1. 1 LHCb CALO meeting 4.02.09 Anatoli Konoplyannikov [ ITEP / LAPP ] Introduction Status bits of the LHCb readout supervisor ODIN HVSB board specification HVSB board block diagram Board consideration Planning of the board development and production CALO HV Status bits for ODIN

2. 2 LHCb CALO meeting 4.02.09 Anatoli Konoplyannikov [ ITEP / LAPP ] CALO HV Status bits for ODIN Introduction All calorimeter HV systems (ECAL-HCAL, PRS) are based on CW DC – DC convertors. The pumping middle voltages are produced by Agilent power supplies. The HV_LED_DAC boards distribute the 80 V power to ECAL and HCAL CW bases and PRS HV boards equipped with CW convertors are used the 150 V. The current consumption from middle voltage power depends of a HV value. For HV PHYSICS settings expected current consumption is about: 3 mA per channel for PRS ; 0.3 A for one sub-detector side of 100 channels. 0.5 mA per CW base for ECAL; 1.5 A for one sub-detector side of 3008 channels. 0.6 mA per CW base for HCAL; 0.4 A for one sub-detector side of 744 channels. ECAL and HCAL MV power is distributed to a group of CW bases. From 16 to 40 bases in one group are powered by one line. Each power line has the over current protection relay that goes off when a current is over limit and after this the 100 V power supply current is changed on 10 – 35 mA. This estimation shows a needed sensitivity of a current monitoring circuitry that will be produced the HV Status bits for ODIN. In case if a part of the CW bases is OFF or the MV power supply current is high (near the current limit setting) we can set the ODIN status bit to ON (it will mean detector in Bad condition). Design of a simple electronics board for a power supply current measurement and transmission the status bits with needed levels to ODIN is under progress now.

3. 3 HCAL,ECAL,PRS 100 V Power Supplies Rack with CALO MV Agilent Power Supplies 100 V power long distance cables to detectors ODIN LVDS RJ45 cables Sketch of the possible implementation sending status bits to ODIN Barack D3 to Electronics platform New electronics board “HV Status Board” ( HVSB ) HVSB board functionality:  Fast measurement MV power supply currents.  Produce the “warning” LVDS signal (one bit per sub-detector) to the ODIN in case when the power current is out of range.  Board equipped with DAC, comparator and logic IC’s.  The Specs mezzanine will be used for DC levels measurement by DCU-ADC and communication with ECS. SPECS RJ45 cable to control PC in D2 SPECS Mezzanine LHCb CALO meeting 4.02.09 Anatoli Konoplyannikov [ ITEP / LAPP ] CALO HV Status bits for ODIN Additional LV power supply for HVSB board

4. 4 LHCb CALO meeting 4.02.09 Anatoli Konoplyannikov [ ITEP / LAPP ] CALO HV Status bits for ODIN Logic FPGA ACTEL or ALTERA LVDS drivers to ODIN Block diagram of HVSB board SPECS Mezzanine 12 DAC IC’s 6 chan. DCU-ADC ECAL_A MV line ECAL_C MV line HCAL_A MV line HCAL_C MV line PRS_A MV line PRS_C MV line I to V Converter Parallel Bus I2C bus Max levelMin 12 comparators Status Indicators SPECS Bus

5. 5 LHCb CALO meeting 4.02.09 Anatoli Konoplyannikov [ ITEP / LAPP ] CALO HV Status bits for ODIN Board consideration There is one open question concerning of the power supplies DC decoupling. There are two possibility. First one is connect the ground lines of the MV power supplies together or other one is use an opto-coupling technique for keeping the ground lines separated. In the first case an analog part of the HVSB board is much simple, but some tests will be needed for verifying EMC noise. In the second case an analog part is more complicated and linear optocoupled amplifier can be used. For example a linear Amplifiers the IL300 Optocoupler produced by Vishay Semiconductors could be used for implementation the current to voltage converter. Positive Unipolar Photovoltaic Amplifier Schematic of the linear optocoupled amplifier.

6. 6 LHCb CALO meeting 4.02.09 Anatoli Konoplyannikov [ ITEP / LAPP ] Detector HV Status bits for ODIN HVSB board consideration Mechanical implementation and board powering. Mechanical implementation of the HVSB board could be similar the HV_LED_DAC implementation with simple non standard mechanics. The board will be inserted into the rack with MV Agilent power supplies. The low voltage power supply (Agilent PS) will be placed under the HVSB board in the same rack (see sketch on slide 3). SPECS Mezzanine Logic FPGA Status Indicators Drivers to ODIN Analog Circuits Input/Output MV connectors 160 232 LV Pwr Specs RJ45 Sketch of the HVSB printed circuit board with main components placement

7. 7 Conclusion & Planning  The possible solution of the CALO sub-detector status bit realization has been presented. The solution is based on the MV power supply current measurement.  Together with Cyril perform an analog part simulation and prototype test of the HVSB board.  Order needed electronic components.  Start a board development using CADENCE software at CERN and LAPP.  Develop firmware for control logic FPGA.  Develop PVSS project for monitoring and control HVSB board.  Develop a DIM server for an additional LV power supply and integrate power control into existing PVSS project. CALO HV Status bits for ODIN LHCb CALO meeting 4.02.09 Anatoli Konoplyannikov [ ITEP / LAPP ]