Ring commissioning
2015.2.24
SuperKEKB Review
Y. Funakoshi for the SuperKEKB
commissioning group and IP orbit FB groupInjection time (question by F.
Zimmerman to Kamitani-san)• InjecFon Fme– Linac beam charge: 1nC– RepeFFon rate: 50Hz
– To accumulate 1A, it takes about 5 min.
– In Kamitani‐san’s talk, he menFoned e+ charge of 0.66nC/
bunch at the end of Linac. In this case, it takes about 2.5
min. to store 1A in phase 1.

• Actual injecFon Fme depends on the injecFon
eﬃciency and the beam lifeFme.
• At KEKB, a typical injecFon Fme for storing theoperaFon beam current (~1.0A e‐, ~1.6A e+) was~30min at 50Hz (sum of e‐ and e+ injecFon).

Beam lifetime
KEKB (design)

KEKB (opera1on)

SuperKEKB Design

LER

HER

LER

HER

LER

HER

RadiaFve
Bhabha

21.3h

9.0h

6.6h

4.5h

28min.

20min.

Beam‐gas

45ha)

45ha)

24.5min.b)

46min. b)

Touschek

10h‐

10min.

10min.

Total

5.9h

7.4h

~133min.

~200min.

6min.

6min.

Beam
current

2.6A

1.1A

1.6A

1.1A

3.6A

2.6A

Loss Rate

0.12mA/s

0.04mA/s

0.23mA/s

0.11mA/s

10mA/s
7.2mA/s
4nC@25Hz 2.9nC@25Hza) Bremsstrahlungb) Coulomb sca^ering, sensiFve to collimator se_ng

As for loss rate, beam loss accompanied with the beam injecFon should be added.

Contents• Update of commissioning scenario• OperaFon tools• Update of dithering system for beam collision• CollaboraFon with other laboratories

Contents• Update of commissioning scenario• OperaFon tools• Update of dithering system for beam collision• CollaboraFon with other laboratories

Update of commissioning scenario• Time of commissioning– Phase 1: start from Jan.‐Mar. 2016
– Damping ring commissioning: start before phase 2– Phase 2: start from spring 2017?

• Period of commissioning– Damping ring commissioning• 3 weeks (old esFmaFon) ‐> ~3 months (recent more realisFc
esFmaFon)• More precise consideraFon of each step
– Beast study• Emi^ance control bump system will be required someFme in phase 1.
• We have discussing with Belle II group on the slow control system.
– Which kinds of informaFon are needed on both sides as the EPICS records.
» How fast? and Time preciseness of the data?

• Belle II people wanted to know the history of vacuum pressure change
from the beginning of KEKB commissioning.
• Required machine Fme for Beast: ~ 1 week (phase 1), ~2 weeks(phase 2)

SuperKEKB Commissioning Meeting2011.11.08 Kikuchi, M.

DR Commissioning•LTR commissioning
2 days•BPM commission•First turn
1 day
•COD meas. and correcFon 2 day•BPM commission•OpFcs meas.
2 days•RTL commissioning
2 days•InjecFon to LER•25 Hz operaFon•SR commission•Vacuum scrubbing~14 days~ 9 days~ 3 weeks
by wishful thinking

M. KikuchiCommissioning phase 1 (updated) (~5 months)• Machine condiFon– No QCS, No solenoid (no Belle II), No beam collision• Tuning items (We assume ~1A beam current)– Linac tuning (if necessary)– Basic commissioning of machine (~ 1.5 month)• InjecFon tuning, Hardware check and bug ﬁx, sooware bug ﬁx– Vacuum scrubbing (>~3 months) <‐ important goal of Phase1• Belle II people request enough vacuum scrubbing in this stage (before
Belle II roll‐in). At least one month with beam currents of 0.5 ~ 1 A.

– Detector beam background• Study with Beast detectors, check of collimator system (two new‐typecollimators in LER)

– For beam background machine study, emi^ance control bump system should
be ready to be used someFme in phase 1.

– Some opFcs tuning• With day‐1 opFcs• Low emi^ance tuning w/o Belle‐II solenoid– Study of beam instability (FII, e‐cloud, TMC)
• Tuning on bunch‐by‐bunch feedback

Emittance control bump system at
KEKB HER (iSize bump system)

We need to reconﬁgure the emi^ance control bump systems for both ring to be used
someFme in phase 1.

