1. L1Calo Joint Meeting Introduction
A great time to be in a great place
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

2. L1Calo Joint Meeting 11th-13th January 2010
Great Times
LHC is finally delivering beam
We can confidently expect a lot more this year
L1Calo is working well
Always room for improvement
Will become vital to ATLAS operation in 2010
We have a short break to regroup
Timing of meeting couldn’t have been better!
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

3. L1Calo Joint Meeting 11th-13th January 2010
Great Place
Need I say more…
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

4. L1Calo basics reminder Quick guide to trigger item terminology
EM = e/gamma trigger – pure EM threshold
J = jet trigger – usually 0.8x0.8 in both layers
FJ = forward jet – jet located in FCAL
TAU (or HA) = tau trigger – narrow sum in both layers
XE = missing energy
TE = total energy
JE = jet sum energy
This is the ‘service’ we
provide to ATLAS, and
what people will notice
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

5. L1Calo Joint Meeting 11th-13th January 2010
L1Calo working well?
That’s what the majority of this meeting will be about
However, a quick sneak preview
Trigger rates during beam collisions
Single event analysis
It’s the only type I can do
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

6. Expected trigger rates
Rate estimates shown in trigger menu meeting
I believe XE10 rate is wrong
Luminosities achieved in 2009 actually more like n x 1026
Where n is not large!
L1Calo rate around 0.01 Hz
Lowest threshold cosmic rate is about 5 Hz
But for beam require beam-pickup coincidence
Cosmic rate ~0.002 Hz per filled bunch
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

7. L1Calo Joint Meeting 11th-13th January 2010
Trigger rates in run
Stream rates per lumi-block are quite useful
Luminosity in falls from 2.5 to 1 x 1026 during this fill
Luminosity dependence in L1Calo stream hardly striking
But it is there!
Note that cosmic rate would be around 0.01
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

8. L1Calo and L1CaloEM purity
Same run, L1Calo and L1CaloEM stream
L1CaloEM cosmic rate would be ~0.001 Hz
High overlap with MBTS_1_1 ‘golden’ trigger
L1Calo ~60%, L1CaloEM ~90%
OK, there aren’t many L1Calo events, but they’re good quality triggers!
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

9. L1Calo Joint Meeting 11th-13th January 2010
Single Event Analysis
Here’s the event:
Credits to Jürgen Thomas
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

10. L1Calo Joint Meeting 11th-13th January 2010
Why this event?
Large energy, spread over several towers
What really impressed me
Background
We only trigger on bunch-crossing that coincides with beam pick-up
That is if we get timing 1 BC out, we miss the event
This means getting the right bunch-crossing (signal timing) is vital
However, we read out data before and after triggered BC
So what did we see before and after this event? BC
Non-zero towers
Sum Et
Missing Et -2 -1 1 22 59 5 +1 +2
Note: typical random events contain 0, 1 or 2 towers with 1 GeV
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

11. Distribution of energies
15 EM towers with 48 GeV total
7 Hadronic towers with 11 GeV total
Probably only 1 non-zero tower with wrong BCID
And we only expect 50% BCID efficiency for 1 GeV signals
Even with perfect timing!
Thresholds fired:
2EM3, 2EM4, EM5, EM10, 3HA5, 2HA6, 2HA8, HA11, 2J5, 2J10, 2J15
EM tower energies
Hadronic tower energies
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

12. L1Calo Joint Meeting 11th-13th January 2010
Pulse shape analysis...
...by eye
9 GeV LArg
4 GeV Tile
2 GeV LArg
2 GeV Tile
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

13. L1Calo Joint Meeting 11th-13th January 2010
L1Calo is on the move
Test lab moving 3150 to 104
Probably start of February
L1Calo offices moving 54 to 104
Birmingham, Heidelberg, RAL
Plus a sneaky QMUL member
Probably similar time-scale
Test Lab area
New Offices
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

14. L1Calo Joint Meeting 11th-13th January 2010
Meeting Structure
Monday
AM: System Status/Development
PM: Upgrade
Tuesday
AM: First Data Analysis
PM: Calibration
Management Meeting
Group Meal
Wednesday
Organisation, Interactions and Wrap-Up
Note to speakers:
Make sure work background is clear
Try to avoid L1Calo jargon
All sessions in this room (and on EVO)
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010

15. Initial Words from our Hosts?
Meeting Structure
Monday
AM: System Status/Development
PM: Upgrade
Tuesday
AM: First Data Analysis
PM: Calibration
Management Meeting
Group Meal
Wednesday
Organisation, Interactions and Wrap-Up
Note to speakers:
Make sure work background is clear
Try to avoid L1Calo jargon
Initial Words from our Hosts?
All sessions in this room (and on EVO)
11/01/2010
L1Calo Joint Meeting 11th-13th January 2010