1 / 8

Plan for 500 GeV Development

Plan for 500 GeV Development. Vadim, Mei. Goals. Explore polarization transmission to the 500 Gev CM energy. 2. Inspect the luminosity aspects (with 2 collisions): store lifetime, total intensity limits. Machine configuration.

brittneyt
Download Presentation

Plan for 500 GeV Development

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. Plan for 500 GeV Development Vadim, Mei

  2. Goals • Explore polarization transmission to the 500 Gev CM energy. 2. Inspect the luminosity aspects (with 2 collisions): store lifetime, total intensity limits.

  3. Machine configuration • Beta* (IP6,IP8): 1.5m (down from initial 2m because of power supply limitations) • No crossing angles • Standard tune swing at 100Gev: (.72;.73) -> (0.69, 0.68) • No rotators

  4. Plan (1) • Power supply preparation work (~2 shifts).Jun.20-21 • Ramp development with 6 bunches(3 shifts)Jun.21-22 • Tune/decoupling feedback application • Orbit correction below 0.5mm • Machine protection at higher energies ( several quenches during 205Gev development last year) • Finishing ramp development with 6 bunches (1 shift) Jun.22 • 56 bunch development ( 2 shifts) Jun.22-23 • Ramp improvement to deliver higher intensities • Polarization measurements at the store. • Store development and collision steering.

  5. Plan (2) • Polarization transmission development (2 shifts) Jun.23 Goal: to maximize injection-to-store polarization transmission. • If the polarization loss is obvious: • polarization ramp measurement • tune/orbit corrections at the position of polarization loss. • Polarization profile measurements at injection and store in both planes. • Polarization setup at store (1 shift) Jun.24 Goal: to measure the width of depolarizing resonances at the store • Tune scans at store both Qx and Qy around 0.7. One at a time • Profile measurements at store in both planes • Polarization studies on the ramp (2 shifts) Jun.24 Goal: to evaluate the tolerances for orbit and betatron tunes on the ramp • Polarization ramp measurement • Systematic measurement as function of closed orbit distortion at one of three major resonances above 100 GeV • Systematic measurement as a function of tunes at the resonances.

  6. Plan (3) • Beam-beam limit (1 shift) Jun.25 Goal: to compare beam-beam limits at 100 and 250Gev • Collisions with bunch intensities achieved during 100Gev run (6 bunch ramp) (1 shift) • Total intensity limit (1 shift).Jun.25 Goal: to check for possible total intensity limits • 56 (110 bunch) acceleration with high bunch intensities (>1e11 p/bunch) • Stores (~4h each) Jun.25-26 Goal: to evaluate beam lifetime and polarization lifetime (2 shifts) • Varying the (vertical) tune distance from 0.7 from store to store • Can be used by the experiments. ( Local polarimeters?)

  7. Run layout • Power supply preparations: 2 shifts • Ramp and polarization development: 8 shifts • Dedicated polarization studies: 3 shifts • Dedicated luminosity studies: 4 shifts • Contingency shifts: 2.5 shifts • Total required: 19.5 shifts or ( 6 days +1.5 shifts) • Available: 16.5 shifts or ( 5 days + 1.5 shifts)

  8. Run layout (updated) • Power supply preparations: 2 shifts • Ramp and polarization development: 8 shifts • Dedicated polarization studies: 2 shifts • Dedicated luminosity studies: 2 shifts • Contingency shifts: 2.5 shifts • Total required: 16.5 shifts or ( 6 days +1.5 shifts) Beam-beam studies, total intensity limit studies and 1 shift of polarization on ramp studies will be only possible using contingency shifts.

More Related