yoshihiro funakoshi - tuning and operation statistics at kekb manabu tanaka mitsubishi electric...

Luminosity Tuning and Luminosity Tuning and Operation Statistics at KEKBOperation Statistics at KEKB

Manabu TanakaMitsubishi Electric System & Service Co., Ltd

Yoshihiro FunakoshiHigh Energy Accelerator Research Organization ( KEK )

WAO10 2010/04 WAO10 2010/04

ContentsContents

･･Introduction Introduction ･･Injection method Injection method ･･Orbit correction at collision point Orbit correction at collision point ･･Knob Knob tuningtuning･･Crab cavitiesCrab cavities･･Skew Skew sextupolesextupole magnetsmagnets

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ContentsContents

･･ Operation period Operation period ･･ Integrated and peak Luminosity Integrated and peak Luminosity ･･ SummarySummary

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1km

KEKB

3.5Gev e+

8.0Gev e-Belle

LINAC

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Injection methodInjection method

BeforeBefore the the continuous injection mode continuous injection mode

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After the After the continuous injection mode continuous injection mode

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TThe present simultaneous injectionhe present simultaneous injection

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Orbit correction at collision pointOrbit correction at collision point

•• MMake a bump ake a bump Near the interaction point (IP) of HERNear the interaction point (IP) of HERwith steering magnets of HERwith steering magnets of HER

•• CalledCalled ““ iBumpiBump feedbackfeedback ““..

•• BBest adjust est adjust →→ The dThe difference of positionifference of position (OOffsetffset))

and angleand angle (crossing anglecrossing angle)) to to 00

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•• Offset and crossing angle in the verticalOffset and crossing angle in the vertical→→ AAdjusted to 0 djusted to 0

•• Horizontal crossing angle Horizontal crossing angle ( 22mrad )( 22mrad )→→ NNo feedbacko feedback

•• The horizontalThe horizontal ooffsetffset ????→→ Used two kinds of feedbacks Used two kinds of feedbacks

Easy Easy feedbackfeedback ＆＆ Beam Size feedbackBeam Size feedback

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•• Easy feedbackEasy feedbackFeedback to keep the ratioFeedback to keep the ratiobetween between the read value of a kick angle of a the read value of a kick angle of a

horizontal steering magnethorizontal steering magnet and and the height of the height of horizontal bumphorizontal bump

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• Beam Size feedback Keep the LER beam size at some target

value.

•• The feedbacks for the horizontal offset are The feedbacks for the horizontal offset are not used with the crab cavity.not used with the crab cavity.

→→ KKeep the beameep the beam--beam kick at beam kick at some target value.some target value.

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Knob Knob tuningtuningWAO10 2010/04 WAO10 2010/04

Only the collision point Only the collision point →→ iBumpiBump feedbackfeedback ((every 1severy 1s))

OOrbit corrections of rbit corrections of the the ringsrings→→ CCCCCC ((every 10severy 10s))

CCCCCC CCCCCC

3km3km

DX (mm)DX (mm)

DY (mm)DY (mm)

Knob Knob tuningtuning

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

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BBy fitting the knob set vs. luminosity y fitting the knob set vs. luminosity curve with a parabolic functioncurve with a parabolic function

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Tuning KnobsTuning Knobs•• iBumpiBump feedbackfeedback

The target value of the horizontal offset, The target value of the horizontal offset, the vertical offset, and the vertical crossing the vertical offset, and the vertical crossing angle are adjusted to the best valueangle are adjusted to the best value. .

•• CouplingCoupling、、vvertical ertical ddispersionispersionThe The xx--yy couplings and the vertical couplings and the vertical

dispersion are important tuning knobs.dispersion are important tuning knobs.

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CCoupling and vertical dispersion oupling and vertical dispersion tuningtuning panelpanel

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Tuning KnobsTuning Knobs•• WaistWaist

The minimum position of the vertical beta The minimum position of the vertical beta functionfunction

•• BetatronBetatron--tune tune Tune of Horizontal and VerticalTune of Horizontal and Vertical

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BBetatronetatron--tune plot charttune plot chart

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Knob tKnob tuninguning

Bunch Current MonitorBunch Current Monitor

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Tuning KnobsTuning Knobs•• Vertex PointVertex Point

The RF phase of LER is adjusted by the The RF phase of LER is adjusted by the program. program.

•• ChromaticityChromaticitySX is adjusted and to extend beam life. SX is adjusted and to extend beam life.

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Knob Knob tuningtuningDownhill Simplex MethodDownhill Simplex Method

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KKnob scanning by DSMnob scanning by DSM

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Luminosity ↑


MMovement of knobs at DSMovement of knobs at DSM

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HER HER knobsknobs

LER LER knobsknobs

iBumpiBump

Crab cavitiesCrab cavitiesWAO10 2010/04 WAO10 2010/04


HeadHead--on collisionon collision


KEKB operation with crab cavities

0

400

800

1200

1600

2000

Before After May, 2009

mA

0

5

10

15

20

25

/nb/sHER LER Peak Luminosity

Crab cavitiesCrab cavities

•• WhyWhy HER beam current was able to be HER beam current was able to be increased ? increased ?

1.1. The aperture was extended near the LER The aperture was extended near the LER crab cavities by the Optics change. crab cavities by the Optics change.

