High Elevation Auger Telescopes and Tilt Monitoring Nils ScharfNils Scharf

3. Physikalisches Institut A3. Physikalisches Institut ARWTH Aachen UniversityRWTH Aachen UniversityAstroteilchenschule ErlangenAstroteilchenschule Erlangen11.10.200811.10.2008

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Outline

The Pierre Auger Observatory Physics Motivation High Elevation Auger Telescopes : HEAT Tilt Monitoring Summary and Outlook

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The Pierre Auger Observatory24 fluorescence telescopes

one of four FD buildings

(with 6 telescopes each)

Water-Cherenkov detector station

> 1600 surface detector stations

Amarilla

Morados

Coihueco

Leones

Southern site near Malargüe, Argentina

12 tons of water

~30000 events

> 1018.5 eVData taking since 2004/01

Completed 2008

HEAT

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Physics Motivation for the Extension of the Energy Range

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Shower Detection with Baseline Telescopes Shower only

reconstructed when shower maximum in field of view

Geometric bias for low energy showers

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High Elevation Auger Telescopes

3 additional telescopes close to existing FD building

Field of view from 30° to 60°

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HEAT Properties Measurement of cosmic rays with

energies down to 1017 eV Measure composition of cosmic

ray primaries Only 3 additional telescopes

needed (high statistics at low energies because of steeply falling spectrum)

Small distance to existing FD building allows for crosschecks with showers seen in both components

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HEAT SheltersMaintenance Position

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HEAT ShelterData taking position

H. Klages

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Tilt Monitoring Inclination of HEAT shelter leads to changes of

relative position inside the optics system Do these changes affect shower reconstruction? => Measure distances and inclinations inside

HEAT shelter If the changes are larger than design tolerances:

modify mechanics If the changes are still too large: Include them in the

optic reconstruction

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Hydraulic Designin AachenTilt Monitor Designand Test Setup:J. Calvo, Aachen

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Test Setup ofTilt Monitoring System System of

4 distance 4 inclination 3 temperaturesensors installed in bay 6 of Los

Leones FD building Goal: Measure distances

and inclinations with a resolution ten times better than design tolerances of 0.5 mm und 0.1°

Diploma Thesis: J. Calvo

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Test Setup

J. Calvo

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Example 1: Distance Variations

Variation of 0.1 mm for the distance Shutter – Mirror with temperaturevariation of 2° CMeasured variations much smaller than design tolerances of 5 mm

J. Calvo

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Example 2: Inclination Variations

Measured variations in inclination smaller than 0.05° for temperature differences of 2 °C.Smaller than design tolerance of ± 0.1°.

J. Calvo

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Outlook

Shower detection with first HEAT telescope by the end of 2008

Measurement of cosmic rays with energies down to 1017 eV (spectrum, composition,…)

Installation of tilt monitoring system in each HEAT telescope

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End

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Backup Slides

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segmented spherical mirror

aperture box:shutterUV pass filtersafety curtain

corrector lens

440 PMT camera1.5° per pixel

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Expected Energy Range for HEAT HEAT will

lower the Energy range of the Pierre Auger Observatory from 1018.4 eV to 1017 eV

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Test Setup: Distance Sensors

J. Calvo

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Test Setup: Inclination Sensors

J. Calvo