Overview of Ring Construction
Status and Schedule �

Kazunori AKAI�March 4, 2013�
18th KEKB Accelerator Review Committee�KEKB to SuperKEKB�Colliding bunches

Belle IINew IRe- 2.6 A
New beam pipes& bellows

New superconducting final
focusing magnets near the IP

e+ 3.6 A

Reinforce RF systems forhigher beam currents
Improve beam monitorsand control system

Redesign the lattice to squeeze theemittance (replace short dipoles withlonger ones, increase wiggler cycles)

New positron
capture section

e+ Damping ring

Replace beam pipes to suppress electron cloud(TiN-coated beam pipe with antechambers)

Low emittance electron gun" ± $ # *y ' I±*± y $ RL '
L=
& )
&1+ )
2ere % # *x ( + *y % Ry (To	  get	
  x40	
  higher	
  luminosity	Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

2�!

SuperKEKB rings master schedule�
Calendar�

2011�

2010�

Japan	
  FY�

2010�

2013�

2012�
2012�

2011�

2014�
2014�

2013�

・・・�

2016�

2015�

2016�

2015�

now	
  here	KEKB	
  operaEon�

SuperKEKB-­‐MR(LER&HER)	
  construcAon�

SuperKEKB	
  commissioning�

opEcs	  design�

phase	  2	  phase	  1	  dismantling	
  KEKB�fabricaEon	
  and	
  tests	
  of	
  MR	
  components�
TiN	
  coaEng	
  &	
  baking	
  of	
  beam	  pipes�
install,	
  assembly	
  and	
  set	  up�phase	  3	  w/	
  full	  Belle	  II�
w/	  QCS	  w/	  Belle	  II	
  (no	
  VXD)�

w/o	
  QCS	  w/o	
  Belle	  II�

DR	
  commissioning	
  during	
  phase	
  1�

ﬁnal	
  assembly,	
  RF	
  condiEoning�MR	
  buildings	
  construcEon�
reinforce	  electricity	
  and	
  cooling	
  facility�cool	
  down	  in	
  beam	  line�fabricate	
  QCS-­‐L�
detector	
  upgrade	  to	
  Belle	  II�

fabricate	
  QCS-­‐R�
roll	
  in	
  �

VXD	
  install	
  �

roll	
  out	  �

Belle	
  roll	  out�

opEcs	  design�

rotaEon�
roll	
  in	
  �

cool	
  down	  w/Belle	  II�reinforce	  RF,	
  vac,	
  etc.	
  for	
  higher	
  beam	  current	  SuperKEKB-­‐DR	
  construcAon�

fabricaEon	
  and	
  tests	
  of	
  DR	
  components�
install,	
  assembly	
  and	
  set	  up�DR	
  tunnel	  construcEon�DR	
  buildings	
  construcEon�
electricity	
  and	
  cooling	
  system�Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

3�3	Commissioning Scenario�
• Commissioning will be performed in three phases.�
– Phase 1: w/o QCS, w/o Belle II�• basic machine tuning�• low emittance beam tuning �• vacuum scrubbing�– Belle II people request enough vacuum scrubbing in this stage (before Belle II roll in).�
– At least one month at beam currents of 0.5˜1A.�

• DR commissioning�– Phase 2: with QCS and Belle II, but no VXD�••••low beta* beam tuning�
small x-y coupling tuning�collision tuning�
study beam background�– Belle II people want to carefully check beam background before VXD installation.�

– Phase 3: with QCS and full Belle II�• physics run�• luminosity increase�• This scenario was agreed between KEKB and Belle II.�	  We	  keep	  another	
  scenario	  (scenario	
  B	
  in	
  the	
  next	  slide)	
  as	
  a	
  back	  up	
  in	
  case	  of	
  delay	
  of	
  Belle	  II	
  construcEon.	
  	
Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

4�Commissioning schedule�
Scenario	
  A	
  (base	
  line)	
First	
  target	
  luminosity	
  
1	
  x	
  1034	
  cm-­‐2s-­‐1	

First	
  target	
  luminosity	
  
1	
  x	
  1034	
  cm-­‐2s-­‐1	
Scenario	  B	
  (back	  up)	

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

5�Fabrication status of beam pipes, etc.�
Fabrica'on	
  year	Ring,	
  loca'on	

Material	

Number	

Length	  (m)	

JFY2010	

LER	
  wiggler	
  beam	  pipes	

Cu	

77	

223	

JFY2011	

HER	
  wiggler	
  beam	  pipes	

Cu	

22	

64	

JFY2011	

Chicane,	
  wiggler	
  downstream	
  beam	  pipes	

Cu	

70	

177	

JFY2011	

HER	
  symmetry	
  point	
  beam	  pipes	

Cu	

24	

35	

JFY2011	

LER	
  RF	
  straight	
  secEon	
  beam	  pipes	

Cu	

4	

12	

JFY2011	

LER	
  arc	
  secEon	
  bellows	

Al	

690	

JFY2010-­‐11	

Wiggler	  secEon	
  and	  HER	
  arc	
  secEon	
  bellows	

Cu	

259	

JFY2011	

LER	
  arc	
  secEon	
  gate	  valves	

JFY2011	

LER	
  arc	
  secEon	
  beam	  pipes	

JFY2012	
  ongoing（+2013）	

LER	
  Tsukuba	
  straight	
  secEon	
  bellows	

135	

JFY2012	
  ongoing（+2013）	

HER	
  Tsukuba	
  straight	
  secEon	
  bellows	

135	

JFY2012	
  ongoing	

LER	
  Tsukuba	
  straight	
  secEon	
  gate	  valves	

7	

JFY2012	
  ongoing	

HER	
  Tsukuba	
  straight	
  secEon	
  gate	  valves	

6	

JFY2012	
  ongoing	DR	
  arc	
  secEon	
  beam	  pipes	Al	

JFY2012	
  ongoing	

LER	
  arc	
  skew	
  sextupole	
  beam	  pipes	

Al	

~	
  32	

JFY2013	
  scheduled	

LER	
  Tsukuba	
  straight	
  secEon	
  beam	  pipes	Cu	
  and	  Al	~	
  330	

JFY2013	
  scheduled	

HER	
  Tsukuba	
  straight	
  secEon	
  beam	  pipes	Cu	~	
  330	

JFY2013	
  scheduled	
  (+2014)	

LER	
  Fuji	  straight	
  secEon	
  beam	  pipes	

Al	
  or	
  Cu	

~	
  30	

JFY2013	
  scheduled	
  (+2014)	

HER	
  Fuji	  straight	
  secEon	
  beam	  pipes	

Al	
  or	
  Cu	

~	
  30	

JFY2013	
  scheduled	
  (+2014)	

IR	
  secEon	
  beam	  pipes,	
  collimators,	
  SRM	
  chambers	

JFY2013	
  scheduled	
  (+2014)	

DR	
  straight	
  secEon	
  and	  transport	
  line	  beam	  pipes	Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

24	
Al	

687	

1861	

Al	
6�

Beam pipes treatments�
• Baking and TiN coating system have been constructed
at Oho experimental hall in KEK. Treatment of beam
pipes is well ongoing.�
– About 1000 beam pipes will be baked and TiN-coated in two years.�
Vacuum	  group	
  working	  deck	  in	
  Oho	
  exp.	
  building	  Four	
  baking	
  systems	
  operaEng	
  on	
  the	
  upper	
  ﬂoor	  (B2).	
  Checking	
  and	  preparaEon	
  work	  on	
  the	
  middle	
  ﬂoor	  (B3).	
  	
  Five	  verEcal	
  TiN	
  coaEng	
  systems	
  from	
  B4	
  to	
  B2	
  through.	

