0L04 Microphonics Test R100 in SL vs 0L04 slot 0L04 trip investigation

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Presentation transcript:

0L04 Microphonics Test R100 in SL vs 0L04 slot 0L04 trip investigation Stepper vs detuning He pressure ? 4 kHz instability vs control gain T. Plawski

R100/C100- SL tunnel ( 2011) Cavity # R100 rms detuning [Hz] C100 rms detuning [Hz] 1 1.9 1.6 2 NA 2.3 3 4.4 4 4.6 4.3 5 6.7 6 6.1 7 4.8 8

R100-SL (05/26/2011) Tone mode R100-Injector (10/17/2014) GDR mode

R100-Injector (10/17/2014) Signals from accelerometer Detuning 18°/div Forward power Typical detuning pattern ( every 10-20 minutes) frequency ( mechanical modes) 11/21 Hz detuning ~ 36 deg, forward power rises 50 %

R100-Injector (10/17/2014) Near trip event (1 hr - 3 hr) Signal from accelerometer Detuning 18°/div Forward power Near trip event (1 hr - 3 hr) frequency ( mechanical modes) 11/21 Hz detuning ~ 47 deg, forward power rises >100 %

R100-Injector (10/17/2014) Near trip event (1 hr - 3 hr) Signal from accelerometer Detuning 18°/div Forward power Near trip event (1 hr - 3 hr) frequency ( mechanical modes) 11/21 Hz detuning ~ 50 deg, forward power rises >130 %

R100-Injector (10/23/2014) Triggered on mechanical vibration Signal from accelerometer Detuning 18°/div Forward power Triggered on mechanical vibration Accelerometer installed on the top of stepper motor – cav 7

R100-Injector (10/24/2014) Triggered on forward power Signal from accelerometer Forward power Detuning 18°/div Triggered on forward power

R100-Injector (10/24/2014) Auto run Signal from accelerometer Forward power Detuning 18°/div

! rms detuning 5 deg ( 2.5 Hz) pk-pk detuning 31 deg (18 Hz) 0L04 cav7 – accelerometer He U-tube (10/31/2014) Detuning Forward power rms detuning 5 deg ( 2.5 Hz) pk-pk detuning 31 deg (18 Hz) !

Forward power vs He tube accelerometer) 0L04 cav7 – accelerometer He U-tube (10/31/2014) Signal from accelerometer Forward power Forward power vs He tube accelerometer)

R100-Injector (10/24/2014) Signal from accelerometer Detuning 18°/div Forward power 4 kHz instabilities ( mitigate by gain change/reduction)

Conclusions R100 in 0L04 slot acts similar to when in SL location I did not find any particular source of mechanical vibration Accelerometer measurements were not correlated with strong detuning events Helium supply line may required more investigation (accelerometer positioning) 4 kHz instability known from linac LLRF systems has been measured and alleviated ( later, same procedure has been applied for all C100 LLRF)