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  • Setup Beam Studies Summary

    Bunch-by-bunch Feedback at the MLS Updates and Beam Studies

    F. Falkenstern1, J. Feikes1, M. Ries1, A. Shaelicke1, D. Teytelman2, et. al.

    1HZB, Berlin, Germany 2Dimtel, Inc., San Jose, CA, USA

    February 13, 2014

  • Setup Beam Studies Summary

    Outline

    1 Setup System Updates

    2 Beam Studies Beam Transfer Function Bunch Cleaning Longitudinal Feedback on The Ramp Longitudinal Grow/Damp Measurements Post-mortem Data

  • Setup Beam Studies Summary

    Work Summary

    Updated all 4 iGp12 units to a new gateware/software release:

    Feedback filter lengthened from 16 to 24 taps; BRAM acquisition memory increased from 192k to 324k; Single-bunch acquisition engine added, BTF functionality; Trigger capture, polarity; Front-end phase tracking; Time-domain modulation of drive signal.

    Performed timing offset calibrations, should simplify future updates; Found front/back-end DAC unresponsive (controls phase shifters, fan speed). Need to replace GPIO cable, will provide a standard short cable.

  • Setup Beam Studies Summary

    What Was Done When

    Day by Day January 8 Calibration of Y and SPARE units, a bit of tuning in

    the longitudinal plane, some testing with beam, BESSY II work.

    January 9 Updated and calibrated Z unit, timed and phased longitudinal and horizontal, optimized bunch-to-bunch isolation, demonstrated bunch cleaning, single bunch transfer function.

    January 10 Timed and phased vertical plane, set up post-mortem diagnostics, Z feedback on the ramp, growth rate studies, 10 ps optics.

  • Setup Beam Studies Summary

    Outline

    1 Setup System Updates

    2 Beam Studies Beam Transfer Function Bunch Cleaning Longitudinal Feedback on The Ramp Longitudinal Grow/Damp Measurements Post-mortem Data

  • Setup Beam Studies Summary

    Longitudinal Beam Transfer Function

    85 90 95 100 105 110 115 120 125 130 −70

    −60

    −50

    −40

    −30

    −20

    −10

    Frequency (kHz)

    M ag

    ni tu

    de (

    dB )

    Peak −16.2 dB at 105.4 kHz

    85 90 95 100 105 110 115 120 125 130 −50

    0

    50

    100

    150

    200

    250

    Frequency (kHz)

    P ha

    se (

    de g)

    Center phase 90.0 deg @ 105.3 kHz

    Open-loop BTF; Shift gain of 0; Shift gain of 1; Shift gain of 2; Shift gain of 3; Shift gain of 4; Shift gain of 5; Shift gain of 6; BTF peak vs. feedback gain.

  • Setup Beam Studies Summary

    Longitudinal Beam Transfer Function

    85 90 95 100 105 110 115 120 125 130 −70

    −60

    −50

    −40

    −30

    −20

    −10

    Frequency (kHz)

    M ag

    ni tu

    de (

    dB )

    Peak −25.1 dB at 105.2 kHz

    85 90 95 100 105 110 115 120 125 130 −50

    0

    50

    100

    150

    200

    250

    Frequency (kHz)

    P ha

    se (

    de g)

    Center phase 89.7 deg @ 105.3 kHz

    Open-loop BTF; Shift gain of 0; Shift gain of 1; Shift gain of 2; Shift gain of 3; Shift gain of 4; Shift gain of 5; Shift gain of 6; BTF peak vs. feedback gain.

  • Setup Beam Studies Summary

    Longitudinal Beam Transfer Function

    85 90 95 100 105 110 115 120 125 130 −70

    −60

    −50

    −40

    −30

    −20

    −10

    Frequency (kHz)

    M ag

    ni tu

    de (

    dB )

    Peak −29.7 dB at 105.2 kHz

    85 90 95 100 105 110 115 120 125 130 −50

    0

    50

    100

    150

    200

    250

    Frequency (kHz)

    P ha

    se (

    de g)

    Center phase 92.0 deg @ 105.3 kHz

    Open-loop BTF; Shift gain of 0; Shift gain of 1; Shift gain of 2; Shift gain of 3; Shift gain of 4; Shift gain of 5; Shift gain of 6; BTF peak vs. feedback gain.

  • Setup Beam Studies Summary

    Longitudinal Beam Transfer Function

    85 90 95 100 105 110 115 120 125 130 −70

    −60

    −50

    −40

    −30

    −20

    −10

    Frequency (kHz)

    M ag

    ni tu

    de (

    dB )

    Peak −34.8 dB at 105.6 kHz

    85 90 95 100 105 110 115 120 125 130 −50

    0

    50

    100

    150

    200

    250

    Frequency (kHz)

    P ha

    se (

    de g)

    Center phase 89.7 deg @ 105.3 kHz

    Open-loop BTF; Shift gain of 0; Shift gain of 1; Shift gain of 2; Shift gain of 3; Shift gain of 4; Shift gain of 5; Shift gain of 6; BTF peak vs. feedback gain.