B2	

B3	
B4	
A	
  part	  of	
  beam	  pipes	
  in	  a	
  stock	
  house	
Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

7�

K.	
  Shibata	(upper):	
  InserEng	
  ante-­‐chambers	
  into	
  a	
  verEcal	
  TiN	
  coaEng	  system.	
  (lower):	
  Top-­‐side	
  view	
  of	
  ante-­‐chambers	
  in	
  two	
  lines	
  set	  in	
  the	
  coaEng	
  system.	
  	
  	
  	
Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�(upper	  and	
  lower):	
  Copper	
  and	
  Aluminum	
  beam	  pipes	
  ager	  baking	
  and	
  TiN	
  coaEng.	
  They	  are	
  temporary	
  stocked	
  in	
  Oho	  B4	  unEl	  moved	  to	
  tunnel	  or	
  other	
  stock	
  houses.	
8�Target	Al	
  ante-­‐chamber	
  before	
  coaEng	
  
here	

Ager	
  baking	
  Ager	
  TiN	
  coaEng	
  before	  baking	
  Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

9�100 new LER bend magnets installation completed�

field measurement�

move into tunnel�
carry on an air-pallet�

install done�
carry over existing
HER dipole�Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

10�New LER wiggler
layout in Oho D4
straight section�

Construction of new beam lines in
Tsukuba straight section.�

Installation of 100 new LER
bending magnets done�V-steering magnet�

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

11�

Wiggler sections�Installation of LER wiggler chambers in Nikko and Oho straight sections
will be completed in March.�
Installation of HER wiggler chambers
in Oho straight section is done.�

LER	  Wiggler	LER	
  Wiggler	Nikko�Oho�

HER	
  Wiggler	Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

12�

Final focus SC quads (QCS)�

•
•
•
•
•

Eight final focus QCS with 40 corrector coils are to be used. �
Fabrication of QCS-L started in July 2012, and will be completed in JFY2013. �Fabrication of QCS-R is scheduled in JFY2013 and 2014.�
Corrector coils are being wound at BNL under BNL/KEK collaboration.�
Prototype magnet was made at KEK. Test results show sufficient margin for operation. �

QC1LE	
  prototype	
  magnet	  	
Successfully tested without any quench up
to 2157A, well over the design current(1560A) for nominal operation.�
I4S/Ic@4.7K = 62.8%�
I12GeV/Ic@4.7K = 87.0%�
Sufficient margin for operation�
Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

13�Design improvement of QCS since last ARC�• Radiation shield is implemented in the QCS cryostat to
reduce background to Belle II.�– It turned out that Radiative Bhabha scattering seriously deteriorates photomultiplier of Belle II TOP detector: the life time reduces unacceptably (˜1/20).�
– To solve the problem, more radiation shield is added. In particular, Tungsten alloy isused as a part of vacuum vessel of QCS for shielding. �• Permendur yokes and shields are adopted to reduce leakfields.�– The yokes of QC1E and QC2P have the magnetic field from -0.5 T to 0.5T in thegood canceling condition of Belle solenoid field by the accelerator SC solenoids.
With 1% change in the Belle solenoid field, the magnetic field in the yokes reaches
1T.�
– In order to reduce leak field on the other beam, Permendur yokes and shields thathave higher saturation field were adopted.�

• Corrector coils�

– It was found that dynamic aperture is deteriorated by possible skew-sextupole
component of QC1 field. �– Corrector coils in QCS-R is being reconsidered to have sextupole cancellation. (Nochange can be made for QCS-L, which already started fabrication.) �• Optics design�– IR optics design has been almost finalized so that fabrication of magnets and beam
pipes in Tsukuba straight section can start in early JFY2013. �

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

14�Permendur yoke for QC2LP�

Permendur magnetic shield�
for LER beam�Permendur yoke for QC1LE�Permendur magnetic shield�
for HER beam�
Reconsider collector coils in QCS-R�
Tungsten alloy for radiation shield�

