1. First Look at Housekeeping Data
The goal
Demonstrate the ability to correlate housekeeping data with “science” data
Generate a list of distributions to be monitored for the LAT tests during I&T
Improve and tailor the system to match ISOC needs
Today’s Test
Correlate hit multiplicity in a layer with temperature from CAL and TKR sensors
The method
Verify that temperature values agree with expectation
Correlate temperature with layers in the TKR

2. Location of TKR sensors
There are 2 sensors attached to each of the 8 TKR cables
In the diagram above we only highlighted 8 of the 16 sensors

3. Location of temperature sensor in TKR

4. Location of CAL sensors
Thermistor

5. What do we expect for 2 towers?
Grid temperature is close to that of CAL OK
Bottom sensor of TKR could be a few degrees above the grid temperature
Top sensor of TKR should be at a higher temperature than bottom sensor
Oops, this is not what we see.
See next slides
TKR top
sensors
TKR bottom
sensors
CAL sensor

6. CAL temperature for Towers 0 and 4
Sensor 0 is not used
Sensor 0 is not used
Time
Time
Temperature
Temperature
Sensor 1 only
Sensor 1 only
Temperature is uniform within 0.50C
Time
Time

7. TKR temperature for Towers 0 and 4
Temperature is uniform within 0.50C
Time
Time
Temperature
Temperature
Puzzle: Top sensor temperature is systematically higher than that of the lower sensor
Time
Time

8. What’s up with the discrepancy?
There are three reasons why the TKR top could be at lower temperature than TKR bottom?
Error in data analysis code that plots the distributions
Xin already checked this is not the case
Variations as function of time
Error in mapping the thermistor when reading it out and before loading into the database
Error in loading the values in the ISOC database
Jim Panetta is checked that this is not the case
Expectations based on current configuration are actually wrong
Will ask Martin Nordby about that
Could be an issue in converting values in the TEM
Will ask Mike/Leonid about it

9. Monitor Peak Temperature
TKR Cable Number
Tower 4 3 2 1 4 Y 5 6 7 X
Tower 0 3 2
Expect these 4 values to be higher
than the other ones 4 1 5 6 7
These should be monitored as we assemble more towers

10. Science Data vs. Housekeeping Data
From Xin…
Temperature
Hit multiplicity
Temperature
Hit multiplicity
Tower 0, bottom layer
Tower 0, top layer
Time
Time
Temperature
Temperature
Hit multiplicity
Hit multiplicity
Tower 4, bottom layer
Tower 4, top layer
Time
Time