Trigger Report

UIC Group

012605

Outline

• Trigger Status– Update of trigger work

– Problems found and its solutions

– T0s’ satellites – beam leakage from central orbit

• Current and future trigger work

• ZDC Calibrations

• Bzero Runs Report

General Trigger Status

• Trigger declared commissioned starting with run 16185 (on 1/12/05).

• Few problems have been found along the way, none of them however have jeopardized the integrity of the data taken

• Trigger has stable for a couple of weeks now

• No mayor changes planned for the trigger in the near future

• Concentrating now in monitoring and software side of the trigger

Bit 

Bit Name On/Off Scaledown

0 PN 0 0 1 PP 0 0 2 T0N 0 0 3 T0P 0 0 4 PN*PP_WIDE 1 - 5 T0N*T0P_NARROW 1 - 6 SPEC*TOF 0 - 7 CC/N 0 - 8 HEARTBEAT_L0 0 - 9 TIMECAL 1 -

10 PEDESTAL 0 - 11 PCAL_COSM 0 - 12 SPEC_LED 0 - 13 ZDCTRIG_L0 0 - 14 CC 1 - 15 VETO 1 -

Trigger Configuration CuCu200IsColVertex

Start Validity time 01/19/2005 18:22:02

L0

Bit 

Bit Name On/Off Scaledown

16 L0 1 1024

17 PP*PN(n)_NARROW 1 64

18 PP*PN_NARROW 0 0

19 PP*PN_WIDE 0 0

20 T0N*T0P_NARROW 1 256

21 Spare 0 0

22 PP*PN_beamgas 0 0

23 (T0N*T0P)*VTX 0 -

24 HEARTBEAT_L1 1 -

25 PP*PN(n>0)*ZDC 0 -

26 PP*PN(N>0)_IsCol 0 -

27 VTX(T0)_IsCol 1 -

28 UTM 0 -

29 ZDCTRIG 0 -

30 Spare 0 -

31 BUSY 1 -

L1

Update of trigger work 1

• TEQ values for T0 counters finalized.

• TAC settings finalized and stable

• CuCu200Veretex trigger configuration finalized and stable

Minimum Bias Runs (PdlWideOpen )

CuCu200Vertex Runs

Update trigger work 2

• TEQ values for paddle counters set and stable

Before TEQ

After TEQ

Problems and its solutions

• Level 1 efficiency problem found due to fast clear problem. Solved by routing the FC TDC signals using a cable in the FB front panel.

• Deficiency on the number of counts from one of the negative T0 counters (8). The problem was due to a problem with the FB time calibrations

• Serious problem with the paddle OR, significant shift in the paddle time difference. Problem was due to processing of the data with different FB calibrations.

• TDC 4 problems, or widening of the peaks of the calibration spectra for the paddle counters. The cause for this was at the end correlated to the increase of the rate of the time calibrator.

T0’s satellites

• Based on studies, these events seem to be real collisions that are induced by collisions among the beam’s satellite bunches, that is, beam leakage from central orbit .

Minimum Bias Runs (PdlWideOpen )

• The number of collision events from the central bucket seems to depends on the store and store’s age.

T0’s satellites for CuCu200Vertex runs

• Percent of events from central buckets much larger due to the cut in the vertex trigger

ZDC Discriminator Thresholds

ZDC Calibrations

• Identify and set the 1n peak in different ADC channels (total sum, and individual modules) to 100 GeV or 1 neutron

• For hardware sum the resolution seems to be better for negative that for positive side

ZDC Calibrations soft sum

Method 1Method 2

Method 1Method 2

Module N2 Module P2

Bzero Run Set

• Run Numbers 16361 – 16279• Taken from 1/14/05 to 1/16/05• Number of events ~ 21M• Trigger configurations

– CuCuMinimumBias (80%)

– PdlWideOpen (14%)

– T0NarrowOpen (6%)

BZero Runs Trigger Check

1. TCut PdlTDiff = "abs(PdlTDiff+0.77)<5";

2. TCut ZDC = "TrgT.ZDCSumP>420&&TrgT.ZDCSumN>420&&(TrgT.ZDCSumP+TrgT.ZDCSumN)<1110

3. TCut PdlSum = "PdlP>400&&PdlN>300";

4. TCut HB = "(L1&0x0100)==0";

5. TCut IsCol = PdlTDiff&&HB&&(ZDC||PdlSum);

6. TCut GoodL0 = "(L0&0x0f00)==0";

7. TCut GoodT0Time = "TrgT.Extra[19]>0&&TrgT.Extra[20]>0";

8. TCut NarrowT0Time = "abs(TrgT.Extra[19]-TrgT.Extra[20]+9.83)<30";

9. TCut CleanOctVtx = "abs(15.*(TrgT.Extra[19]-TrgT.Extra[20]+9.83)-OctagonVertex.vz)<30";

10. TCut CleanNewOctVtx = "abs(15.*(TrgT.Extra[19]-TrgT.Extra[20]+9.83)-NewOctagonVertex.vz)<30";

11. TCut CleanOctDeVtx = "abs(15.*(TrgT.Extra[19]-TrgT.Extra[20]+9.83)-OctDeVertex.vz)<30";

12. TCut CleanCorOctDeVtx = "abs(15.*(TrgT.Extra[19]-TrgT.Extra[20]+9.83)-CorOctDeVertex.vz)<30";

13. TCut CleanT0Time = GoodT0Time&&"abs(TrgT.Extra[19]-TrgT.Extra[20]+9.83)<2.6";

14. TCut CleanT0_19 = "abs(TrgT.Extra[19]-297.49)<2.5";

15. TCut OffloT0_19 = "abs(TrgT.Extra[19]-292.49)<2.5";

16. TCut OffhiT0_19 = "abs(TrgT.Extra[19]-302.49)<2.5";

17. TCut CleanT0_20 = "abs(TrgT.Extra[20]-307.25)<2.5";

Percent of number of events with good L0

Percent of number of events with good L1

Paddles gain stability

Percent of time calibrator events

Paddle Mean

ZDCs

T0 time difference

Tcut