Temperature Control Requirements at VUV-FEL

Transcription

1 Temperature Control Requirements at VUV-FEL Olaf Krebs April 2004 Water-Cooling-Workshop at DESY 1

2 Some words about: automation and control at MKK Automate MKK Plants on base of programmable logic controller PLC April 2004 Water-Cooling-Workshop at DESY 2

3 Some words about: automation and control at MKK Network MKK Plants Industrial Ethernet, Profibus FMS, DP, patch fields April 2004 Water-Cooling-Workshop at DESY 3

4 Some words about: automation and control at MKK Connect MKK Plants to Control System use EPICS like a SCADA system April 2004 Water-Cooling-Workshop at DESY 4

5 Temperature Control Requirements at VUV-FEL Higher requirements to water temperature at TTF High stability of temperature at TDC (LOLA) High stability of temperature at Gun Temperature Control with PLC (Programmable logic controller) and software controller Sensor, Actuator, PLC - standard industrial components Design of controller Modular PID control software Experiences with Pitz Gun water cooling Conclusions April 2004 Water-Cooling-Workshop at DESY 5

6 Control of water temperature at VUV-FEL High stability of temperature at TDC (LOLA) Built in beam line of TTF, new part of the tunel e σ z S-band 3.66 m V(t) transverse RF deflector β c RF streak ψ y Transverse Deflecting Cavity Method for measuring bunch length β p σ y April 2004 Water-Cooling-Workshop at DESY 6

7 Control of water temperature at VUV-FEL High stability of temperature in the Gun of TTF Temperature distribution Gun built in TTF RF-Gun consists of April 2004 Water-Cooling-Workshop at DESY 7

8 Control of water temperature at VUV-FEL Temperature scan RF Gun water temperature vs reflect Power minimum of reflected power at a special value of water temperature April 2004 Water-Cooling-Workshop at DESY 8

9 Temperature Control by PLC and Software Hardware, Sensor, Actuator Manipulated value Cold water Hot water Setpoint Control algorithm Process variable April 2004 Water-Cooling-Workshop at DESY 9

10 Temperature Control by PLC and Software Block diagram of control loop response characteristic RF-energy mode conditioning Beam operation Setpoint - Process variable April 2004 Water-Cooling-Workshop at DESY 10

11 response characteristic Valve Datasheet Control signal ma or V resolution M2H..FYN > 1000 SKD62 ~ 100 positioning time M2H..FYN < 1s SKD62 open 15s close 30s M2H..FYN Magnetic actuator SKD62 Electro hydraulic Ideal real t April 2004 Water-Cooling-Workshop at DESY 11

12 response characteristic Valve, Drive Actuator with different resolution, Simulation Resolution(1)=x Resolution(2)=2*x April 2004 Water-Cooling-Workshop at DESY 12

13 response characteristic Immersion temperature sensor Facing a choice Measuring element (platinium, nickel), PT 100 Ni1000 Temperature range Class of qulaity Class A ± (0,15 + 0,002 ItI) Class B ± (0,3 + 0,005 ItI) 1/10 A 1/3 B Connection to PLC Input has support sensor type Two wire, four wire Response time( (0.632* value time) Fast 2~3 s Different in combination with immersion pocket t April 2004 Water-Cooling-Workshop at DESY 13

14 response characteristic Immersion temperature sensor 3 PT100 with different response time T Load =50s T Sen1 =15s T Sen2 =10s T Sen3 =5s April 2004 Water-Cooling-Workshop at DESY 14

15 Controller PLC Input Measuring element: PT100 -> Input for this signal Resolution -> 16 Bit (incl. sign) 0.01 K/bit Conversion time different methods April 2004 Water-Cooling-Workshop at DESY 15

16 Controller PLC Output Control signal 0-10 V, 4 20 ma, other Resolution > resolution of Actuator ~ 12 bit CPU Selection conditions Number and type of tasks Number and type of in/outputs Communication with control systems Software requirements Memory size Performance, scan time of control task 0.1 of the main response time Floating-point operation April 2004 Water-Cooling-Workshop at DESY 16

17 Control algorithm PLC Software: modular PID control PID Controller used in many control tasks Continuous PID controllers PID step controllers for integrating actuators Pulse-break controllers Software library to create different types of controller Fixed set point controllers Cascade controllers Ratio controllers Split range controllers Override controllers Controllers with feed forward control Multiple variable controllers April 2004 Water-Cooling-Workshop at DESY 17

18 Control algorithm PLC Software Function blocks for Set point generator Input output adapter Signal processing Set point Generator PID - algorithm Output Adapter Input Adapter April 2004 Water-Cooling-Workshop at DESY 18

19 Experience: Pitz Gun water- cooling GUI of Pitz Control System April 2004 Water-Cooling-Workshop at DESY 19

20 Pitz Gun control loop overview Parameter coming from DOOCS Slope Valve Power PLC April 2004 Water-Cooling-Workshop at DESY 20

21 Pitz Gun control loop Gun Iris Temperature Temperature drop Valve position RF-power Temperature of gun flow RF-pulse length April 2004 Water-Cooling-Workshop at DESY 21

22 Conclusion to achieve a precise temperature control The cooling plant has to be well designed Knowledge of the load, power constant or dynamic, response time Sensor Resolution and response time Correct locationto avoid parasitic drags Actuator Resolution and response time Correct location, near the load -> less delay time PLC Modular control software Useful for different tasks April 2004 Water-Cooling-Workshop at DESY 22

23 References J.-P. Carneiro: Behavior of the TTF2 RF Gun with long pulses and high repetition rates April 2004 Water-Cooling-Workshop at DESY 23