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19.06.2015Lutz Lilje DESY -MPY- XFEL Tuner Lorentz Force Detuning System Setup New Saclay design.

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Presentation on theme: "19.06.2015Lutz Lilje DESY -MPY- XFEL Tuner Lorentz Force Detuning System Setup New Saclay design."— Presentation transcript:

1 19.06.2015Lutz Lilje DESY -MPY- XFEL Tuner Lorentz Force Detuning System Setup New Saclay design

2 19.06.2015Lutz Lilje DESY -MPY- General Remarks Available today –Old Saclay Tuner –Simple Single Piezo fixture 150-200 Hz compensation Feedforward works well –Piezo stacks Desirable –Two piezo fixture Sensor-Actuator configuration –Future Option: Feedback on sensor piezo? –Bipolar operation to gain more stroke from Piezo At cold stroke of piezo is smaller by up to a factor of 10… … but the material is more forgiving –New Saclay Tuner

3 19.06.2015Lutz Lilje DESY -MPY- General remarks II Need engineering –Detailed study on forces at the piezo position Cold force sensor built by H1 Test in CHECHIA Design of fixture/frame for 2 piezos –Selection of best Piezo supplier Material INFN works on that –Control system Driver Amplifier modification for bipolar operation Need automated procedures to setup Piezo –Collaboration with INFN Detuning measurement –Preferably in one pulse –Warsaw colleagues are working on this

4 19.06.2015Lutz Lilje DESY -MPY- Lorentz Force Detuning System Setup Setup description Single pulse compensation Resonant excitation Problems

5 19.06.2015Lutz Lilje DESY -MPY- Lorentz Force Detuning System Setup Function Generator ADC PZD Amplifier Piezo actuator Piezo sensor PZM Amplifier DOOCS server Amplifier Lock-in or Logarithmic Chechia Matlab Fgen.m Matlab chread.m LP filter

6 19.06.2015Lutz Lilje DESY -MPY- Piezo Driver Amplifier (PZD) Specification: Gain of the unloaded amplifier: –38 V/V (  0.15), Output voltage range from -160.9 V to +70 V, (voltage limiter) Voltage offset: 0,11V Output voltage rise and fall time: 200  s (-160V  +60V) Maximal pulse current 2A (1ms) Capacitive load  1,5  F

7 19.06.2015Lutz Lilje DESY -MPY- Piezo Measurement Amplifier (PZM) Specification: Gain : 0.5 V/V, (adjustable), Bandwidth: 100kHz, Input impedance: 1k , Output voltage range: ±5V, Analog output 50 .

8 19.06.2015Lutz Lilje DESY -MPY- Piezoelectric tuner I M. Liepe, S. Simrock, W.D.-Moeller Piezo He-Tank & Cavity Tuning mechanism Piezo-Actuator: l=39mm U max =150V  l=3  m at 2K  f max,static =500Hz

9 19.06.2015Lutz Lilje DESY -MPY- Piezo Tuner setup II Sensor-Actuator configuration To compensate for Lorentz force detuning during the 1 ms RF pulse Feed-Forward To counteract mechanical noise, “microphonics” Feed-Back

10 19.06.2015Lutz Lilje DESY -MPY- Drawing of current setup (H.-B. Peters)

11 19.06.2015Lutz Lilje DESY -MPY- RF signals at 35 MV/m Blue: With piezo Red: Without piezo

12 19.06.2015Lutz Lilje DESY -MPY- Piezo excitation of the cavity for frequency compensation (operation for 700 hours) RF pulse (500us fill, 800us flat-top)

13 19.06.2015Lutz Lilje DESY -MPY- Single pulse compensation Pulse Parameters: frequency = 219 Hz time delay = 0.84 ms amplitude = 95V

14 19.06.2015Lutz Lilje DESY -MPY- Single pulse compensation MICROPHONICS

15 19.06.2015Lutz Lilje DESY -MPY- Damping of the ringing between pulses (5Hz operation) RF pulse

16 19.06.2015Lutz Lilje DESY -MPY- Frequency stabilization during RF pulse using a piezoelectric tuner Blue: With piezo Red: Without piezo Frequency detuning of 500 Hz compensated voltage pulse (~100 V) on the piezo. No resonant compensation

