1. VELO Software Update TELL1 Algorithms Error analysis
Bit-perfectness
Beetle header correction
Error analysis
Occupancy/Noise analysis
Gain Calibration
Parameter Storage
TELL1 clustering in simulation
Pile-up

2. TELL1 Algorithms
Tomasz, Guido
+ Karol, Kurt, Alex…
In June TED run significant discrepancy seen between emulation and TELL1
TELL1 producing significant extra ‘noise’ clusters
TELL1 C lib and firmware 4.0 recompiled and installed
Test data with various algorithm configurations & databases taken.
Major problem solved
Some discrepancies still under investigation on boundary strips in FPGA processing, working with Alex Gong
Currently 96.7% bit perfect

3. Beetle Header Cross-talk
Tomasz Szumlak
Cross-talk in first channel of each data link from header bit on Beetle chip
Correction algorithm in TELL1
Significant for ACDC3, Small effect in final system now correct timing & link compensation
Prob. turn-off correction for 2009, but monitor
Cross-talk
In data
ACDC 3 Data
Before correction
After correction
Channel from
same link
Draft LHCb note circulated for comments

4. Error Monitoring TELL1 Error monitoring developed
Chiara Farrinelli
TELL1 Error monitoring developed
Main purpose - identifies synchronisation errors
Beetle pipeline column number decoded based on headers and compared with reference Beetle on TELL1
Plots added to standard monitoring
Tuning procedure for header high/low states and hgh rate tests planned

5. Occupancy & Noisy Strips
James Keaveney
(+ Sara, Kurt, CP)
Procedure to monitor & mask out any noisy strips or links
1. Occupancy
Clustering algorithm strip inclusion thresholds are set based on noise in strips
Occupancy monitoring developed
Strips appearing in clusters above an occupancy threshold (currently 1%) in noise data can be masked out in TELL1
2. Noisy/ Dead Strip identification
Strips with higher noise identified
Dead strips identified using noise data with no voltage applied to detector – this makes them more obvious
monitoring of both classes put in place

6. Gain Calibration Before Cross-checked with testpulses
Grant McGregor
Before
Gains in velo system calibrated using Beetle headers
Cross-checked with testpulses
Now looking at dE/dx

7. Gain Calibration After Cross-checked with testpulses
Grant McGregor
After
Gains in velo system calibrated using Beetle headers
Cross-checked with testpulses
Now looking at dE/dx

8. Parameter Database (with ST)
Identified need for
Storage of calibration parameters used in data taking
e.g. pedestals, thresholds, timing parameters…
Plan to automatically store at end of run in XML file
Storage of parameters for uploading/monitoring
Calculated parameters from analyses (pedestals…) that will be uploaded
Parameters needed for system monitoring (e.g. dead, noisy strips)

9. TELL1 Clustering in Boole
Tomasz Szumlak
Implementation of final VELO clustering in Boole
99.9% works, timing OK
BUT problem with 4-strip clusters (in TELL1?) causes crashes in associators
Was aiming for release last month, dealyed due to TELL1 bit-perfectness issue
Old clustering
TELL1 Clustering

10. Pile-up Decoding added for digital data
Serena Ogeero working on pile-up software
Velo-ers happy to support when can
Decoding added for digital data
Material description of pile-up carbon fibre supports
Work started on including pile-up analogue data in Vetra emulation
Serena
Mark & Tom
Tomasz

11. Summary Other topics not covered here Critical path for data readiness
Vetra v7r2 released (Tomasz)
Monitoring Improvements (Eduardo, Kurt)
Closing improvements (Malcolm, Sophie, Marco)
Delta-rays (first work from James, David)
Preparation of CCE analysis, PVSS panel for data taking (Stefano)
Critical path for data readiness
Bit-perfectness
Complete error monitoring
Databases
Critical Item on Simulation
TELL1 Clustering in Boole
Getting ready for TED run next week
Thanks to Kurt for giving this,
apologies as have teaching - Chris