TRD Instructions For Fall 2015 Run

From GlueXWiki
Jump to: navigation, search
... and NOT ONLY for the 2015 run ...

Before adjusting voltages

  1. To check or set HV/LV, first ssh into a gluon machine (like gluon30 or gluon29). For example:
    • ssh hallgw
    • ssh hdfdcops@gluon30

Adjusting the HV

  1. Before using telnet, ensure that nobody else is connected to the crate (using 2 telnets to the same crate will cause problems)
  2. Telnet in with: telnet u2-10-top 1527
    • Login with the username: 'user' and the appropriate password.
    • The TRD is using the first 8 channels of slot 15 (or channel#'s: 15.0000-15.0007 in the right column), which is the very bottom set of channels.
  3. To change one of the voltages (or other options), simply navigate to the appropriate channels with the arrow keys, type the desired voltage, and use the down or up arrows to enter the voltage.
  4. After finishing, make sure to log out (use 'tab' to access the top menu and 'enter' to select options).


Adjusting the LV

To check the low voltage status, use the web:

  1. On a gluon machine: "firefox --noremote" then go to "u2-9-mid"
    • The TRD uses U204, U205, and U206. U207 is also connected but is not being used for the fall 2015 run.

Important: starting 2021, use "halldmpod16", instead of "u2-9-mid", as we started using a new mini-MPOD.There you should look at channels 300-307.

To set the LV (or any related parameters), use the appropriate set of the following commands:

  1. To set the target output Voltage:
    • snmpset -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputVoltage.u204 F 6.65
    • snmpset -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputVoltage.u205 F 6.65
    • snmpset -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputVoltage.u206 F 6.65
  2. To turn on channels:
    • snmpset -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputSwitch.u204 i 1
    • snmpset -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputSwitch.u205 i 1
    • snmpset -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputSwitch.u206 i 1
  3. To turn off channels:
    • snmpset -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputSwitch.u204 i 0
    • snmpset -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputSwitch.u205 i 0
    • snmpset -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputSwitch.u206 i 0
  4. To get the sense voltage:
    • snmpget -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputMeasurementSenseVoltage.u204
    • snmpget -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputMeasurementSenseVoltage.u205
    • snmpget -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputMeasurementSenseVoltage.u206
  5. To get the current:
    • snmpget -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputMeasurementCurrent.u204
    • snmpget -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputMeasurementCurrent.u205
    • snmpget -v 2c -m +WIENER-CRATE-MIB -c guru u2-9-mid outputMeasurementCurrent.u206

Gas Pressure

Gas pressure can be monitored by looking at the EPICS variable RESET:i:TRD_Pressure_R, using MyaViewer.

Data readout

Eight pre-amps (cell 1/2, wires 1/2, cathodes 1/2) are connected to three fADC125 modules at the left side of the Start Counter VME crate "rocst":

    • slot 13 ch0-71 cell1_wires1, cell1_wires2, cell1_cathodes1
    • slot 14 ch0-71 cell2_wires1, cell2_wires2, cell2_cathodes1
    • slot 15 ch0-47 cell1_cathodes2, cell2_cathodes2

Numbering of the pre-amps looking downstream from right to left on both cells: wires1 then wires2, cathodes1 then cathodes2.

The fADCs use frequency of 125/4 = 31.25MHz, or 32 ns sample. The window will be set to about 300 samples or 9.6 usec. In addition to the trigger delay of about 3 usec, there's fixed delay in the fADCs of 7 usec to accommodate for the long window.

DAQ runs with "TRD" selection at the top.

Analyzing data

The analysis software is at hdfdcops@gluonXXX in:

/gluonfs1/home/hdfdcops/code/ADCtests/readout/TRD/

The source is DAQCrateAnalyzer.cc, and the executable DAQCrateAnalyzer (produced by make). To analyze a run:

./DAQCrateAnalyzer <run_file_name>

Make sure you have set the correct run file directory in DataDir variable at about line 140 in the source. The number of events to analyze is given by NEVENT (line ~326 in the code).

Run conditions

Nominal HV: all poitive should be set at 1700V, all negative to 0V. During the run if there's time one can try 1750V and 1650V.

TRD should be read out whenever there's trigger from the PS. In the "standard" beam, radiator, converter configuration (100nA, 10^-4 radiator, and middle thickness converter) the trigger rate should no exceed 1kHz. Running at lower intensity is beneficial for the TRD test.

Older TRD run plans

Plan for the Fall 2015 run in this pdf, which includes the various radiator configurations which will be tested.