Status of SuperKEKB Main Ring
Till June 19th

Hiroshi Sugimoto
On Behalf of SuperKEKB Commissioning Group
B2GM June 2020

Topics- Operation Summary- Major Changes After the Last (2019c) Run- Luminosity Tuning- Introduce Crab Waist(CW) scheme to both rings.
- Horizontal angle orbit at IP and SR to PXD- Adjustment of the anti-solenoid field (ESL/ESR) of QCS.
- Rotatable sextupole to control chromatic betatron coupling (XY-coupling).

- Other Topics

06/22/2020

B2GM June 2020

2

Status of Operation- We have broken the KEKB’s record! (2.108 x 1034 cm-2s-1)- Peak luminosity = 2.23×1034 cm-2s-1 at 679(LER), 639(HER) mA, June 15th

Cabling Work for HER CW

Vacuum Scrubbing
06/22/2020

LER Crab Waist ON

HER Crab Waist ON
B2GM June 2020

New Record

Reduce # of Bunches3Integrated Luminosity- Integrated luminosity: ~ 50 fb-1 (2020/03~2020/06/13)

Y. Ohnishi- Integrated luminosity per day: 1 fb-1
It is depending on study time andmachine troubles.
- We are struggle with machine
troubles related to aging hardware
not only in main rings but also
hardware in the injector linac
including beam transport line.

06/22/2020

B2GM June 20204

Machine Parameters- Major changes from the last run:
- LER high emittance lattice (To make beam lifetime longer)- Reduce # of bunches (To reduce BG to TOP detector and enable high-current operation.)
Y. Ohnishi

06/22/2020

B2GM June 2020

5

Major Issues- Luminosity and Beam Optics Tuning- Correction of beam optics parameters at IP- A reliable and robust strategy for low emittance tuning- Injection- Stability of the injected beam, beam optics matching, etc.
- Stable and Safe Operation- Beam abort due to unknown issues- Aging hardware- Beam Background (BG) to Belle II- Currently, BG to TOP detector limits high current operation.
06/22/2020

B2GM June 2020

6

Major Changes After the Last (2019c) Run

pressure burst happened near them with a QCS quench .
• A huge
were damaged
in beam
totalloss
soand
far.

MajorThe
Changes
after
Last (2019c)
Runcause, which
inducesthe
the abnormalbeam, is unknown.

•
e3 2019c), D02V1(Phase3 2019ab), D02V1 (Phase2)• A candidate is dusts in the beam pipes.
se2)- Replacement of damaged collimator head
Photo of a D02V2 bottom jaw.

T. Ishibashi

Photo of a D02V2 top jaw.

IRPressure bursts required in orderbeam
to increase beam current.

e-

HER

mator is undergoing.
set to D06V2 in a chain of low-Z collimator R&D.

HERコリメータ
D12 H1, H2, H3, H4
D12 V1, V2, V3, V4e+

LERコリメータ
HERコリメータ
LER
D01 H3, H4, 5
TSUKUBA D02 H1, H2, H3, H4
D02 V1
D01 V1
LERコリメータ
D03 H1SuperKEKB Main Ringwhich is the most crucial
vertical collimator for
QCS and Belle II detector
protection

06/22/2020

B2GM June 2020
IPAC'20 Virtual Presentation

HERコリメータ
D09 H1, H2, H3, H4
D09 V1, V2, V3, V4: Vertical Collimator (KEKB type)

ARES
WIGGLERWIGGLER
ARES

Phase-I

Phase-II: Horizontal Collimator (KEKB type)

OHO

NIKKO

Phase-IIIHead opposite
the damaged
vertical collimator in LERThis willprotects headthe D02V1 New
collimator

Replacement work in the presence ofRadiation Science Center .
SC

17

WIGGLERa factorof 2.5ofisa expected
a simulation.
- Installation
new verticalbycollimator(D06V1) in LER.

SC

beam
vertical collimator (D06V1)
in LER.

