Transcript (I) ALICE DCS Workshop CERN, November 2007 HV Control System

The ALICE TRD - HVDistribution System
A. Markouizos, P. Mantzaridis, P. Mitseas,
A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou
Athens University
ALICE DCS Workshop
CERN, November 2007
Outline
1.
HVD system @ CERN
2.
HV Control System
3.
Magnetic field test

Setup and procedure

Results
4.
Test on the TRD – SM II
5.
Current status – Future Plans
ALICE DCS Workshop
CERN, November 2007
HVD system @ CERN
1 Anode + 1 Drift Crate @ P2 to power 3 TRD - SMs
Each crate contains:
• 1 DCS Board
• 1 Backplane
supplies the Master HV to each card
distributes the isolated LV to the active components
enables the CAN bus communication
• 15 HVD cards
• 8 Transformer boards
for the auxiliary power supplies on each HVD card
• 4 LV power supplies (5V, ±12V)
ALICE DCS Workshop
CERN, November 2007
HVD Crates and Card images
ALICE DCS Workshop
CERN, November 2007
Specifications of the HVDS
•
-
Anode Voltage
dynamical range
ramp-up rate
ramp-down rate
voltage stability
voltage readout
max. current
response time
(e.g. overcurrent)
900 – 1900 V
up to 30 V/s
up to 100 V/s
DV < 50 mV
10 Hz
6.3 mA
< 50 ms
ALICE DCS Workshop
CERN, November 2007
Specs. (cont)
•
-
Drift Voltage
dynamical range
ramp-up rate
ramp-down rate
voltage stability
voltage readout
max. current
response time
(e.g. overcurrent)
1450 – 2450 V
up to 30 V/s
up to 100 V/s
ΔV < 50 mV
10 Hz
260 mA
< 50 ms
ALICE DCS Workshop
CERN, November 2007
Error Messages (Hardware Errors)
Error
No
Technical Info
Description
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.
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.
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.
301
304
PVSS Msg
User Actions
Communication
error
in Voltage
measurement System
No action. Channel
must be inspected
Control error on
Voltage measurement
Activate the
emergency ramp down
Emergency RampDown Procedure may
be activated. Channel
has to be switched off.
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.
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)
Error
No
305
306
Technical Info
Description
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
Min Voltage
DAC Value
exceeded
Voltage Value has reached the highest
hardware possible value. This occurs due to either
wrong voltage set or error in voltage control
system
PVSS Msg
User Actions
Voltage can not be
reduced to the desired
value
Ramp down channel,
and then switch it off
Voltage can not be
increased to the
desired value
Ramp down channel,
and then switch it off
Channel out of order
307
Hardware
Error on
channel
Due to previous events the control of the channel
is halted
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.
No action. Actions
should have been
taken during the
previous events
General
Communication Error
(error #)
Card has to be
inspected
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
HV Control System (I)
ALICE DCS Workshop
CERN, November 2007
HV Control System (II)
ALICE DCS Workshop
CERN, November 2007
HV Control System (III)
ALICE DCS Workshop
CERN, November 2007
HV Control System (IV)
ALICE DCS Workshop
CERN, November 2007
HV Control System (V)
ALICE DCS Workshop
CERN, November 2007
HV Control System (VI)
ALICE DCS Workshop
CERN, November 2007
Magnetic Field Test
• Tests performed in the MNP22 Facility at CERN
• The Anode (Drift) crate gets 15 HV inputs each from one ISEG
EHSF630p-F HV module (two ISEG EHS8630n-F HV
modules),mounted on an ISEG crate
• Combined HV system (ISEG+HVD) controlled and monitored
by the developed PVSS project running on a laptop
ALICE DCS Workshop
CERN, November 2007
Test Procedure
• Each crate tested separately
• HV set at -2.4 kV (Drift), 1.8 kV (Anode)
• B increased from 0 to 220 Gauss
• Both field polarities
• Two crate configurations
• Successful over current test
ALICE DCS Workshop
CERN, November 2007
HVD crate configurations
ALICE DCS Workshop
CERN, November 2007
Results: Drift HVD @ -2.4 kV
magnet on
magnet off
σ < 14 mV
ALICE DCS Workshop
CERN, November 2007
Results: Anode HVD @ 1.8 kV
magnet on
magnet off
σ < 14 mV
ALICE DCS Workshop
CERN, November 2007
Test on the TRD - SM II
• HVD system
connected with the
SM-II
• Anode voltage @
1.45 kV
Drift voltage @
-1.5 kV , -1.9 kV
• Successful
overcurrent test
ALICE DCS Workshop
CERN, November 2007
Results: Test on the TRD - SM II
Anode HVD @ 1450 V
Drift HVD @ 1900 V
σ < 15 mV
ALICE DCS Workshop
CERN, November 2007
Current status – Future plans
• Another 2 HVD crates (1 anode + 1 drift) will be delivered at
CERN in November:
– 4 crates in total to power 6 TRD – SMs
• HVD control system:
completion of the FSM
integration to the TRD/DCS
• Installation at Point 2
ALICE DCS Workshop
CERN, November 2007
Thank you!
ALICE DCS Workshop
CERN, November 2007
Backup
ALICE DCS Workshop
CERN, November 2007