AD horn pulse length Marco Calviani Oct 2018

AD horn pulse length Marco Calviani, Oct. 2018 As already mentioned, we believe that this different should be negligible for the horn. Edmundo Sola, Nov. 2018 The difference in pulse shape should be negligible for the horn. The calculations performed in the past showed a high safety factor with respect to the material limits for a peak current of 400 k. A (operational = 378 k. A), and a higher integrated current (see picture attached).

Currents by Gregor and EN/STI Horn current old. IPEAK = 378 k. A at 17. 5µs Horn current new. IPEAK = 378 k. A at 19. 5µs GREGOR Horn stress: Integral i 2 dt 2. 95× 106 EN/STI A 2 s 3. 31× 106 A 2 s • Comparing the operational horn current (old) with the test-bench current (new). • Peak current is 378 k. A for operational waveform. Test-bench waveform has been adjusted for same peak current. • Capacitor banks are 720µF (old) and 900µF (new). • Adjusted capacitor bank voltage for test-bench would be 5. 9 k. V. 03/10/2018 AD Horn currents 2

Currents by Gregor and EN/STI Horn current old. IPEAK = 378 k. A at 17. 5µs Horn current new. IPEAK = 378 k. A at 19. 5µs Horn stress: Integral i 2 dt 2. 95× 106 A 2 s 3. 31× 106 A 2 s EN/STI calculation Present GREGOR’s simulation 03/10/2018 AD Horn currents 3

Conclusion Consequences of replacing operational cubicles with test-bench cubicles (by GREGOR): • Ripple current is eliminated with RC-snubber circuits. • Capacitor bank increase from 720µF to 900µF. • Capacitor bank voltage reduces from 6. 2 k. V to 5. 9 k. V. • Pulse width increases by 12%. • Horn stress increases by 12% from 2. 95× 106 A 2 s to 3. 31× 106 A 2 s for identical peak currents of 378 k. A. EN/STI agrees according to their past calculations 03/10/2018 AD Horn currents 4