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DAQ deadtime memoKaz, Grass

2012/01/04

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Current dead timeDead time measured on 2011/09/29 With TDCmax=4, Deadtime =350 us With TDCmax=8, Deadtime =690 us With TDCmax=13, Deadtime =1850 us

In our plan, the TDCmax=9 Dead time < 800us 1K HZ trigger is fine, however

Input by Cosmis trigger~ 3000Hz Event Rate TS Busy

Dummy (no TDC data) ~3000 Hz 24.5 us

None-ZeroSuppression, BLK mode ~40 Hz 2.15 ms

Zero-Suppression by CRL code, address only mode

~200Hz 4.2ms

Zero-Suppression by CRL code, BLK mode ~325Hz 2.5ms

Zero-Suppression fixed the Data transfer dead time.

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ROC Name TS 2 9 4 10 6 7 5 3 8 TDCFreq(Hz)

TS Dead(ms)

Detector C2 C2 H1H2

C1 C1 H3H4P4

C3-

C3-

C3+

Branch B1 B2 B3 B4

Max. TDC 0 6 6 4 9 9 4 10

9 13

300 3.15

TDC on . . . . . . . . . . 6000 24.68us

. 6 . . . . . . . . 730 1.15

. 6 6 . . . . . . . 730 1.15

. 6 6 . 6 . . . . . 724 1.154

5500 on . 6 6 . 6 6 . . . . 440 2.07

. 6 6 . 6 . . 6 6 . 720 1.17

. 6 6 . 6 . 6 6 6 6 720 1.17

. . . . 9 . 9 9 9 9 500 1.72

. 6 6 . 9 . 9 9 9 9 500 1.72

. 6 6 . 9 6 9 9 9 9 440 2.07

. 6 6 . 9 9 9 9 9 9 300 3.15

6100 on Max TDC on 0 6 6 4 9 9 4 10

9 13

360 2.46

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MVME 5500 6TDC for 2.07 ms 0.35 ms per TDC

MVME 6100 6TDC for 1.15 ms 0.19 ms per TDC

MVME5500 increase 76 % of dead time

We should put 5500 in the crates with less TDC

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With this plan the Max number of TDC is 9 The dead time will be 1.72 ms.

ROC Name TS 2 9 4 10 6 7 5 3 8 TDCFreq(Hz)

TS Dead(ms)

Detector C2 C2 H1H2

C1 C1 H3H4P4

C3-

C3-

C3+

Branch B1 B2 B3 B4

TDC on . . . . . . . . . . 6000 24.68us

9 9 9 9 9 500 1.72

. 6 6 . 9 6 9 9 9 9 440 2.07

Max TDC on 0 6 6 4 9 9 4 10

9 13

360 2.46

Max TDC on 0 6 6 4 9 9 4 10

9 13

360 2.46

MVME 5500 on

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320 ns time window for Chambers The prop tube still need 640 ns time window, but

the max TDC in one ROC will be 4.

ROC Name TS 2 9 4 10 6 7 5 3 8 TDCFreq(Hz)

TS Dead(ms)

Detector C2 C2 H1H2

C1 C1 H3H4P4

C3-

C3-

C3+

Branch B1 B2 B3 B4

TDC on . . . . . . . . . . 6000 24.68us

4 4 4 9 9 4 9 9 9 713 1.19

Max TDC on 0 4 4 . 9 9 4 9 9 9 913 0.88

Max TDC on 0 4 4 4 9 9 4 9 9 9 913 0.88

MVME 5500 on 640 ns time window

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Beam Channel number

TDCs For the Fist Run

ROC VMEnow

CPUnow

TIR

St1 Hodos Right 2 1(4TDC+ 1Trigger recoder+ 5v1495)

(5500?)

1 1 1St2 Hodos Right 2

V1495 Right 1

St2 Chamber Left 800 12 2(6+6) 2 2 2St1 Chamber Right 1152

(1124)

18 (33 for the second run)

2(9+9) 2 2 2

St3 + Chamber Right 784 13 2 (6+7) 1 1 1St3 - Chamber Left 1184 19 3(6+6+7) 2 2 2St3 Hodos Right 1 (4 +9*2=22

~22 TDC dead time)

3(8+8+6) 1 1 1

St4 Hodos Right 3St4 Props Right 576 9

(64 clocks time window, twice the TDC dead time)

TS Right 3 (latch) 1 1 1 1Not using 4 2+1 4

On it’s way to Fermi 22

?

Total 82 14 14 13(15)

14(14+?)

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Conclusion 320ns time window -Chambers 640ns time window – Proptubes 14 MVME6100 CPUs Software Zero suppression

The deadtime is 880 us. For the 6000Hz input cosmic ray test we can get 913 Hz event rate.