03-27-2015

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Investigation of the nature of the secon peak in the second hit mode.

1. LED is in non-updating mode, 30 mV threshold, 40 ns pulse width:

Secon hit det1 30mV LED.png

2. LED is in updating mode (in hope to get rid of the second pulse), 30 mV threshold, 40 ns pulse width:

Second pulse is still there.

Secon hit det1 30mV LED updating.png

Another case of the second pulse appearance (same conditions):

Secon hit det1 30mV LED updating2.png


Run # (multihit data) Description
4502 Cosmic rays test, DAQ is triggered by Det #1 (bottom, multihit TDC9), HV(Det#1) was reduced to -1150 V, LED threshold on the signal coming from the top of Det#1 (multihit TDC8) was set to 255 mV (30 mV all others) and fed into CAEN N93B Dual Timer. The pulse width was increased by the timer to 60 ns. Let's see where in the timing spectrum of the second hits we can observe the spikes due to the ringing.

Cosmic runtest increased stopwidth.png

First hit (Det1 top):

Cosmic runtest first hit.png

Second hit (Det1 top):

Cosmic runtest second hit.png

Second hit (Det1 top) - First hit (Det1 top):

Cosmic runtest T8 2 T8 1.png

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