• The whole instrument• Tests performed• Conclusions

E U S O - B A L L O O N , E U S O - B A L L O O N f l i g h t r e v i e w 0 4 / 0 6 / 2 0 1 4

P. Barrillon on behalf of the many hard workers involved on the instrument

Instrument tests

EUSO-BALLOON flight review 4th June 2014 - CNES

2

The instrument

EUSO-BALLOON flight review 4th June 2014 - CNES

Optics Electronics

PWP

DP

3

The tests performed

EUSO-BALLOON flight review 4th June 2014 - CNES

• Alignment optics/PDM• Complete chain efficiency• Flasher tests

4

Night shits

EUSO-BALLOON flight review 4th June 2014 - CNES

With all lights off in the clean room and the LED off : NIST1 = 0.037 nW NIST2 = ~0.015 nW (noise of the NIST)

5

Alignment

EUSO-BALLOON flight review 4th June 2014 - CNES

Procedure:• With light source at infinity (with a collimator), move the back of the gondola to

align the spot and the PDM. The position of the spot can be checked with white paper and a small camera inside the gondola, or with images from the PDM

• Scurves with the PDM at position 0 on the Z axis (optical axis).• Scurves at different position of the PDM on the Z axis (motor range : +/- 12.5

mm) in order to find the best focal spot.• Same measurements at different wavelengths and incident angles.

6

Efficiency

EUSO-BALLOON flight review 4th June 2014 - CNES

Procedure:• With light source at infinity (with a collimator), we moved the back of the

gondola to align the NIST photo-diode at the focal spot. We took measurements of the light power.

• Realign the gondola with the collimator in order to have the image on the focal plan.

• Scurves with the PDM at focal point• Same measurements at different wavelengths and incidence angles.• See Peter’s presentation for the results

7

Flasher tests

EUSO-BALLOON flight review 4th June 2014 - CNES

2 antennas were set up outside with cables routed to the two clocks inside the clean room

8

Flasher tests

EUSO-BALLOON flight review 4th June 2014 - CNES

9

• Alignment optics/PDM achieved with a nice spot size• Efficiency measurement of the whole chain performed• Flasher tests successfull, even though the trigger

algorithm was not tested with them (only with injected charge).

Conclusions

EUSO-BALLOON flight review 4th June 2014 - CNES