Phase 1 optics (HER)

Vacuum scrubbing at KEKB （HER/LER）

HER

LER

HER

LER

T. Ishibashi

Collimators location (phase 2)

Suetsugu

Vacuum pressure (LER)
KEKB commissioning phase

Commissioning phase 2 (~5 months)• Machine condiFon– w/ QCS, w/ Belle II (w/o VXD),TOP detectors parFally installed, fullaccelerator tuning, no physics experiment• Tuning items– OpFcs tuning••••

TentaFve target values of IP beta’s: βx*: x4, βy*: x8
OpFcs tuning with QCS and Belle II solenoid
Low emi^ance tuning w/ Belle II solenoid
OpFcs tuning w/ beam collision– Detector beam background• Study with Belle II detector, test of conFnuous injecFon (BEAST)– Increase of beam currents (instability, RF power, vacuum issues)• Detector background may possibly give some restricFon.
• ConFnue upgrade for RF system (support ~70% of design beam currents)– Beam collision tuning• Orbit feedback (fast feedback, dithering system)• Collision tuning w/ “Nano‐Beam” scheme– Luminosity tuning• Tuning knobs (x‐y coupling at IP etc.)• Target luminosity: 1 x 1034 cm‐2 s‐1 (design of KEKB)

Luminosity prospect in phase 2• Three parameters to determine the luminosity– Beam currents• RF system can support 70% of design currents.
• We experienced many troubles to increase the beam currents at KEKB.

– Beam‐beam parameters• Our experience is that the beam‐beam parameters were increased very slowly
by the many trial‐and‐errors most of which were unsuccessful.
• “Nano‐beam scheme” is a new scheme. Maybe we will need a lots of trial‐and‐errors before we ﬁnd eﬀecFve tuning methods with this scheme.

– IP beta funcFons• There is big uncertainty as to how low values of IP beta funcFons in phase 2.
• I think that we have to make many eﬀorts to squeeze the beta funcFons bymaking opFcs correcFons (not easy task).
• We may need hard Fme of many years unFl we approach the design IP beta
funcFons.

• The target luminosity in phase 2 is 1x1034 cm‐2s‐1.

– There is big uncertainty whether we can achieve this luminosity.
– My feeling is that exceeding the KEKB record luminosity (2.1 x1034
cm‐2s‐1) in phase 2 is very diﬃcult, although it is worthwhile tochallenge of course.

Detuned Optics (4x8)
Example of machine parameters for 1034 cm-2s-1

βx*: x4, βy*: x8, x-y coupling =2 %, ξy ~ 0.025, ILER = 1 A.
17

To do list for commissioning
scenario• More concrete plan of each step

– We have started discussion also for damping ring
– Procedures of opFcs correcFons in main ring andother tools related to the beam opFcs– Belle II and Beast related issues• Tools for collimator control• OperaFon energy in phase 2• Requirement to Belle II in phase 2• Beam operaFon mode from the viewpoint ofradiaFon safety• others…

Contents• Update of commissioning scenario• OperaFon tools• Update of dithering system for beam collision• CollaboraFon with other laboratories

Operation tools• Commissioning group asked control group to
develop operaFon tools– Alarm system• At KEKB, a member of commissioning group (K. Oide)
developed the system.

– InjecFon control system– Data logging system• KBLog system (upgrade the system used at KEKB)• CSS archiver system (backup)– Task launcher• SAD based system (KEKB) ‐> CSS based system (SuperKEKB)New Alarm system for SuperKEKB• In KEKB, we used SAD‐based alarm system.
• In SuperKEKB, we are going to construct the CSS‐based alarm system.
CSS‐based Alarm System
Used at PF‐AR from 2011 fall.  operated with no problem so far
Recently installed at Linac.
(J‐PARC is also considering to install the system.)
To apply the CSS‐based alarm system to SuperKEKB
１） We must make sure that It stably operates under the several
10 thousands alarm data points. (~25,000 in KEKB) We did load tests.
２） We must develop the sooware tools to meet our accelerator
operaFon system.
M. Iwasaki

21

CSS Alarm System

List of EPICS records
to be monitored
Alarm message/ Beep / etc..

