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Understanding Attenuation Settings in AGS Shaper Board Calibration

Exploring the intricacies of AGS shaper board attenuation settings for precise calibration in scientific experiments. Detailed observations and insights shared for clarity and optimization of signal processing.

seth-perkins
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Understanding Attenuation Settings in AGS Shaper Board Calibration

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  1. So-called factor of ~2 problem • Just to share my experience of what I have found … Kin Yip C-AD Nov. 6, 2008

  2. Long time ago, I made a picture of the attenuation settings in the AGS shaper board. • putting in a terminator turns off the LED (~kind of opposite); • it can also be set by software talking to the CAMAC chassis; • attenuations are very rough. http://www.c-ad.bnl.gov/kinyip/AGS-CNI/attenuations.gif

  3. With an input signal of amplitude of ~0.34 V (square wave, NEG) directly to the shaper board--- which allows me to test all valid attenuations at once, I'd see : would give me ~220 (+/-20 or something) on ADC with the so-called attenuation 1/1; would give me ~110 (+/-10 or something) on ADC with the so-called attenuation 1/3;would give me ~55 (+/-10 or something) on ADC with the so-called attenuation 1/5;would give me ~25 (+/-10 or something) on ADC with the so-called attenuation 1/10;     So, the attenuations of 1/3 is more like ~1/2.x, and 1/5 is more like ~1/4 and 1/10 is ~1/9, roughly speaking.

  4. In the 2008 run, both terminators were plugged •  attenuations ~1/10. • But traditionally (pre-2008 runs) --- which can be viewed from the yljet.ini : • OutReg=0x1000 // Set output register. Bits: - normal run • // ….. • It’s setting one of the 2 bits and that if you let the software set, you'll see that the LED's show ON/OFF --> the 1/5 --- which is also verified by pulse signal expts.

  5. Injecting a pulse signal (NEGative square wave) of 0.344 V directly to the shaper boards with all the signal channels terminated in the usual setting and with ~1/3 attenuation, one would see the following:

  6. If one sends a signal (NEGative square wave) of 0.588 V to the pre-amplifier in the RHIC tunnel with termination by a T (one side to terminator and the other side to pulse signal) with ~1/5 attenuation (at the shaper boards), you'd see:

  7. With ~1/10 attenuation, the calibration () signals with the entire chain of real detector & electronics look like the following (with a peak near 110) : The calibration (~energy/ADC) in the calibration file  very roughly ~50 etc.

  8. With ~1/5 attenuation, the calibration () signals with the entire chain of real detector & electronics look like the following (with a peak near 220) : with fan off Just like in the past years, the calibration (~energy/ADC) in the calibration file  ~22 or 25 etc.

  9. Same but with fan on :

  10. Last words : • In HJET setup, the attenuations in calibration and normal data taking are the same. This “good” feature renders people not to remember what the attenuations should be. • The factor of 2 is due to the attenuation differences. • It’s different for the CNI and somehow I have had to remind myself at least once a year what the attenuations for calibration and normal data taking in AGS are.

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