SuperKEKB MR Status
and Plans
T. Kobayashi
Acc. Lab , KEK

B2GM

Oct. 21, 2019

Outline• Brief Summary of Phase-3 2019 Spring (Mar.~Jun)
Remarkable Results• Concerned Issues and Troubles• Improvements for Quick Abort Kicker Firing• Commissioning Plans for Next Runs (2019 Oct. ~ 2020 June)• Summary

B2GM

Oct. 21, 2019

Brief Summary of Phase-3, 2019 Spring
Y. Ohnishi, ARC, July 8, 201994

Peak luminosity at Phase 3
Spring Run 2019

Peak luminosity at Ph

High current sturdy
w/o Physics
Spring
RunRun2019
β*=2mm
β*=8mm

β*=3mmMarch 11
Beam stored
in HER.

March 13
Beam stored
in LER.

HER IbJune 28940 mAin HERLER IbJune 28830 mAin LER

Recovery fromfire trouble in Linac

March 25
Collision started.

Luminosity

B2GM

Oct. 21, 2019

June 9
QCS/ESR Quench,
PXD damaged

July 1
1.23x1034

Brief Summary
review of Phase-3
2019a,2019b Spring
Briefof Phase-3,• Ref. : History of peak luminosity (e+/e- colliders)

Achieved Luminosity

Design value

Now we are here(End of Phase-3 2019b)
SuperKEKBBPAC 2019/10/27 KEK

B2GM

Oct. 21, 20195• Max. recorded luminosity per day was ~300 pb-1/day.
-1 were•Recorded
integrated
luminosity
of
~6.5
fb
Brief Summary of Phase-3, 2019 Spring
accumulated-1.
• Delivered
integrated
luminosity~9.6
fb
Integrated Luminosity
Trends of daily integrated luminosity ad total integrated luminosity
2019a,b2019a,b-1/day.
Max. recorded luminosity per
day
was
~300
pb
BPAC 2019/10/27 KEK
Recorded integrated luminosity of ~6.5 fb-1 were accumulated.

Delivered integrated luminosity ~9.6 fb-1.
B2GM

Oct. 21, 20198

Brief Summary of Phase-3, 2019 Spring
Brief review of Phase-3 2019a, b

Achievedβy**βy* [m]• Ref. : History of Ey (e+/e- colliders)
SPEAR

VEPP-2000

LEP,BEPCPETRA
TRISTANPEP-II

BEPC-IICESR-C

SuperKEKB

CESR
DAFNE
mm-world

Fcc-eeKEKB
Now we are here(End of Phase-3
Now we 2019b)
are here

CEPC(End of Phase-3 2019b)
Pm-world
Design value

BPAC 2019/10/27 KEK

B2GM

Oct. 21, 20196

Brief Summary of Phase-3, 2019 Spring
Demonstration of the nano-beam scheme for βy* = 2 mm

Y. Ohnishi, Y. Funakoshi

ξy± : Beam-Beam Param.

Phase-3
2019
SpringPhase-2

The specific luminosity is increased by squeezing βy*.
It is well proportional to 1/βy* at a constant bunch current.
The beam-beam parameter can be also kept
while squeezing βy*.

B2GMOct. 21, 2019

Brief Summary of Phase-3, 2019 Spring
Continuous injections started from May, 2019 in both LER and HER
The injection BG was drastically reduced by the elaborate tuning of collimatorsand new injection tuning method, then, continuous injection mode was realized.
This
Contributed to higher integrated luminosity.
Efficiency was increased by ~50% .

Decay mode run

Continuous injection mode run

B2GMOct. 21, 2019

Concerned Issues and Troubles

B2GM

Oct. 21, 2019

Beam-Beam Blow-Up<latexit sha1_base64="g7sbIDct0a1aDhEY9Igg5Bws0pk=">AAACdXichVHLLgRBFD3T3uMxjY1EJBODiMW4LRIikQgbS69B4jHpboXO9CvdNZOMCR/gByzYkCDiM2z8gIVPEEsSGwt3ejoRBLdSVadO3XPrVJXh21YoiR4TSl19Q2NTc0uyta29I6V2dq2GXjEwRc70bC9YN/RQ2JYrctKStlj3A6E7hi3WjMJcdX+tJILQ8twVWfbFlqPvudauZeqSqbyqbhpC6vny9sj02JHjpNN5NUNZiiL9E2gxyCCOBU+9xiZ24MFEEQ4EXEjGNnSE3DaggeAzt4UKcwEjK9oXOESStUXOEpyhM1vgcY9XGzHr8rpaM4zUJp9icw9YmcYgPdANvdA93dITvf9aqxLVqHop82zUtMLPp457lt/+VTk8S+x/qv70LLGLycirxd79iKnewqzpSwcnL8tTS4OVIbqgZ/Z/To90xzdwS6/m5aJYOkWSP0D7/tw/wepYVqOstjiemZmNv6IZvejHML/3BGYwjwXk+NwSznCJq8Sb0qcMKEO1VCURa7rxJZTRD6mDj6Y=</latexit>⇤
y = 2 mm

Y. Ohnishi, ARC, July 8, 2019

I = 700 mA for LER and HER

Beam-Beam blow-up was observed, andalso flip-flop phenomena in beam sizes.