IOC
IOC
IOC
Monitor EPICS records(monitor the severity)XML
DeﬁniFonse_ng ﬁle

IOC
IOC
IOC
Channel Access

Alarm Server
Alarm log

Alarm status

Alarm status

JMS2RDB
Write Alarm Log

Log DBShow the Current
Alarm Status

Alarm DB

Alarm status

JMS (AcFveMQ)

Alarm history

IniFal se_ng

Alarm Conﬁg Tool

Change the se_ng
parameters

Alarm Client GUI
Alarm log

User
Operator

M. Iwasaki

Test of the CSS Alarm System‐ By generaFng 50,000 test records, we did CSS alarm system load test.
 Our Alarm system can stably operates.
‐ We also measured the start up Fme of the system.
IniFal se_ng

Alarm Conﬁg Tool
10‐15minutes

Sooware IOC(50,000 record)

2.5 minutes

JMS2RDB
20‐30 seconds

Alarm Client GUI
20‐30 seconds

Total 13.5 to 18.5 minutes
8‐10 minutes if we directly edit RDB

Directly edit RDB
7minutes

Without the iniFal
parameter se_ng

Alarm Server

Sooware IOC(50,000 records)

2.5 minutes

Alarm Server
JMS2RDB
20‐30 seconds

Alarm Client GUI
20‐30 seconds
Total
3.5minutes

 To change the alarm conﬁguraFon during the operaFon, it takes 3‐4 minutes.
Plan: We develop 1) the soUware IOC to take care of the records which cannot bedirectly monitored , and 2) user interface tools.
Takuya Nakamura (Mitsubishi Electric SC) and K. Asano (KIS)

M. Iwasaki

Contents• Update of commissioning scenario• OperaFon tools• Update of dithering system for beam collision• CollaboraFon with other laboratories

Update of dithering system forbeam collision•Orbit feedback system at IP– VerFcal direcFon: system based on beam‐beam deﬂecFon (observables: BPM
orbit measurement)– Horizontal direcFon: dithering system (observables: luminosity)• For redundancy, dithering of IP verFcal oﬀset and angle can be done.

•

System layout– We will start with an analog system, which is a copy of PEP‐II system, due to alack of human resources. We will upgrade to a digital system, if necessary.
– Components• Fast luminosity monitor, lock‐in amps, coils for dithering, dither circuits (drive amps,
amplitude and phase adjustment), actuators (slow bump systems which is commonlyused for fast verFcal feedback), control system (actual feedback algorithm which will be
run in an IOC), Power supplies•

CollaboraFons– SLAC• FabricaFons of dither coils (2013) and dither circuits (2014)• SimulaFons (U. Wienands)– LAL‐Orsay• Fast luminosity monitor

Locations for the dithering coils
8 locations for the dithering coils in LER around IP.

ZDS1LPZDS2LPZDS4LPZDS3LPZDS1RPZDS2RPZDS3RPZDS4RP

Dither coils: Fabrication and field measurement

Fabrication and measurement were done last year.
All sets of dither coils have been delivered to KEK and will be installed
in LER ring in coming spring.
U. Wienands, S.D. Anderson, MFD Metrology, SLAC

Dither Circuit• An ampliﬁer board has been being fabricatedat SLAC and will be completed within thisﬁscal year.

U. Wienands and D.Brown SLAC

Simulations on dithering system• U. Wienands (SLAC) has been doing thesimulaFons by modifying a code used for PEP‐II.
• Input data for the simulaFons– Orbit dependence of the luminosity (K. Ohmi)– InformaFon on accuracy of fast luminosity
monitors (P. Bambade(LAL), S. Uehara(KEK))– QCS vibraFons in the horizontal direcFon (H.
Yamaoka)

Parameters for dither simulation
iniFalLuminosity

Ibeam [A]First milestone

Design1 x 1034 cm‐2 s‐1

1 x 1035 cm‐2 s‐1

8 x 1035 cm‐2 s‐1

LER

HER

LER

HER

LER

HER

1.0

0.8

2.7

1.95

3.6

2.6

# of bunches

2500

2500

2500

εx/εy (nm/pm)

2.2/445.2/104

3.2/51.84

4.6/77.28

3.2/8.64

4.6/12.88

βx*/βy* (mm)128/2.16

100/2.4

128/1.08

100/1.2

32/0.27

25/0.30

σx*/σy*(µm/nm)

16.8/308

22.8/500

20.2/237

21.4/305

10.1/48

10.7/59

σx*eﬀ (µm)

249

208

249

208

249

208

0.0033/0.024

0.0013/0.0257

0.0083/0.049

0.0052/0.046

0.0028/0.0881

0.0012/0.0807

ξx/ξyΔx (lumi:20%
drop)~110µm

~55µm

~10µm

Lumi. meas.

