WAO10 2010/04

Luminosity Tuning andOperation Statistics at KEKBManabu Tanaka
Mitsubishi Electric System & Service Co., LtdYoshihiro Funakoshi
High Energy Accelerator Research Organization ( KEK )WAO10 2010/04

Contents･Introduction･Injection method･Orbit correction at collision point･Knob tuning･Crab cavities･Skew sextupole magnets

WAO10 2010/04

Contents･ Operation period･ Integrated and peak Luminosity･ SummaryWAO10 2010/04

Belle
8.0Gev eKEKB
3.5Gev e+
LINAC

1km

WAO10 2010/04

WAO10 2010/04

Injection method

Before the continuous injection mode

WAO10 2010/04

Injection method

After the continuous injection mode

WAO10 2010/04

Injection method

The present simultaneous injection

WAO10 2010/04

Orbit correction at collision point• Make a bump
Near the interaction point (IP) of HER
with steering magnets of HER• Called “ iBump feedback “.
• Best adjust→ The difference of position (Offset)
and angle (crossing angle) to 0

WAO10 2010/04

Orbit correction at collision point• Offset and crossing angle in the vertical→ Adjusted to 0
• Horizontal crossing angle ( 22mrad )→ No feedback• The horizontal offset ??
→ Used two kinds of feedbacks
Easy feedback ＆ Beam Size feedbackWAO10 2010/04

Orbit correction at collision point• Easy feedback
Feedback to keep the ratio
between the read value of a kick angle of ahorizontal steering magnet and the height ofhorizontal bump

WAO10 2010/04

Orbit correction at collision point• Beam Size feedback
Keep the LER beam size at some targetvalue.
• The feedbacks for the horizontal offset are
not used with the crab cavity.
→ Keep the beam-beam kick atsome target value.

WAO10 2010/04

Knob tuning3kmDX (mm)
CCCCCC

DY (mm)Only the collision point→ iBump feedback (every 1s)
Orbit corrections of the rings→ CCC (every 10s)

WAO10 2010/04

Knob tuning• When changed knobs
The orbits around the rings are distorted.

WAO10 2010/04

Knob tuning

By fitting the knob set vs. luminosity
curve with a parabolic function

WAO10 2010/04

Knob tuning
Tuning Knobs• iBump feedback
The target value of the horizontal offset,
the vertical offset, and the vertical crossing
angle are adjusted to the best value.
• Coupling、vertical dispersion
The x-y couplings and the verticaldispersion are important tuning knobs.

WAO10 2010/04

Knob tuning

Coupling and vertical dispersion tuning panelWAO10 2010/04

Knob tuning
Tuning Knobs• WaistThe minimum position of the vertical betafunction• Betatron-tune
Tune of Horizontal and VerticalWAO10 2010/04

Knob tuning

Betatron-tune plot chart

WAO10 2010/04

Knob tuning

Bunch Current Monitor

WAO10 2010/04

Knob tuning
Tuning Knobs• Vertex Point
The RF phase of LER is adjusted by theprogram.
• Chromaticity
SX is adjusted and to extend beam life.

WAO10 2010/04

Knob tuningDownhill Simplex MethodWAO10 2010/04

Knob tuning
Downhill Simplex MethodWAO10 2010/04

Knob tuning

Luminosity ↑Knob scanning by DSM

WAO10 2010/04

Knob tuning
HER knobs

iBump

LER knobs

Movement of knobs at DSM

WAO10 2010/04

Crab cavities

WAO10 2010/04

Crab cavities

Head-on collision

WAO10 2010/04

Crab cavities
KEKB operation with crab cavities
mAHER

LER

Pe ak Lu m in o sit y/ n b/ s

2000

251600201200

15800

10400

500
Be fo r e

Aft e rM ay, 2 0 0 9

WAO10 2010/04

Crab cavities• Why HER beam current was able to beincreased ?
1. The aperture was extended near the LER
crab cavities by the Optics change.
2. The βx in the collision point wasloosened.

