, Stockholm, Uppsala, Wuppertal + individuals from different labs

Convener: RN - for period until spring 2008 IC meeting

Rolf Nahnhauer IceCube Spring Meeting

slide11

Aim of AND working group

Combine all efforts from different sites

- ideas, money, person-power -

for an R&D programme with the goal to prepare part of the basis of a 100 km3 hybrid detector

Near Future Plans

Deploy one string with improved acoustic technique in next season

Build movable pinger for use of transmitting sound from different depths in different IceCube holes to acoustic strings

Design deeper acoustic string array for deployment in 2009 (E/L)

Do lake ice test at Abisko for studying ice properties in „lab“

Do in-ice calibration of sensors and transmitters

Rolf Nahnhauer IceCube Spring Meeting

slide12

Scenario for 07/08 Deployment

Make new string 100 m longer

Don‘ t put stations at80 m and 100 m

Add stations at 430 m and 500 m

Use three upgraded SPATS stations at 250 m, 320 m, 500 m

Put loud transmitters at 190 m and 430 m

Use 140 m, 190 m,400 m and 430 m for new glaciophones,if available

76

X

X

New:

hole 76, 7th of next season

430 m

500 m

Rolf Nahnhauer IceCube Spring Meeting

slide13

The Global Picture

Should not forget the final goal:

Build a hybrid optical-radio-acoustic detector of ~ 100 km3 instrumented volume around icecube, ready for operation in ~10 years (2017)

Outer boundary conditions require to stay with this time scale

BUTPreliminary SPATS results do not allow to go full speed aheadProgramme described will need at least another year

How to fight one year delay on an already tough time scale ?

- Attract more collaborators - Cooperate better with radio - Do things now, which already can be done (without knowing, if acoustic stays an option)

Rolf Nahnhauer IceCube Spring Meeting

slide14

Do Never Forget the Basic Message for GZK Detection

hybrid

hybrid

hybrid

hybrid

hybrid

Ice only material for three technologies in one detector: optical-radio-acoustic

Numerous advantages have been discussed already, will not be repeated here

What is the prize of GZK neutrinos?

my guess: O(10 Mio $)/piecefor first ~20 pieces

Several cheap attempts done in recent years: may have seen one - but never discovered it

Rolf Nahnhauer IceCube Spring Meeting