Plan for 500 GeV Development Vadim, Mei. Goals 1.Explore polarization transmission to the 500 Gev CM energy. 2. Inspect the luminosity aspects (with 2.

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Presentation transcript:

Plan for 500 GeV Development Vadim, Mei

Goals 1.Explore polarization transmission to the 500 Gev CM energy. 2. Inspect the luminosity aspects (with 2 collisions): store lifetime, total intensity limits.

Machine configuration  Beta* (IP6,IP8): 2m  No crossing angles  Standard tune swing at 100Gev: (.72;.73) -> (0.69, 0.68)  No rotators

Plan (1) Day 1: –Ramp development with 6 bunches(3 shifts) Tune/decoupling feedback application Orbit correction below 0.5mm Machine protection at higher energies ( several quenches during 205Gev development last year) Day 2: –Finishing ramp development with 6 bunches (1 shift) –56 bunch development ( 2 shifts) Ramp improvement to deliver higher intensities Polarization measurements at the store. Store development and collision steering.

Plan (2) Day 3-4: –Polarization transmission development (2 shifts) 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) 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) 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.

Plan (3) Day 4-5: –Beam-beam limit (1 shift): 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): Goal: to check for possible total intensity limits 56 (110 bunch) acceleration with high bunch intensities (>1e11 p/bunch) –Stores (~4h) 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?)

Run layout Ramp and polarization development: 8 shifts Dedicated polarization studies: 3 shifts Dedicated luminosity studies: 4 shifts Contingency shifts: 3 shifts Total:18 shifts or 6 days