APEX

RUN-11

APEX Schedule May 11, 2011

Injection

12am 8am

BBAMinty, Jordan, Liu, Rob, Rob, Kevin, …

Spin Flipper

Bai, Pablo, Oddo, Craig, Kevin

IPM calibrationR. Connolly, Minty, Marusic

1am 2am

IPM calibrationR. Connolly, Minty, Marusic

Injection

6am

IP Transfer MatrixTepikian, Ptitsyn

On/Off momentum beta beat, and beta* measurementCalaga, White, Luo, Bai

5amO

RM

for

GO

FB

Min

ty,

Liu

, R

ob

, R

ob

, K

evin

, …

Store Store Store

APEX

RUN-11

IPM Channel2Channel Calibration

PI: R. Connolly, M. Minty, S. Tepikian Confirmed that the emittance dependence on beam position at IPM, i.e.

separation bumps at IP2 was due to the gain depletion of the MCPs at the center of the measurement aperture

APEX

RUN-11

IPM Channel2Channel Calibration

Uncorrected data and indicates a vertical beam size increase of 16% or emittance increase of 35% whenbump is removed

Same data with gain and offset corrections. Now the size change is 5%, about the scatter in shot-shot measurements

APEX

RUN-11

Blue Spin Flipper Commissioning: M. Bai, P. Oddo, C. Dawson, T. Roser, P. Pile, …

1st ac dipole bump

2nd ac dipole bump

both

ac

dip

ole

b

um

ps

APEX

RUN-11

Blue Spin Flipper Commissioning: M. Bai, P. Oddo, C. Dawson, T. Roser, P. Pile, …

#5 #1#2 #4

Each individual ac dipole DSA response

Conclusion:

• H DSA response is dueto the difference of roll of each ac dipole

• took both 1024 turn by turn bpm data and million turn bpm data for all cases. Offline analysis to extract the roll of each ac dipole

APEX

RUN-11

BBA Reproducibility: M. Minty, J. Ziegler,…

May 2, In Yellow ring with 9GeV Au beam May 11, In Blue ring with 100 GeV Au beam

Checked stability of quadrupole power supply Yi6-qf3-ps is stable from tune data

Checked stability of corrector power supplies Yo5-tv3, yi6-tv2 and yi6-tv4 current reproducibility reaches the power

supply regulation specs, i.e. +-50A/2^12= 24 mA

reproducibility of bump settings are limited by corrector power supply controller resolution

APEX

RUN-11

BBA Reproducibility

APEX

RUN-11

Measure Twiss and Coupling

PI: S. Tepikian, V. Ptitsyn

APEX

RUN-11

Measure Twiss and Coupling

Yellow Ring IP6 Varied Q1, Q2 and QS Beta*: 0.875m Horizontal, 0.878m vertical

Yellow Ring IP8 Varied Q1, Q2 and QS Beta*: 0.923m Horizontal, 0.919m Vertical

Plan Need to compare this with the analysis of coupling-free to demonstrate

the effect of coupling on beta* measurement Repeat yellow measurement with better vertical tune measurements Measure blue ring IPs

APEX

RUN-11

Effect of Measured ORM for GOFB

PI: Chuyu Liu, M. Minty, Rob M, Rob H

APEX

RUN-11

Effect of Measured ORM for GOFB

With model matrix With measured matrix

Time domain

Frequency domain

APEX

RUN-11

Off Momentum Beta Beat

• PI: R. Calaga, Y. Luo, S. White, M. Bai• ~40% chromatic beta beat was observed during 250 GeV pp run in 2009 • Two correction techniques:

• adjust phase advance between IP6 and IP8: R. Calaga• correct non-linear chromaticity: Y. Luo

• Measured on-momentum optics• ~ 20% beta beat(peak) in both rings• Blue beta* Yellow:

• first attempt of radial steering killed beam• orbit xmean wasn’t properly zeroed before activating radial steering

APEX

RUN-11

Off Momentum Beta Beat

APEX

RUN-11

APEX Schedule May 25, 2011

Injection

8am

11p

m

BB

AM

inty

, Jo

rdan

, Liu

, R

ob

, R

ob

Beam

-beam

Sp

ace c

harg

e

Ale

xei

10am 2pm

Local

decou

plin

gZ

imm

er,

Vad

imB

ai

Injection

IP Transfer MatrixTepikian, Ptitsyn

Off momentum beta beat measurement/correction

Calaga, White, Luo, Bai

6pm

10 H

z G

OFB

for

Ram

pM

inty

, Liu

, R

ob

, R

ob

, G

RD

Store Store Store

12pm

Ramp

Dyn

am

ic b

eta

* kn

ob

GR

D,

Al

5pm

Local decoplingZimmer, Vadim, Bai

8pm

Back2P

hysic

s

12am

Q1 modulation for beta*Yun, Al