Il sistema di HV del sottorivelatore DT S. Braibant, P. Giacomelli, M. Giunta , E. Borsato

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

20/11/2007 Il sistema di HV delle camere DT 2

DT HV electrodesDT HV electrodes


HV layoutHV layout

1 chamber

Inside SY1527

A876

A877


HV layoutHV layout

1 macrochannel= 1 layer

= 4 HV channels


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


HV layoutHV layout


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


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


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.


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


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.


Example Example


Included functionalities (I)Included functionalities (I)• Monitoring, settings, FsMs trees,…• Java Interface (R. Gomez-Reino)


Included functionalities (II)Included functionalities (II)• Connection to Oracle Configuration Db


Included functionalities (III)Included functionalities (III)• Connection to Oracle Condition Db


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


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.


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


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


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.

Il sistema di HV del sottorivelatore DT S. Braibant, P. Giacomelli, M. Giunta , E. Borsato

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