22.. The The ββxx in the collision point wasin the collision point wasloosened. loosened.

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Skew Skew sextupolesextupole magnetsmagnetsWAO10 2010/04 WAO10 2010/04

Operation periodOperation period

0

50

100

150

200

250

300

2002 2003 2004 2005 2006 2007 2008 2009

Fiscal Year

Day

s

0

1000

2000

3000

4000

5000

6000

7000

Hours

Days Hours

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Operation periodOperation periodThe operation time and contents

0

1000

2000

3000

4000

5000

6000

7000

2002 2003 2004 2005 2006 2007 2008 2009

Fiscal Year

Ope

rati

on P

eri

od

[Hours

]

Others

Maintenance

Trouble

Beam Tuning

Machine Tuning

Machine Study

Physics Run

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The operation utilization rates

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

2002 2003 2004 2005 2006 2007 2008 2009

Fiscal Year

Others

Maintenance

Trouble

Beam Tuning

Machine Tuning

Machine Study

Physics Run

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Integrated and peak LuminosityIntegrated and peak Luminosity

020406080

100120140160180200

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

2009

Fiscal Year

（/ｆｂ

）

0 .00

0 .10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

（/fb

/day）

Annual Integrated Luminosity Averaged Daily Luminosity

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SummarySummary WAO10 2010/04 WAO10 2010/04

AcknowledgementsAcknowledgements

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Thank you Thank you

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Spare slides Spare slides

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Bunch Current MonitorBunch Current Monitor

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Physics Run78%

Machine Tuning7%

Beam Tuning4%

Trouble2% Maintenance

2%

Others0%

Machine Study7%

Physics Run

Machine Study

Machine Tuning

Beam Tuning

Trouble

Maintenance

Others

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Detail content of operation in 2009


Physics Run72%

Machine Tuning2%

Beam Tuning9%

Machine Study10%

Others0%

Maintenance3%

Trouble4% Physics Run

Machine Study

Machine Tuning

Beam Tuning

Trouble

Maintenance

Others

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Detail content of operation in 2008

Beam abortBeam abortWAO10 2010/04 WAO10 2010/04

HER Weekly Abort 2004/10 ～　2008/12

0

10

20

30

40

50

60

04/9

04/1

105

/105

/305

/505

/705

/905

/11

06/1

06/3

06/5

06/7

06/9

06/1

107

/107

/307

/507

/707

/907

/11

08/1

08/3

08/5

08/7

08/9

08/1

1

Date

Num

ber

of

abort

s

RF BeamLoss EQ Vac Mag Other Not Ready Crab


LER Weekly Abort 2004/10 ～　2008/12

0

10

20

30

40

50

60

04/9

04/1

105

/105

/305

/505

/705

/905

/11

06/1

06/3

06/5

06/7

06/9

06/1

107

/107

/307

/507

/707

/907

/11

08/1

08/3

08/5

08/7

08/9

08/1

1

Date

Num

ber

of

abort

s

RF BeamLoss EQ Vac Mag Other Not Ready Crab


Before Crab OperationBefore Crab Operation

Crab OperationCrab Operation

HER Weekly Abort 2004/10 HER Weekly Abort 2004/10 ～～ 2008/122008/12

BeamLoss

RF

Crab

VacMag

Not Ready

OtherEQ

BeamLoss

RFVac

Mag Not ReadyOther

EQ


Before Crab OperationBefore Crab Operation

Crab OperationCrab Operation

LER Weekly Abort 2004/10 LER Weekly Abort 2004/10 ～～ 2008/122008/12

EQ

Other Not Ready

Mag

Vac

RF

BeamLossBeamLoss

RFCrab

VacMag

Ready

Other EQ


HER & LER Crab Abort 2004/10 HER & LER Crab Abort 2004/10 ～～ 2008/122008/12

0

10

20

30

40

07/1

07/3

07/5

07/7

07/9

07/1

1

08/1

08/3

08/5

08/7

08/9

08/1

1

09/1

Date

Num

ber

of

abort

s

HER Crab LER Crab

Breakdown timeBreakdown timeTransition of the trouble according to fiscal

year

0

100

200

300

400

500

600

700

800

2002 2003 2004 2005 2006 2007 2008

Fiscal Year

（Hour）

Others

Refr igerator

LINAC

Be l le

BM

Contro l

Fac i l i t ies

Safety

RF

BT

Magnets

Vacuum

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Breakdown timeBreakdown time

Trouble details in fiscal year 2008

Vacuum25%

Magnets11%

BT7%

Others19%

Be l le10%

Contro l1%

BM1%

Fac i l i t ies0%

Safety0%

LINAC2%

Refr igerator0%

RF24%

VacuumMagnets BT RF Safety FacilitiesControl

BM Belle LINAC RefrigeratorOthers

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Breakdown timeBreakdown time

Trouble details in fiscal year 2009

Vacuum10%

BT35%

Magnets8%

Others1%

Be l le2%

Contro l0%

BM0%

Fac i l i t ies0%

Safety0%

LINAC4%

Refr igerator13%

RF27%

VacuumMagnets BT RF Safety FacilitiesControl

BM Belle LINAC RefrigeratorOthers

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yoshihiro funakoshi - tuning and operation statistics at kekb manabu tanaka mitsubishi electric...

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