  • Setup Beam Studies Summary

    Longitudinal Beam Transfer Function

    85 90 95 100 105 110 115 120 125 130 −70

    −60

    −50

    −40

    −30

    −20

    −10

    Frequency (kHz)

    M ag

    ni tu

    de (

    dB )

    Peak −40.6 dB at 104.8 kHz

    85 90 95 100 105 110 115 120 125 130 −50

    0

    50

    100

    150

    200

    250

    Frequency (kHz)

    P ha

    se (

    de g)

    Center phase 88.4 deg @ 105.5 kHz

    Open-loop BTF; Shift gain of 0; Shift gain of 1; Shift gain of 2; Shift gain of 3; Shift gain of 4; Shift gain of 5; Shift gain of 6; BTF peak vs. feedback gain.

  • Setup Beam Studies Summary

    Longitudinal Beam Transfer Function

    85 90 95 100 105 110 115 120 125 130 −70

    −60

    −50

    −40

    −30

    −20

    −10

    Frequency (kHz)

    M ag

    ni tu

    de (

    dB )

    Peak −46.4 dB at 106.7 kHz

    85 90 95 100 105 110 115 120 125 130 −50

    0

    50

    100

    150

    200

    250

    Frequency (kHz)

    P ha

    se (

    de g)

    Center phase 89.1 deg @ 105.4 kHz

    Open-loop BTF; Shift gain of 0; Shift gain of 1; Shift gain of 2; Shift gain of 3; Shift gain of 4; Shift gain of 5; Shift gain of 6; BTF peak vs. feedback gain.

  • Setup Beam Studies Summary

    Longitudinal Beam Transfer Function

    85 90 95 100 105 110 115 120 125 130 −70

    −60

    −50

    −40

    −30

    −20

    −10

    Frequency (kHz)

    M ag

    ni tu

    de (

    dB )

    Peak −51.1 dB at 107.1 kHz

    85 90 95 100 105 110 115 120 125 130 −50

    0

    50

    100

    150

    200

    250

    Frequency (kHz)

    P ha

    se (

    de g)

    Center phase 86.0 deg @ 105.7 kHz

    Open-loop BTF; Shift gain of 0; Shift gain of 1; Shift gain of 2; Shift gain of 3; Shift gain of 4; Shift gain of 5; Shift gain of 6; BTF peak vs. feedback gain.

  • Setup Beam Studies Summary

    Longitudinal Beam Transfer Function

    85 90 95 100 105 110 115 120 125 130 −70

    −60

    −50

    −40

    −30

    −20

    −10

    Frequency (kHz)

    M ag

    ni tu

    de (

    dB )

    Peak −54.5 dB at 86.9 kHz

    85 90 95 100 105 110 115 120 125 130 −50

    0

    50

    100

    150

    200

    250

    Frequency (kHz)

    P ha

    se (

    de g)

    Center phase 86.0 deg @ 105.6 kHz

    Open-loop BTF; Shift gain of 0; Shift gain of 1; Shift gain of 2; Shift gain of 3; Shift gain of 4; Shift gain of 5; Shift gain of 6; BTF peak vs. feedback gain.

  • Setup Beam Studies Summary

    Longitudinal Beam Transfer Function

    −45 −40 −35 −30 −25 −20 −15 −10 −5 0 −60

    −55

    −50

    −45

    −40

    −35

    −30

    −25

    −20

    −15

    Feedback attenuation (dB)

    B T

    F p

    ea k

    (d B

    )

    Measured Estimated

    Open-loop BTF; Shift gain of 0; Shift gain of 1; Shift gain of 2; Shift gain of 3; Shift gain of 4; Shift gain of 5; Shift gain of 6; BTF peak vs. feedback gain.

  • Setup Beam Studies Summary

    Outline

    1 Setup System Updates

    2 Beam Studies Beam Transfer Function Bunch Cleaning Longitudinal Feedback on The Ramp Longitudinal Grow/Damp Measurements Post-mortem Data

  • Setup Beam Studies Summary

    Bunch Cleaning, Vertical Plane

    After re-tuning checked bunch cleaning at injection and at the top of the ramp; With the back-end optimized see good isolation bunch-to-bunch; Spelling MLS in Morse code here.

  • Setup Beam Studies Summary

    Bunch Cleaning, Vertical Plane

    After re-tuning checked bunch cleaning at injection and at the top of the ramp; With the back-end optimized see good isolation bunch-to-bunch; Spelling MLS in Morse code here.

  • Setup Beam Studies Summary

    Bunch Cleaning, Vertical Plane

    After re-tuning checked bunch cleaning at injection and at the top of the ramp; With the back-end optimized see good isolation bunch-to-bunch; Spelling MLS in Morse code here.

  • Setup Beam Studies Summary

    Bunch Cleaning, Vertical Plane

    15 20 25 30 35 40 45 50 55 0

    50

    100

    150

    200

    250

    300

    Bunch number

    B un

    ch c

    ur re

    nt (

    ar b.

    u ni

    ts )

    After re-tuning checked bunch cleaning at injection and at the top of the ramp; With the back-

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