1kHz

1kHz

1kHz

accuracy~5 x 10‐3(w/ radiator)

1.3 x 10‐3(w/o radiator)< 1 x 10‐3
σx*eﬀ = σzsinφ

K. Ohmi

βy*~300µm
Swaist:1/10 βy* (~30µm)‐> Lum. Loss ~ 3.5%
Δx = Tan[2φ]*ΔsΔs=30µm ‐> Δx = =2.5µm

2.2mm
1.1mm
design, 0.3mm

1
0.95
0.9
0.85

0

20

40
60
! x (µm)

1.05

80

0.8

100

0

0.95

0.95
L/L0

0.85

0.75

0.75

0.2
!y (mm)

0.3

0.4

0.2

0.85
0.8

0.1

0.15

0.9

0.8

0

0.1
! y (µm)

2.2mm
1.1mm
design, 0.3mm

1

0.9

0.7

0.05

1.05

2.2mm
1.1mm
design, 0.3mm

1

L/L0

1.05

2.2mm
1.1mm
design, 0.3mm

L/L0

L/L0

1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0

0.7
0

0.5

1

1.5
!y’

2

2.5

1.05

2.2mm
1.1mm
design, 0.3mm

0.9

0.95

0.8
L/L0

L/L0

1

2.2mm
1.1mm
design, 0.3mm

1

0.9

0.7
0.6

0.85

0
1.05
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55

5

10
15
r1 (mrad)

0.4

20

0

2.2mm
1.1mm
design, 0.3mm

L/L0

L/L0

0.8

0.5

0

10

20
30
-1
r3 (m )

40

50

1.05
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55

1

2
3
r2 (mm)

4

5

4

5

2.2mm
1.1mm
design, 0.3mm

0

1

2
3
r4 (rad)Results（QC1R)

Fast Dither Feedback Algorithm!! 100-Hz excitation of small local orbit bump in LER!Lock-in amps measure dL/dx; used to servo dc bump tokeep beams centered (dL/dx ! 0). Integrating feedback.
!Simulator extends Gierman’s IPSim03 code for PEP-II:• 6-d luminosity model for SuperKEKB• orbit vibrations from IR quads or similar (modal spectrum)• counting noise of luminosity monitor• adaptive servoing of key parameters (", dither, lock-in gain)• can dither in all planes (plan for X plane only so far)Integrated
amplitude(> 1Hz) ~< 0.1 µm
also seenin simulator!Many effects seen at PEP-II

ditherandsizes
andlock-ingains up• lock-ups, necessity to adjustQC1RP
QC1RE
vibratecoherently
to ~50Hz.
lock-up,• “harden” the algorithm against• automatically adjust dither and lock-in gains.
U. Wienands, SLAC

#2

SimulaFon
H. Yamaoka
U.by
Wienands

Results（QC1L)

Typical IPSim Run!Commissioning config
1x1034/cm2/s!! 25 min. real time
!40 MHz lumon countrate @ 1x1034/cm2/s!1% “dither penalty”!1/3 sec cycle time
!X plane only

LER
HER

Integrated amplitude (> 1Hz) ~< 0.2 µm

U. Wienands
U. Wienands, SLAC

QC1LP and QC1LE vibrate coherently up
to ~80Hz.

"3

SimulaFon by H. Yamaoka

Orbitchangeat (black)
IP with1µm
offsetof QCS(green)magnets
Spectrum
Fast
TypicalDitherIPSimofFeedback
orbit
Run
Algorithm
andorbit
difference
La_ce : sler_1689, sher_5769

100-Hz excitation
configof small local orbit bump in LER!Commissioning!!
2/s
K1 (/m)Distance βQ [m]βIP[mm] Δψy/2π
COD@IPfor 1µm Q‐oﬀset
1x1034/cm
amps
measuredL/dx;
used
to
servo
dc bump to!Lock-infrom IP
max.
[µm]
[m]
keep
25 min.
beams
realcenteredtime(dL/dx ! 0). Integrating feedback.
!!
LER ‐1.721
0.920
2897.7 0.27
0.24995
QC1L MHz
lumon
extends
count
Gierman’s
IPSim03code‐0.734
for PEP-II:!Simulator!40(V)
HER ‐1.206 34 1.165
0.3
0.24995‐0.7682/s for5834.8
6-dluminosity
modelSuperKEKB
rate
@
1x10
/cm
•
LER ‐0.736
LER ‐1.712
0.930
2897.8 0.27
0.24995
QC1R
vibrations
from IR quads or similar (modal spectrum)• orbit“ditherpenalty”!1%(V)
HER ‐1.140
1.172
5895.0 0.3
0.24995‐0.730 HER
noise of luminosity monitor• counting
sec
cycle
time
!1/3
LER 1.721
0.920
153.0
32
0.24364
0.867
QC1L
adaptive servoing of key parameters (", dither, lock-in gain)•(H) plane
HER 1.206
310.7
0.24616
0.901
only
!X
ditherin all 1.165
planes (planfor0.3X plane
only so
far)
• can
LER

