1. Yu. Guz 14/03/20121 CALO HV ** See also Anatoli’s slides for the 2009 piquet training ** http://indico.cern.ch/getFile.py/access?contribId=3&resId=0&materialId=slides&confId=70825

2. Yu. Guz 14/03/20122 2 xCAL HV system hardware (x  {E,H}) Each xCAL PMT installed on the detector wall is equipped with an individual Cockcroft-Walton (CW) HV generator. Each requires DC power (+6V, -6V and +90V), and a control voltage determining the HV value. Total of 40 control and distribution boxes are installed at the chariots and at the CALO platform: 32 ECAL, 8 HCAL These control boxes provide: DC power and control voltages for the xCAL CW generators; DC power and control voltages for LED drivers (NB decoupled from common ground) bias voltage for PIN photodiodes and DC power for their amplifiers The output voltages are controlled: control voltages for CWs – SPECS DCU voltage at +6V and -6V CW power lines – SPECS DCU control voltage for LEDs – dedicated ADC LV&MV in CW control CW power LED/PIN power, LED control SPECS HCAL ECAL Inputs: +6V, +7V, -7V, 15V : DCS LV, from MARATONs (platform) +90V, -25V : DCS MV, from Agilent PS (D3) SPECS communication input Outputs: 8 power lines for xCAL CW (up to 40 CWs on each line) DAC control of up to 200 xCAL CW bases 8 outputs with LED/PIN power + 2 LED control each SPECS output Output protection on the CW DC power outputs: +6V -6V : fuses +90V : relays

3. 48 LVDS From LEDTSB Yu. Guz 14/03/20123 3 PS / SPD HV system hardware The PS/SPD MAPMT modules use HV produced by CW generators installed at the CALO platform. The HV system is arranged in two crates (one per side, in racks L3B03 and L3B13). Each crate contains: 1 DAC module, 11 CW modules (5 PS, 5 SPD, 1 spare); LED control board. Each CW module contains 10 CW generator mezzanines and serves 10 MAPMTs. Inputs: +7V, -7V : DCS LV, from MARATONs (platform) +150V : DCS MV, from Agilent PS (D3) SPECS communication Outputs: 110 HV outputs for MAPMTs 10 DAC outputs for LED control DAC module CW modules LED control

4. Yu. Guz 14/03/20124 4 Rack D3B04 in D3 4 Agilent power supplies for HCAL, ECAL, PRSA and PRSC (+ one power supply +5V for the CALO Status Bit board, not discussed here). MV The MV necessary for the CALO HV is provided by Agilent power supplies (PS1—PS4): HCAL, ECAL: two N6701 power frames, each with 2 N6776 (100V ) and 2 N6734B (30V) units, produce +90 V for CW bases (1 per side) and -25 V for PIN photodiode bias (1 per side) PS/SPD : two 1-channel N5750A power supplies producing +150 V for CWs (1 per side). Ch 1Ch 2Ch 3Ch 4 PS1hcagil01+90V HCAL A-25V HCAL A+90V HCAL C-25V HCAL C PS2ecagil01+90V ECAL A-25V ECAL A+90V ECAL C-25V ECAL C PS3psagil01+150V PRS A PS4psagil02+150V PRS C Served by the CADCSMV project running on CADCS01W. The PVSS control is based on standard MARATON software; the Agilent commands and readings are relayed into MARATON datapoints via DIM. Each Agilent box is served by an individual communication executable installed as a service on CADCS01W. One service per PS HCAL PRS C PRS A ECAL The LV control: see Patrick’s slides

5. Yu. Guz 14/03/20125 5 MV Few things to remember: switch MV ON/OFF only at the HV OFF state, for the sake of safety; the MV is ramped up rather slowly, ~3 min for HCAL and up to 5 min for ECAL and PRS. During the ramp, the Agilent DIM applications are not responding and FSM state does not change. Be patient. Only larger time interval may indicate problems. the protection state of a power supply channel (overcurrent, overvoltage etc) leads to the FSM ERROR state. The RECOVER FSM command or OFF button of the device panel switches off this particular channel and resets its protection (no need any more to reset the whole power supply).

6. Yu. Guz 14/03/20126 6 ECS HV control Control PCPVSS project PRS CPSDAQHVC01WPRSHVC1 PRS APSDAQHVA01WPRSHVA1 ECAL CECHVC01WHCHVC1 ECAL AECHVA01WHCHVA1 HCAL C HCDAQHVC01W ECHVC1 HCAL AHCDAQHVA01WECHVA1 Six separate PVSS projects on six control PCs. They are included into the LHCb FSM hierarchy, so that the HVs are controlled centrally. On top of it, many tools are available for piquet / expert operations: manipulations with recipes switching ON/OFF/masking individual channels, modification of their parameters modify DAC box parameters, exclude or include it into the FSM hierarchy Three main FSM states are used: OFF, STANDBY1, READY. Corresponding FSM commands are Go_OFF, Go_STANDBY1 and Go_READY.

