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Performance Tests and Control for the TRD-HV A. Markouizos, A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou Athens University. ALICE DCS Workshop CERN March 2006. Requirements of the TRD-HVDS. A Master/Slave HV distribution system will deliver the

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ALICE DCS Workshop CERN March 2006

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Alice dcs workshop cern march 2006

Performance Tests and Control for the TRD-HVA. Markouizos, A. Petridis, S. Potirakis, M. Tsilis, M. VassiliouAthens University

ALICE DCS Workshop CERN March 2006


Alice dcs workshop cern march 2006

Requirements of the TRD-HVDS

A Master/Slave HV distribution system will deliver the

required voltages to the TRD readout chambers:

Drift HV:

540 ch. ~ -2.5 kV 170μA/ch (max) ΔI ~ 40nA/ch

Anode HV:

540 ch. ~ +1.7 kV 7 μΑ/ch (max) ΔI ~ 2nA/ch


Stability test in the lab with resistor loads 36 hours of operation for 6 channels

Stability test in the Lab with resistor loads 36 hours of operation for 6 channels


Dn dv distributions for the last 4 hours after 72 hours of operation

dN/dV distributions for the last 4 hours after 72 hours of operation


Alice dcs workshop cern march 2006

Perfomance test in Heildeberg

HV card connected with TRD stack

(18 hours of operation)

Voltage in ADC units vs Time

Reference channel with 500Mohm


Alice dcs workshop cern march 2006

  • Embedded Software Status:

  • Main Structure of Software is completed

  • Improvements

  • Optimize the performance

  • Decrease the response time

  • Increase Accuracy

  • Ensure Stability


Alice dcs workshop cern march 2006

Concept of connecting the

High Voltage Distribution System to DCS-Bord

Rack 0

Rack 1

Crate 0

Crate 0

Module 0

Module 1

Module 2

Module 0

Module 1

Module 2

Crate 1

Crate 1

Module 0

Module 1

Module 2

Module 0

Module 1

Module 2

Crate 2

Crate 2

Module 0

Module 1

Module 2

Module 0

Module 1

Module 2

Crate 3

Crate 3

Module 0

Module 1

Module 2

Module 0

Module 1

Module 2

Crate 4

Crate 4

Module 0

Module 1

Module 2

Module 0

Module 1

Module 2

Crate 5

Crate 5

Module 0

Module 1

Module 2

Module 0

Module 1

Module 2

Crate 0

Module 0

Module 1

Module 2

Card 0

Channel 0

Channel 1

Channel 2

Channel 3

Channel 4

Channel 5

Card 1

Channel 0

Channel 1

Channel 2

Channel 3

Channel 4

Channel 5

Card 2

Channel 0

Channel 1

Channel 2

Channel 3

Channel 4

Channel 5

Card 3

Channel 0

Channel 1

Channel 2

Channel 3

Channel 4

Channel 5

Card 4

Channel 0

Channel 1

Channel 2

Channel 3

Channel 4

Channel 5

  • Layout of a Rack:

  • Layout of a Crate:

  • Layout of a Module:

 TRD Stack

 TRD Supermodule


Alice dcs workshop cern march 2006

  • Architecture of the CAN network inside one rack:

DCS Board 0

Crate 0

Module 0

Card 0

Card 1

Card 2

Card 3

Card 4

Module 1

(Internal architecture

similar to module 0)

Module 2

(Internal architecture

similar to module 0)

Crate 1

(Internal architecture

similar to crate 0)

DCS Board 1

(Optional)


Control parameters

Control Parameters


Alice dcs workshop cern march 2006

RAMPING


Error messages

Error Messages

  • Voltage Errors

    • Over Voltage

      • message: max allowed voltage is exceeded

      • action: voltage is set to the max allowed value

    • Under Voltage

      • message: min allowed voltage is out of range

      • action: voltage is set to the max allowed value

    • Limits Error

      • message: set value is out of limits

      • action: limit is set to the default value

  • Current Errors (Hardware Error)

    • Over Current

      • alarm: max allowed current is exceeded or a short-circuit occurred

  • Ramping Errors

    • Ramping Rate

      • message: max allowed rate is exceeded

      • action: rate is set to the max allowed value

    • Ramping End Value

      • message: end value is out of limits

      • Action: value is set to the max allowed

    • Limits Error

      • message: set value is out of limits

      • action: limit is set to the default value


Alice dcs workshop cern march 2006

Error Messages (Hardware Errors)

Error No

PVSS Msg

User Actions

Technical Info

Description

301

Error in Voltage ADC communication detected

Warning: Communication error detected in voltage measurement system. The warning appears for the first and second time this error occurs.

Communication error

in Voltage measurement System

No action. Channel must be inspected

Control error on Voltage measurement

Activate the emergency ramp down

Emergency Ramp-Down Procedure may be activated. Channel has to be switched off.

302

Voltage ADC communication failed

Due to three (or more) successive comm. errors the channel voltage control is halted. This affects Voltage Measurement, Over-Voltage, Ramp Functions.

303

Error in ISO ADC communication detected

Warning: Communication error detected in current measurement system. The warning appears for the first and second time this error occurs.

Communication error

in Current measurement System

No action. Channel must be inspected

Control error on Current measurement

Activate the emergency ramp down

Ramp down and switch off the channel, or ignore.

304

ISO ADC communication failed

Due to three (or more) successive comm. errors the channel current Measure is halted. This affects Current Measurement, Over-Current Functions.

Emergency Ramp Down Procedure: This is a special function that ramps down the channel but the rate may be different from the set one. (We suppose that the voltage measurement system is out of order)


Alice dcs workshop cern march 2006

Error No

Technical Info

Description

PVSS Msg

User Actions

305

Max Voltage DAC Value exceeded

Voltage Value has reached the lowest hardware possible value . This occurs due to either wrong voltage set or error in voltage control system

Voltage can not be reduced to the desired value

Ramp down channel, and then switch it off

306

Min Voltage DAC Value exceeded

Voltage Value has reached the highesthardware possible value. This occurs due to either wrong voltage set or error in voltage control system

Voltage can not be increased to the desired value

Ramp down channel, and then switch it off

307

Hardware Error on channel

Due to previous events the control of the channel is halted

Channel out of order

No action. Actions should have been taken during the previous events

308

SJA1000 (Can Controller) Errors

From this error # the error messages are related with SJA1000 (can controller ) hardware errors. Multiple errors in a short period of time, may be a sign of future loss of the card.

General Communication Error

(error #)

Card has to be inspected


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