L=1034

Collision<latexit sha1_base64="oPnQoct7stNJJ/kFUef/2bhHgd0=">AAACf3ichVHLSiNBFD1pdYxRJ5lxI7ppDI7iQHNbhBkFQXTj0ldUME7o7iljYb/o7gRiiLj2B1y4UpgRcaH/4MYfcOEniEsFNy686TQMMzJ6i6o6deqeW6eqTN+WYUR0m1La2js+dKa7Mt09vR+zuU+fV0OvEliiYHm2F6ybRihs6YpCJCNbrPuBMBzTFmvmzlxzf60qglB67kpU88WmY5RduSUtI2KqlBsohrLsGKV67Wvjx9g0aRPje0WnojqqWsrlSaM41NdAT0AeSSx4uVMU8RMeLFTgQMBFxNiGgZDbBnQQfOY2UWcuYCTjfYEGMqytcJbgDIPZHR7LvNpIWJfXzZphrLb4FJt7wEoVw3RDZ/RA13ROd/T831r1uEbTS41ns6UVfil70L/89K7K4TnC9h/Vm54jbOF77FWydz9mmrewWvrq7uHD8tTScP0LndA9+z+mW7riG7jVR+vXolg6QoY/QP/3uV+D1XFNJ01fnMjPzCZfkcYghjDK7/0NM5jHAgp87j5+4wKXSkoZUTSFWqlKKtH04a9QJl8AehGSJg==</latexit><latexit sha1_base64="Z+rz2Xl6b8K6pkRU4ne6msdkrb8=">AAACf3ichVHLShxBFD3TvidGR92IbhoHjQhpbvvABwiimyx9jQqODt2dcizsF909A+OgZJ0fcOFKQUWySP7BjT/gwk8ILhXcuPBOT4OoJN6iqk6duufWqSrTt2UYEd2mlIbGpuaW1rb0p/bPHZ2Zru610CsFlshZnu0FG6YRClu6IhfJyBYbfiAMx7TFurm3UNtfL4sglJ67GlV8seUYRVfuSMuImCpk+vKhLDpGoVr5erA9Mkva2MRh3impjqoWMlnSKA71PdATkEUSi17mAnl8hwcLJTgQcBExtmEg5LYJHQSfuS1UmQsYyXhf4ABp1pY4S3CGwewej0VebSasy+tazTBWW3yKzT1gpYpBuqFLuqdr+kV/6emftapxjZqXCs9mXSv8QufP3pXHD1UOzxF2X1T/9RxhB1OxV8ne/Zip3cKq68v7R/crM8uD1SE6pTv2f0K3dMU3cMsP1tmSWD5Gmj9Af/vc78HaqKaTpi+NZ+fmk69oRT8GMMzvPYk5fMMicnzuD5zjN/4oKeWLoilUT1VSiaYHr0KZfgaCQJIq</latexit>⇤
y+ = 0.42 µm⇤
y= 0.35 µm

Non-collision
LER<latexit sha1_base64="QAvLJm3WGp2T7jA8ITWsuqBWrY4=">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</latexit>⇤
y+ = 0.11 µm

Non-collision

The blow-up in the LER is
significantly larger than the HER.

HER

Continuous Injection Mode (CIM)

Luminosity was improvedby increasing vertical emittance in HER
However, beam size was unstable.
It seems like flip-flopping between beam sizes of
HER and LER.
These phenomena are not yet understood well.
Detailed study will be necessary.
B2GM

Oct. 21, 2019

injection parameters.
• A problem is that the quiet situation did not continue.
• Background bursts by injection beams were also observed.
• Recent
Bursts observed in LER
In the 2019 spring
run studies found that theof Phase-3
2019a, bburstsChallenges
in LER were likely
toBurstsat the timing of a klystronInjection spikes in the LER occur• High(1) – fromdown
or backgroundof a mis-triggeringof LER stored beam
Background from injection beams was decreasedbyadjusting beam orbits,
energy• Mainbackgroundsourcein LER storage mode was thepulsemagnets
at
Linac
spreads, emittances and injection parameters. However, the quiet situation did not• Butbeam-gas
it was not Coulomb
always. scattering from the sotored beam.
continue.

Beam Background Issue• Vacuum scrubbing in LER was proceeding steadily, but t• wereThealsocauseof theseburstshave
Background bursts by injection beams
observed.
pressure
was stillhigh,especially compared to Base
HER.
From recent studies, it was found that thein LER
likely to occuryet.
at thenotbursts
been
fullywere
understood•
Numberofbeamcollimators
for LER was insufficient.
timing of a klystron down or of a mis-triggering of pulse magnets at Linac.
But it was not always. The cause of these bursts haveBelle
notII been
fully understood yet.
Background summary
BPAC 2019/10/27 KEK

Ohnishi

Vacuum scrubbing at LER
15

Storage beam background in the LER
Main background source in LER storage mode was the beam-gas Coulomb
scattering from the stored beam.
Vacuum scrubbing in LER was proceeding steadily, but the pressure was still high,especially compared to HER.
Number of collimators for LER was insufficient.

Background studies should be continued.
Optimization of collimator settings are important.
BPAC 2019/10/27 KEK
and additional collimators are needed.
And also more vacuum scrubbing in the LER is needed.
B2GM

Oct. 21, 201913

QCS Quench in Spring Operation 2019
N. Ohuchi, ARC, July 8, 2019

During the Spring operation 2019, 6 magnet quench events occurred.
– 3 events are beam induced quench (due to beam loss).
– 3 events are due to QC2LE power supply failure. SVD had serious damaged.

ration and quench
Phase-3

Quenched Magnet by Beamr

Linac trouble

QCS operation and quench

gnet quench data (May 28th, 2019)

he origin of the trouble was QC2LE power supply failure (IPM trouble).
VD had a serious damage.

magnets by beams

As one of the countermeasures to avoid QCS quench
due to steered beams,
shortening the delay time to abort kicker firing isimportant,

the QC1 magnets and the accompanying correctors.
e power supply trouble.
et quench and the beam operation, the kicker trigger signal
ger system was upgraded with the sampling time of 1 Ps.

rKEKB Review 201908

→ Abort trigger system was improved in this summer.
Details will be presented later.

