1 / 2

Feedback questions / action-items

Feedback questions / action-items. How do the beam-based feedback systems deal with exceptions? (Difficult problems) Startup, beam loss, MPS trip, etc – not cost/RDR issue Detecting and handing bad sensors or actuators (bpms, etc) – need redundancy – cost for RDR.

helmut
Download Presentation

Feedback questions / action-items

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Feedback questions / action-items • How do the beam-based feedback systems deal with exceptions? (Difficult problems) • Startup, beam loss, MPS trip, etc – not cost/RDR issue • Detecting and handing bad sensors or actuators (bpms, etc) – need redundancy – cost for RDR. • Need to include RTML simulations in linac simulations. • Interplay between the various feedbacks and feed-forwards? • How does feedback help the rf specs? [LLRF folks! Sergei] • Understand noise spectrum from rf systems • Understand which parameters beam-based feedback can be fixed and by how much. • How many intra-train feedbacks do we have, and how many pulses do they collectively take to converge? BCD doesn’t have a definitive list of intra-train feedbacks. [JC + PB to check • Relative timing of two linacs (could change within train) • What is the beam stability requirement in the damping ring and turn-around? Spec is driven by BDS requirements. Falls on accelerator physics groups. Assume we need orbit feedback and transverse and longitudinal multi-bunch feedback. • Should feedback be a bunch of individual loops or a global system (trajectory control)? • How does the system deal with error propagation? • What level of adaptation is required for transfer matrices (how stable are the optics, energy profile)? • We need bunch by bunch information from the lumi monitor in real time [detector folks]

  2. Feedback questions / action-items 2 • What does it take for the feedback systems to work for single-bunch low current, etc to study luminosity effects and feedback performance? • Need to develop cavity bpm systems that provide bunch-by-bunch information with appropriate performance. • 5Hz feedback requirements of control system: • Flexible synchronous networking so that network does not take substantial fraction of the 200ms. • “Everything” (potential sensors, actuators) should be potentially available to 5Hz feedback systems. Has implications on controls interfaces and on design of the devices themselves. Should develop a list of things that we might want to operate at 5Hz, how fast and how much we want them to move in 200ms. [warm correctors in linac??] Issue of dynamic field response of dipole magnets?? Persistent currents… • Be able to plug in feedback loop where-ever, when-ever… • Is the phase stability of the crab-cavities an issue for this group? LLRF – yes! • DR feedback item: circumference feedback (chicane) • Positron feedback item: circumference/path-length control

More Related