derek mckay-bukowski - eiscat · 19-may-2011, e3d users' meeting, uppsala 2 derek...

19-May-2011, E3D Users' Meeting, Uppsala 1

Derek McKay-BukowskiVolunteer Project Engineer, with support fromSodankylä Geophysical Observatory and STFC

19-May-2011, E3D Users' Meeting, Uppsala 2

Derek McKay-BukowskiVolunteer Project Engineer, with support fromSodankylä Geophysical Observatory and STFC

KAIRAKilpisjärvi Atmospheric

Imaging Receiver Array

LOFAR-Finland FI609

19-May-2011, E3D Users' Meeting, Uppsala Derek McKay-Bukowski, SGO & EISCAT-UK 3

KAIRA is a new VHF passive receiver system, which serves 3 main roles:

• Powerful expt. in its own right

• Test bed for EISCAT_3D

• Valuable extension of the LOFAR array

LOFAR

EISCAT

KAIRA

24-Jan-2011, Birmingham Derek McKay-Bukowski, SEPnet, LOFAR-UK 4

• Complete– 20 core stations

• Incl. SuperTerp

– 7 remote stations

– 6 international stations• 4 × Germany

• 1 × UK

• 1 × France

• Additional stations planned– 2 × Germany, 3 × Poland... and others!

• Still under construction

– 4 core stations

– 10 remote stations

• 9 × Netherlands

• 1 × Finland (Kilpisjärvi)

– 2 international stations

• 1 × Germany (Jülich)

• 1 × Sweden (Onsala)

• Solar imaging1fps@135MHZ

• All-sky imaging

• Simultaneous pulsar measurements

• Long-baseline, sub-arcsecond imaging

• Polarimetry

• Jovian spectroscopy100 fps@22MHz

• Plus IPS, Cosmic Rays, etc.17-Mar-2011, Sodankylä Derek McKay-Bukowski, SEPnet, LOFAR-UK 5


• HBA (High Band Array) 120-240 MHz ... cf. E3D!

– 5m×5m tile, containing 16 crossed-dipoles

DE603 Tautenberg


• LBA (Low Band Array) 30-80 MHz

– Angled dipole, ground plane, LNAs

DE604 Potsdam


• LOFAR is split into stations

– Each combines HBA, LBA and DSP

150m

HBA

LBA

RF-container

UK608 Chilbolton

07-Sep-2010, SGO, Sodankylä Derek McKay-Bukowski, SGO & EISCAT-UK 9

• Standard station configurations

• Kit-like assembly

– 96LBA + 96HBA

48HBA + 96LBA

2×24HB + 96LBA


• KAIRA = Modified remote station

• Semi-sparse array, full RF-capacity

– 96LBA + 96HBA

48HBA + 96LBA

2×24HB + 96LBA


• The centre of LOFAR is the SuperTerp

– As mentioned in Richard Fallow’s IPS talk earlier

340m

Superterp, Exloo


• Located at Kilpisjärvi (not far from the Riometer)

– Closest Finnish point to the Tromsø VHF transmitter

Tromsø VHF


Tromsø VHF

• 1.6 MW tx at224 MHz

• In HBA freq. range(120–240 MHz)

• Similar to proposed E3D frequencies


• Site for HBA... on roadworks spoil

– Challenge : Hard, rocky ground, frost, snow

• LBA located below the HBA

– Challenge : Peat, frost, snow, more snow.


• LBA to be located on the tundra below the HBA

– Challenge : Tundra/peat, frost, snow, more snow.


• Ground survey

– 08-Sep-2010

Photograph: Markku Postila


• RFI survey

– 23-Sep-2010



• Geo-survey

– Subterranean trailing radar



• Two HBA tiles deployed 19-Oct-2010

– Ground tile and raised tile.

Photograph: Thomas Ulich


• Fortnightly checks throughout winter



• Winter-testing completed. Both tiles survived.

• Will increase the frameset to 1.5m height

Ground test tile

1m-highframeset

Saana

Raised test tile

KAIRA HBA area

Pikku Malla

Storage area


• Snow loading

– 7.65 tonnes of compacted snow/ice

Summit ~1.5m

0.6m high HBA tile

1.0m frame

Each load between500 and 1000kg

7650kg total

15t digger

Measuring system used to assess applied load


Collapse!


• Destroyed tile has been dissected

• Full photographic sequence and part inventory

• Failure-modes and local loading pressures... TBD

• Assessment of frame support and structure

• Remaining tile dismantled; intact parts kept

• Disposal of debris

• Ground-tile stripped, repaired and moved

• Now in storage, as spare and expansion19-May-2011, E3D Users' Meeting, Uppsala Derek McKay-Bukowski, SGO & EISCAT-UK 26

• Site clearing

– Test-kit, snow (for thaw), documentation and layout


• Delivery of 336 frames

– 16-May-2011



Schedule for remainder of 2011

• 12th May – Final snow clearing, destructive testing• 16th May – Delivery of frames• 6th June – Start of site surveying and preparation• 18th June – Surveying for final HBA layout• 4th July – Start of HBA deployment• 25th July – Cabling commences• 1st August – HBA and electronics ready• Winter 2011-2012 – Testing with Tromsø VHF• Summer 2012 – Installation of the LBA

Active outreach campaign... multiple web-updates each day during the main part of the build. Web-log, Twitter, photo-gallery, articles, news, links, etc.

19-May-2011, E3D Users' Meeting, Uppsala 3019-May-2011, E3D Users' Meeting, Uppsala 30

@KairaProject

http://kaira.sgo.fi/

Tune in to Thomas Ulich’s two presentations onKAIRA science and the outreach programmes

With thanks to the entire KAIRA team at the Sodankylä Geophysical Observatory,as well as countless others from the RAL, FMI, LOFAR, EISCAT and SKA communities.

Thanks also to the EISCAT-UK support group and to RAL for their support for this visit.And finally, special thanks to Izabela, without whom none of this work would be possible.

19-May-2011, E3D Users' Meeting, Uppsala 3119-May-2011, E3D Users' Meeting, Uppsala 31

@KairaProject

http://kaira.sgo.fi/

Tune in to Thomas Ulich’s two presentations onKAIRA science and the outreach programmes

With thanks to the entire KAIRA team at the Sodankylä Geophysical Observatory,as well as countless others from the RAL, FMI, LOFAR, EISCAT and SKA communities.

Thanks also to the EISCAT-UK support group and to RAL for their support for this visit.And finally, special thanks to Izabela, without whom none of this work would be possible.

derek mckay-bukowski - eiscat · 19-may-2011, e3d users' meeting, uppsala 2 derek...

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