1.712

0.930

156.9

32

0.24372

0.882

HER

1.140

1.172

305.5

0.3

0.24619

0.857

QC1R
effects seen at PEP-II also seen in simulator
!Many
(H)

>
>
>
>

• lock-ups, necessity to adjust dither sizes and lock-in gains
1
V:1µm(QC1 oﬀset) <‐> ~0.7µm orbit change at IP
lock-up,!y = • “harden”#Q # IPthe
cosalgorithm!" " !$ )%against(
H:1µm (QC1 oﬀset) <‐> ~0.9µm orbit change at IP
2sin !"
automaticallyadjustditherandlock-in gains.
•
COD
U. Wienands, SLAC

Wienands
Horizontal orbit vibraFon!4"3#2 due to QC1 vibraFon U.
(~ <1Hz)~< 0.2 µm

Location of fast luminosity monitor
12m downstream of IP
Monitor detects lost positrons

As a backup, another fast luminosity monitor will be installed in 28m downstream of
HER, which detects photons from RadiaFve Bhabha sca^erings.

Proposed vacuum chamber modification
for fast luminosity monitor by LAL

Kanazawa‐san is considering the design for this chamber. Impedance issues have beenstudied by Shibata‐san. The chamber is considered to install for phase 2 operaFon.

S. Uehara

S. Uehara

Contents• Update of commissioning scenario• OperaFon tools• Update of dithering system for beam collision• CollaboraFon with other laboratories

Collaboration with otherlaboratories• Japan/US CooperaFon Program– Coordinator: M. Tobiyama• TYL‐FJPPL• Others– CollaboraFon with NLF, IHEP, BINP…

• Very important for SuperKEKB

SuperKEKB BxB FB

US-Japan collaborationCollaboration with SLAC, FNAL, BNL, Cornell ...
‒ Draws on deep experience base of US accelerator laboratories
to solve these challenging problems.
‒ Utilizes existing facilities and outstanding human resources of US
laboratories to assist in constructing SuperKEKB accelerator
components.
‒ Develops and tests SuperKEKB components using working
accelerators.

Both KEK and US laboratories have much to gain fromcollaboration.
Achieve high luminosity faster!

M. Tobiyama

SuperKEKB BxB FB

Project overview
Development and fabrication of accelerator components important tothe construction and operation of the SuperKEKB accelerator‒ Collaborate with SLAC to develop
IP collision feedback systems (4,500k JPY, to US 4,000k JPY)
 Fast luminosity monitor
 Beam collimators (7,500k JPY)
 Beam background, Machine Detector Interface
 Accelerator Physics‒ Main Ring commissioning‒ Damping Ring commissioning‒ Linac commissioning BPM for Linac/BT
 X-band deflecting cavity
 Stripline kicker for high beam current
 X-ray detector
 Flux Concentrator to increase capture efficiency of positrons Beam energy calibration using laser Compton scattering

M. Tobiyama

SuperKEKB BxB FB

Project overview (cont)

R&D on accelerator technology important for the next
generation of high luminosity colliders.
‒ Development of general purpose bunch-by-bunch feedback
systems (KEK, SLAC) (3,000k JPY, to US 2,000k JPY)
‒ Development of bunch-by-bunch X-ray beam size monitor using
coded aperture mask (KEK, Univ. Hawaii, Cornell Univ., SLAC)(8,900k JPY, to US 8,900k JPY)

‒ Development of Large Angle Beamstrahlung Monitor for collisionmonitoring (KEK, Wayne State U.) (1,100k JPY: to US 1,100k JPY)
‒ Study of electron cloud instability and its cure (KEK, SLAC,
LBNL, Cornell Univ., FNAL) (5,000k JPY)
‒ Simulation of beam-beam interactions on various accelerators(KEK, SLAC, LBNL, Cornell Univ., FNAL)
Total budget 30,000k JPY‒ R&D of injector components(KEK, SLAC) Travel 4,500k + 700k JPY
Supported by US-Japan Collaboration since FY2003M. Tobiyama

Collaboration with LAL-Orsay• Framework– CollaboraFve work in the framework of TYL‐FJPPL(Toshiko Yuasa Laboratory, France Japan ParFcle
Physics Laboratory)• LAL: P. Bambade, C. Rimbault, D. E. Khechen, D.Jehanno• KEK: S. Uehara, Y. Funakoshi, M. Iwasaki– Budget (300kYen(KEK), ~7000€(LAL) in FY 2014)• Status– Fast luminosity monitor system based on diamond
sensor has been being developed at LAL.
– To determine the locaFon of the monitor, beam loss
simulaFons have been done using SAD and GEANT4.