WAO10 2010/04

Skew sextupole magnets

WAO10 2010/04

Skew sextupole magnets

WAO10 2010/04

Operation period
Hours

300

7000
6000
5000
4000
3000
2000
1000
0250
Days

200
150
100
5002002

2003

2004

2005 2006
Fiscal Year

2007

2008

2009

Hours

Days

WAO10 2010/04

Operation period
The operation time and contents
7000

OthersOperation Period [Hours]

6000

Maintenance5000

Trouble4000
Beam Tuning
3000
Machine Tuning

2000

Machine Study1000

Physics Run0
2002

2003

2004

2005 2006
Fiscal Year

2007

2008

2009

WAO10 2010/04

Operation period
The operation utilization rates
100%Others

90%
80%

Maintenance70%
Trouble60%
50%

Beam Tuning

40%
Machine Tuning

30%
20%

Machine Study

10%0%

Physics Run
2002

2003

2004

2005

2006

Fiscal Year

2007

2008

2009

WAO10 2010/04

Integrated and peak Luminosity

0 .8 00 .7 00 .6 0
0 .5 00 .4 0
0 .3 00 .2 00 .1 00 .0 0
09
2008
2007
2006
2005
2004

03
2002
2001
20

9900
2020

Fiscal Year（/fb/day）

Ave rage d Daily Luminosity20018016014012010080604020019（ / ｆｂ）

An nual Integrate d Luminosity

Summary

WAO10 2010/04

WAO10 2010/04

Acknowledgements

WAO10 2010/04

Thank you

WAO10 2010/04

Spare slides

WAO10 2010/04

Knob tuning

Bunch Current Monitor

WAO10 2010/04

Operation period
Detail content of operation in 2009
Trouble2%
Beam Tuning
4%
Machine Tuning
7%

Maintenance2%
Others0%

Physics Run
Machine Study
Machine Tuning

Machine Study
7%

Beam Tuning
TroubleMaintenance
OthersPhysics Run
78%

WAO10 2010/04

Operation period
Detail content of operation in 2008
Trouble4%
Beam Tuning9%

Maintenance3%
Others0%Machine Tuning2%

Physics Run
Machine Study
Machine Tuning
Beam Tuning
TroubleMachine Study
10%

Maintenance
OthersPhysics Run72%

/04 9/1
105
/105
/305
/505
/705
/05 9/1
106
/106
/306
/506
/706
/06 9/1
107
/107
/307
/507
/707
/07 9/1
108
/108
/308
/508
/708
/08 9/1
104

Number of aborts

WAO10 2010/04

Beam abort

HER Weekly Abort 2004/10 ～ 2008/12

RF
BeamLoss
EQ
VacMag

Date

OtherNot ReadyCrab60

50403020100/7/5/3/1/05 9/1
106
/106
/306
/506
/706
/906
/1
107
/107
/307/507/707/07 9/1
108/108/308/508
/708
/908
/1
105

05

05

05

1/9/105

04

04

Number of aborts

WAO10 2010/04

Beam abort

LER Weekly Abort 2004/10 ～ 2008/12RF
BeamLoss
EQ
Vac

Date

Mag
Other
Not ReadyCrab6050

4030

20

100

WAO10 2010/04

Beam abort
Before Crab Operation
Other
MagVacEQ

Not Ready

Crab Operation

RFRF
CrabBeamLoss

BeamLoss

Not ReadyOther

HER Weekly Abort 2004/10 ～ 2008/12

EQMagVacWAO10 2010/04

Beam abort
Before Crab Operation

MagVacOther Not ReadyRF

Crab Operation
RFEQCrabBeamLoss

Ready
Other

LER Weekly Abort 2004/10 ～ 2008/12

BeamLoss
EQMagVacWAO10 2010/04

Beam abort
HER & LER Crab Abort 2004/10 ～ 2008/12
HER Crab

LER Crab

30
20
10Date

/1
09

1/108

/908

/708

/508

/308

/108

1/107

/907

/707

/507

/307

/1007

Number of aborts40

WAO10 2010/04

Breakdown timeTransition of the trouble according to fiscalyear（ Ho u r ）800
Ot h e r s
Re fr ige r at o r
LINAC
Be lle
BMControl
Fac ilit ie s
Safe t yRFBT
M agn e t s
Vac u u m

700
600500400300200
10002002

2003

2004

2005

2006

Fisc al Y e ar2007

2008

WAO10 2010/04

Breakdown time
Trouble details in fiscal year 2008
Ot h e r s
19%
Vac u u m
25%

Re fr ige r at o r
0%
LINAC
2%
Be lle10%BM
1%
Control
1%
Safe t y0%
Fac ilit ie s0%

M agn e t s
11%

RF24%

BT
7%

VacuumMagnets
BTRF
SafetyFacilities
ControlBMBelleLINACRefrigerator
OthersWAO10 2010/04

Breakdown time
Trouble details in fiscal year 2009

BM0%

Re fr ige r at o r
13%
LINAC
4%
Be lle2%

Control
0 % Safe t y0%
Fac ilit ie s
0%

RF27%

Ot h e r s
1 % Vac u u m
10%
M agn e t s
8%

BT
35%

VacuumMagnets
BTRF
SafetyFacilities
ControlBMBelle
LINAC
Refrigerator
Others