5
SuperKEKB Review 20196
From the report by Y. Arimoto

B2GM

Oct. 21, 2019

ProtectQCS
Shields
againsQuenchoperation and quench
N. Ohuchi, ARC, July 8, 2019

Future• The Issue
countermeasure to the quenches of the QC1 magnets has
been
proposed toassemble
W QC1
alloymagnets
shield on
Thecountermeasure
to thequenchestheof thehas thebeenincoming
proposed
to beamassemblethe W
on the incoming beam pipes by the QCS group.
pipes
byalloytheshield
QCS group.

– TheQCS
waitingisfor
the beam
results
including resultsthese shields
concerningfor– Thegroup
QCS isgroup
waiting
forsimulation
the beamsimulation
contained
these
the effectivityof themagnet quench
protection.
shields
concerning
for theeffectivity of the magnet quench protection.

QCS-R
QCS-R

QCS-L
QCS-L

e-

e+

2019/07/08

SuperKEKB Review 2019

B2GM

Oct. 21, 20198

Challenges
ofPhase-3
2019a,b
IR Chamber Trouble (1)• Troublesofbellows
chamberatbackwardsideofIP- Troubles of bellows chamber at backward side of IP (1) Heating of bellows

The HER bellows was heated up: The temperature increased to ~50°C at ~ 600 mA.
•
The
HER
bellows
washeated
up,
and
was
a
concernat
It was very concerned for high currents.

high currents: ~50qC at ~ 600 mA Temperaturesofbellows
Bellows
Temperatures ofat IP at IP
Bellowsat
at IP
Bellows
IP

Challenges of Phase-3 2019a, b• Troubles of bellows chamber at backward side of IP• thisCountermeasure
In
Summerat
Work(2)
DamageQC1L BPM connectors
QCSL
was
QCSL• wasretracted, retracted and the bellows chamber was
•
Two
QC1L
BPMs
(Downside)and the replaced
bellows chamber
wasthisreplaced
during shutdown.
this summer shutdown.
duringsummerwere unusable due toThree
RF-shield
fingers
insidethe bellows were dislocated.
(1)
Heatingofbellows
disconnections cables (Reported
The cause of the finger-dislocation is not clear.

• lastThree
RF-shield fingers inside theRF-shield fingers
inBPAC).
Thewasreplaceda spare.
bellows
werewith
dislocated.
• bellows
TDR
measurementssuggested
No abnormal
wasseenreplaced
during this work.
•damage
Themovement
bellows
wasto a spare.
at the SMA connectors.
Tobiyama• No abnormal movement
was seen
BPAC 2019/10/27 KEK
during work, and the cause is not clear.
B2GM

Oct. 21, 201923

IR Chamber Trouble (2)- Troubles of bellows chamber at backward side of IP Damage at QC1L BPM connectors
Two QC1L BPMs (Downside) were unusable due todisconnections of cables in the operation (Reported
in last BPAC).
TDR measurements suggested damage at the SMA
connectors.

M. Tobiyama

In this Summer Work
It is found that downside BPM connectors
were broken.
→ They were replaced to improved ones.
The cabling paths were changed to upside to
avoid tensions on connectors during various
works in the detector.
B2GM

Oct. 21, 2019

Improvementsof Shortening Delay time of Abort Trigger
for Quick Abort Kicker Firing

B2GM

Oct. 21, 2019

QCS Quench in Spring Operation 2019
During the Spring operation 2019, 6 magnet quench events occurred.

on andquench– 3 eventsare due to QC2LE power supply failure. SVD had serious damaged.
– 3 events are beam induced quench (due to beam loss).
PS Failure
QCS&
Beam Loss

Coil Volt. (dI/dt)
Coil Current(Slow Down)

Beam Abort,and Quench

3 ms

When the magnet PS was failed (I/L worked),
the PS slow down started.
After ~3 ms, the beam was aborted by the loss monitor
signal, then the steered beam hit and QCS was quenched.
During this 3 ms, the beam orbit was deviated.
One of the reason of the delay (~3ms) to the abort timing:
Abort request signal from PS system of the magnet wasvery slow because it was transmitted via relay switches of
PLC modules ( it took ~60 ms ).

BPM

Improved in this summer:
DiamondDetector

10 ms

In the improved system, the abort request signal istransmitted directly from FPGA in the PS system as opticalsignal. As the result, the delay was reduced to ~10µs,
which is ~50µs before starting slow down of PS.
From the autumn run 2019, accordingly, beams will be
immediately aborted after PS failure in ~30 µs before
beam orbits are deviated.

From the report by Y. Arimoto
B2GM

Oct. 21, 2019in the present abort system (max. ~40 Ps).
• Fast beamloss
QCS
QuenchinSpringOperation2019• ~150mAbeamout wasof 660mA
was lost
until
the
bea
• The
abortedat 30~40
Ps (3~4
turns)
afterthDuring the Spring operation 2019, 6 magnet quench events occurred.

large
beam
loss
started,which
isalmostthefastesttim•
Highradiation
dose
damagedPXD.
– 3 events are due to QC2LE power supply failure (IMP abnormal work).
in thepresent
system– 3 events are beam
inducedquench abort(due to beamloss).(max. ~40 Ps).
•
Collimator
headof
D02_V1(V-typecollimato• at~150
mA
ofafter660
loststarted.
until the(T beam=10μs) abort.
The beam was aborted
30~40 µs
(3~4out
turns)
themA
large wasbeam loss-> The delay
time
betweenthe abortrequest and
the
abort
kicker firing wasabout (max.) ~40 µs.
• Highradiation
dose
damaged
PXD.
of
IP)
was
heavily
damaged.
• ~1/3 of beam current
was lost until the
beamofabort.
•
Collimator
head
D02_V1 (V-type collimator, just upstre•Highradiation
dose
damagedPXD.
•• Collimator
Theheadbeam
loss
leadedtoQCSquench.
ofIP)
washeavily
damaged.
of D02_V1 (V-type collimator, just upstream of IP) was heavily damaged.
rev

• The
beam loss
leadedto QCSquench.
• The storedbeam
wassteeredorofblew
sud
Reduction
time lag up
to abort• The beam loss leaded to QCS quench.
The stored beam was steered or blew up suddenly!

