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

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WAO10 2010/04

Injection method

Before the continuous injection mode

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Injection method

After the continuous injection mode

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Injection method

The present simultaneous injection

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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

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Crab cavities

WAO10 2010/04

Crab cavities

Head-on collision

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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

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Operation period
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

2000Machine Study

1000

Physics Run

02002

2003

2004

2005 2006
Fiscal Year

2007

2008

2009

WAO10 2010/04

Operation period
The operation utilization rates
100%

Others90%
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
Transition of integrated luminosity and a day
integrated luminosity

Fiscal Year

09
2008
2007
2006
2005
2004
2003
2002
2001
2000
2099

0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00

（/fb/day）

Averaged Daily Luminosity

20018016014012010080604020019（/ｆｂ）

Annual Integrated 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
2009 ofOpration
statistics
Detail content
operationin 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 20082008 Opration statistics
Trouble4%
Beam Tuning
9%

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 ～ 2008/12RF
BeamLoss
EQ
VacMagDate

Other
Not ReadyCrab6050403020100

Date
08

/1

1/9/7/5/3

Not Ready080808

08

1/1/1/9/7

Other

08

07

07/5/3Mag

07

07/11Vac07

07/1/9EQ06/7/5/3

BeamLoss

06

06

06

06

1/1/1/9/7/5/3

RF

06

05

05

05

05

05

/1

1/9/105

04

04

Number of aborts

WAO10 2010/04

Beam abort

LER Weekly Abort 2004/10 ～ 2008/12
Crab6050403020100

WAO10 2010/04

Beam abort
HER Weekly Abort
2004/11Crab～ 2006/12
BeforeOperation(Before Crab Operation)
OtherMagVacEQ

Not ReadyRF

HER Weekly Abort
2007/2 ～ 2008/12(CrabCrabOperation)
Operation
RFCrabBeamLoss

BeamLoss

Not ReadyOther

HER Weekly Abort 2004/10 ～ 2008/12

EQ
Mag

VacWAO10 2010/04

Beam abort

LER Weekly Abort
2004/11 ～ 2006/12
BeforeOperation(Before Crab
Crab Operation)

Mag
Vac

Other Not ReadyRF

LER Weekly Abort
2007/2 ～ 2008/12(CrabOperation)
CrabOperation
RFEQ

Crab

BeamLoss

Not ReadyOther

LER Weekly Abort 2004/10 ～ 2008/12

BeamLoss
EQ
Mag

VacWAO10 2010/04

Beam abort
HER Weekly Abort～ 2008/12
HER & LER2007/2
Crab Abort
2004/10 ～ 2008/12(Only Crab Abort)
HER Crab

LER Crab30
20
10Date/109

1/108

/908

/708

/508

/308

/108

1/107

/907

/707

/507

/307

/1007

Number of aborts40

WAO10 2010/04

Breakdown time
Transition of the trouble according to fiscal（ Ho u r ）
year
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
600
500
400
300
200
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%
BM1%
Control
1%
Safe t y0%
Fac ilit ie s0%

M agn e t s
11%

RF24%

BT
7%

VacuumMagnets
BTRF
SafetyFacilities
ControlBM
Belle
LINAC
Refrigerator
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
ControlBM
Belle
LINAC
Refrigerator
Others