Washington Temperature sensors.

I.  Cabling

There are UW 20 temperature sensors installed on all EML and EMS (except EMS1), and EIL4 chambers.

There are 5 "strings" of temperature sensors (TS).  Each string consists of 2 small printed circuit boards (PCB) connected in series by 2 RJ45 cables to the DCS box on the readout end of the chamber. The cables plug into a triangular adapter board which is plugged into "tsensor" connector on the DCS box.

Each PCB has a pair of short cables with a TS on the end for a total of 20 TS's in the 5 strings per chamber.  The strings are numbered and color coded as follows (color code is on the cable connector cover, not the cable itself):

String1: grey
String2: yellow
String3: green
String4: blue
String5: red

The 2 PCB are labeled N-1and N-2, where N is the string number.  The PCB pairs in the string have an ID number [1..1000] written for reference to calibration constants.  The 5 sets of strings in a chamber set usually have contiguous numbers (e.g. 221-225) The lowest numbered string is (usually) installed as string 1, the 2nd
string 2, etc.  The 1st PCB in a string has 2 RJ45 jacks, and the 2nd board 1 jack.  On the PCB with 2 RJ45 jacks the cable from the DCS should be installed to the jack on the same side as the 2 short TS cables.  The other jack is cabled to the 2nd PCB.  The TS are glued at the ¼ points along the beams.  On the end and center crossbeams the
sensors are inserted in the gap between tube and crossbeam.  On the longbeams the sensors are glued on top and bottom of the beam.  The sensors on the end crossbeams are put 1 tube away from the ¼ point where there is more room to insert the sensor.  The 2 (short) TS cables on each PCB have slightly different lengths.  The shorter TS cable goes to upper ML (defined at the ML with PMO fixtures), and the
long cable to the lower ML.  Sensors should be glued oriented towards the chamber center.

Figure 1. Cabling diagram for UW T sensors.
Cabling diagram for Washington T sensors



  Table 1.  Locations of temperature sensors by string and channel number.
 String Channel Location "L" chamber Location "S" chamber Description
String1-1 short 0 1 2 RO crossplate short side
String1-1 long 1 2 1 RO crossplate short side
String1-2 short 2 13 14 Short longbeam near RO side
String1-2 long 3 14 13 Short longbeam near RO side
String2-1 short 4 3 4 RO crossplate long side
String2-1 long 5 4 3 RO crossplate long side
String2-2 short 6 19 20 Long longbeam near RO side
String2-2 long 7 20 19 Long longbeam near RO side
String3-1 short 8 11 12 Center crossplate short side
String3-1 long 9 12 11 Center crossplate short side
String3-2 short 10 9 10 Short longbeam near HV side
String3-2 long 11 10 9 Short longbeam near HV side
String4-1 short 12 17 18 Center crossplate long side
String4-1 long 13 18 17 Center crossplate long side
String4-2 short 14 15 16 Long longbeam near HV side
String4-2 long 15 16 15 Long longbeam near HV side
String5-1 short 16 5 6 HV crossplate short side
String5-1 long 17 6 5 HV crossplate short side
String5-2 short 18 7 8  HV crossplate long side
String5-2 long 19 8 7  HV crossplate long side


(This is the normal case - if short/long cables are glued on wrong ML, or if strings are plugged into the wrong socket, there are exceptions to this mapping.).

II.  Database files.   Here is the format of DB files created for the Phase I chamber commissioning.  The files are located at /afs/atlas.umich.edu/CHData/tsensor.

Sample DB file.

Name: tsensor_2005_03_21_15_31_56_eml1c15.txt:

C Tsensor 03/21/05 15:31:56
C Operator: Reid Smith
C Chamber: EML1C15
String1-1 T1 Socket1 789 1
String1-1 T2 Socket1 789 2
String1-2 T3 Socket1 789 3
String1-2 T4 Socket1 789 4
String2-1 T1 Socket2 790 1
String2-1 T2 Socket2 790 2
String2-2 T3 Socket2 790 3
String2-2 T4 Socket2 790 4
String3-1 T1 Socket3 791 1
String3-1 T2 Socket3 791 2
String3-2 T3 Socket3 791 3
String3-2 T4 Socket3 791 4
String4-1 T1 Socket4 792 1
String4-1 T2 Socket4 792 2
String4-2 T3 Socket4 792 3
String4-2 T4 Socket4 792 4
String5-1 T1 Socket5 793 1
String5-1 T2 Socket5 793 2
String5-2 T3 Socket5 793 3
String5-2 T4 Socket5 793 4

The general format is:

StringX-Y TN SocketM ID W F

StringX-Y => X = "string" number [1:5]
             Y = "board" number  [1:2]
TN        => N = temperature sensor on string [1:4]
             Board 1-1 short cable = T1
             Board 1-1 long cable  = T2
             Board 1-2 short cable = T3
             Board 1-2 long cable  = T4

SocketM   => M = electronics socket on DCS box [1:5]
             This is converted to a readout channel number [0-19]
             as follows:
             channel = (X-1)*4 + N - 1

ID        => sensor ID number [1:1000] - this is the number written on
             the PCB board
W         => This is the number of the sensor within the string.  Note
             that there are 4 temperature sensors with the same ID
             number, which are distinguished by W.  In a few cases,
             strings were split up, so the PCB1 and PCB2 had different
             ID numbers.   The W numbers follow the pattern:
               PCB1 short cable = 1
               PCB1 long  cable = 2
               PCB2 short cable = 3
               PCB2 long  cable = 4
             In order to give each sensor a unique ID number in the DB
             a new DB_ID number was constructed out of ID and W:
             DB_ID = 10*ID + W

F         => This is an optional flag which is a character strings.
             Allowed options:
             [Rr] => short and long cables from a PCB were glued on
             the wrong MLs (normally short goes on the "upper"
             (PMO-side) ML, and long on the "lower" ML).  This flag
             must occur in pairs, obviously.
             [Gg] => The temperature sensor ground line was
             disconnected because it was found to be connected to the
             chamber ground (which would cause ground loops).
             [Dd] => sensor is disconnected or non-functional.

Table 1. gives the correspondence between the readout channel and the physical location of the sensor.