: Horizontal Collimator (SuperKEKB type): Vertical Collimator (SuperKEKB type): Horizontal Collimator (SuperKEKB type): Vertical Collimator (SuperKEKB type): Horizontal Collimator (SuperKEKB type): Vertical Collimator (SuperKEKB type)

LERコリメータ
D06 H1, H3
D06 V1, V2

FUJI
e-

e+

BOR

22 8

Major Changes after the Last (2019c) Run- Introduce Crab Waist (CW) scheme- A scheme to mitigate a sort of hourglass effect.
- Optimum waist position of a particle depends on its horizontal orbit offset
at IP.
- A particle at sextupole feels focusing/defocusing force depending on horizontal offset.
- An appropriate set of sextupoles can align the waist position along the central
trajectory of the other one while minimizes unwanted forces from sextupoles.
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Defocusing effect<latexit sha1_base64="Htw5fZvAtHd0cJFSRZLqvYOnn3c=">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</latexit>

x>0

Focusing effect<latexit sha1_base64="vNXMniOh1qrMVan3Q8BBt+qMETE=">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</latexit>

06/22/2020

B2GM June 2020

x<0

CW sextupolex<latexit sha1_base64="kv9kuKedlRv0x2jtWWPEjbggMic=">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</latexit><latexit

9

Major Changes after the Last (2019c) Run- Individual power supply is needed for sextupole magnets near IP.
- Cabling work has been successfully completed.
- We tried LER first , then introduce it to HER during 2020a,b run.
No CW (~2019c)
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K2 +

CW

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06/22/2020

K2

PS

PS
B2GM June 2020

K2

PS

PS

PS
10

Luminosity Tuning

Specific Luminosity- Owing to CW, collision operation at high-bunch-current region is possible 2020a,b.
Specific luminosity Lsp [cm−2 s−1 /mA2 ]- Many trials to keep specific luminosity at higher-bunch-current region.
8.00
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
0.00

2019c
2020ab
0.10

0.20

0.30

0.40

0.50

2

06/22/2020

Ie+ × Ie− [mA ]B2GM June 2020

12

Neither occupancy nor irradiation itself is currently a problem!

Horizontal Angle of Beam Orbit at IP and SR on PXD- Localized horizontal angle of 690 µrad is applied at IP to minimize SR on PXD.
- While this angle causes beam-optics distortion.
- We tried different angle (140 µrad)
which minimizes the optics distortion.
690 µradBeam Optics (Dispersion Function)
690 µradPXD Sync Rad 4.6.2020, p. 2e<latexit sha1_base64="7t/DTKGz60M2LuOaZvpqTfOBZGk=">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</latexit>
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sha1_base64="W5lROpio1P7bcGftJhJoyDZfRYw=">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</latexit>
sha1_base64="bwG1Y6fvRuc4d6YuGZfQdyctUxs=">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</latexit>

140 µradIP
06/22/2020

B2GM June 202013

Horizontal Angle of Beam Orbit at IP and Luminosity- No improvement in luminosity,(or rather worse?), and SR level is indeed higher.
- We decided to back to the original angle value 690 µradH-angle adjustment
690 µrad140 µradSpecific luminosity Lsp [cm−2 s−1 /mA2 ]

.

8.00
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
0.00

690 µrad140 µrad
0.10

0.20

0.30

0.40

0.50

2

Ie+ × Ie− [mA ]06/22/2020

B2GM June 202014

Chromatic XY-Coupling (Ch-XYC) Correction - Simulation - Ch-XYC correction will effectively suppress beam blow up.

06/22/2020

B2GM June 2020

K. Oide15

grated field strength variation among the LER dipole
magnets and the wiggler magnets. The standard deviations are measured to be 2u10-4 for the LER dipoles,
which is sufficiently small. The wigglers vary more instrength, with a standard deviation of ~1u10-3. This larger variation was expected as the wigglers are much shorter than the dipoles, as seen in Table 1. This variation is
not a problem, since the errors can be compensated for by
optical correction during beam operation.

Ch-XYC Correction - First Trial -nents of the IR quadrupole magnets are plotted against themultipole order. Blue and red solid circles correspond to
I=300 A and 500 A, respectively. The tolerance is indicated by the red dotted line.
The magnet fabrication and field measurements wentsmoothly for the most part, though there was a water leakcaused by bad silver alloy brazing. The magnet data, theexcitation curves and the effective lengths obtained fromthe field measurements were installed in the database intime for beam commissioning.

