3211 sat 10 th november 2012
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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3211 Sat 10th November 2012
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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.
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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 chargespikes on y
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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
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BPM normalisation error studies on INJ-BPM-01 : CARD 06
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BPM normalisation error studies on INJ-BPM-01 : CARD 04
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BPM normalisation error studies on INJ-BPM-01 : CARD 08
NB mistake here
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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.
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Swap Cables – X, Y, CHARGE • Switch cables for H pickups to V pickups; and vice versa.
attenuation = 15 attenuation = 18reference
swap cables
swap cables back
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Swap Cables – fourier transforms
attenuation = 15 attenuation = 18reference
swap cables
swap cables back