APEX

RUN-10

APEX Schedule February 23-24, 2010

1am8pm

12x12 store

Nonlinearchromaticity Luo

12x12 ramp

3am

ramps

8am

injection

E-lensMontag

5am

chromfeedback MintyMarusic

7:30 amAGS OFF

Au104third development Vhs and Au104thirdTeam

BBATodd

injection

6am

APEX

RUN-10

High Lights of APEX Studies

chromaticity Feedbacks: Minty, Marusic, … demonstrated at least partially the ability to measure the

chromaticity (via rf frequency modulation) while additionally modulating the chromaticity (by changing sextupole fields)

the problem of data corruption (observed last week) when measurements were stopped, then restarted has been solved

The chromaticity measurements however evidenced unexpected structure correlated with 120 Hz shifts in the average - average over rf frequency modulation. It was later confirmed that these 120Hz interferences is the result of modulating the sextupoles. However, it seems to be benign to the chrom measurement and may not affect feedback system

APEX

RUN-10

High Lights of APEX Studies

Au104third Ramp Development Team: Vincent, Al, Michiko, Yun, Steve, Guillaume, Mei Goal: accelerate full loaded beam to store energy with

vertical tune close to 1/3, 0.005 or closer A total of 5 ramps with both beams. 6 yellow bunches survived to store energy with

Qy~0.325 and transmission efficiency of 85% Blue beam still stays at Qy=0.348. Remaining issues

Slow losses at the end of the ramp. Blue ramp tuning, orbit and chromaticity

APEX

RUN-10

Au104third Ramp Development

Losses when beta* gets below 1m

Blue vertical tune is still further away from 1/3.Need ramp tuning(orbit and chromaticity) to pushIt closer.

APEX

RUN-10

High Lights of APEX Studies

Non-linear chromaticity Hammered by several failures

Blue magnet quench Blue abort kicker prefire

had a total of three fills. did 6 chromaticity measurements of both rings in the third fill.

These data are reproducible and will be used for modeling of Q' and Q'’

no non-linear chromaticity Q'' correction applied. Q''s are all below 1500 in the measurements of up to 0.75mm radial wiggling

Exercised the orbit feedback at store in Yellow. Very encouraging to see the average rms goes down w. feedback on.

APEX

RUN-10

APEX Schedule March 3, 2010

1pm

Injection(WFG separated)

8am

Injection

BBA Satogata

Chromaticity Feedback

MintyMarusic

3pm 8pm11am

10 Hz feedback Michnoff

1/3 IntegerRamp development Bai + 1/3 Integer Team

Effect of blue tails onYellow (e-lens) MontagDrees

Ramps Ramps