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ADT What could be delivered Plans for LS1 and beyond

ADT What could be delivered Plans for LS1 and beyond. F. Dubouchet W. Höfle G. Kotzian D. Valuch Special thanks to: A. Boucherie , A. Butterworth, S. Calvo , G. Cipolla , D. Jacquet , M. Jaussi , C. Julie, N. Jurado , F. Killing, E. Montesinos , C. Renaud.

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ADT What could be delivered Plans for LS1 and beyond

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  1. ADT • What could be delivered • Plans for LS1 and beyond F. Dubouchet W. Höfle G. Kotzian D. Valuch Special thanks to: • A. Boucherie, A. Butterworth, S. Calvo , G. Cipolla, D. Jacquet, M. Jaussi, C. Julie, N. Jurado, F. Killing, E. Montesinos, C. Renaud

  2. The transverse damper system • Operation in 2012 was very smooth, routinely switching between different modes and operating the feedback during the entire LHC cycle. • Several MDs • ADT vs. BBQ cohabitation • Noise vs. emittance conservation • Fast controlled losses • Increased bandwidth operation • New features • Selective blow-up • Tune observation “infrastructure” • High bandwidth Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

  3. ADT now • Two pickups per beam per plane • Gain modulation within the turn • Cleaning • Same analogue gain and bandwidth for all bunches and cleaning • ADT/BBQ cohabitation Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

  4. ADT now • Pilot not visible in standard operation • Injection oscillations on fixed display • Sequential observation of selected bunches up to 256k points • Multiturn application, offline analysis • Post mortem data Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

  5. Tune measurement tests • ADT vs. BBQ cohabitation • Several tests and operational developments done on tune extraction from ADT • Witness bunch method: active kicking by 10’s mm • Extraction of tune from the residual noise • Passive observation of bunches with lowered gain • F. Dubouchet: Betatrontune measurement with the LHC damper using a GPU Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

  6. Tune measurement tests Tune measurement with active kicking of the first 6 (witness) bunches with full ADT gain. Horizontal plane, Beam 1, 12.8.2012. Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

  7. Cleaning High gain: tune can be extracted from the residual noise Injection Prepare ramp Passive observation of the first 6 bunches with reduced gain. Hor. B2 Ramp Low gain: tune can be extracted from the peak in damper BPM spectrum “What you get” Transverse damper system, Evian 2012

  8. High bandwidth (commissioned in 2012) • Power amplifiers, 1st order low pass, -3 dB @ 1 MHz • Power amplifier phase response compensated by digital filter Frequency domain measurements February 2012 B. Lojko. Step response measurements 19.9.2012 D.Valuch, G.Kotzian kick @ 10 MHz, Only 10% strength left

  9. High bandwidth (commissioned in 2012) • Measured enhanced frequency response reaches beyond 20 MHz  Bunch by bunch damper • Enhanced bandwidth provides faster damping of high frequency modes • “Ideal damper” – treats each bunch individually • Drawback – increase of noise injected through the damper, mitigations for noise reduction foreseen for after LS1

  10. ADT post-LS1 • Major upgrade of electronics to house all new features accumulated since 2009 • Double the number of pickups, new upgraded beam position modules • Multiple output DACs: • Independent treatment of different bunch groups (high/low gain, high/low bandwidth) • Independent cleaning performance Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

  11. ADT post-LS1, new features* • Bunch by bunch instability trigger in the FPGA • Anything visible by the ADT could trigger • What should be sent to a fixed display? • Independent observation box, tune diagnostic box • All bunches at full rate, not perturbing the ADT operation • Advanced real time analysis • Save the fill data (ca. 1TB/hour/ring) * Certain features may be available only if sufficient resources are found Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

  12. New pickups (standard optics) Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

  13. Plans for the LS1 • Tune extraction • Decide on optimum after careful analysis of collected data and requirements collected from the BE/OP and BE/ABP/ICE • Witness bunches proved very promising, can we have a decision to keep them? • The independent external tune diagnostic box can do an advanced processing in real time of the bunch by bunch data • Instability detection, any activity which is visible by ADT could be detected (bunch by bunch) Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

  14. Summary • ADT operation in 2012 was very smooth, routinely switching between different modes and operating the feedback during the entire LHC cycle • 2012 was devoted mainly to development of new features, modes of operation, studies and MDs • Additional pickups, large recabling campaign during LS1 • New beam position and signal processing electronics Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

  15. Summary • New electronics allows to implement certain features like instability trigger into the ADT • Larger observation memories 256k  1-4Mpoints • External observation boxes • Tune measurement • Instability observation and analysis (those visible by ADT) • Allows heavy traffic without disturbing the system • We do our best, but “bunch-by-bunch everything” is not a specification that we can base a design on • A lot of work ahead – the design specs need to be frozen by May 2013! Review on 'Functional Requirements on LHC Transverse Instability Diagnostics after LS1‘. 15/3/2013

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