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

15�

N.	
  Ohuchi,	
  et	
  al.	

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

16�SuperKEKB QCS const. and commissioning schedule�

N.	
  Ohuchi	

Cooling	
  test	  on	
  beam	  line	

QCS-­‐L	
  producEon	

Field	
  measurement	
  with	  Belle	  II	
  solenoid	

QCS-­‐R	  producEon	
Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

17�RF system�
Upgrade	
  of	
  RF	
  system	
  to	
  cope	  with	  twice	
  beam	  currents	  and	
  2.5	
  Emes	  beam	  power	
• Change to 1 klystron : 1 ARES cavity scheme from 1:2�– RF stations are being added. �– ARES cavities are rearranged, and the input couplers are replaced withimproved ones. �• Measures for HOM power increase in SC cavities�
– Existing HOM dampers are considered marginal at about 2A in HER.�
– Measures are being investigated for the design current of 2.6A: �• Replacing tapers and gate-valves with larger bore ones to reduce loss factor.�
• Adding dampers to disperse HOM power for each damper.�

• New Low-Level RF control system�– A prototype system has been completed. It was operated with a klystron andan ARES cavity, and good performance was demonstrated.�
– LLRF for eight stations will be replaced with new ones. Fabrication will start in
May this year.�
Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

18�

RF	
  high	  power	  system	

1.2MW	  CW	  kystron	

SuperconducEng	
  caviEes	

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

Six	
  ARES	  caviEes	
  in	
  D5	
  
moved	
  from	  HER	  to	
  LER.	
  HER	
  wiggler	
  magnets	
  were	  installed	
  close	  to	
  the	
  ARES.	

19�

OHO	

D4	
1	

2	

C	

KEKB-­‐RF	
2	

B	

A	

A	

B	

FUJI	

D7	

D5	
2	

1	

C	
 E	

E	

2	

2	

D	

C	

B	

1	

2	

2	

A	

D10	

D8	

A	

B	

C	

D	

E	

2	

NIKKO	
2	

2	

D	
 C	
 B	
 A	

D11	
2	

1	

A	
 B	
 C	
 D	
 E	
 F	

HER	
LER	

SuperKEKB-­‐RF	  	
  (phase	
  1)	

add	
  5	
  klystrons,	
  HP&LL	
  
add	
  3	
  power	  supplies	

OHO	

done	

D4	

2	

2	

2	

H	
 G	
 F	
 E	

C	

2	

1	

A	
 B	
 C	
 D	
 E	
 F	

E	

2	

A	

ongoing	

2	

FUJI	

D7	

D5	
done	

2	

D	

2	

C	

B	

1	

2	

2	

A	

D10	

D8	

A	

B	

C	

D	

E	

2	

NIKKO	

2	

D	
 C	
 B	
 A	

2	

D11	
2	

A	
 B	
 C	
 D	

ongoing	add	
  2	
  ARES	

done	

done	
convert	  to	
  LER	

Klystron,	
  HP&LLRF	
  system	2	

remove	  4	
  ARES	

done	

done	

Type	
  “A”	
  power	  supply	
  (for	  two	
  klystrons)	

Type	
  “B”	
  power	  supply	  (for	
  klystron)	
Overview of Ring Construction Status1	
and Schedule,Mar. 4,2013,
K.one	
  
