3211 sat 10 th november 2012
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3211 Sat 10 th November 2012. Summary. BPM normalisation error studies on INJ-BPM-01 : using different (rack room) cards. Swapping of H/V cables on INJ-BPM-01 few times within short time invervals . INJ-BPM-01 signals vs SOL-01 Record AR1 BPM signals to study frequency contents.

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3211 sat 10 th november 2012

3211 Sat 10th November 2012


Summary
Summary

  • BPM normalisation error studies on INJ-BPM-01 : using different (rack room) cards.

  • Swapping of H/V cables on INJ-BPM-01 few times within short time invervals.

  • INJ-BPM-01 signals vs SOL-01

  • Record AR1 BPM signals to study frequency contents.

  • INJ-BPM-03 signals simultaneously with INJ-FCUP and PI laser power trace.

  • Key finding: The 6 MHz seen in October ‘12 data is not present now.


Bpm normalisation error studies on inj bpm 01 using different rack room cards
BPM normalisation error studies on INJ-BPM-01 : using different (rack room) cards.

With the ‘normal’ rack room card (08) this is an example of what the x,y, charge signals look like

Note:-

Droop on x and charge

spikes on y


Bpm normalisation error studies on inj bpm 01 using different rack room cards1
BPM normalisation error studies on INJ-BPM-01 : using different (rack room) cards

  • Take fourier of the bunch train signals with initial transient (6.25 μs) and final droop (25 μs) removed => 70 μs section of the train

whole spectrum including aliasing, no 6 MHz evident

minimum frequency resolvable for 70 μs train is 1/70 μs = 15 kHz




Bpm normalisation error studies on inj bpm 01 card 08
BPM normalisation error studies on INJ-BPM-01 : CARD 08 different (rack room) cards

NB mistake here


Conclusions on inj bpm 01 vs bpm attentuation
Conclusions on INJ-BPM-01 vs. BPM different (rack room) cardsattentuation

  • The 300 kHz amplitude in the sum_voltage signal seems to depend on the BPM attenuation. Higher attenuation, lower amplitude.

  • Behaviour of other low frequency components not very clear.


Swap cables x y charge
Swap Cables – X, Y, CHARGE different (rack room) cards

attenuation = 15

attenuation = 18

reference

  • Switch cables for H pickups to V pickups; and vice versa.

swap cables

swap cables back


Swap cables fourier transforms
Swap Cables – different (rack room) cardsfourier transforms

attenuation = 15

attenuation = 18

reference

swap cables

swap cables back


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