So many simulations, so few (understood) results Code Edited From Jochem Snuverink Ryan Bodenstein FONT Meeting 2015/12/11

Preview Offset study results Now have results for 3 TeV machine and two 380 GeV machine setups (L*=4.3 m, 6 m) Getting maximum luminosity with small offset from dead-on collision Not sure why. Looks like donut beam, but it’s not. Sent email to Fabien Plassard, who designed the lattice. No reply yet. Also doing the single-beam tuning part of the two-beam tuning studies. Currently running Iteration 3 out of 5 for the normal setup (as done previously for 3 iterations) Also running Iteration 1 for a setup with no second DFS tuning stage, which has never been done. Wrote IPAC16 abstract and submitted.

For a 3 TeV setup

For a 3 TeV setup

For a 3 TeV setup

After adjusting the grid For a 3 TeV setup After adjusting the grid

After adjusting the grid For a 3 TeV setup After adjusting the grid

After adjusting the grid For a 3 TeV setup After adjusting the grid

For a 380 GeV setup

For a 380 GeV setup

For a 380 GeV setup

For a 380 GeV setup (L*=4.3 m)

Zoomed in to the central (low-offset) region. For a 380 GeV setup (L*=4.3 m) Zoomed in to the central (low-offset) region.

For a 380 GeV setup (L*=4.3 m)

Zoomed in to the central (low-offset) region. For a 380 GeV setup (L*=4.3 m) Zoomed in to the central (low-offset) region.

For a 380 GeV setup (L*=4.3 m)

Zoomed in to the central (low-offset) region. For a 380 GeV setup (L*=4.3 m) Zoomed in to the central (low-offset) region.

For a 380 GeV setup (L*=6 m)

For a 380 GeV setup (L*=6 m) Half scan, from 0 offset a point past where the absolute value of the deflection angle starts to decrease.

For a 380 GeV setup (L*=6 m)

For a 380 GeV setup (L*=6 m) Half scan, from 0 offset a point past where the absolute value of the deflection angle starts to decrease.

For a 380 GeV setup (L*=6 m)

For a 380 GeV setup (L*=6 m) Half scan, from 0 offset a point past where the absolute value of the deflection angle starts to decrease.

Luminosity After Tuning Stages (3 TeV) Single Beam Tuning Luminosity After Tuning Stages (3 TeV)

% Seeds reaching Nominal Luminosity Single Beam Tuning % Seeds reaching Nominal Luminosity

IPAC16 Abstract

More Plans Have started looking at IP Feedback luminosity recovery simulations Very initial stages. Promising start, but there are a few hiccups in the code. Code was unexpectedly better than expected, just a few minor points (we think) to correct, likely after the holidays. Still looking into why perfect collisions don’t make the highest luminosity (but still close). Doing 5 full iterations of tuning study with various DFS, Knobs, etc… Doing the first tuning study with only 1 stage of DFS tuning.