SuperKEKB-LNF collaboration• Proposal by the LNF scienFsts (December 2013)– 1) Feedbacks implementaFon (collaboraFon started already,Contact Person: Dr. Alessandro Drago),– 2) OpFcs studies, in parFcular the problem of the “crab waist”
sextupoles (Contact Person: Dr. Maria Enrica Biagini),– 3) LifeFmes and backgrounds studies (Contact Person: Dr.
Manuela Boscolo),– 4) Rings injecFon studies (Contact Person: Dr. Susanna
Guiducci).

• Status– Things seem to have been delayed in Director General/Trustee‐level communicaFon between both labs.
– We have received oﬃcial endorsement from a Trustee (Okada‐san) and have begun discussing and wriFng a rough drao ofcollaboraFon agreement.

7. Future plan

Collaboration with Frascati!!"#$%&'#(!%)%'*+&+!,-!'%./#!),)'&)#%0&$*!1)(#0!%)!
&)$#0)%2,)%'!/,''%3,0%2,)!40,50%6!

!!!!!7!8,0)#''!9)&:;<!";!=%5%)!>?6%(@AB8C!
• Proposal from LNF (Dec. 2013)• Four possible collaboraFon topics have been propsed:!!!!!7!=DE8<!F;!8%&!
• 1) Feedbacks implementaFon (collaboraFon started already, Contact Person:!!!!!7!GHIA<!F;!JK%)5!
Dr. Alessandro Drago)!!!!!7!LIL<!I;!M,0#+$N!E;!O,0&$%N!L;!PK6&N!F;!PK)&+K&N!L;!P&(#N!H;!
• 2) OpFcs studies, in parFcular the problem of the “crab waist” sextupoles(Contact Person: Dr. Maria Enrica Biagini)=15&6,$,N!";!JK,1N!#$/;!
• 3) LifeFmes and backgrounds studies (Contact Person: Dr. Manuela Boscolo)!!8,''%3,0%2,)!Q&$K!8IA8RM88S##!$#%6+!
• 4) Rings injecFon studies (Contact Person: Dr. Susanna Guiducci)• Status!!H&5KS40&,0&$*!$%+T+<!

– Since the proposal was oﬀered to KEK, things have been delayed in!!!!!7!U',3%'!,0!',/%'!/,00#/2,)!+/K#6#+!-,0!'%V;!),)'&);!
Director General/Trustee‐level communicaFon between both labs.
!!!!!7!=8!/,64#)+%2,)!+/K#6#+!
– Recently, we have received an oﬃcial endorsement from the trustee,
Okada‐san, and have begun discussing and wriFng a rough drao of!!!!!7!?#V#0!1)(#0+$%)(!3#%6S3#%6!4K*+&/+!-,0!)%),S3#%6!+/K#6#!
collaboraFon agreement.
!!!!!7!O,0#!3#)/K6%0T!+$1(&#+!-,0!=E"!
!!!!!7!W!W!

!!X#/,66#)(%2,)+!%0#!Q#'/,6#Y!
46

D. Zhou in this MAC

Remarks• The collaboraFve works with other laboratories
have been very helpful for the construcFon ofSuperKEKB.
• The beam commissioning will start next year andthe collaboraFons will be increasingly important,since SuperKEKB is very diﬃcult machine forachieving the design performance.
• RecommendaFons from the commi^ee members
are very important as the past recommendaFons.

Congratulations on the 20th anniversary of
the KEKB Accelerator Review Committee!!!
The KEKB accelerator members really appreciate
your perFnent recommendaFons that we have got
a lot of beneﬁt from and the conFnuous encouragements
and supports.
We wish to celebrate a great success of SuperKEKB
in the 30th anniversary of the review commi^ee!

backup slides

SuperKEKB requirements (tentaFve)

09:50 Injector commissioning and issues 30'
Speaker: Masanori Satoh (KEK)

KEKB(e+/e‐)

SuperKEKB(e+/e‐)

Charge [nC]

1/1

4/5

Normalizedemi^ance[µm]2100/300

100/50 (H)20/20 (V)