Rotation anglesFigure
at3:06/08
Field strength variation of the LER dipole magnets.

IP

Figure 4: Field strength variation of the wiggler magnets.
Figure 6: Sextupole on the tilting table.

06/22/2020

June Colliders
2020
01 CircularB2GM
and Linear

yright © 2016 CC-BY-3.0 and by the respective authors- Correction with changing rotation of sextupole magnets.
- Rotation angle is determined by measured Ch-XYC and the model accelerator.
TILTING SEXTUPOLES- Two sets of rotation angles are tried.
Skew sextupole magnets were found to be very effective in controlling the X-Y coupling at the IP during
KEKB operation [5]. At SuperKEKB, the ratio of the- 06/05: Only 4 sextupole magnets near IP are tilted as the firstskew test.
and normal sextupole field will be controlled bytilting the sextupole magnets. The required range of thetilt is r30 degree (~523 mrad), corresponding to 0~100%- 06/08: Use 14 rotatable sextupole magnets
M. Masuzawa
skew field.

ISBN 978-3-95450-147-216

Ch-XYC Correction - Result - No improvement was obtained by Ch-CYC correction so far.
- The study was done concurrently with field adjustment of QCS(ESL/ESR),
and we found that the ESL/ESR
adjustment has strong
impact on the machine condition.
- In addition, Ch-XYC measurement
itself is a very challenging issue, thus
ESL/ESR
it’s not so surprising that the rotation
angles we set did not give better
luminosity performance.
- We finally needs a tool which enables
us Ch-XYC scan during beam collision.
Ch-XYCC (1)06/22/2020

B2GM June 2020

Ch-XYCC (2)17Other Topics

Fast (33kHz) IP Orbit Feedback- Some test runs were performed. The FB system basically works.
- However, the FB system caused beam aborts or QCS quench in some conditions.
1.iBumpfeedback(FB)system and we applied countermeasures to the system.
- These unexpected
eventsare analyzed,- Test run of the revised system is ongoing.
Correctors are in HER.

H. Fukuma

Slow FB and fast FB use same
BPMs and correctors.
Repetition of fast FB is 33kHz.

FB Target
FB Monitor

06/22/2020

B2GM June 202019

Beam Abort Events

H. Ikeda- Currently, HER beam loss abort due to unknown reason is the most frequent event.
- We also have abort events due to misfiring of pulsed magnets in the injector linac.
- Detailed investigation to reduce beam aborts has started.
Beam-related Aborts

All Abort Events in 2020a,b

April
06/22/2020

May

April
B2GM June 2020

M. Satoh-san’s talkMay
20

Transverse Injection Oscillation

S. Terui- Bunch oscillation monitor shows that a part of bunch train oscillates due toremaining field of (horizontal) pulsed injection kickers.
- Vertical oscillation is also observed. <- kicker rotation and/or XY-coupling?
- We are trying to identify the source of the oscillation and cure this issues to reduce
First vertical oscillation maybe cause one side kicker. K1
background to Belle II.
or K2
Injection
oscillation
LER vertical
Next page explain.

LER horizontal
0 turnAfter 1 turnInjection oscillation

After 2 turn

Oscillation is smaller

06/22/2020

After 20 turn

Oscillation is bigger again.
But not next injection timing.
Because of relevance monitor location
and beam phase?

After 3 turn

After 3 turn

Oscillation is a part of bunch train
After 16 turn

After 2 turn

After 4 turn

After 5 turn

After 6 turn

After about 60 turn

Vertical axis = intensity * displacement.
Horizontal oscillation(max point ) is bigger thanvertical(max point). Maybe over factor 5.

