ALICE Calibration Requirements

TOF OK July 06

Par #

Parameter

Data format/size per channel

Data size (Total) Bytes

Update freq

Source

Confirmed

Run type / Trigger type

# of required events/sampling rate

Processing level: sub-event or event

Results: FEE/Archive

Accessible by offline

Calib. Procedure in AliRoot

use case #

on FES

in OCDB

reference

1

Offline (refined) Calibration

6 floats

3.84E+06

Month

Physics data - ESDs

Yes

Physics Events

1e7-1e8 pp events

event

Offline/OCDB

Yes

Yes

-

2

Rough TDC channel equalization

1  short int

3.20E+05

Run

DAQ (Online Calibration)

Yes

Physics Events

1e6-1e7 pp events

event

DAQ FES/OCDB

Yes

Yes

1

3

TDC channel’s operating status

1 char

1.60E+05

Run

DCS (from pulser data taken outside physics runs and DCS Config  DB)

Yes

monitor runs

Run

-

DCS FES/OCDB

Yes

Yes

4

4

HV (Voltage)

O(10floats)+1 short int

7.60E+03

Run

DCS Archive DB

Yes

-

minute

-

DCS ArchiveDB/OCDB

Yes

-

4

5

HV (Current)

O(10floats)+1 short int

7.60E+03

Run

DCS Archive DB

Yes

-

minute

-

DCS ArchiveDB/OCDB

Yes

-

4

6

LV channels (Voltage)

O(10floats)+1 short int

3.33E+04

Run

DCS Archive DB

Yes

-

minute

-

DCS ArchiveDB/OCDB

Yes

-

4

7

LV channels (Current)

O(10floats)+1 short int

3.33E+04

Run

DCS Archive DB

Yes

-

minute

-

DCS ArchiveDB/OCDB

Yes

-

4

8

FEE Thresholds

O(10floats)+1 short int

4.84E+04

Run

DCS Archive DB

Yes

-

minute

-

DCS ArchiveDB/OCDB

Yes

-

4

9

FEE Temperatures

O(10floats)+1 short int

3.27E+05

Run

DCS Archive DB

Yes

-

minute

-

DCS ArchiveDB/OCDB

Yes

-

4

10

Temperature (Env.)

3 floats (2-par fit+max excursion)

12

Run

DCS Archive DB

Yes

-

minute

-

DCS ArchiveDB/OCDB

Yes

-

4

11

Atmospheric Pressure

3 floats(2-par fit+max excursion)

12

Run

DCS Archive DB

Yes

-

minute

-

DCS ArchiveDB/OCDB

Yes

-

4

7E6-11E6

4.78E+06

0.00E+00

Comments:

Parameter 1,2,3 only are needed in a fit approximation for calibration. The other parameters will be kept for offline monitoring and could eventually be used for calibration

Item 2:  We would like to have the data used to calculate the delays (root file containing 160K histograms, size is about 60MB) to be optionally archived as "reference data".

Item 3:  status word for each TOF TDC channel. In particular, the map of  dead channel  from pulser data  is needed . This info is not monitored in the DCS Archive but saved in our "local" DCS,  and the                                                                                                                mechanism to make it accessible to the SHUTTLE has to be defined . Moreover, we would like to keep track of channels being switched off in the read-out (because noisy, for ex.) This info is stored in the DCS config DB,  which is not accessible by t he shuttle as well .

Items 4-8: Here we foresee to store a maximum of 5 couples of floats  (Value of the monitored quantity,Timestamp) corresponding  to changes of the monitored parameter by a significant amount during the run.