Akai�

ARES	
  cavity	SC	
  cavity	SC	
  crab	

20�

OHO	

D4	
1	

C	

2	

B	

KEKB-­‐RF	
2	

1	

C	
 E	

E	

2	

A	

A	

B	

FUJI	

D7	

D5	

2	

2	

D	

C	

B	

A	

1	

2	

2	

A	

D10	

D8	
B	

C	

D	

E	

2	

NIKKO	

2	

D	
 C	
 B	
 A	

2	

D11	
2	

1	

A	
 B	
 C	
 D	
 E	
 F	

HER	
LER	

SuperKEKB-­‐RF	  	
  (ulAmate)	

add	
  5	
  klystrons,	
  HP&LL	
  
add	
  3	
  power	  supplies	
  	

add	
  2	
  more	  klystrons,	
  HP&LL,	
  	
  
add	
  1	
  more	  	
  power	  supply	
2	

D4	

2	

2	

D7	

D5	

2	

H	
 G	
 F	
 E	
 D	
 C	
 B	
 A	

2	

2	

A	
 B	
 C	
 D	
 E	
 F	

F	
 E	

2	

2	

add	
  2	
  klystrons,	
  HP&LL	
  
add	
  2	
  power	  supplies	

2	

D	

2	

C	

B	

D8	

2	

A	

A	

B	

C	

D10	
2	

2	

D	
 E	
 F	

2	

2	

D	
 C	
 B	
 A	

2	

D11	
2	

2	

A	
 B	
 C	
 D	
 E	
 F	

add	
  2	
  SC	
  (opEon)	
  

add	
  2	
  ARES	
remove	  4	
  ARES	convert	  to	
  LER	

Klystron,	
  HP&LLRF	
  system	

2	

Type	
  “A”	
  power	  supply	
  (for	  two	
  klystrons)	

Type	
  “B”	
  power	  supply	  (for	
  klystron)	
Overview of Ring Construction Status1	
and Schedule,Mar. 4,2013,
K.one	
  
Akai�

ARES	
  cavity	SC	
  cavity	Crab	
  cavity	
21�Demonstration test in high-power operation at D8-D
station successfully done in November last year.�
Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

22�

Beam instrumentations�• BPM�
– Mass production of new narrow band detectors at 509MHz will go in JFY2013.�
– Turn-by-turn detectors of the minimum required number for T=0 (35 per ring) will
be fabricated in JFY2013. �– Fabrication of button electrodes and cables is ongoing.�
– Installation of the electrodes on vacuum chambers has started.�

• Feedbacks�

Bumon	
  electrode	– Two sets of short strip line kickers which cover two transverse feedback loops with90 degrees phase difference will be installed in each ring. �– iGp digital filters have been already purchased.�
– Longitudinal feedback system will be installed in LER to suppress the instability
caused by ARES cavities. Four DAFNE type kickers will be used. �– IP orbit feedback system is being developed.�

• Beam size monitors�– (Visible light monitor) Development of a diamond extraction mirror is in progress to
reduce the heat deformation of the mirror due to synchrotron radiation power.�
– (X-ray monitor) A coded aperture imaging method for the measurement of thetransverse beam size has been successfully tested at CesrTA at Cornell university.�
– (Large Angle Beamstrahlung Monitor) LABM is being built mostly at Wayne State
University (G. Bonvicini et al.).�

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

23�

Positron Damping Ring�
Injector Linac�

Tunnel	  construcEon	

e+ Damping Ring�
circumference 136m�

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

•Tunnel construction under
way in 2012-13; half year
delay due to budget suspend
caused by the earthquake. �•

Buildings will be constructedin JFY2012-13 after tunnel
completed.�

•Fabrication of accelerator
components ongoing.
Installation starts in 2014.�

•DR commissioning will start in2015. �24�

Accelerator components for DR�
• Magnets �– Fabrication of most of magnets and power supplies have completed.�
– Field measurement is ongoing.�
– Sextupole magnets, H-steering magnets, some of power supplies will befabricated in JFY2013. �• Vacuum system�– Fabrication of ante-chamber beam pipes for arc sections is ongoing this year.�
– Beam pipes for straight section and transport line will be fabricated next year.�

• RF cavity�
– A prototype cavity has been high-power tested successfully.�
– Two cavities will be ready by the commissioning.�

• Monitors�
– Fabrication of BPM, feedbacks, loss monitors, etc. is ongoing.�

• Injection system�• Control and timing system�
Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

