Cleo iii trigger systematic studies progress report m selen
This presentation is the property of its rightful owner.
Sponsored Links
1 / 16

CLEO-III Trigger Systematic Studies Progress Report – M. Selen PowerPoint PPT Presentation


  • 82 Views
  • Uploaded on
  • Presentation posted in: General

CLEO-III Trigger Systematic Studies Progress Report – M. Selen. Axial Tracking Study more or less completed Work done by Inga Karliner (build on work by Randal Hans) Bottom line: Efficiency for PT>200 MeV ~ 99.9% Stereo Tracking A natural extension of the above

Download Presentation

CLEO-III Trigger Systematic Studies Progress Report – M. Selen

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Cleo iii trigger systematic studies progress report m selen

CLEO-III TriggerSystematic StudiesProgress Report – M. Selen

  • Axial Tracking

    • Study more or less completed

    • Work done by Inga Karliner (build on work by Randal Hans)

    • Bottom line: Efficiency for PT>200 MeV ~ 99.9%

  • Stereo Tracking

    • A natural extension of the above

    • Studies done by Charles & Randal have shown this is also extremely efficient. We will quantify this soon.

  • Calorimeter

    • Work proceeding in || with CLEO-c sharing (show some plots).

    • Studies done by Topher Cawlfield (build on work by Jesse Ernst)

  • Timing

    • This was “tuned” when the trigger was commissioned.

    • Will quantify after calorimeter turn-on study.


Cleo iii trigger systematic studies progress report m selen

Mixer/Shaper Crates (24)

Drift Chamber Crates

Gates

CLEO

Mixer/Shaper

Boards

ctrl.

DR3 - TQT

G / CAL

TILE (16)

AXTR(16)

AXX(16)

Flow control & Gating

DFC

DAQ

ASUM

Analog

TIM

TIM

Barrel CC

Axial tracker

QVME

DM/CTL

DM/CTL

TILE(8)

STTR(12)

L1D

ASUM

Stereo tracker

Endcap CC

QVME

TIM

DM/CTL

Level 1 decision

AXPR

TRCR

CCGL

TRCR

CC Digital

TPRO(4)

TIM

SURF

SURF

TPRO(2)

DM/CTL

TCTL

TIM

DM/CTL

CLEO-III/cTriggerSystemOverview


Cleo iii trigger systematic studies progress report m selen

Layer 9 = “key”

InnerLookup

OuterLookup

Inner/Outer track correlator


Tracking systematic study

“Hadron”

“Electron”

Tracking Systematic Study

  • Approach:

    • Look at CLEO-III Data-5 through Data-16

    • Select events that pass EL-track line

      • (#AX>0)&(#CBmd>0)&(AX+CB time)

    • Select by L3 classification

    • Loop over “good” reconstructed tracks (c2/dof<3.5, d0<1.5cm, etc…)

      • Ignore highest momentum track (assume it caused trigger)

      • Examine trigger status of all other tracks (did it “pass” or not)


Cleo iii trigger systematic studies progress report m selen

  • To see if a track “passes” trigger:

    • Extrapolate fit back to layer 9 to see which of the 112 key wires should be asserted.

    • See if the track-finding hardware for this wire, or either of its immediate neighbors, reports a correlated track.

    • A track is called “Isolated” if there are no other tracks within ±5 key wires.

    • If trigger does not fire,see if its because of:

      • Missing hits (OK)

      • Hardware (BAD)

    • Study as a function oftracks PT and cos(q)


Cleo iii trigger systematic studies progress report m selen

No Trigger

- hardware

“Isolated

Tracks”

In

Electron

Events

All Tracks

PT

1/PT

1/PT

No Trigger

-missing hits

200 MeV

Total Efficiency

1/PT

1/PT


Cleo iii trigger systematic studies progress report m selen

No Trigger

- hardware

All Tracks

“Isolated

Tracks”

In

Hadron

Events

PT

1/PT

1/PT

No Trigger

-missing hits

200 MeV

Total Efficiency

1/PT

1/PT


Cleo iii trigger systematic studies progress report m selen

No Trigger

- hardware

All Tracks

“Non-Isolated

Tracks”

In

Hadron

Events

PT

1/PT

1/PT

No Trigger

-missing hits

200 MeV

Total Efficiency

1/PT

1/PT


Cleo iii trigger systematic studies progress report m selen

cos(q)

cos(q)

cos(q)

cos(q)

No Trigger

- hardware

All Tracks

“Isolated

Tracks”

In

Electron

Events

Cos(q)(PT > 200 MeV)

No Trigger

-missing hits

Total Efficiency


Cleo iii trigger systematic studies progress report m selen

cos(q)

cos(q)

cos(q)

cos(q)

No Trigger

- hardware

“Isolated

Tracks”

In

Hadron

Events

All Tracks

Cos(q)(PT > 200 MeV)

No Trigger

-missing hits

Total Efficiency


Cleo iii trigger systematic studies progress report m selen

cos(q)

cos(q)

cos(q)

cos(q)

No Trigger

- hardware

“Non-Isolated

Tracks”

In

Hadron

Events

All Tracks

Cos(q)(PT > 200 MeV)

No Trigger

-missing hits

Total Efficiency


Axial tracking summary

Axial Tracking Summary:

  • For PT > 200 MeV we lose the following due to missing hits:

    • 1 of 41,500 isolated electron tracks

    • 13 of 10,500 isolated hadron tracks

    • 1 of 4,100 non-isolated hadron tracks

  • Overall efficiency > 99.9%

  • We don’t lose any tracks due to “missing hardware”.


Cleo iii trigger systematic studies progress report m selen

Axial

Raw key wires

112

Clustered key wires

112

Axial matching cells

48

Stereo - U

48 high

48 low

Stereo - V

48 high

48 low

high

low

high

Stereo Tracking


Cleo iii trigger systematic studies progress report m selen

1.0

Needtostudy

.8

.6

.4

.2

Topher’s study of CC “turnon” behavior


Cleo iii trigger systematic studies progress report m selen

CC time – TR time

LOW

Time Bucket

5

20

10

15

10

20

MED

30

40

Key Wire

50

60

HIGH

70

80

90

100

110

#track

Ev-time

Timing Issues


Summary plan

Summary & Plan

  • Axial Tracking Trigger studies more or less finished

    • Efficiency >= 99.9% for PT > 200 MeV

  • Stereo Tracking study is next

    • Expect similar results

  • Calorimeter studies also under way

    • Understand turn-on behavior for each TIXEL

      • Threshold, Width, Max-efficiency

      • Also needed for MC

    • Must include sharing. This is non-trivial.

  • Timing is an issue that still needs to be addressed

    • TR relative to CC

    • Overall efficiency


  • Login