B2GM June 202021

Vacuum Scrubbing

Y. Suetsugu

1.
1. MR運転状況
MR運転状況

- The mostdominant
componentof storage
BG is beam-gas scattering in LER.
•• Vacuum
scrubbing(Phase_3
2020ab)
Vacuumscrubbing(Phase_3
2020ab)- We hope the BG component will be reduced as dP/dI decreases.
HER

LER

06/22/2020

B2GM June 202022

Difficulty in Beam Optics Correction- We found that global correction does not always reduce vertical beam size.
- This implies that beam size is sensitive to local beam optics parameters.
- We guess detailed optics in interaction region is a key, but still don’t know a robust
strategy to get small beam size.
Beam Optics Distortion (b)Beam Optics Distortion (a)<latexit sha1_base64="LIPErVSiPTSskEiNEGc4V15J/mM=">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</latexit><latexit sha1_base64="9e6kolfAm5CrkWq+rkr09gAVgIY=">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</latexit>

IP
06/22/2020

IP
B2GM June 202023

Machine Stability- We sometime observe unexpected behavior of machine after maintenance day or a series ofphysics runs.

- Example: Residual optics error in LER
Just after optics tuning (2020/05/14)

Right: After physics run (2020/05/18)

IP

IP- Possible sources are orbit drift, hysteresis of magnets, etc.
Not so easy to identify the source and compensate it.
- The machine will becomes more sensitive by squeezing furthermore.
<latexit sha1_base64="eACoem4+Sxna5L8S4FhD40iwf54=">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</latexit>

06/22/2020

B2GM June 202024

Summary- We applied the CW scheme to both LER and HER.
- We have broken the KEKB’s record.
Peak luminosity = 2.23 ×1034 cm-2s-1 at 679(LER), 639(HER) mA- Major issues- Stability of the beam injection- Stable and safe operation- Beam abort due to unknown issues- Beam Background to Belle II- As for further improvement of specific luminosity
Correction of chromatic XY-coupling is an urgent issue.
- We plan to try further beta-squeezing (1mm->0.8mm) in this run.
06/22/2020

B2GM June 202025

Thank you for your kind attention.

06/22/2020

B2GM June 202026

06/22/2020

B2GM June 2020

27

Design Machine Parameters
Machine Parameters
2017/September/1

LER

HER

unit

E

4.000

7.007

GeV

I

3.6

2.6

A

1.04

mA

2,500

Number of bunches
Bunch Current

1.44
3,016.315

Circumferenceεx/εy3.2(1.9)/8.64(2.8)

4.6(4.4)/12.9(1.5)

Coupling

0.27

0.28

βx*/βy*32/0.27

25/0.30
83

Crossing angle

nm/pm():zero current
includes beam-beam

mm
mrad

αp

3.20x10-4

4.55x10-4σδ

7.92(7.53)x10-4

6.37(6.30)x10-4

Vc

9.4

15.0

MV

σz

6(4.7)

5(4.9)mm

νs-0.0245-0.0280

νx/νy44.53/46.57

45.53/43.57

U0

1.76

2.43

MeV
msec

τx,y/τs45.7/22.8

58.0/29.0ξx/ξy

0.0028/0.0881

0.0012/0.0807

Luminosity

06/22/2020

m

8x1035

B2GM June 2020():zero current():zero current

cm-2s-1

28

Low-Z Collimator Development

T. Ishibashi- Four collimator heads were damaged in total so far.
- We have used tungsten or tantalum for materials of the tip.

Bonding test

- Low-Z (Low atomic number materials) collimator is under development to reduce

Bonding test

damage by abnormal beam hit.

with a brazing is ongoing, and it was succeeded for a 100 mm sample in the length for a mockup.

- Tip of Carbon will be applied to one of vertical collimator

longitudinal length of the tip is ~ 60 mm because of the tapered geometry.

ng
test fortest
a 150
samplewas succeeded
for notfor
themockupbut ina smallsample,and weʼrewith amm
brazing
is ongoing,
and it was succeededa 100
mm sample
the length
for a mockup.
• Bondingactuallongitudinallengththe tip is ~ 60 mm
of the tapered geometry.
• Thethewhetherlongertip canbe of
manufactured
so because
far.
• The bonding test for a 150 mm sample was succeeded for not the mockup but a small sample, and weʼre(D06V1) in the next run.

not sure whether the longer tip can be manufactured so far.