25�

Facility and infrastructure�
2010�

Calendar�

2010�

Japan	
  FY�

2011�
2011�

2012�
2012�

2013�

2014�

2013�

2015�

2014�

2016�

2015�

・・・�

2016�

now	
  here	Facility	
  and	
  infrastructure	
  for	  MR	  and	  DR�Design	  of	
  MR	
  buildings�
Design	  of	
  cooling	
  system�MR	
  buildings	
  construcEon�
upgrade	
  cooling	
  facility�

construct	
  a	
  new	
  bank	  at	
  Oho	  transformer�
Design	  of	
  DR	
  tunnel,	
  buildings,	
  cooling	
  system�DR	
  tunnel	  construcEon�DR	
  buildings	
  construcEon�
electricity	
  and	
  cooling	
  system�•Construction of DR tunnel, new buildings, upgrading coolingsystem and electricity, etc., are ongoing by the facilities
department of KEK with close communication with theaccelerator group.�

Overview of Ring construction
Construction status
Status andand schedule
Schedule,(K.
Mar.
Akai)�
4, 2013, K. Akai�

26�
26	

Upgrade MR cooling system�• Cooling system needs to be reinforced due
to:�– the increase of beam power on vacuum
chambers, in particular on wiggler chambers at
Oho and Nikko straight sections.�
– the increase of wiggler magnets and othermagnets in both rings.�

System	Vacuum	  	Magnet	
  	

•

unit	

KEKB	

Flow	
  rate	 l/min	

6400	

12800	

Power	

MW	

4.5	

17.8	

Flow	
  rate	 l/min	

15200	

23270	

Power	

10.6	

16.2	

MW	

SuperKEKB	
comment	
Cooling	
  pipes	  removed	
  from	  tunnel	

ΔT	
  =	
  10→20℃	
ΔT	
  =	
  10℃	

Upgrade �– Construction of four new buildings forcooling system starts this FY.�– Replacing cooling pipes and renewing
valves around the ring are ongoing. �
Replacing	
  cooling	
  pipes	
  in	
  the	
  arc	
  secEon	

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

27�Reinforce electricity facility�• Due to the increase of RF stations and wiggler magnets in
the Oho section, an electricity bank of 15 MW needs to be
added at the Oho transformer.�
• The new bank at Oho will be constructed in JFY2013 and2014. At T=0 only the existing facility is used, and the newbank will be connected in summer 2015. �Data	
  provided	
  by	
  M.	
  Ono.	

Transformer	
 power	KEKB	SuperKEKB	
 comment	

Tsukuba	

MW	

5.1	

9.0	

the	
  exisEng	
  facility	
  can	
  provide	

Oho	

MW	

10.4	

25.3	

a	
  15	
  MW	
  bank	  needs	
  to	
  be	
  added	

Fuji	
  *	

MW	

15.4	

22.9	

the	
  exisEng	
  facility	
  can	
  provide	

Nikko	

MW	

14.3	

16.3	

the	
  exisEng	
  facility	
  can	
  provide	

*	
  AR	
  is	
  not	  included.	

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

28�Overall budget (original)�
• Budget�– Total construction budget is 314 Oku-Yen for Rings, Injector, and Belle-II.�
– Most of the budget comes year-by-year based.�
– Operation budget is expected in FY2014 and later.�

JFY2010	

JFY2011	

JFY2012	

JFY2013	Very	
  Advanced	
  Research	
  SP	
  (100	
  Oku-­‐Yen)	
  	

JFY2014	

JFY2015	

JFY2016	  SuperKEKB	
  commissioning	

Other	
  budgets	
  for	  construc'on	  (214	
  Oku-­‐Yen)	
  	
Opera'on	
  budget	
  (con'nues	
  -­‐	  -­‐	  -­‐	
  )	
  	