•The
storedbeam
wassteeredor
blew
upsuddenly!
kickerfiringwillbeeffective.
Record of fast beam loss (Data Logger system)of fast Logger)
beam loss (Data Logger system)
Record of Fast BeamRecord
Loss (Dataof collimator he
DamageDamageof collimator head
Damage ofCollimator Head

Abort Trig.
~40µs
Beam Loss

Beam Loss
Start

DCCT

This collimator was
19
replaced with new one.

BPAC 2019/10/27 KEK

520 µs
B2GM

And also,
additional collimator will be
installed in winter 2019.

Oct. 21, 2019
BPAC
2019/10/27 KEK

Delays in Beam Abort System
Beam Abort Delays

failure is detected…

Devicerequests
Abort

H. Ikeda

Beam Abort
Abort
Beam
requestRequestBeam Interlock system
Processtransferring to CCR

SignalSignalsent
totoKicker
KickerBeam Dumping
System waiting
for beam gap

Kicker fired
Kicker
Fired

Trev=10μs> ~2ИsHardware dependent< ~10 Иs/(5ИV䡚ИV+(5ИV䡚ИV

All bunches
are aborted

max 10ИV

t3
t2
t4
t1
To summarize the abort request
Synchronization of the abort request signal with revolution
on the beam abort system.
in FPGA.ʁMax delay=10ʅs
Depends on the optical cable
Delay to synchronize to the abort gap(fixed delay) : 4.2ʅslength from the local control room for LER, 2.8ʅs for HER
to CCR.
Delay from CCR to kicker (400m) : 2ʅs
10ʅs for D1, D2(near Belle-II), Thyratron ON :1ʅs
Rise time for the kicker : 200ns
TheD8
23rd KEKB Accelerator Review Committee
52ʅs for D7 or

B2GM

Oct. 21, 2019

2 Abort Gaps and New Trigger System①

Abort Gap Timing
Revolution②
Fill Pattern of Train
2 x Revolution
In order to shorten the time lag to the abort kicker,(Bunch Current Monitor) 520mA, Oct. 18th 2019③
Delayed 2 x Rev.

#0

#639

④ gaps was increased to 2 in the train.
• Number of abort
improved to synchronize• Abort trigger system was⑤

Abort Request
Abort Request
synced with

with the half revolution⑥ period.

Abort Trriger#2559
Delay for Revolution

Fixed Delay

0 ～ 5 μsec

① Number of the abort gap is increased to 2 in the revolution time.
② Multiplied revolution is used to sync an abort request to the increased abort gap timing.
③ Multiplied revolution can be delayed with MR RF clock. This allows to decrease fixed delay.
④ Receive an abort request.
⑤ Synchronize the abort request to the multiplied revolution.
Wait for the abort gap timing with the digital delay. It would be very short time.
#5119 ⑥ 2019/9/27#4480

Timing chart
for improvedRevolutionabortPeriod
synchronization
Abort Gap
(T =10µs)
rev①

Abort Gap
Timing
Abort
Gap
Revolution
Revolution
CLK

Trev /2 = 5µs②

2 Rev.
x Revolution
CLK x 2

Rev. CLCK
Delayed
2 x Rev.x 2③

with Delay

Abort Request

Abort Request

④

⑤

Abort
Request
Abort
Timingsynced with

Synchronized

⑥

Abort
withTrriger
the Gap

Delay for Revolution

0 ～ 5 μsec

Fixed Delay

B2GM
21, 2019time.
① Number of the abort gap is increased
to 2 in the Oct.
revolution

S. Sasaki

Abort Trigger Synchronization with 2 Gaps
アボート同期波形
ch1：Revolution ch2：Abort request ch3：Abort trigger(Revolution delay = 0 clock, Digital Delay(TD4) = 1 clock)
Revolution Period (Trev=10µs)

Trev=10µs

Revolution CLK

Revolution CLK
Abort Request

Abort Trigger toKicker2019/9/27

Synchronization with Gaps #1

B2GM

Synchronization with Gaps #2 15(at timing of the half period)

Oct. 21, 2019

Reduction of Abort Trigger Delay
Beam Abort Delays
failure is detected…

Devicerequests
Abort

H. Ikeda

Beam Abort
Abort
Beam
requestRequestBeam Interlock system
Processtransferring to CCR> ~2ИsHardware dependent< ~10 Иs

SignalSignalsent
totoKicker
KickerBeam Dumping
System waiting
for beam gap/(5ИV䡚ИV+(5ИV䡚ИV

Kicker fired
KickerFired

All bunches
are aborted
max 10ИV

t3
t2
t4
t1
To summarize the abort request
Synchronization of the abort request signal with revolution
on the beam abort system.
5µs
in FPGA.ʁMax delay=10ʅs
Depends on the optical cable
Delay to synchronize to the abort gap(fixed delay) : 4.2ʅslength from the local control room for LER, 2.8ʅs for HER
0µs
to CCR.
Delay from CCR to kicker (400m) : 2ʅs
10ʅs for D1, D2(near Belle-II), Thyratron ON :1ʅs
Rise time for the kicker : 200ns
TheD8
23rd KEKB Accelerator Review Committee
52ʅs for D7 or

