Impact of BC2 and BC3 on simulated data, comparison SAMPA MPW2 - - PowerPoint PPT Presentation

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Impact of BC2 and BC3 on simulated data, comparison SAMPA MPW2 - - PowerPoint PPT Presentation

Oct 14, 2023 123 likes •315 views

Impact of BC2 and BC3 on simulated data, comparison SAMPA MPW2 design review II Meeting Konstantin Mnning Universitt Bonn Helmholtz-Institut fr Strahlen- und Kernphysik 01.04.2015 BC2, BC3 operation principle BC2 operation BC3

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SLIDE 1

Konstantin Münning Universität Bonn Helmholtz-Institut für Strahlen- und Kernphysik 01.04.2015

Impact of BC2 and BC3 on simulated data, comparison

SAMPA MPW2 design review II Meeting

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SLIDE 2

2

samples 510 520 530 540 550 560 570 amplitude [ADC] 60 80 100 120 140 160

BC3 operation

BC2, BC3 operation principle

samples 510 520 530 540 550 560 570 amplitude [ADC] 60 80 100 120 140 160

BC2 operation

  • BC2 is calculating average from values within

thresholds

  • BC3 is following the signal limited by slopes
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SLIDE 3

3

samples 540 542 544 546 548 550 552 554 556 558 560 amplitude [ADC] 55 60 65 70 75 80 85

BC3 operation detail

BC2, BC3 operation principle detail

samples 540 542 544 546 548 550 552 554 556 558 560 amplitude [ADC] 55 60 65 70 75 80 85

BC2 operation detail

  • BC2 stays constant during peak data
  • BC3 constantly follows but in a simple

deterministic way

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SLIDE 4

4

amplitude 200 400 600 800 1000 count 50 100 150 200 250

3

10 ×

CM peak amplitudes

simulation parameter

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

  • sampling frequency=10MHz, tp=160ns
  • charge rate=2GHz (constant)
  • Gauss and Landau distributed amplitudes

mean=500 sigma=50 mean=150 sigma=100

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SLIDE 5

5

minimal PSA

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

mean=499.65±0.51 sigma=50.58±0.37 mean=505.09±0.66 sigma=54.64±0.49

  • simple minimal PSA used for

peak evaluation

  • peak amplitude computed

by peak area

  • signal spectrum is altered

by minimal PSA

  • no special handling of piled-

up events

  • Gauss fjt of histogram
  • signal spectrum of PSA is used as a reference to

evaluate the impact of the fjlters to the signal

  • error values from fjt
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SLIDE 6

6

without common mode efgect (1)

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

mean=505.09±0.66 sigma=54.64±0.49 mean=504.47±0.66 sigma=54.58±0.49 mean=499.75±0.66 sigma=54.98±0.49

  • results of both fjlters similar
  • moving average fjlter BC2 is

slightly closer to ideal value

  • slope based fjlter BC3

without slope correction shows larger deviation

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SLIDE 7

7

without common mode efgect (2)

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

mean=505.09±0.66 sigma=54.64±0.49 mean=504.47±0.66 sigma=54.58±0.49 mean=502.40±0.66 sigma=54.52±0.49

  • slope based fjlter BC3 with

simple slope correction is signifjcantly closer to ideal value

  • better correction is possible,

not needed for SAMPA submission

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SLIDE 8

8

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

with common mode efgect (1)

mean=499.65±0.51 sigma=50.58±0.37 mean=505.09±0.66 sigma=54.64±0.49

  • without baseline correction there is a signifjcant

deviation of mean value when common mode efgect is present (right) compared to values without common mode efgect (left)

mean=499.65±0.51 sigma=50.58±0.37 mean=405.75±0.69 sigma=58.61±0.50

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SLIDE 9

9

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

amplitude 420 440 460 480 500 520 540 560 580 600 count 100 200 300 400 500 600

signal peak amplitudes

with common mode efgect (2)

  • with baseline correction the mean value is restored

similarly well by both fjlters

mean=505.09±0.66 sigma=54.64±0.49 mean=504.80±0.66 sigma=54.72±0.50 mean=503.293±0.66 sigma=54.68±0.49

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SLIDE 10

10

amplitude 420 440 460 480 500 520 540 560 580 600 count 100 200 300 400 500 600

signal peak amplitudes

with common mode efgect (3)

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

  • compared to the values without common mode

both fjlters are almost completely eliminating the shift

mean=505.09±0.66 sigma=54.64±0.49 mean=504.47±0.66 sigma=54.58±0.49 mean=502.40±0.66 sigma=54.52±0.49

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SLIDE 11

11

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

amplitude 420 440 460 480 500 520 540 560 580 600 count 100 200 300 400 500 600

signal peak amplitudes

with common mode efgect (4)

  • with baseline correction the mean value is restored

similarly well by both fjlters

mean=505.09±0.66 sigma=54.64±0.49 mean=504.80±0.66 sigma=54.72±0.50 mean=503.293±0.66 sigma=54.68±0.49

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SLIDE 12

12

time [samples] 1100 1200 1300 1400 1500 1600 1700 1800 1900 rate [Hz] 1000 1500 2000 2500 3000

6

10 ×

charge rate function

time [samples] 1100 1200 1300 1400 1500 1600 1700 1800 1900 amplitude [ADC] 100 200 300 400 500 600 700

signal

more realistic simulation

  • charge rate is not constant during data taking
  • simulation with charge rate variation 1-3GHz
  • sine wave variation for simplicity and to

stay within limits of BC2 thresholds

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SLIDE 13

13

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

signifjcant difgerences

  • compared to result without charge rate variation,

BC3 fjlter shows no signifjcant deviation

  • BC2 fjlter is hitting its limits

mean=505.09±0.66 sigma=54.64±0.49 mean=504.80±0.66 sigma=54.72±0.50 mean=503.293±0.66 sigma=54.68±0.49 mean=505.09±0.66 sigma=54.64±0.49 mean=514.21±0.73 sigma=57.40±0.56 mean=502.90±0.67 sigma=54.25±0.50

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SLIDE 14

14

further steps

  • Adjustable slope range must be defjned for

fjnalizing SAMPA fjlter design as bit width of registers must be specifjed prior to submiting the chip for production, this is time critical.

  • A better slope correction needs to be designed if

shown deviations are a concern. This correction would be implemented in CRU/post processing, this is not time critical.

  • More realistic validation/simulation of the fjlters

using AliRoot may be done next week when Marian/Mesut are available.

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SLIDE 15

15

Questions? Comments?

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SLIDE 16

16

Spares

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SLIDE 17

17

Other simulation parameter

  • Simulation statistics: 10000 simulated signal charges per histogram
  • BC2 settings used:

averaging length=8 samples upper=3 ADC lower=6 ADC

  • BC3 settings used:

upward=3/8 ADC/sample downward=6/8 ADC/sample

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SLIDE 18

18

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

amplitude 200 400 600 800 1000 count 100 200 300 400 500 600

signal peak amplitudes

integer/fmoating point

  • simulation calculations done in fmoating point
  • integer simulation difgers only slightly

mean=504.90±0.67 sigma=54.17±0.50 mean=517.66±0.75 sigma=58.57±0.58 mean=502.44±0.67 sigma=54.22±0.50 mean=505.09±0.66 sigma=54.64±0.49 mean=514.21±0.73 sigma=57.40±0.56 mean=502.90±0.67 sigma=54.25±0.50