We	
  are	
  here	

Unit: Oku-Yen (˜1.1M$)�

JFY2010	

JFY2011	

JFY2012	

JFY2013	

JFY2014	

Total	VARSP�

75.0	

10.5	

14.5	

0	

0	

100.0	

Others�

0	

41.6	

40.2	

61.6	

46.7	

190.0	

Buildings�

0	

4.5	

12.4	

7.2	

0	

24.1	

75.0	

56.6	

67.1	

68.8	

46.7	

314.1	

Supplied	

Supplied	

Supplied	

Total�
Status�Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

29�Budget situation in JFY2013-14�
Construction budget �

unit: Oku-yen (˜1.1M$)�

JFY2014�

JFY2013�
Shisetsu-seibi-hi�
(facilities expense)�

appropriated�

Budget for buildings is not included.�

24.5	

B project expense �
for rings, Linac and Belle-II�

KEK burden, etc. �

37.6	

30.5	

to be appropriated�

7.6	

appropriated as JFY2012 supplementary budget.�

6.6	

1.5	
not	
  appropriated	

probably	
  missing	(KEK budget is being reduced year by year.)�

Operation budget �not	
  ﬁxed	Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

30�Cost up since last ARC�• As the optics and hardware design is improved, higher
performances are required for some of the accelerator
components, which increases fabrication cost.�
––––radiation shield in the QCS cryostats�
Permendur yokes of QC1E and QC2P and shields on the other beam line�
improving corrector coils in the QCS�power supplies for magnets �• Estimation of fabrication cost of some othercomponents also increased. �– Some of the reasons are due to cost up for materials and/or changes in theexchange rate. Some others may be related to the effects of the Earthquake. �

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

31�Plans for MR �
• MR commissioning as planned.�
– We understand that we should start first beam operation of MR (hopefully LER
and HER both, at least one of them) during JFY2014 (by March 2015). This isimportant since JFY2014 is the last year when the official construction budget
is supplied. �– The commissioning scenario that was agreed with Belle II group should be
respected. �– We plan to start MR beam commissioning in January 2015, so every
components and works necessary for this has the highest priority.�

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

32�

Plans for DR�• Original plan�– The DR commissioning start in Feb. 2015, about one month later than the MRcommissioning start. �• Issues with the original plan�– Many components need to be fabricated in JFY2013, but as mentioned, weshould manage reduced budget situation and cost up of MR components. �– Tunnel construction delayed by half year due to the Earthquake. Buildings
construction will delay accordingly. Then schedule of installation, alignment,
cabling and piping, system check and conditioning became much tighter. �• New plan under discussion�– The DR commissioning start in May or June 2015. It is about three months
delay from the original plan, but still during phase 1 commissioning period.�
– DR will be operated for about one month in phase 1, which keeps benefit tooperate the DR prior to phase 2 when QCS and Belle II is installed.�

• Merits with the new plan�– Production of some components can be put off to JFY2014. This relaxes thebudget situation.�
– Schedule of installation and other works also relaxes. �Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

33�Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

34�Summary�• Construction is well ongoing.�
– Budget is tight. Schedule is also very tight. But we keep commissioning start in
JFY2014 (target is Jan. 2015). �• Design is improved. �– In particular, the IR region optics and hardware design. �– Beam loss estimation ongoing (not mentioned in this talk).�

• Commissioning will go in three phases.�
––––Main Ring commissioning will start w/o QCS in Phase 1.�
QCS and Belle II (w/o VXD) will be commissioned in Phase 2.�
Physics run with full Belle II (with VXD) will start in Phase 3.�
This scenario was agreed between the accelerator group and Belle II. �• New plan for DR�
– It manages the budget reduction and cost up of MR components. �– It also relaxes the very tight schedule for the DR construction.�
– This plan is under discussion. �

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

35�

Back up slides�Comparison	
  of	
  two	
  scenarios	
  during	  commissioning	
  phase	  2	
Scenario	
  A	
  (w/	
  solenoid)	

Scenario	  B	
  (w/o	  solenoid)	

OpEcs	
  correcEon(1)	
  Squeezing	
  IP	
  beta	  funcEons	We	
  can	  do	
  full	
  tuning.	

