APEX Schedule April :30am12:30pm5pm IBS suppression lattice Litvinenko, Tepikian +team Back 2 Phys 4pm Nonlinear Chromaticity (Response Matrix) Luo Tepikian 7:30am5am Store 6 bunches 0.5-1x10 9 ppb NO rebucketing BBQ Store Ramp 1: 12 bunches Ramp 2: physics Needs collisions STAR, PHENIX ON Beta* Squeeze Pilat, Malitsky, Ptitsyn Satogata, Bruno Common Mode noise Schultheiss TBD Injection 1-6 bunches 0.5-1x10 9 ppb IBS lattice 2:30pm Store 6 bunches 0.5-1x10 9 ppb NO rebucket BPMs ORM Satogata Niedziela

 * squeeze beam experiment F. Pilat, D. Bruno, N. Malitsky, V. Ptitsyn, T. Satogata, S. Tepikian  Ramp 12 bunches, normal intensity, no rebucketing  Squeeze beta in 4 installments from 0.8 to 0.6 m  Calculate and change the IR8 model for both rings  Adjust tune and chromaticities  Set slow factor 4 (not faster than 0.5 A/sec)  Commit changes  Check orbit, tunes and lifetime, correct if needed  Measure collision rate in IP8  Measure dispersion  Measure optics with AC dipole  Revert the store stone Plan: Objectives: dynamic  * squeeze operational procedure + Ramp Designer module for offline and online optics changes

Blue Optics after online matching  * = (0.70, 0.70) in IR 8

Yellow Optics after online matching  * = (0.71, 0.77) in IR 8

Blue and Yellow behavior during the 0.75m  * squeeze. Blue seamlessly went to 0.7m 2 attempts to squeeze Yellow to 0.75 failed (even with compensation of measured tune shifts the second time)

Summary beta* squeeze  Blue can go down to 0.7m without a glitch.  In Yellow, we lost the beam on slow losses on both attempts when squeezing down to 0.75 even after compensating for the tune shift.  We need to understand why even in the model the yellow matching and squeeze are more difficult  Next attempt: May 8-9

APEX Schedule April am 1pm 8am Beam beam compensators Fischer+Calaga +team 5am1am Nonlinear Chromaticity Off momentum response matrix Luo Tepikian +team 10pm8pm Injection Few bunches AC dipole Store 6 bunches NO rebucketing BBQ Beta Beat Calaga Store Blue: 24 bunches Yellow: 6 bunches HF Schottky BBQ AC dipole Test +DA Bai Beta Beat Calaga IBS suppression lattice Litvinenko, Tepikian +team Injection 1-6 bunches IBS lattice Au77ibs BBA Niedziela Injection Continuous ramp activations 6am AGS OFF