1 / 8

Low emittance tuning report

This report discusses the persistent issues with running Merlin on PC, the attempts made with expert assistance, and the exploration of alternative programs such as MAD and LEGO for benchmarking. It also outlines the strategy for orbit, dispersion, and coupling correction, as well as the sensitivity studies and tolerance determination.

christinaw
Download Presentation

Low emittance tuning report

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. Low emittance tuning report M. Biagini, Y. Cai, M. Donald, J. Yocky (with help from W. Wittmer and A. Wolski)

  2. Merlin • The problem with Merlin on PC persists • Several attempts have been made, with the help of WW we also contacted an expert in LBL, we are waiting for feedback • Andy just sent me few hints on library management, will see if this help • MHD installed Merlin on Linux and is ready to go ? • I will continue trying on my PC or will install it on Unix in Frascati • We have a Task Force now !

  3. Alternatives • We decided to proceed with other programs. In any case we should do this for benchmarking Merlin, so it is not a lost of time • There are basically 2 alternatives: MAD and LEGO • JY will take care of starting the setup of MAD • YC (Yuri ?) will start with implementation of tuning in LEGO • This work has a first deadline on April 23-24 for the Mini-MAC

  4. MAD • For MAD we need to construct the Orbit and Coupling Response Matrix in oder to be able to do the correction of orbit, dispersion and coupling. The best correction would need SVD routine • A new MAD file for LER has been provided by MB, containing the lastest IR from MS, with by* of 0.22 mm, and BPMs and correctors near to each quadrupole (IR included) • The IR quads and sexts have been labelled with a “IR_” flag, so it is possible to exclude them from the procedure at the beginning

  5. LEGO • Same file has been handed to YC • Don’t know details on how LEGO will treat this

  6. Strategy • Start with a table of errors (needs to be the same for all programs) • Generate random and systematic alignment errors on: • Quadrupoles • Sextupoles • BPMs (offset) • Proceed to orbit, dispersion and coupling correction for a large number of seeds (10000 ?) • Compute vertical emittance after correction for each seed

  7. Strategy (cont) • Study the sensitivity to these errors • How to get rid of unwanted large emittance cases (the long tails...) ? • Study IR sensitivity separately (will have to start stabilizations studies as for ILC) and produce a separate table of tolerances • Decide on correctors configuration (I still would prefer not to have one to one with quads!) • Build a table of tolerances (this is the main goal) • What else?

  8. We will need to report on progresses preferably at the Wednesday weekly meetings • If we can have at least a start for the Paris meeting (Feb. 15th) it would be very nice!!!!

More Related