The delay will be shorten by ~10 µs (1-turn) in total.
B2GM

Oct. 21, 2019Commissioning Plan of Next Runs
(2019 Oct. ~ 2020 June)

B2GM

Oct. 21, 2019nd on 12 , December.
will end on 12 , December.
8 days ~ 2 months• 58 days ~of
2 months
Schedule
Next
Runs
th, January,
General goal • 2020a, b (Spring run) th
will
start
on
16
a, •bLuminosity(Spring
run)
will
start
on
16
,
January,
andwillgoal by the summer 2020: ~200 fb .
st, July (not yet fixed).
st
end
on
1
2019-Autumn
operation
willbedevotedto increase the peak luminosity mainly by squeezing β ,on •1 , July (not yet fixed).
and to reduce the beam
background.
•
Run
in
March
will
continue
as
long
as
the
bu
un• Peakin luminosity
March
will
continue
as
long
as
the
budgetallows.
of 2~3 x10 cm s is required from the beginning of 2020 to achieve ~200 fb by the
168 days(max.)~ 5.5 months (max.)
68 summer.
days ~ 5.5• months
Sep. 2019 ~ March 2020
-1

*

y

34

-1

2019

2019

2020
JFY2020gust
21
1ovember

September
11December
21 1

October
11 January
21
1

11

1

1

21

ummer shutdown

19c

11

21

11

November
JFY2020December
11 February
21 1
11 21March
1

21

1

11

21

12/12 9:00

10/15
MR

9/24

Linac & BT

12/13
28
Power line

1

11

MR

1/6

BT

Linac & BT
'1/24 1/31
Power line

12/13
28
Power line

Now here

Linac & BT
'1/24 1/31
Power line

3/20

700 mA stored
in QCStheboth rings
Belle,(Compressor
start)
16-20 Warming
up

2020

3/20

April
May
April
~
August2020
11 21 111 21
2020a
7-11 Belle,
QCS (Compressor start)1June
1 JFY2020
11 21

23-27 Self-inspection (in tunnel)

SCC23-27(Compressor
start)
Self-inspection(in tunnel)

SCC Aging 7-11 Belle, QCS (Compressor start)1

9-13 SCC (Compressor start)

9-13 SCC May(Compressor start)
April
June
Days
7-8
14-15
SCC
Aging
11 21 1
11 21
1
11 21

Shutdown (scheduled)

Days
Operation (scheduled)
202

202

Cooling down (SCC)

BPAC 2019/10/27
KEK
SCC
aging
B2GM

Oct. 21, 2019

1

July
11 21

1

August
11 21

1

S
1
7/1

163

MR Summer shutdo

MR2020-Spring operation will Operation (scheduled)
Linac & BT
Operation (scheduled)
163 MRbe concentrated toRefrigerator& BTupOperation(scheduled)Warming
physics run to accumulate Linac
BPAC 2019/10/27 KEK
Self-inspection(in tunnel)
Cooling down (Belle, QCS)
Refrigerator
luminosity.
Warming up
Self-inspection(in tunnel)

2020b

2020b

16-20 Warming up

2019c

Shutdown (scheduled)

3/20

1/6

BT

7-8 14-15 SCC Aging

1

March
11 21

1/16

3/20

2020a

1

February
11 21

21

12/12 9:00

1/16
MR

January
11 21

Power line work and MR Winter shutdown

Power line work and MR Winter shutdown

f-inspection (in tunnel)

start)

-2 -1

7/1

W

Warming up

38

Self-inspection (in tu

Base plan (Ey 2.0 Æ 1.0 mm during 2019c)
2019c commissioning(Oct.~Dec.)
2019 Autumnplan
Plan(Oct. ~ Dec.)• First 3 weeks are for recovery of machine and beam studies at
Ey* =Plan:
2 mm.
Base
βy* 2.0→1.0• After that,First 3 weeks are devoted for recovery of machine and beam studies at βy* = 2 mm.
• Day and swing shift of working day: machine tuning
After that,• Owl
of working
andofwholeof holiday: physics run• Machine
tuningshift
is plannedin day andday,
swing shift
working day.
• Physicsvacuum
run or vacuum
scrubbing in owl shift of working day, and whole of holiday.
scrubbing.
•
Linac
study
on
every
Wednesday(1.5
shift)*
βy will be squeezed to 1 mm by the end of November.
* down to 1 mm by the end of November.
•TheSqueezeElast week of thisy run will be machine study (reserve).
• The last week will be machine study (reserve).
Oct. ~ Dec.2019c
2019
2019
2019

October
1

BT Study

11

November
21

Linac, BT Study

1

11

December
21

1

11

21

1

Now hereMR
Owl shiftDay shift
Swing shft
Machine study

89

Physics run

70

Linac study

12

Maintenance3

E y*=2 mm

1.5 mm

1.2 mmDetuned optics

Back ground study

Vacuum scrubbing

Luminosity tuning

1.0 mmBeam-Beam performance

Machine study

Back ground study

Reserved

BPAC
2019/10/27
KEK
B2GM
Oct.
21, 2019

40

Operation plan: near term

• Base plan (Ey* 2.0 Æ 1.0 mm during 2019c)
* 2.0
2020
Spring
Plan
(Jan.
~
June)
Base plan
(
E
Æ
1.0
mm
during
2019c)y• 2020a,b commissioning plan
2020a,b commissioning
plan will be for vacuum scrubbing, mach
• Operation
Base Plan:βy* =1.0 in January•
OperationinJanuary
will
befor
vacuumscrubbing,machinestudiesandLinacstudies.
Operation in January will be devoted for vacuum scrubbing, machine studies and Linac studies.
studies andLinac studies.
Operation
after
from
will
be basically for physic
Operation after •fromFebruary will bebasically
for February
physics run with
βy*=1.0mm.
• Operation
afteronfrom
Februarywill
be basicallyforshift)
physics run.
• Linacstudy
on every
Wednesday
(1.5
Linac
study is scheduled
every Wednesday(1.5
shift)• Linac study on every WednesdayJan.
(1.5 shift)~ Mar.
2020a2020

