1. ACD Backsplash test at CERN in 2002
Published in AstroParticle Physics, 2004 (Moiseev et al.)

2. 9 8 D 7 6 5 4 3 2

3. E, GeV 10 20 50
100
200
250
D,cm
Calorimeter
Test
Sim
Sn, 7.9X0  30 45
Pb, 7.9X0
Pb, 17X0
Pb, 30X0
Fe, 7.9X0 60 80
Background

4. Backsplash spectrum in ACD Energy dependence of backsplash

5. Distance dependence Material dependence (same # of X0)

6. Backsplash prediction for LAT
Works for LAT calorimeter (8-10 X0 of CsI)

7. This prototype was tested at SPS CERN in September 2004
Beam test at CERN
This prototype was tested at SPS CERN in September 2004
We had to be here instead of there (Monblan)
It was very challenging to build real instrument for ~ $60K (many thanks to Tom Johnson, Deneen Ferro, Dawn Blackburn, Bill Daniels, Nick Kwiatkowski, Tom Huber …)
Finally, to our common surprise, we:
got it assembled on a beam - happy!
made it running -very happy!!
obtained results which from the first glance did not contradict with common physics - no words!!!
Data analysis is on a way

8. Start… maybe stop right now?
Trimming lead plates –
GOOD JOB, professors!
First 2 of 20 panes made -
look not so bad so far…

9. Built! What a monster!
On a beam! See sparkling protons
Results!

10. Good-bye! Why not to try that now?