Helen Heath, Magnus Loutit

 Useful meetings at CERN before Easter ◦ ML and HH met with John Fullerton from BE for practical advice on the CEDAR motor controls ◦ Also met with the NA62 DCS group to discuss Motor controls and DCS in general  Detailed minutes of the DCS meeting at

 Information from JF ◦ Once set up the CEDARs are very stable.  CEDAR adjustment is not anticipated to be performed regularly during runs – expert operation ◦ X and Y motors currently take ~30s from one end to the other. ◦ Approach to ~2mm and then pulse.

 EN/ICE group will develop the PLC system and integrate into a UNICOS application ◦ There involvement is now approved ◦ Magnus has produced a Motor Control Specification (attached) ◦ EN/ICE will translate into their standard project specification.  Equipment will be ordered through EN/ICE

Requirement/Description document with details of the control logic to be prepared and sent to EN/ICE: as soon as possible (the week after Easter) Approval of the project by EN/ICE: no later than week of 23 April,  Delivery/Commisioning deadline: mid-June

 Considered Document prepared by Tim  Detailed discussion ◦ Queries circulated in an updated document. ◦ These need to be clarified

Assign to channel a symbolic name Set output voltage (VSET) Set max. output current (ISET) Set output voltage software limit (SVMAX) Set voltage ramp-up speed (RAMP-UP) Set voltage ramp-down speed (RAMP-DOWN) Set TRIP parameter Enable/disable POWER ON option Switch channel ON/OFF Monitor output voltage (VMON) Monitor output current (IMON) Monitor channel status

 Draft Document has TTRP Time at current>ITRP ◦ Not a standard parameter. Is this necessary? Or is setting a trip current sufficient? If not why not? Trip would normally produce a fatal alarm. ◦ Note there is expected to be over and undervoltage warning as well as fatal alarms  Expect Operating voltage (VSET) to be set every run but other parameters would be static from run to run. ◦ Are there any issues with this?

 Board Temperature ◦ Does this need a fatal alarm? It would seem likely but should there be a warning before? Warning might cut off board.  Connection Error ◦ Is this a cable disconnected from the card (seems unlikely) or a loss of control (Note it wasn’t clear that the hardware can detect a disconnected cable).

 We need to add physical layout of the channels – which channel is which PMT ◦ Any logical arrangement is fine someone just needs to do this. Who?

 Nino – control not included in the “012 Technical Run  TEL62  PMT pulser

 Old Gas controls are standalone and will be used in ◦ Will not be integrated in the DCS  Need to discuss whether data will be displayed.  Provision for 8 temperatures to be read out ◦ DCS group would like to know where the sensors are. Are there warnings or are these just for display?

 Status of cooling could be read by the CEDAR Motor control PLC if cooler is near CEDAR ◦ If so then this needs to be added to the motor- control project.  What sort of flow meters are envisaged and how are they connected.  Enclosure monitoring. ◦ Require mapping of temperatures to ELMB channels ◦ Where are the probes?

 Procurement of motor system  Update of DCS document