2020

1
1

11

MR

February

11

January

BT Study

2020aJanuary21

21

Linac, BT Study
1

1

March

11

21

February
11

21

1

11

Linac, BT StudyOwl shiftDay shift
Swing shft

Machine study

26

Physics run

402

study

26

Linac study

63

cs run402

Maintenance

10

study

63

nance

10

E y*=1.0 mm
Detuned optics

E y*=1.0 mm

Luminosity tuning

Vacuum scrubbing
Detuned optics

Luminosity
BT tuning
TuningVacuum scrubbing
BT Tuning

2020b

April 2020b~ July 2020

B2GM

1

March

BPAC
KEK
Oct.2019/10/27
21, 2019

21

11

21

3.0

Expected
Luminosities
bySummer
2020
Operation plan: near term
200

1.0

for the Base Plan: βy* =1.0

• Expected luminosities in Base plan
L x E [x10 cm s ]βy*[mm]PxIA]
Beam
Current
[A]
Beam
Dose
[Ah]
Beam
dose
[Ah]
L [x10 cmI [A]s ]Int. L [fb ]E [mm]
P x[Pavs I xI[mA] I [Pa A]
*
y

34

-2 -1

sp

-1

eration plan: near term
p

3.0

*
y

31

b+

b-

-1 -1

2

Operation plan: near term
200

2000

1.0

ted luminosities in Base plan

Expectedluminosities in Base plan
Assumptions:mm]

Beam dose [Ah]P x I [Pa A]

I [A]
34
-1]
-2
-1
-150%.
Lbackground
[x10
cm
Int.
L
[fb
SimilarLlevel
as2019b,
withslightly
improvement
by
[x10
s
]
Int.
L
[fb
]
p
34 as
-2s-1]with slightly improvement-1]
Similar beam-beameffects
2019b,
Lp [x10cm
Int. Lby[fb20%.
2000
Beam background is independent of Ey*.

3.0

BPAC 2019/10/27 KEK

200

3.0

Lsp x Ey* [x1031 cm-1s-1]* [x1031-1-1
31cm
2] -1-1ss
Lspx
xβEIyb+
[x10
cm
]]
Lsp
vs
[mA
y* xI
bvsIIb+[mA22]]
vsb-b-[mA
b+IxI
43

200

Assumptions:
Similar background level as 2019b, with slightly improvement by 50%.
Similar beam-beam effects as 2019b, with slightly improvement by 20%.
Beam background is independent of Ey*.
BPAC 2019/10/27 KEK

43Assumptions:
Beam
dose
Beam
dose
[Ah][Ah][A]
I [A]1) Specific luminosity
will beI proportional
to 1/βy*.
2) Similar background level as 2019b, with slightly improvement by 50%.
3) Similar beam-beam effects as 2019b, with slightly improvement by 20%.
4) Beam background is independent of βy*.
4) Expecting vacuum scrubbing of LER during operation: decrease
2000 in dP/dI proportional to 1/BD. 5)
2000
Efficiency of integrated luminosity is 70%.
B2GM
Oct. 21, 2019

[PaA]
A]
PPx xI I[Pa• Option-1 plan (Ey* 2.0 Æ 0.8 mm during 2019
OptionPlan 2020a,for2020
SpringOperation
plan:
near
term Operation• 2019c,b commissioning
plan
* yis
* 2.0 ÆOption
Plan:
β
*
2.0→
0.8
•
E
squeezed
to
0.8
mm
2019c.
in autumn
2019 during• Option-1 plan
(
E
0.8
mm
during
2019c)yy* = 0.8 mm
•
2020a
will
start
with
E
from the KEKB review• 2019c, (recommendation
2020a, b commissioningplan
y committee)• Ey* is squeezed to 0.8 mm during 2019c.
Oct.* ~ Dec.
2019
2019c
• 2020a will start with Ey = 0.8 mm
2019
2019

October

1

11

BT Study

21

Linac, BT Study

MR
October
11

Swing shft

Linac, BT Study

89
70

Linac study

12

Maintenance

3

11

21

1

21

Machine study

89

Physics run

70

Linac study

12

Maintenance

3

1

21

1

11

E y*=2 mm

January21

1.5 mmDetuned optics

1.2 mm1

1.0 mm11

Back ground study

Vacuum scrubbing

βy* is squeezed to
0.8 mm by the end of
November.

