APEX Schedule April 18 2007

10:30am 12:30pm 5pm

05-18IBSsuppressionlatticeLitvinenko,Tepikian+team

Back2Phys

4pm

07-06NonlinearChromaticity(Response Matrix)LuoTepikian

7:30am5am

Store6 bunches0.5-1x109ppbNO rebucketingBBQ

StoreRamp 1: 12 bunches Ramp 2: physicsNeeds collisionsSTAR, PHENIX ON

07-21Beta*SqueezePilat, Malitsky, PtitsynSatogata, Bruno

07-19CommonMode noiseSchultheiss

TBD Injection1-6 bunches0.5-1x109ppbIBS lattice

2:30pm

Store6 bunches0.5-1x109ppbNO rebucketBPMs

06-31ORMSatogataNiedziela

* squeeze beam experimentF. 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 seamlesslywent to 0.7m

2 attempts to squeezeYellow to 0.75 failed(even with compensationof measured tune shiftsthe 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 24-25 2007

4am

1pm

8am

07-07Beam beamcompensatorsFischer+Calaga+team

5am1am

07-06NonlinearChromaticityOff momentumresponse matrixLuoTepikian+team

10pm8pm

InjectionFew bunchesAC dipole

Store6 bunches

NO rebucketingBBQ

07-08BetaBeatCalaga

StoreBlue: 24 bunchesYellow: 6 bunchesHF SchottkyBBQ

07-08AC dipoleTest +DABai

07-08Beta BeatCalaga

05-18IBSsuppressionlatticeLitvinenko,Tepikian+team

Injection1-6 bunchesIBS latticeAu77ibs

06-31BBA

Niedziela

Injection

Continuousrampactivations

6am

AGSOFF