PLC DEVELOPMENTS FOR NEW VACUUM DEVICES IN THE LHC AND NA62

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Presentation transcript:

PLC DEVELOPMENTS FOR NEW VACUUM DEVICES IN THE LHC AND NA62 TE-VSC-ICM Automation Forum João Rodrigo Alvelos Ferreira 20th November 2014 TE-VSC-ICM

SUMMARY LARGE HADRON COLLIDER NA62 EXPERIMENT Cryogenic Interlocks for the Sector Valves Control devices for the new NEG Pumps in the LSS Controls devices for the new Thermocouples in the warm magnets 8DI_FE interlock monitor NA62 EXPERIMENT Control devices for the Cryogenic Pumps in the main tube Control device for the Pulsed Valve VAT-VP3 controller Control device for the Pfeiffer MPT-200 Full Range Gauge (DP) ALARM_DO interlock generator

CONTROL DEVICES FOR THE LHC

LHC | Sector Valve Cryogenic Interlocks The LHC Sector Valves isolate the different vacuum sectors in the LHC. They are currently interlocked with the adjacent Sector Valves and local pressure and temperature values. A new software interlock had to be implemented, closing the sector valves in case of temperature rise in the cryogenic system, which might lead to a pressure rise.

LHC | Sector Valve Cryogenic Interlocks ITL_CRYO_VSS only produces a valid interlock signal in case there is no problem detected with the ethernet connection and the watchdog has increased VVS will only close the valves in case the CLOSE_ENABLE bit is set (meaning that there is no chance the beam could be circulating) Physical/Control Architecture of the SVCU sector valves cryogenic interlock

LHC | Sector Valve Cryogenic Interlocks Reverse engineer the communication protocol between PLC and SVCU cards, in order to understand how to send commands (DONE) Implement new code to obtain and process the CRYO_MAINTAIN signal from the Cryogenic System PLCs (DONE) Implement the new interlock input and logic in the existing SVCU PLC control block (DONE) Test the system in the lab (DONE) Implement all the interlocks and deploy the solution to the LHC PLCs (WAITING FOR PERMISSION TO TEST ON THE LHC AND IMPLEMENT IN PRODUCTION) SVCU Crates in the LHC

LHC | NEG Pumps Getter pumps were installed during the LS1 in order to increase the pumping speed in the Long Straight Sections in the LHC. These are essentially NEG cartridges, a material that once activated helps complete or maintain ultra high vacuum by adsorpting small ammounts of gas. The NEG is activated by being heated to a suitably high temperature, for a defined time. NEG Cartridges A control system must be developed to remotely activate the pumps once they’re installed in the LHC. Activation must be performed under certain conditions (the NEG must be under vacuum) and remotely monitored through the Vacuum SCADA.

LHC | NEG Pumps 16 Volt for 60 minutes

Physical Architecture of the NEG Pumping System LHC | NEG Pumps Physical Architecture of the NEG Pumping System

Control Architecture of the NEG Pumping System LHC | NEG Pumps Control Architecture of the NEG Pumping System

Block communication in the NEG pumping system LHC | NEG Pumps Block communication in the NEG pumping system

LHC | NEG Pumps SCADA MUX + PSU Panel SCADA NEG Pump Panel

LHC | Thermocouples for Warm Magnets Thermocouples were installed during the LS1 to measure the temperature of the warm magnets in the LHC-LSS. These measurements must be available in the vacuum SCADA and archived to the relevent databases. Thermocouple Thermocouples are the most common way to do it. They consist simply of two different conductors, placed in contact, which produce voltage due to temperature gradients. This voltage can be directly measured by a PLC and converted into a temperature.

Hardware Architecure for the temperature measurement system LHC | Thermocouples for Warm Magnets Hardware Architecure for the temperature measurement system

Hardware Architecure for the temperature measurement system LHC | Thermocouples for Warm Magnets VRJ_TC Hardware Architecure for the temperature measurement system

LHC | 8DI_FE Digital Input Monitor Each device allows the monitoring of 8 digital inputs. The main goal of the device is to monitor interlock signals, so falling edges are detected and timestamped and must be acknowledged. Object States are implemented, so the device can be used and an interlock source (interlock is sent in case any of the monitored inputs is false)

CONTROL DEVICES FOR THE NA62 EXPERIMENT

Full Cryogenic Pump assembly NA62 | Cryogenic Pumps The vacuum level in the main NA62 tube must be particularly high, which is why seven cryogenic pumps are installed throughout its length. These pumps consist of a complex assembly with valves, cryogenic head, compressors and gauges, all controlled by a PCA700C controller. This controller must be interfaced to the SCADA in order to provide remote control and monitoring. Full Cryogenic Pump assembly

Hardware Architecture for the cryogenic pump control system NA62 | Cryogenic Pumps Hardware Architecture for the cryogenic pump control system

Control Architecture for the cryogenic pump control system NA62 | Cryogenic Pumps Control Architecture for the cryogenic pump control system

Example of command flow for the valve / pump / controller system NA62 | Cryogenic Pumps Example of command flow for the valve / pump / controller system

Peiffer MPT200 Full Range Gauge NA62 | Pfeiffer MPT-200 Full Range DP Gauge The range of Pfeiffer DP gauges comes in different flavours – Penning + Pirani, Pirani + Membrane, Membrane, ... All the measuring activities and sensor switching are handled by the gauge, which operates as a normal DP slace. The VG_DP implements the communication and management of this gauge. The device is based on VG_STD, so its use on the vacuum control software is perfectly transparent (read registers are similar and interlock data resides in the same memory addresses) Peiffer MPT200 Full Range Gauge

VAT VP-3 Pulsed Valve Controller NA62 | VP-3 Pulse Valve Controller The VAT VP-3 controls the large pulsed valves used to isolate the LKr Calorimeter in NA62. It’s a bistable device. To open the valve a 10ms pulse is required in the OPEN digital input. To close it, the same must be done in the CLOSE DI. The PLC control device that was developed is fully configurable: pulse width can be defined, monitoring of remote and inrush signals can be disabled or enabled. The device is also interlockable. The PLC block can also be used to control the VAT-VF2 controller and the SPS pulsed valves (with no dedicated controller). VAT VP-3 Pulsed Valve Controller

NA62 | ALARM_DO Device 1 Device 2 Generates a new interlock signal from the state of two different devices. Interlock source (Object State or Physical Value) can be chosen. Combination logic (AND/OR) between the two devices can be chosen. ALARM_DO can be used both as an interlock source (effectively working as an interlock multiplexer) or to generate a digital output signal from the state of the source devices. ObjectSt or PhysObjVal ObjectSt or PhysObjVal ALARM_DO InterlockSt DIGITAL OUTPUT Device 3

João Rodrigo Ferreira rodrigo.ferreira@cern.ch +41 764 871 719