Bonding test

100 mm

100 mm

150
mm
150
mm

5

06/22/2020

5

B2GM June 202029

−2 −1−1−2
22Specific luminosity Lsp
sp [cm s /mA ]Specific Luminosity
8.00
8.00
7.00
7.00
6.00
6.00
5.00
5.00
4.00
4.00
3.00
3.00

2019c No Crab Waist
2020a CW(LER/HER)=40/0%
2020a CW(LER/HER)=60/0%
2020b CW(LER/HER)=60/0%(V-angle)

2.00
2.00

2020b CW(LER/HER)=60/40%
2020b CW(LER/HER)=60/40% (HER H-angle)

2019c
2020ab2020b CW(LER/HER)=60/40% (off-resonance)

1.00
1.00

2020b CW(LER/HER)=80/40% (High Emittance)
2020b CW(LER/HER)=80/40% (High Emittance,nb=978,off-resonance)
2020b CW(LER/HER)=80/40% (LER ChXYCC)

0.00
0.00
0.00
0.00

0.10
0.10

0.20
0.20

0.30
0.30

0.40

0.50

22

IIee++ × Iee−− [mA ]- The colors and labels show our many trials to improve the machine performance.
- My personal impression is that it’s not so easy to judge whether a trial is effective or not,because as I mentioned, the machine status seems to be depending on other unknown parameters also.
06/22/2020

B2GM June 202030

Adjustment of anti-solenoid field of QCS (ESL/ESR)- Tried to correct to ESL/ESR field strength based on field measurement results.
- No improvement in luminosity performance, and the machine seems to be unstable.
- It seems
that impact
on beamopticsis considerably large.
Integralsolenoid
fieldof ESL,
ESR1- Need more systematic study after preparing a remote control system for ESL/SER.

ESL/ESR

Movement of Support table by EMF 䠇0.34 mm

N. Ouchi

QC1LP/LE are located at 2.82 mm far with respect tothe design position from IP, and QC1LP/LE are 1.19
020/06/02
QCS-Opticsᡴྜ䛫mm.

06/22/2020

䠇0.25 mm
Positions of ESL and ESR1 aresame from the mechanical1
design.

B2GM June 202031

Injection Tuning- Injection tuning is one of the most difficult part.
- The performance is very sensitive to many parameters including the injector condition.
- Reproducibility is not so good, we need frequent tuning to keep injection performance.
- Example:
Shift report by Y. Funakoshi
Transverse injection oscillation observed in 06/08 and 06/10
Injection tuning HER

Even the machine setting isalmost same (we believe),the behavior of injected beamis quite different and the injection
efficient is poor at 06/08.

Smearing of horizontal oscillation is very fast.
This is quite unusual. There were unusually large
nonlinear components?

2020/6/8 swing

06/22/2020

B2GM June 2020

Today’s smearing speed is usual.

2020/6/10 swing

32

Simulation on CW
Beam distribution for various CW ratios (β*y = 1 mm)

K. OideLER•

06/22/2020

Same contours for all CW ratios.
B2GM June 202033

Beam Aborts- Local XY-coupling correction- Abort dye to abnormal orbit- Troubles- XY-coupling correction and beam size
- Fill pattern- difficuluty in optics tuning after shutdown- Tuevey on radiation activayion- H angle and SR- High Emittance- Injection BG and #of Bunch- Fast Ibump FB and Quench- ESL/ESR adjustment- Off resonance- Difficukuty in Beta-Squeezing- Injection Tuning- Injection Kicker rotation- Beam Aborts task force.
- Rotable sextupole and synchro beta emittance

06/22/2020

B2GM June 2020

34

Items- 02/27 Start operation -> Vacuum scrubinng- 03/04 Start collision with by*=2mm- 03/09 beta squeezing -> by*=1mm- 03/16 LER CW 0->40%- 03/24 LER CW 40->60%- 04/20-23 Cabling work for HER CW- 04/24 HER CW 0 -> 40%- 05/11-14 Off-momentum- 05/15 back to on-momentum and H-angle correction- 05/25 QCS quench due to Fast iBump FB- 06/01 LER CW 60% -> 80%, Restore H-angle- 06/02 ESL/ESR adjustment- 06/05 Rotatable sextupole

