SuperKEKB schedule
Kazunori AKAI
Accelerator Laboratory, KEK
Mar. 14, 2018 @KEKB review

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

1Redesign the lattice to squeezeemittance (replace short dipoles
with longer ones, increase
wiggler cycles)

Upgrade Belle II detector
New superconducting final
focusing magnets near the IP

IPe+ 3.6A

SuperKEKB

e- 2.6A

uNano-Beam scheme
extremely small by*
low emittanceuBeam current double
Upgrading (LER) and new (HER)
wiggler sections

γ ± $ σ *y ' I±ξ± y $ RL 'L=& )&1+ )2ere % σ *x ( β *y % Ry (40 times higher luminosity
2.1x1034 --> 8x1035 cm-2s-1€

Replace beam pipes withTiN-coated beam pipes
with antechambers
K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

l Low emittanceRF electron gunl Upgrade positron
capture section

New e+ Damping Ring

Reinforce RF systems forhigher beam currents2

Overall schedule・・・

Calendar year

2010

2011

2012

2013

2014

2015

2016

2017

2018

2019

Japan FY

JFY2010

JFY2011

JFY2012

JFY2013

JFY2014

JFY2015

JFY2016

JFY2017

JFY2018

JFY2019KEKB operation

SuperKEKB LER & HER construction

・・・

HER & LER beam tuning

Startup work Phase 1 commissioning
w/o QCS
w/o Belle II

Collision tuning

Renovation for Phase 2Phase 2 commissioning
w/ QCS
w/ Belle II (no VXD)

Damping Ring construction

Belle II VXD
installation

DR commissioning

FullBelle II

w/ full Belle IIPhase 3

Injector Linac upgrade

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

Now（Mar. 14, 2018）3

28 Jan. 2016
@B2EB

SuperKEKB operation schedule
Calendar year2016

Japan FYNow

2017

2018

JFY2016

JFY2017

JFY2018

JFY2019

Summer shutdown(power saving)

Summer shutdown(power saving)

Summer shutdown(power saving)

Summer shutdown(power saving)

Previous schedule with desired JFY2016 budget
phase 1w/o QCS
w/o Belle IIphase 2

MR renovation for phase 2, including
installation of QCS and Belle II

MR startup

DR installation & startup

MR startup

w/ QCS
w/ Belle II (no VXD)

・・・

w/ full Belle IIphase 3

VXD installation

DR commissioning

New schedule based on JFY2016 budget
phase 12019

w/o QCS
w/o Belle II

w/ QCS
w/ Belle II (no VXD)

phase 2

w/ full Belle IIphase 3

MR renovation for phase 2, including
HER start
installation of QCS and Belle II
LER start VXD installation

DR installation & startup

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

DR commissioning4

History of Phase 2 start change• As of Jan. 2016

– Based on JFY2016 budget allocation, Phase 2 start was shifted from
June to October 2017. (previous page)• As of summer - winter 2016

– Due to production delay in Belle II, some of installation work were moved
to after Belle II roll-in, originally scheduled before the roll-in. This required
four more months after the roll-in.
– QCSR delivery delayed due to several problems during fabrication process
at company.
– These issues shifted Phase 2 start from Oct. 2017 to mid-Feb. 2018.
– The JFY2017 budget allocation, announced in Dec. 2016, turned out tobe compatible with the new plan. (next page, upper)• As of Sep. 2017

– An interference problem on piping and cabling occurred in very tightspace during Belle-II installation work. It took a half month to repair it,
which shifted Phase 2 start from mid-Feb. to early Mar. 2018.

• As of Feb. 2018

– An water leak problem occured in a beam pipe cooling channel close tothe IP. We decided to take temporary measure which needs two weeks
work, instead of to access and repair, which would require 7 weeks.
– The ongoing schedule is to start BT tuning on 16 March and HER tuning
on 19 March. (next page, lower)

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

5IR-related schedule change in 2017
Schedule plan as of Feb. 2017 (shown at BPAC)
45

6Beam

Phase 1QCSL

Test @exp. hall

QCSRFabrication201820172016
789101112123

Dismantle IRBelle II

Solenoid excit. test TOP repair work

6BeamPhase 1QCSL

Test @exp. hall

QCSR

Fabrication

789101112Until September wasprogressing on schedule.

789101112

1

Dismantle IR

Belle II

Solenoid excit. test TOP repair work2

3

Phase 223456

7891011121

23

Phase 2to IP Cool down, Field measurement beam pipe to IP Cool down
back
to IP Cool down, Field measurement beam pipe to IP Cool down
Delivery to KEK 2/13
backInstall piping, cabling
Restore IR (accelerator)
Remove IR bridge
CDC install, piping, etc. Roll-in 4/11
Solenoid excitation FW E-cap, Beast II, etc
Solenoid

Install, piping, cabling Cool down test

IR-accel.

12018 mid Mar.

