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CLS LINAC Operator Interface - PowerPoint PPT Presentation

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CLS LINAC Operator Interface. By Hao Zhang. Topics. Background Requirements Design and Implementation Injection Status Screen Machine Protection Screen LINAC Master Display Benefits and Future Demo Questions. Background.

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  • Background

  • Requirements

  • Design and Implementation

    • Injection Status Screen

    • Machine Protection Screen

    • LINAC Master Display

  • Benefits and Future

  • Demo

  • Questions


  • The operation of LINAC is a complicated process. The numbers of PVs and EDM screens involved can be overwhelming

    • Eg, for successful injection, thousands of PVs are involved and those PVs are contained in a couple of different EDM screens


  • give the operator a snapshot of the status at one glance

  • pin point each individual PV when necessary

  • A quick and easy way to navigate through different EDM screens

Design and implementation
Design and Implementation

  • Injection Status Screen

  • Machine Protection Screen

  • LINAC Master Display

Design injection status screen
Design – Injection Status Screen

The Injection Status Screen

Design injection status screen1
Design – Injection Status Screen

Status indicator matrix: How PVs are organized

  • Row : sub-systems

  • Column: key components

Design injection status screen2
Design – Injection Status Screen

Indicator color definition: How status is represented

Design injection status screen3
Design – Injection Status Screen

Sub-screens: Display components info in a sub-system

  • Clicking on indicator brings up a sub-screen

Design injection status screen4
Design – Injection Status Screen

Related displays: links to other EDM screens

Implementation injection status screen
Implementation – Injection Status Screen

  • A group status PV is created to indicate the collective status of a group of components in a sub-system.

    Eg. PVLTB1:IOP:status gives the collective status for all the ion pumps in the LTB

  • The group status PV monitors all individual PVs in this group and calculate the group status. Different algorithms are used for different types of PVs.

    Eg. The most common algorithm finds out the highest alarm level in all the individual PVs and pass it to the group PV.

Implementation injection status screen1
Implementation – Injection Status Screen

Example: pass highest alarm to the group PV

Design linac machine protection screen
Design – LINAC Machine Protection Screen

Overview of LINAC machine protection system


  • a PLC system

  • a hardware interlock system


  • monitors ion pumps, CCGs, flow switches, thermo couples, and other devices in the Gun, RF, and vacuum sections

  • interfaces with other systems such as the ACIS system, modulator controls, and the LTB machine protection system

  • Shut down vacuum valves, disable Gun and RF to protect them when necessary

Design linac machine protection screen1
Design – LINAC Machine Protection Screen

The LINAC Machine Protection Screen:

  • displays the status of those devices

  • helps diagnose problem when the machine protection system trips beam

Implementation linac machine protection screen
Implementation – LINAC Machine Protection Screen

EPICS PVs are created based on the PLC variables. Modbus Ethernet driver is used for the mapping from Modicon Momentum PLC variables to EPICS PVs.


  • Simple , self-explanatory, and user friendly

  • Better organization of PVs and control screens

  • A handy tool to help identify problems

  • Shortened the average time taken to return the storage ring to service after a trip


  • More indicators are to be added into the grid status indicator matrix as new devices are installed into the system

  • More screens are to be integrated into the master display as the system evolves

  • Considering extend the indicator color key definition so that more status can be identified. The newly addition of the bypass indicator is the first step.


  • Injection Status Screen

  • LINAC Machine Protection Screen

  • LINAC Master Display