We	
  can	  do	
  something.	
  But	  we	
  will	
  
have	
  to	
  do	
  tuning	
  w/	
  Belle	  II	  solenoid	
  almost	
  from	  scratch.	

OpEcs	
  correcEon(2)	
  Achieving	  a	
  small	
  x-­‐y	  coupling	We	
  can	  do	
  full	
  tuning.	

We	
  can	  do	
  something.	
  But	  we	
  will	
  
have	
  to	
  do	
  tuning	
  w/	
  Belle	  II	  solenoid	
  again	
  anyway.	

Collision	
  tuning	We	
  can	  do	
  full	
  tuning.	

The	
  beam	  collision	
  may	  not	  be	
  possible	
  w/o	  Belle	  II	
  solenoid.	

Belle	  II	  background	
  Study	
  and	
  tuning	

The	
  real	  beam	  background	
  can	
  be	
  
Some	
  studies	
  can	  be	
  possible.	
  	
studied.	
  Also	  some	  test	  detectors	
  
can	
  be	
  installed	
  at	
  the	
  place	  of	
  VXD.	

Risk	
  to	
  Belle	
  II	

Maybe	  we	
  can	
  avoid	
  the	
  risks	
  by	
   Less	
  risk	adiabaEc	
  tuning	  (start	
  from	  small	
  beam	  currents,	
  with	  detuned	
  opEcs).	

Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

37�Comparison	
  of	
  two	
  scenarios	
  (cont’d)	
  during	  commissioning	
  phase	  2	
  (cont.)	
Scenario	
  A	
  (w/	
  solenoid)	
Works	
  for	
  accelerator	
   Less	
  works.	
setup	
Cosmic-­‐ray	
  run	
  w/	
  
VXD	

Scenario	  B	
  (w/o	  solenoid)	
One	
  more	  QCS	
  ﬁeld	  measurement.	
  (heavier	
  load	  to	
  QCS	
  group)	

Less	
  Eme	  before	
  phase	
  3.	
  Can	  More	
  Eme	  before	
  phase	
  3.	
also	
  be	
  done	  in	
  the	  beginning	
  of	
  phase	  3.	

Expected	  Eme	
  for	  the	
   Earlier	
  (maybe	
  during	
  phase	  2).	 Later	  (3~5	
  months	
  ager	  phase	
  3	
  
ﬁrst	
  target	
  luminosity	
  	
  start).	
(1	
  x	
  1034	
  cm-­‐2s-­‐1)	
  	Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

38�Recovery from the earthquake̲1�RF	
  control	
  system	Air-­‐ﬁn	
  cooler	
  for	
  klystrons	

Bellows	
  chambers	
20cm	
  fell	  down	

Recovery	
  ongoing	
Recovery	  almost	
  done	X-­‐ray	
  check	
Control	
  systems	
  and	  cables	
  were	  removed,	
  ﬂoors	
  renewed.	
  	
  
New	
  control	
  system	
  will	  be	
  built.	
  Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

39�Recovery from the earthquake̲2�M.	
  Masuzawa	
Rough	
  measurements	
  and	  adjustments	
  ager	  the	
  big	
  earthquake	
  are	  in	
  progress.	
  Measurement	
  in	
  horizontal	
  direcEon	
  using	
  a	
  laser-­‐tracker.	
  This	
  year	  rough	  adjustments	
  will	  be	
  performed	
  to	
  smooth	
  out	
  local	  big	  movement.	
  Precise	  alignment	
  will	  be	
  performed	
  in	
  2013	
  and	  2014	
  at	
  bemer	
  condiEons.	
  	
  Overview of Ring Construction Status and Schedule, Mar. 4, 2013, K. Akai�

40