Machine study

0.8 mmLuminosity tuning

Reserved

Beam-Beam performance

Machine study

The run of 2020 will be operated with

2020a

βy* = 0.8 mm

Back ground study

Reserved

January
1
1

21

1

11

February

11

MR

Jan.
~ Mar. 2020
2020a
February

11

January

BT Study

Linac, BT Study

21

1

21

March

11

21

1

11

Linac, BT StudyOwl shiftMROwl shiftDay shiftDay shift

Swing shft

Swing shft
Machine study

26

Physics run

402

Linac study

63

Maintenance

102Luminosity tuning

Beam-Beamperformance
1.5mm
1.2 mm
1.0 mmDetuned optics

BT Study

11

21

0.8 mmBack ground study

2020

1

Back ground study

Vacuum scrubbing

E y*=2 mm

21

2020
December

11

January11

Now here2019cNovemberDay shift1

Physics run

1

2020

December2019

Owl shiftachine study

November

Machine study

26

Physics run

402

Linac study
MaintenanceE y*=0.8 mm
E y =0.8 mm
*

63
10

Detuned optics

Detuned optics

Vacuum scrubbing

Vacuum scrubbing

B2GM

Luminosity tuning

Luminosity tuning

BT Tuning

Oct. 21, 2019

BT Tuning

21

1

[mm]
EyEy[mm][x10 cm
cm s s ] ]
LL
[x10
pp

Int.LL[fb[fb ] ]Int.

vsIb+
Ib+xIxIb-b-[mA[mA] ]
vsExpected Luminosities by Summer 2020
3.0
3.0
3.0

200
200
200

1.0
1.0
1.0

Operation plan: near term

for the Option Plan: βy* = 0.8• Expected luminosities in Option-1 plan
L x E [x10 cm s ]
Beam
Dose
[Ah]
Beam
Current[A]
βyE*[mm]
PxI
Beam
dose
[Ah]
L [x10
cm
s
]
Int.
L
[fb
]
[mm]
xI[Pa
I[Pa
[Pa
A]
Beamdose
dose[Ah]
[Ah]
I [A]
Beam
I[Pa
A]A]
I [A]
vsPP
IPxxxI
[mA
]A]
*
y

p

34

-2 -1

sp

-1

*
y

31

b+

b-

-1 -1

2

Operation
plan:
near
term
Operation plan: near term
3.0

200
2000
2000
2000

1.0

pectedluminosities
inOption-1
plan
Expectedluminosities
inOption-1
plan
Assumptions:
Assumptions:
Assumptions:

Beam dose [Ah]by 50%.
P x I [Pa A]
I [A]-2 with
Similarbackgroundlevellevel
as2019b,
2019b,
slightlyimprovement
improvement
Similarbackground
level
as
by
34
-1 slightly
Similarbackgroundasslightly
improvement
by50%.
50%. -1-1
34-2 with34-1]slightly-1]
p effects
Similarbeam-beameffectsas
2019b,
slightlyimprovement
improvement
by20%.
20%.
Similarbeam-beamas
2019b,
byLeffects
cm-2with
swith
Int.
L
[fb
mm]Similar
beam-beamas
2019b,
withslightly
improvementby20%.
p [x10**

LL[x10[x10 cmcm ss ]]

Int. LL [fb[fb ] ]
Int.

Beam
backgroundis
independentof
Beambackgroundisisindependent
independent
BeambackgroundofofEEEyy*y.. .

3.03.02000
BPAC2019/10/27
2019/10/27KEK
KEK
BPAC
BPAC
2019/10/27
KEK

Lsp x Ey** [x103131
cm-1-1-1s-1-1-1]
31
Lsp[x10 cmcm
LspxxβEyy* [x10s s] ]
2vs Ib+xIb-[mA22]
vs IIb+[mA ] ]
vsb-b-[mA
b+IxI

4646
46

200
200

1.0 1.0

Assumptions:
Similar background level as 2019b, with slightly improvement by 50%.
Similar beam-beam effects as 2019b, with slightly improvement by 20%.
Beam background is independent of Ey*.
BPAC 2019/10/27 KEK

46

Beamdose
dose[Ah]
[Ah]
Beam
P
P xx II [Pa
[PaA]
A]
I [A]
I [A]
Assumptions:
1) Specific luminosity will be proportional to 1/βy*.
2) Similar background level as 2019b, with slightly improvement by 50%.
3) Similar beam-beam effects as 2019b, with slightly improvement by 20%.
4) Beam background is independent of βy*.
2000
2000
4) Expecting vacuum scrubbing of LER during operation: decrease in dP/dI proportional to 1/BD. 5) Efficiency of integrated luminosity is 70%.
B2GM

Oct. 21, 2019

Summary• Phase-3, 2019 Spring Commissioning (Mar.~Jun)

Peak luminosity of 1.23x1034 was obtained with βy* =2 mm.
Recorded integrated luminosity of 6.5 fb-1 was accumulated.
Nano-beam scheme for βy* =2 mm was demonstrated.
Continuous injection for both rings became available : 50%-increase of efficiency• Concerned Issues

Beam-Beam blow-up and flip-flop phenomena are observed in beam sizes. Detailed sturdy will beneeded.
Beam background is one of the significant problems. Many countermeasures will required.
HER bellows chamber and BPM connectors in IR were broken in 2019-spring operation. They were
replaced with new ones.

• Improvements for Quick Abort Kicker Firing

In order to avoid QCS quench, abort trigger system was improved, anddelay of Abort request signal to the kicker firing was significantly reduced:• QCS Magnet Failure Abort Request : 60 ms → 50µs
• Abort Gap : 1 → 2• Synchronization with gap timing : 17µs → 5µs• Plans for Next Operation (2019 Oct. ~ 2020 June)
Goal : Integrated Lumi. of ~200 fb-1 by the summer 2020
→ L = 2~3 x1034 cm-2s-1 is required from the beginning of 2020
- Base Plan: βy* 2.0 → 1.0 in 2019 : Expected L ~ 3 x1034 cm-2s-1- Optional Plan: βy* 2.0 → 0.8 in 2019 : Expected L ~ 3 x1034 cm-2s-1
2020-Spring operation will be concentrated to physics run.
B2GM

Oct. 21, 2019

Thank you for your attention !