2017

2016
5

6

back

Ongoing schedule (14 Mar. 2018)
4

5

to IP Cool down, Field measurement
Cool down
to IP
back
to IP Cool down, Field measurement
Delivery to KEK 2/13
Cool down
to IP
backbeam pipe Restore IR (accelerator)
Install piping, cabling
Remove IR bridge
CDC install, piping, etc. Roll-in 4/11
Solenoid excitation
FW E-cap, Beast II, etc
Solenoid

Install, piping, cabling Cool down test

IR-accel.

4

mid-Feb.

backA half month delay occured due toan interference problem at Belle II
Two weeks more delay due towater leak trouble at IR
K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

6

QCS installed in IR
Belle II detector before
Roll-in.

QCSL was installed in July
2016, and cool down test
was done in Dec. 2016.

QCSR was installed
after delivery to KEK
on Feb. 13, 2017.

Photo taken in March 2017.
K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

7

QCS field measurementMay – Aug. 2017--> Talk by N. Ohuchi• Cool down test and field measurement of QCS was successfullycompleted by the end of August, as scheduled.
• No serious issue for Phase 2 was found from measured data.
SSWJuneHarmonic coilno operation

Hall probe

AugustJulySep.

QCS warm up forElectric power cut off (Aug. 4-6) andHigh pressure gas reguration (Aug. 9)

QCS group took 3 shifts for 24 hours/day
during harmonic coil measurement

N. Ohuchi
K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

QCS field measurement completed
at the end of August, as scheduled.

8

IR work in autumn 2017
Sep. – Dec. 2017

• During this period Belle II group works for installationof detectors, cabling, piping, etc. was conducted.
• In parallel with Belle II group works, accelerator group
work was conducted.
– Cooling efficiency of current leads at QCS service boxes wasimproved.
– Beam pipes in QCS were changed from those used formagnetic field measurement to those for Phase 2 operation.
– Short beam pipes with BPMs and bellows were attached to theIP chamber.
--> Talk by K. Kanazawa• Belle II works completed at the end of December.
– Subsequently, accelerator group work resumed in January,including QCS move-in, restoring IR components, etc.

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

9QCS - Belle II connection
K. Kanazawa, @B2GM, Feb. 5, 2018

QCSR connected
to Beast II

QCSR head

Photo by I. Nakamura
QCSL head

Leak checking scene
K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

10Final work befor Phase 2
L-side（Nikko-side, D1-side, BWD）

R-side (Oho-side, D2-side, FWD)

All magnets are re-installed and all beam pipes are connected. Cabling and other works finished.

K. Kanazawa, @B2GM, Feb. 5, 2018

Final work: Set new
concrete shields to IP.
This will be completedby Mar. 14.

MR phase 2 beamcommissioning will start soon:ll

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

BT tuning on 16 MarchHER tuning on 19 March

11

Improvements in MR other than IR•––•

New septum for injection region

New septum and beam pipes to accommodate the newpositron injection scheme with DR were installed.
LER abort system including kicker magnets was upgraded
to tolerate higher beam current with a smaller beam size.

Collimators added around Tsukuba straight section––•Y. Suetsugu, et al.

Injection part change

Based on good performance confirmed during Phase 1,
mass production was conducted for Phase 2.
Six new collimators (two V-type ones and four H-type ones)
have been added to meet requirements for Phase 2operation.

More mitigation for e-cloud–

Apply permanent magnets to beam pipes at drift spaces,
etc. for higher beam current in Phase 2 completed.

Permanent magnets at drift space

Vertical type collimator (D02_V1)

e-New
HER D01
H5, H4, V1

NewLER D02
H4,H3,V1

e+Collimator system in Phase-IIPhase II

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

12Beam InstrumentationnInstall QC1 orbit detectors for IP orbit feedback.

M. Tobiyama- Resolution <1µm with feedback bandwidth < 100Hz- Integrate CCC, Dithering FB and Beam-beam kick based FB

nAdd 20+ Gated turn-by-turn monitors- 117 (existing) + 22 (new)- Inside QCS cryostat, Near injection point, Near beam collimatorsn

XRM beam size monitors- Deep Si pixel detector and spectrometer (SLAC) and 128-ch fast
readout systems (Hawaii)
J. Flanagan- Increase by of HER source point for better resolution.

nLABM (Wayne State Univ.)- Start measure real beamstrahlung

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

13Other work in MR for Phase 2• Appropriate maintenance and improvements of anumber of accelerator components for higher
reliability and higher performance, in particular:– power supplies for magnets,– magnet alignment,– high power RF components and RF cavities– cooling systems,– control systems, etc.

• Development of tools needed for phase 2commissioning.
– operation software,– timing control system, etc.