17 19.06.2015Lutz Lilje DESY -MPY- Option: Resonant excitation of a mechanical cavity resonance if one excites a mechanical resonance of a cavity with the piezo, one can use the cavity as an mechanical amplifier, so that a small stroke of the active element can compensate large detuning we have shown that with the excitation of three periods of the mechanical resonance frequency, about 1000 Hz could be compensated

18 19.06.2015Lutz Lilje DESY -MPY- Resonant excitation (stable for 200 hours) Pulse Parameters: frequency = 219 Hz time shift = -9.5 ms amplitude = 24V offset = 24V

19 19.06.2015Lutz Lilje DESY -MPY- Resonant excitation

20 19.06.2015Lutz Lilje DESY -MPY- Frequency stabilization at 35 MV/m Blue: With piezo Red: Without piezo Frequency detuning of ~1000 Hz compensated with resonant excitation of a mechanical cavity resonance at 230 Hz. NOTE: This is rather an demonstration of the capability of active tuning. Application in a real machine is probably difficult/ impossible. Needs investigation.

21 19.06.2015Lutz Lilje DESY -MPY- Module Measurements

22 19.06.2015Lutz Lilje DESY -MPY- Single Piezo - Single Pulse Compensation inside the module  f=200Hz, only 100Hz compensation

23 19.06.2015Lutz Lilje DESY -MPY- Single Piezo - Resonant

24 19.06.2015Lutz Lilje DESY -MPY- Problems with the active tuner Fundamental problem: –Preload at operating temperature not defined –Large tuning needed for both cavities tested in CHECHIA (AC72, AC73) ´natural´ frequency after tank welding is 780 kHz above 1,3 GHz Normally this is more like 200-300 kHz –This results in a very large force tearing on the piezo fixture Fixtures open up and piezos become loose

25 19.06.2015Lutz Lilje DESY -MPY- Force Measurement at the Piezo Position Design by Karsten Gadow (H1) –Available within 2-3 weeks Detailed measurement of the force in the cold environment –Calibration will be first done to liquid nitrogen temperatures Then design a fixture with sufficient stiffness

26 19.06.2015Lutz Lilje DESY -MPY- Problems with active tuning Single Piezo fixture –So far only 100-200 Hz compensated (no resonant excitation of the cavity) –Achieved compensation at 1,3 GHz –Alternative: Resonant mechanical excitation of the cavity Double Piezo fixture –Has only been operated at 1,3 GHz + 600kHz –Needs a stiffer design –Alternative: Put 2 single Piezo fixtures at different posts of the tuner Bipolar operation of Piezos helps in any case –Check in CHECHIA and INFN

27 19.06.2015Lutz Lilje DESY -MPY- Fixture Twist Problem  Fixture twists during operation

28 19.06.2015Lutz Lilje DESY -MPY- Problems with active tuning Automation is needed for operation of the piezos in the machine –Determination of optimum pulse shape –Interconnection to LLRF system

29 19.06.2015Lutz Lilje DESY -MPY- Available piezos (1/2) EPCOS NOLIAC Piezo Mechanik Physical Instruments

30 19.06.2015Lutz Lilje DESY -MPY- Available piezos (2/2) Mechanical Electrical

31 19.06.2015Lutz Lilje DESY -MPY- New Saclay Tuner Design by P. Bosland More compact design possible Cavity should be pre-tuned so that the tuner is not pushing Piezo integrated Available by the end of the year for first tests

32 19.06.2015Lutz Lilje DESY -MPY- New Saclay Tuner 2

33 19.06.2015Lutz Lilje DESY -MPY- New Saclay Tuner 3

34 19.06.2015Lutz Lilje DESY -MPY- New Saclay Tuner 4

35 19.06.2015Lutz Lilje DESY -MPY- Conclusion Proof-of-principle –Single-piezo »Non-resonant:100Hz in the module »Resonant: 200 Hz in the module »(We can use this in module 6!) –Double-piezo »Non-resonant: 400 Hz (not at 1.3GHz exact) »Resonant: 1kHz –Test of bipolar operation Engeneering is needed –Choice of Piezo (-> together with INFN, IPN Orsay)) –Stiffer Piezo fixture/frame for 2 Piezos »Force measurement is underway (finished end 2004?) –LLRF integration New Saclay tuner tests needed –Available end 2004 / beginning 2005 –Change of cavity pre-tuning desirable

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