Development of Embedded Shutter Controller for IMBL Beam line at the Australian Synchrotron. Emmanuel Joseph Vettoor

Transcription

1 Development of Embedded Shutter Controller for IMBL Beam line at the Australian Synchrotron Emmanuel Joseph Vettoor

2 AUSTRALIAN SYNCHROTRON

3 IMBL BEAMLINE

4 SHUTTER CONTROLLER PROJECT DEVELOPMENT MECHANICAL SHUTTERS Jonathan Mckinlay SHUTTER CONTROLLER HARDWARE Adam Michalcyk SHUTTER CONTROLLER SOFTWARE Emmanuel Vettoor

5 SHUTTER1- MRT SHUTTER

6 SHUTTER 2-2A- SHUTTER

7 SHUTTER CONTROLLER HARDWARE PROCESSOR BASED DESIGN DACs TO CONTROL SOLENOID CURRENT TEMPERATURE SENSING SERIAL COMMUNICATION( UART,I2C)

8 PROCESSOR Atmega1280(8-bit) 128Kbytes of on-chip Flash 4K bytes EEPROM 8Kbytes of internal SRAM 2-8 bit Timers independent 4-16 bit Timers independent 2 Programmable Serial USART bit ADCs On-Chip Analog comparator SPI Interface I2C Interface

9 SERIAL DATA 5V- RS232 Line Driver/Receiver RS422/RS485 Transceiver

10 DAC 12 bit DACs Internal reference or External Reference I2C Interface 4 channels individually controlled Software or hardware controlled

11 REGULATORS

12 DIGITAL OUTPUT MOS FET Relays

13 PSS

14 SOLENOID DRIVERS

15 TEMPERATURE SENSING Precision Thermocouple Amplifiers Two modes, measurement and setpoint mode. Instrumentation amplifier fixed gain of 5mV/c. Buffer used to drive setpoint for low CMRR Can be used as ambient temperature sensor, short inputs(vou = Ta *5mv/c) Short out to sense for measurement mode Vout= Tmj*5mv/c + Vref.

16 LIMIT SWITCHES

17 LAYOUT

18

19 SHUTTER CONTROLLER SOFTWARE STATE MACHINE BASED UART INTERRUPTS, TIMER INTERRUPTS MONITORING INPUT PORTS CONTROLLING OUTPUT PORTS

20 SOFTWARE FUNCTIONALITY

21 PSS INTERFACE PSS heartbeat achieved using timer interrupts Photon Shutter Open sent after receiving Shutter Open Command or Exposure Start Command PSS enable checked during every state, if disabled go to resting state. Power Supply Enable checked indirectly, if disabled go to resting state.

22 SERIAL INTERFACE System should be able to receive and respond to commands 9600 BAUD Parity- Even Flow Control none Stop bits- 1 Command Format 1. Query Command - Two letter abbreviation followed by? e.g. EP? 2. Setup Command Two letter abbreviation followed by = and integer e.g. EP=1000

23 LIMIT SWITCH INTERFACE REQUIREMENTS Keep Track of the limit switch activation in the appropriate state. Keep count of errors and retain them in between power cycles. Keep count of first 10 cycles during which limit switch errors are encountered. Associated Commands OL?,CL?,RL?,EL?,CY? Accomplished by reading limit switch statuses in the appropriate state. Eg: In Open state bottom limit switch of coil2 and top limit switch of coil1 should be active. Write errors into on-chip EEPROM

24 TEMPERATURE REQUIRMENTS User should be able to set and monitor temperature levels of solenoid drivers. Designed warning and trip levels for temperature, set by the commands W1=integer, W2=integer,T1=integer,T2=integer. Timer interrupt used to shift between the temperature levels. Changed through DACs. Set appropriate flags to indicate warning, that can be queried through EPICS.

25 POWER DOWN REQUIREMENTS System should go to power down state once critical error happens In power down state, the system should respond to commands but should not act on commands. Remain in power down until EPICS powers up the system. Stop the heartbeat signal to PSS. Retain power down state during power cycle. Temperature flag is checked in every state. Coil power disabled. Command RS=1, re-enalbes the system from power down state.

26 EXPOSURE TIMING DIAGRAM

27 EXPOSURE REQUIREMENTS Jitter on exposure time shall not be more than.1ms for Exposure Cycles with short duration( order of few milliseconds) Jitter on exposure time shall not be more than 1% of Exposure Period for Exposure Cycles with long duration( order of seconds)

28 GENERAL CONTROLLABLE PARAMETERS FOR EXPOSURE Exposure Period (EP=integer)( MRT Software, 2A - Software) Cycle Period(CP=integer) ( MRT Software, 2A - Software) Activation Time for Coil1(A1=integer) ( MRT Software, 2A - Software) Activation Time for Coil2(A2=integer) (2A - Software) Activation Current for Coil1(V1=integer) (2A - Software) Activation Current for Coil2(V2=integer) (2A - Software) Holding Time for Coil1(OT=integer) (2A - Software) Holding Time for Coil1(CT=integer) (2A Software) Holding Current for Coil1(H1=integer) (2A - Software) Holding Current for Coil2(H2=integer) (2A - Software)

29 EXPOSURE TRIGGERING MECHANISMS FOR 2A SHUTTER Timer based Triggering Software Triggering, with command SE=1 Hardware Triggering

30 STATE MACHINE FLOW

31 STATE MACHINE FLOW FOR EXPOSURE

32 SOFTWARE TOOL CODEVISION AVR

33 SERIAL COMMAND HANDLING

34 CODE

35 COMMAND INTERPRETATION

36 STATES

37 STATE EXAMPLE

38 TIMING PERFORMANCE

39 BEAMLINE ARCHITECTURE

40 CRATE AND CABINET

41 ACKNOWLEDGMENTS Jonathan Mckinlay Adam Michalcyzk Daniel Hausermann Chris Hall Paul Martin Noel Basten