Il sistema di HV del Il sistema di HV del sottorivelatore DT sottorivelatore DT
S. Braibant, P. Giacomelli, M. GiuntaS. Braibant, P. Giacomelli, M. Giunta, E. Borsato, E. Borsato
Bologna, 20/01/2007
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DT HV electrodesDT HV electrodes
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HV layoutHV layout
1 chamber
Inside SY1527
A876
A877
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HV layoutHV layout
1 macrochannel= 1 layer
= 4 HV channels
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HV Hardware setupHV Hardware setup
Global HV+
Global HV-
LV
A877 powers 1 DTA876
HV THETA
HV PHI1
HV PHI2
MacroChannels MacroChannels
(Set ON/OFF, RuP,…)(Set ON/OFF, RuP,…)
HV LAYER1
OutputChannOutputChannels els
(Set V0, i0…)(Set V0, i0…)
Wires1Wires0
Cathodes
Strips
>100 m
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HV layoutHV layout
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HV modulesHV modules• 10 SY1527 (8 used by HV, 1 by LV, 1
spare)• 65 A876 (60 used, 5 spares)• 250+10 A877 (190+10 with 3 connectors,
60 with 2) (240 modules used, 10+10 A877/3 spares)
• Apart from 5 A876, all modules have been received at CERN
• All modules have been tested
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HV modulesHV modules• A876
60/60 modules received (77 produced by CAEN) 3 showed problems and have already been repaired (for 2 of those
CAEN did not observe anything wrong)• A877
With 2 connectors 60/60 received (63 produced by CAEN) Sent back to CAEN 12, on 7 nothing wrong found, on the remaining
5 some electronics faults were found (active components changed, hv cable disconnected, calibration redone, etc.). Repaired.
With 3 connectors 190/190 received 35 (!!) have been sent to CAEN to be repaired. On 15 modules
nothing wrong found, on the other 20 found electronics problems (active components changed, hv cable disconnected, calibration redone, etc.). Repaired.
• Still at CAEN 4 A877
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HV slow controls softwareHV slow controls software• Slow controls software is based on the
SCADA environment PVSS.• We have the largest slow controls system in
operation at CERN with more than 15000 channels to control and monitor.
• When all channels will be operated together we will have 6 dedicated PCs to run the software as a distributed environment.
• Our slow controls system can be operated as stand alone or connected to the central CMS DCS.
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DT HV SystemDT HV SystemHV System
HV Wheel-2 HV Wheel+2HV Wheel-1 ……….
HV MB1 HV MB4……..
HV Chamber 1 HV Chamber 14……..
HV SL 1 HV SL 2 HV SL 3
HV L1 HV L2 HV L4HV L3
IBeamsWires 1 StripsWires 0 DUs
CUs
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HV DUs & CUsHV DUs & CUs• 3 types of DUs:
FwCaenChannelWires FwCaenChannelStrips FwCaenChannelIBeams
States based on dpe actual.status & actual.vMon
• CUs: HVLayerNode
States: ON, OFF, RAMP_UP, RAMP_DOWN, OVERCURRENT, WARNING, TRIPPED, ERROR, ……
HVSLNode (“Translator” node type) States: PHYSICS, READY, NOT_READY, WARNING, ERROR, ……
HVGenericNode (for Chamber, Station and Wheel level?)
States: PHYSICS, READY, NOT_READY, WARNING, ERROR, ……
DT Interactive UIDT Interactive UI
(by R. Gomez-Reino Garrido)
• Java ActiveX based User Interface
• Reads geometry descriptions from EMDB
• Completely interactive
• Good for error tracking and correlation
• Easy integration into the supervisor
FEATURES:
FOR DEVELOPERS:
• Easy to use from PVSS
• Functions providing full control of the detector 3D panels.
• Create labels
• Create behaviors
• Automatically move the view and rotation points.
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Example Example
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Included functionalities (I)Included functionalities (I)• Monitoring, settings, FsMs trees,…• Java Interface (R. Gomez-Reino)
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Included functionalities (II)Included functionalities (II)• Connection to Oracle Configuration Db
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Included functionalities (III)Included functionalities (III)• Connection to Oracle Condition Db
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Procedures implemented Procedures implemented • Ramp up (single layer) in 4 steps:
3(1) intermediate state for Wires(Strips and I-Beams)• Ramp down in 2 steps
1 intermediate state for Wires• Recover from Trip:
Switch off the whole layer; after a delay switch on the layer using the ramp up procedure (check trip frequency, currents,…)
• OvC handling: If OvC on Strips or I-Beams lower Wires voltage by 200 V A877 boards not current limited; trip condition handled via software (now
hardware trip time available too)• Voltage difference check:
Every 20 sec. check of voltage difference btw Strips and Wires; if bigger than 1850 V (i.e. discharge regime), Wires voltage lowered by 200 V
• Check communication with power supplies
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ConclusionsConclusions
• We have all the modules of the HV system in hands at Cern. HV modules test was finished several months ago.
• All the A877 modules have been installed in the racks on the balconies
• Slow controls software ready and in operation since a long time.
• We have observed a relatively high number of faults in the A877 modules. Only a few in the A876 modules.
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HV modules testsHV modules tests• 4 different tests:
Test 1: Min. voltage, Max. current Resistive Loads
Test 2: Max. voltage, Max. current RC loads (same of Test 3)
Test 3: Ramping cycles RC loads (same of Test 2)
Test 4: Min. voltage, Null current No loads
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HV modules testsHV modules tests• “OvC with oscillating Voltage”
Observed during Test 1 in the majority of the newer A877 MB4 boards (no problems during Tests 2&3, where boards used in working range)
Hardware differences between the older A877 standard boards and the newer A877 MB4 boards?
YESSome components of the newer boards have a different
tolerance: this was causing a slightly different behavior of the channels in their standard working range → a
capacitor was added to each channelCAEN assures that board performances in the
standard working range is the same for all boards
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ConclusionsConclusions• For the magnet test we plan to power a
total of 14 DTs in sector 10 of wheel YB+1 and sectors 10 and 11 of wheel YB+2.
• The HV system used will be the final one manufactured by CAEN. Also aim at having also final cables, patch panels, etc.
• PVSS project with FSM integrated with the central CMS DCS will be available.
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