Mini-1 VMM2 Presentation of measurements done at Technion . - PowerPoint PPT Presentation

Results from tests done lately Mini-1 VMM2 Presentation of measurements done at Technion . 3/11/2015 Technion Alex & Nachman 1

Content • Revisit the problems related with the sTGC PAD High Capacitance. • Revisit the dynamic range , Linearity for VMM2 without protection diodes. • A suggestion for an additional mode of work for VMM3. • The experience after working with 3 Mini-1. Two with protection diodes and one without protection diodes. 3/11/2015 Technion Alex & Nachman 2

Setup. The improvised adapter to Mini-1 input, the simulated PAD capacitance of 1 nF , the injection capacitor of 10 pF, the termination 51 Ohm termination resistor for the injection cable when external signal is used. 3/11/2015 Technion Alex & Nachman 3

Mini-1 VMM2 without protection diodes # 0009 R • Fig 1. Ch 2 , Cd = 0 pf , G =1mV/fC , 25 ns PT, internal test pulse 200 u Vadc = 186 u. • Fig 2. Ch 2 , Cd = 2000 pF , G =1mV/fC , 25 PT, internal test pulse 200u Vadc= 115u • Fig 3. Added Sc set. Output is unstable. Fig 1. Fig 2. Fig 3 3/11/2015 Technion Alex & Nachman 4

Mini-1 VMM2 without protection diodes # 0009 R • Fig 4,5 Ch 2 . Cd=2000 , G 1mV/fC input internal pulse 400u , Sc set , Output not stable • F1g 6. PDO output of ADC Fig 5. Fig 4. Fig 6. 3/11/2015 Technion Alex & Nachman 5

Mini-1 VMM2 without protection diodes # 0009 R Cd=2nF Fig 7. Example of response with external signal ~ 2 pC, Sc set. Fig 7. 3/11/2015 Technion Alex & Nachman 6

Mini-1 VMM2 without protection diodes # 0009 R • Fig 8. Ch 2 , Cd = 1000 pF , G =1mV/fC , 25 PT, external test pulse 400fC, Sc set, • Fig 9. Ch 2, Cd = 1000 pF , G = 1 mV/fC, 25ns PT, internal test pulse, 230u Fig 8. Fig 9. Int. TP Single pulse out. 3/11/2015 Technion Alex & Nachman 7

Dynamic Range of Output Signal Revisited Without Diodes With Diodes 0003 R Mini-1 0009 No diodes Ch2 G=3mV/fC Ch-6 PDO analog mV Gain=3 mV/ fC PT=25 ns Cinj=10 pF 700 900 600 800 500 700 Analog PDO mV Vout mV 600 400 500 Vout Monitor 300 400 300 Vout PDO 200 200 100 100 0 0 0 100 200 300 400 500 600 0 100 200 300 400 500 600 700 800 Charge fC Injected charge pC 3/11/2015 Technion Alex & Nachman 8

The experience working with three Mini-1. All the VMM2 are working. • After finding a way around the problem with readout of only 4 data out of Mini-1 and CDAC board, we could have measurements for any length of time and number of events. • Results of internal TP 230 u on Ch 28 ,Th=170 G=3nV/fC , Cd=0. Fig 10 all ch. not masked Fig 11 all other ch. Masked 3/11/2015 Technion Alex & Nachman 9

A suggestion for a additional mode of work for VMM3 • A new feature on the VMM3 , namely a mode in which the internal ADC measure the Pedestal ( Base-Line ), without any signal. • In our opinion, this feature is a desirable one ,a measurement which is done any way in the calibration process of each channel. • It could save a lot of time and effort in real life . 3/11/2015 Technion Alex & Nachman 10

Conclusions: • More work is to be done. • Next step : connect Mini-1 to sTGC chamber. 3/11/2015 Technion Alex & Nachman 11