B2GM

Oct. 21, 2019

Backup Slides

B2GM

Oct. 21, 2019

Operation
plan:
near
term
Operation
plan:
near
term
2020 * Spring
Plan
(Jan.
~
June)
*

• Option-2
Ey 2.0Æ 1.0
during
2019c,
0.8mm
mm• Option-2(Ey (2.0
Æ 1.0
mmmm
during
2019c,
1.01.0ÆÆ0.8
OptionPlan-2: βy* 2.0→ 1.0（2019) → 0.8 (2020)
in 2020a)in 2020a)• 2019c,
2020a,bcommissioningplan• 2019c,
2020a,bcommissioning
plan
Oct. ~ Dec. 20192019
October

October11NovemberNovember
1

21

21

BT Study

y

11

11

2019

2019

1

December

11

11

21

21

December 11

1

1

11

21

1

21

1

Linac, BT Study

Linac, BT StudyMR
Owl shiftift

Day shift

ift

Swing shft

shft

Machine study

89

Machine study

Physicsrun
89

70

Physics run

Linac
70 study

12

Linac study
Maintenance

Maintenance12

E y*=2 mm

1.5 mmE y =2 mm*

3

1.5 mm

1.2 mmDetuned optics

Back ground study

Beam-Beam performance
Back ground study

Machine study

Luminosity tuning

Reserved

Beam-Beam performance

Machine study

Back ground study

Reserved

2020

Jan. ~ Mar. 2020

January
1

21

11 Linac, BT Study
21

1

MR

February

11

January

BT Study

BT Study

1.0 mmLuminosity tuning

Detuned optics

Vacuum scrubbing

1.0 mmBack ground study

Vacuum scrubbing

3

1.2 mm1

February

1

11

11

21

21

March
1

1

March

11

11

21

21

Linac, BT StudyOwl shiftMR

Day shift

Owl shift

Swing shft

Day shift

Machine study

Swing shft

33
E y*=0.8 mm

Physics run 395

Machine studyLinac
33 study

63

MaintenancePhysics run
395

10

Linac study

63

Maintenance

10

Detuned optics

Luminosity tuning
E y*=0.8 mm

E y*=0.8 mm

E y*=0.8 mm

Vacuum scrubbing
BT Tuning

Detuned optics

Luminosity tuning

Vacuum scrubbing

BPAC 2019/10/27 KEK

47

BT Tuning

B2GM
Oct. 21, 2019
BPAC 2019/10/27 KEK

47

Expected Luminosities by Summer 2020
Operation plan: near termfor Option Plan-2: βy* = 2 → 1→0.8• Expected luminosities in Option-2 planβEyy**[mm][mm]3434cm-2ss-1-1
Lp [x10
cm-2]]
L [x103.0[fb-1-1]]
Int.Int.LL[fb31cm-1s-1]
Lsp LxspβxyE*y*[x1031[x10 cm-1s-1]
vsvsIb+
Ib+IbxIb-[mA[mA2]2]200

1.0Beam Current
[A]
I [A]

BeamDose
dose [Ah]
Beam
[Ah]

PxI
A]
P x [PaI [Pa A]

2000

Assumptions:
Assumptions:
1) SpecificSimilar
luminositybackgroundwill be proportional
to 1/β.
level
asy*2019b,with slightly improvement by 50%.
2) Similar Similar
backgroundlevel as 201b, withslightly
by 50%.
beam-beameffects
asimprovement
2019b, withslightly improvement by 20%.
3) Similar beam-beam effects as 201b, with slightly improvement
by 20%.
*.
BeambackgroundisindependentofE4) Expecting vacuum scrubbing of LER during operation: decrease
in dP/dI in proportion to 1/BD. 5) Efficiency of integrated luminosity is 70%.
y
BPAC 2019/10/27 KEK
49
B2GM

Oct. 21, 2019

Long Termplan
Plan (~2029)
Commissioning• Long term plan ~2029
Ey* [mm]

Lp [x1034 cm-2s-1]

Int. L [fb-1]

Lsp x Ey* [x1031 cm-1s-1]
vs Ib+xIb-[mA2]

80
50

PXD
0.3

RF

I [A]

Beam dose [Ah]P x I [Pa A]

Assumptions:
Background
improves
by a offactorof 2 tocompareto2019b.
the level of 2019b.
Background improves
by a factor
2 comparethe level of
Beam-beam improves
by a factor
2 compered
to the level ofto2019b.
BeamofbackgroundBeam-beam
improves
by a offactorof 2 compered
the level
2019b. is independent of βy*.
8 months
shutdown in 2022
for PXD and 6 ofmonthsBeambackgroundis independent
Ey*. in 2024 for RF upgrade.
8 months shutdown in 2022 for PXD and 6 months in 2024 for RF upgrade.
BPAC 2019/10/27
KEK21, 2019
B2GM
Oct.

51

Long Termplan
Plan (~2029)
Commissioning• Long term plan ~2029

PXD

RF

Assumptions:

Assumptions:
Backgroundfactor of to2 thecomparethe level of 2019b.
Background
improvesimproves
by a factorbyof a
2 comparelevel ofto
2019b.
Beam-beamfactor of 2tocompered
the level
2019b. is independent of βy*.
Beam-beam
improvesimproves
by a factorbyof a
2 compered
the level of to
2019b.
BeamofbackgroundBeam
backgroundis independentof Ey*in. 2024 for RF upgrade.
8 months
shutdown
in 2022 for
PXD and 6 months

8 months shutdown in 2022 for PXD and 6 months in 2024 for RF upgrade.
BPAC 2019/10/27 KEK

B2GM

Oct. 21, 201952