06/22/2020

B2GM June 202035

Beam-Beam Parameters

Definition of beam-beam parameter (here)⇠y± (Ib⌥ ) =<latexit sha1_base64="wvcFFGdbImOHcTI4mAZ8Y7umOSg=">AAACqHichVFNTxRBEH2MirAKrHoh8bJhgwEOmxouGhMTIhdJPCzgshgGJz1D79JhvjLTu3GdzB/wD3jwpIkxxJ/hxRsnEvcnEI6QePFgzewkRghSk+l+9bpe9etuJ/JUoomGY8aNm7fGb09MVu7cnZqeqd67v5WEvdiVLTf0wnjbEYn0VCBbWmlPbkexFL7jybZzsJqvt/syTlQYvNKDSO76ohuojnKFZsqurlpvlZ0OrMjPFtbs1LH8KFt8ZnVi4abLshbb0nKkFmXJm6UstbrC94XNaW0tH7OXdrVODSqidhmYJaijjGZY/QoLewjhogcfEgE0Yw8CCX87MEGImNtFylzMSBXrEhkqrO1xleQKwewBj13Odko24DzvmRRql3fx+I9ZWcM8HdMhndEP+kYn9PvKXmnRI/cy4NkZaWVkz7yf3fx1rcrnWWP/r+q/njU6eFJ4Vew9Kpj8FO5I33/34Wzz6cZ8+og+0yn7/0RD+s4nCPrn7pd1ufERFX4A8+J1XwZbyw2TGuY61Veel08xgYeYwwLf92Os4AWaaPG+hzjCTwyNJaNptI3Xo1JjrNQ8wD9hOH8A2H2k8w==</latexit>
sha1_base64="aGuajfXQpYrHpK1Ko+1e6JkVztc=">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</latexit>
sha1_base64="sz6uFCCk4n3nTtU8tu4VJfLfoUQ=">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</latexit><latexit sha1_base64="tKUbPLMXRroqTqQvmGOsJPelKLQ=">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</latexit>
sha1_base64="O7Ic6lbwXThWiNJ7cqctqG9hXeE=">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</latexit>
sha1_base64="1tLFNG8i2cLunNLorVozY2Yph70=">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</latexit>

06/22/2020⇠y+ + ⇠y2

p⇠y+ ⇠yB2GM June 2020⇤
2ere y±L± I±

36

Specific Luminosity

We need energy correction.
off-resonance(not corrected)

H-angle(HER)• 2020abのcrab waistありではバンチ電流が⾼くてもspecific luminosityは横ばいで推移している。2020b crab waistなしでのspecific luminosityが
2019cと⽐べ
て低いので
、crab
waistありでのspecific luminosityは調整により今後もっと⾼くなる可能性あり。
• Phase-3 2020abのビームドーズはLER: 238 Ah、HER:199 Ah。D06アーク部のdp/dIが⾼い。今のところメンテナンス⽇に実施したNEG活性化の効果は⾒られない。
06/22/2020

B2GM June 202037

All Abort Events in 2020a,b

Beam-related Aborts

April

May

April
06/22/2020

B2GM June 2020

May

Next page explain.

First vertical oscillation maybe cause one side kicker.
K1oscillation
Injection
or K2
Injection
oscillation
After 3 turn
After 2 turn0 turnLER horizontal

tical

After 2 turn

After 3 turn

Oscillation is a part of bunch train
After 16 turn

After 5 turn

Oscillation is smaller
06/22/2020

After 20 turn

After about 60 turn

After 6 turn
Oscillation is bigger again.
But not next injection timing.
Because of relevance monitor location
and beam phase?
B2GM June 2020

39

Status of Operation- We have broken the KEKB’s record! (2.108 x 1034 cm-2s-1)- Peak luminosity = 2.23×1034 cm-2s-1 at 679(LER), 639(HER) mA

06/22/2020

B2GM June 202040

06/22/2020

B2GM June 202041