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3211 Sat 10 th November 2012

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

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  1. 3211 Sat 10th November 2012

  2. 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.

  3. 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

  4. 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

  5. BPM normalisation error studies on INJ-BPM-01 : CARD 06

  6. BPM normalisation error studies on INJ-BPM-01 : CARD 04

  7. BPM normalisation error studies on INJ-BPM-01 : CARD 08 NB mistake here

  8. Conclusions on INJ-BPM-01 vs. BPM attentuation • 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.

  9. Swap Cables – X, Y, CHARGE attenuation = 15 attenuation = 18 reference • Switch cables for H pickups to V pickups; and vice versa. swap cables swap cables back

  10. Swap Cables – fourier transforms attenuation = 15 attenuation = 18 reference swap cables swap cables back

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