Status of r eceivers related activities

1

Status of Status of receivers related activitiesreceivers related activities

Damien PrieurDamien PrieurUniversity of Pittsburgh

12/01/2010 L1Calo Joint Meeting - Heidelberg

12/01/2010 L1Calo Joint Meeting - Heidelberg2

Receivers SoftwareReceivers Software

Overhaul of L1GainDb & UsbController packages Improved USB communication Database access implemented

Larg_L1MON_A & Larg_L1MON_C segments enabled Right on time before beam ! Thanks to Murrough L., Fatih B. & Henric W. Have to be moved out of the LArg segment (Tile/L1Calo calibration runs)


Rx Gains - Online Software

Receivers Strategy Defines the set of receiver gains to be loaded Selection through dropdown list in L1Calo panel Must be set before CONFIG step !

Controller communication issues Few USB communication errors observed ~1% Not critical, have to re-config the concerned

segment


Rx Gains – Database Structure

Oracle INTR server Store conditions before start of run Strategy, final gains, DACs & status

Factor folders 8192 channels/factors per folder

Define Strategies One strategy = set of factor folders Selected on L1Calo panel Gains from different folders are factorized (per channel)


EETT Calibration Calibration


ET Calibration

LArg/L1Calo energy scans Match L1Calo to LArg offline energy

Use calibration OFCs Corrections for high voltage, dead channels Correction for disabled FEBs, dead OTX

HAD

Gains produced in time for beam Thanks to Veit Scharf & Antoine Marzin EMB, EMEC, HEC, Tile

EM

1.3

1

0.7

1.5

1

0.4


No calibration for FCAL yet Technical issues to reconstruct LArg energy

Problematic towers Few towers with non-optimal calibration Sick TBB

EMB/EMEC overlap region All trigger cable installed Have to determine correct length

ET Calibration

HAD

EM


Splashes

Correlation plot from Huaqiao Zhang

3% bias for EMB and EMEC To be investigated

TBB delays not appropriate Set to calibration instead of physics Few % deviation


B/EC Overlap RegionB/EC Overlap Region


Overlap cabling

Barrel Receiver

EMEC Receiver

EM

B

Ove

rlap

‘octopus’ cable37-pin to 4 x 9-pin connectors

EMEC Overlap

VGA

VGA

+

‘E’ connector

EMB & EMEC overlap channels summed at the receivers level


‘E’ connectors

EM

B

Cra

teEM

EC

Cra

te

Breakout boxBill ClelandPittsburgh

4 x 4-pair cables

1 x 16-pair cable

Overlap cabling

All cables installed Cables prod. &

inst.Michel MathieuAndrei Akimov

EMB EMEC

0 1

0 1

0 1

0 1

1 0

1 0

1 0

1 0

0

1

2

3

4

5

6

7

pa

irA-Side

12/01/201012

L1Calo Joint Meeting - Heidelberg

Overlap timing from beam-splash events

Octopus cables 5S & 1S were in place

Set receiver gains to alternate the EMB/EMEC signal components vs phi

connector

2 0

A-SideC-Side

EMEC

EMBEMEC

EMB

phi

13

TT to TT timing raisonnable for EMB

Unexpected offset between EMB & EMEC…

50 ns 63 ns

Overlap timing from beam-splash events

Cables longer than nominal values

To be on the safe side ~10-15 ns

Non nominal TBB delays ~3-6 ns

Bug in length calculations ~20 ns

Still 15-20 ns to be understood PS rise time ≠ energy fraction

[bc] [bc]

EMECEMB

EMECEMB

12/01/2010 L1Calo Joint Meeting - Heidelberg


Calibration delays set until first collisions Determined from single-layer phos4 runs

Then moved to physics delays Based on calibration delays + LAr tool to get physics/calib. time difference

Tower Builder Boards delays

Back layer is the culprit

Most probably bug in calibration cable length used to compute phys/calib difference

eta=0.15 (0x00140500): 6 7 7 6 eta=0.05 (0x00100c01): 0 0 0 7

Ps Fr Md Bk

Central towers not timed

Caused by physics delays


TBB delays database, Paolo working on

it

Understand physics delays at eta=0

Barrel/End Cap overlap region Have to accumulate data to check/compute timing Understand discrepancies wrt computed values

Ongoing work

Documents

Status of r eceivers related activities