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.

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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.

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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

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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 4. Fig 5. Fig 6.

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Mini-1 VMM2 without protection diodes # 0009 R

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Fig 7. Example of response with external signal ~ 2 pC, Sc set. Fig 7. Cd=2nF

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

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Fig 8. Fig 9. Int. TP Single pulse out.

Dynamic Range of Output Signal Revisited

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100 200 300 400 500 600 700 100 200 300 400 500 600 700 800

Vout mV Injected charge pC

Mini-1 0009 No diodes Ch2 G=3mV/fC

Vout Monitor Vout PDO 100 200 300 400 500 600 700 800 900 100 200 300 400 500 600

Analog PDO mV Charge fC

Ch-6 PDO analog mV Gain=3 mV/ fC PT=25 ns Cinj=10 pF

Without Diodes With Diodes 0003 R

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
• ut 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.

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Fig 10 all ch. not masked Fig 11 all other ch. Masked

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 .

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Conclusions:

• More work is to be done.
• Next step : connect Mini-1 to sTGC chamber.

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