First Look at Housekeeping Data

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 IT
• Improve and tailor the system to match ISOC needs
• Todays 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
Sensor 1
Sensor 0
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
• OK
• 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
Temperature
Temperature
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
Temperature
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
Whats 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
• Xin already checked this is not the case
• 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
2
3
1
4
Y
0
5
7
6
X
Tower 0
3
2
Expect these 4 values to be higher than the
other ones
1
4
0
5
7
6
These should be monitored as we assemble more
towers
10
Science Data vs. Housekeeping Data
From Xin
Temperature
Temperature
Hit multiplicity
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