7. Yu. Guz 14/03/20127 7 ECS HV control All the six projects have similar structure. The FSM / central operation is based on a permanently running worker script (“monitoring”) which: at a period of ~ 20 sec, reads out all the DAC values, voltages measured at the LV DC power lines, status of the relays at the MV lines; in case of unexpected readings, it produces alarms at the alarm screen or device ERROR state upon arrival of a FSM command, it ramps the device to the desired state restart it Control manager running the monitoring script The monitoring script sends a short report to the log screen after every readout cycle. Absence of such reports mean that the monitoring task is stuck. This typically happens at a project restart at LV not in READY state. In this case, the corresponding PVSS manager is to be restarted. In every case of strange behavior of a CALO HV project, it can be useful first to check the status of its monitoring manager, and restart it if needed

8. Yu. Guz 14/03/20128 8 ECS HV control: xCAL U MV, I MV current recipe name generate HV for given gain get HV settings from CaloDb save as a recipe The project panel. A lot of piquet / expert functionality. Useful for piquet: MV voltage and current display preparation of HV:  constant PMT gain  custom HVs from an ascii file  custom HVs from the calo database manipulation with recipes: displays current recipe and full list of existing recipes; allows saving current datapoint values into a recipe search connectivity NB Channel numbers start from 0 in the database, but from 1 in the DAC box panels! Shown is channel 95 of box 24.

9. Yu. Guz 14/03/20129 9 ECS HV control: xCAL Voltages at CW power lines manual control section First enable it! NB this pauses the “monitoring”! It resumes only on closing the panel status of MV relays DAC box common settings: HV ramp time; MV relay reaction time individual channel operation panel. One can set the STANDBY and PHYSICS HV, as well as switch it OFF (“mask”).

10. status of MV relays MV relay control Best to do at MV OFF Yu. Guz 14/03/201210 ECS HV control: xCAL individual channel operation panel.

11. Yu. Guz 14/03/201211 ECS HV control: xCAL The “FollowMe” panel may be useful for the system initialization (e.g. at a recovery from power cut)

12. Yu. Guz 14/03/201212 ECS HV control: PRS Very similar functionality

13. Yu. Guz 14/03/201213 ECS HV control: PRS Very similar functionality MV of each CW channel is protected with a relay. Settings of individual channels

14. Yu. Guz 14/03/201214 CALO_HV_TOP panel (CA2) Shows CALO HV status. If number of channels ON is less than nominal (sometimes happens for ECAL, because of SPECS errors), the Go_READY command should be re-sent (use DEFAULT recipe, identical to PHYSICS). Important figures are MV current consumptions. They are normally very stable(*), deviations may indicate real problems. The trends can be best displayed via lbTrending (next slide). (*) the ECAL MV current slowly decreases, because of radiation effects in the central CW bases; this is normal.

15. Yu. Guz 14/03/201215 MV currents in lbTrending Use shortcut G:\online\ecs\Shortcuts38\LHCb\LBECSINFO\LBECSINFO_UI_lbTrending.lnk MV currents are being archived; any time interval can be displayed

16. Yu. Guz 14/03/201216 Error states, alarms xCAL LV outputs for CWs Protected by fuses: 1A conventional fuses || 0.5A resettable ones. If LV values differ significantly from 6V, warning or alarm produced (visible at the shifter’s alarm screen, also with shortcut G:\online\ecs\Shortcuts38\LHCb\LBECSINFO\LBECSINFO_ UI_fwAlarmHandlingScreen.lnk ). The limits are: U < 5.3 V : WARNING (yellow). The conventional fuse is burned, the resettable one is alive (which causes certain voltage drop). The CWs remain operational, the broken fuse is to be replaced at the next occasion (expert action). U < 3.5 V : ERROR (orange). Both conventional and resettable fuses are dead, the 20-40 CWs belonging to this power line are not operational (this will be visible by other means). The conventional fuse should be replaced as soon as possible. xCAL MV relays The MV output of each CW power line is protected by a relay controlled by a protection system. It opens the relay in case of overcurrent (>100 mA). An open relay means that the 20-40 CWs belonging to this power line do not work. In this case an ERROR at the alarm screen is produced. Piquet action: try to close the relay using the corresponding DAC box panel. if unsuccessful: ‒ switch OFF HV then MV at this subdetector side ‒ close the relay ‒ switch ON MV then HV if unsuccessful again, call expert. An access can be needed. The FSM ERROR state can be produced because of SPECS errors. Check the LV ON state; try to switch the affected board(s) OFF and ON; restart the project and the SPECS server. If unsuccessful, one can exclude the affected DAC boxes from FSM; access may be necessary (e.g. to replace a dead DAC mezzanine).