• Modification of safety system– to manage new DR and PF-AR direct injection systems.
K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

14Damping Ring Complex

N. Iida, @B2GM, Feb. 5, 2018
The DR damps the emittance of the e+ beam to inject into the LER.
The positron beam from Flux Concentrator(FC) has a huge longitudinal distribution.
LTR: The energy spread(5%) should be reduced within the energy acceptance of the DR(1.5%) with theEnergy Compression System(ECS) in the LTR.
RTL: The bunch length extracted from the DR(6.7mm) should be shortened(0.65mm) to fit the LINAC S-bandsystem with the Bunch Compression System(BCS) in the RTL.

Injection

Extraction

ex(nm)

1300

41.5ey(nm)1200

2.1sz(mm)±30*

6.6sd(%)

±1.5*

0.055

sz=±6.6mm±1.5%

DR* Full width

Positron Target+FC
sz=±0.65mm

Sector 1

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

Sector 2

ECS±5%BCS

Sector 3
15

DR construction completed

H. Sugimoto, Promotion Committee of B Factory, Jan. 31, 2018

Septa and Kickers
Ante-chamber

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

16More photos for the DR
DR arc section

ECS

RTL (transport linefrom DR to Linac)

DR arc section

LTR (transport linefrom Linac to DR)

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

RF cavities

Ext. septum17

DR commissioning• LTR beam tuning started on Jan. 23, 2018.
– Major study items for LTR completed by Feb. 7.

• DR beam tuning started on Feb. 8.
• Rough plan of DR beam tuning:– DR Injection+DR rough tuning: 2-3 days
– DR Extraction+RTL+LINAC Tuning(Rough): 2-3 days
– DR + RTL Fine Tuning: 2 weeks– The vacuum scrubbing needs:• About 5 days x 3 shifts for 0.5nC/bunch, 4bunch.

• Injection to LER via DR– Beam injection to LER via DR is needed in late March.
– The DR commissioning plan and ongoing status meet therequirement.
--> Talks by N. Iida (LTR/RTL) and H. Sugimoto (DR)--> Talks by K. Furukawa and Linac members (Linac)
K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

18

MR Phase 2 commissioning• Major purposes of Phase 2--> Talk by Y. Ohnishi– To verify Nano-Beam collision scheme by achieving expectedluminosity.
– To study beam background and judge if Vertex Detector(VXD) can be installed in Belle II for Phase 3.

• Term of Phase 2– Will start soon:• BT tuning starts on March 16.
• HER tuning starts on March 19.
• LER tuning follows.

– Will continue until July 17.
• Limited by high pressure gas regulation and power cut scheduledin August.

– To complete phase 2 by summer is very important: otherwise
Phase 3 start will be significantly delayed.
K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

19Phase 2 to 3 transition• Transition work to Phase 3 will start after Phase 2completed on July 17, 2018.
• Working contents:– Dismantle IR accelerator components. (Accelerator Gr.)
– Belle II group work for VXD installation, etc. (Belle II Gr.)– Restore IR accelerator components. (Accelerator Gr.)• Term of work
– Depends on working contents for Belle II.
• (Term for accelerator-related work can be estimated from our experienceto prepare for Phase 1 and 2.)– In the last B2GM held on Feb. 5 it was agreed btw accelerator
and Belle II to aim at starting Phase 3 in February 2019.

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

20Current status and plan for 2018
Calendar year

2016

2017
JFY2016

Japan FY2018
JFY2017

JFY2018

JFY2019

Summer shutdown(power saving)

Summer shutdown(power saving)

Summer shutdown(power saving)

Original planw/obasedon JFY2017 budget
QCSw/ QCS
w/ Belle II (no VXD)

Phase 2Phase 1 w/o Belle II

MR startup・・・2019

MR renovation for phase 2, including
installation of QCS and Belle II

DR installation & startup

HER start
LER start

w/ full Belle IIPhase 3

VXD installation

DR commissioning

Phase 3 will start within
JFY2018 (target is Feb.)

Ongoing status and JFY2018 plan
Phase 1MR startup

w/o QCS
w/o Belle II

w/ QCS
w/ Belle II (no VXD)

Mostly progressing asplanned for Phase 2.

MR renovation for phase 2, including
installation of QCS and Belle II

DR installation & startup

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

Phase 3Phase 2
HER start
LER start

w/ full Belle II

VXD installation

DR commissioning
NowMar. 14, 201821Summary• Renovation work for SuperKEKB Phase 2 will complete
this week. (by 15 March, 2018)– MR phase 2 commissioning will start in mid-March.

• DR construction completed and test operation started.
– Beam tuning of LTR and DR started in Jan. 23 and Feb. 8,
respectively.
– It is expected that injection to LER via DR will be ready when it isneeded (late March).

• JFY2018 schedule is being solidified.
– Phase 2 operation will continue until July 17, 2018.
– After Phase 2 to 3 transition work completed, Phase 3 operation
will start (target is Feb. 2019).

K. AKAI, SuperKEKB schedule, Mar. 14, 2018 @KEKB review

22