Main	  Ring	  Magnet	  system	  Mika	  Masuzawa	
Power	  supply	  design	  	  	  Tes8ng	  Magnets:	  	Magnet	  design	  &	  	  Tuning	  	  Installa8on	  	  Field	  measurements	  	  	  Installa8on	  Cabling	  Survey	  &	  alignment	  	  	  Check
T.	  Oki’s	  talk	 	  2016/6/13	

KEKB	  Review	  2016	

Contents	
1. Introduc8on	  of	  the	  MR	  magnet	  upgrade	  2. Things	  needed	  to	  be	  done	  for	  the	  MR	  start-­‐up	  	  lMagnet	  installa8on	  lSurvey	  &	  Alignment	  lMagne8c	  ﬁeld	  measurements	  3. For	  Phase	  II	  4. Summary	  2016/6/13	

KEKB	  Review	  2016	

1. Introduc8on	  of	  the	  MR	  magnet	  upgrade	  2016/6/13	

KEKB	  Review	  2016	

2016/6/13	

KEKB	  Review	  2016	

Parameters	  of	  the	  newly	  fabricated	  MR	  main	  water-­‐cooled	  magnets	

Arc	  dipoles,	  wigglers	
Mainly	  Tsukuba	  straight	  sec8on	  magnets	  2016/6/13	

KEKB	  Review	  2016	+	  ~250	  steering	  magnets	

2. Things	  needed	  to	  be	  done	  for	  the	  MR	  start-­‐up	  	  2016/6/13	

KEKB	  Review	  2016	

Things	  needed	  to	  be	  done	  for	  the	  MR	  start-­‐up	
Magnet	  installa8on	  •In	  the	  north	  tunnel.	  
Survey	  and	  alignment	  •2nd	  round	  survey	  of	  the	  en8re	  tunnel	  followed	  by	  ﬁnal	  alignment	  of	  the	  magnets.	  
Magne8c	  ﬁeld	  measurements	  (to	  evaluate	  the	  magne8c	  coupling	  between	  adjacent	  magnets)	  Cooling	  water	  •Water	  ﬂow	  check	  and	  balancing	  among	  2000	  magnets	  Power	  supply	  system	  (T.	  Oki’s	  presenta8on)	  •Full-­‐scale	  start-­‐up	  and	  tuning	  of	  the	  power	  supplies.	  
•Cabling	  checks,	  including	  polarity.	  

Comple8on	  of	  the	  database	  è Integra8on	  of	  all	  this	  in	  8me	  was	  needed.	  Magnet	  installa8on		  NORTH	  TUNNEL	  	  DITHER	  COILS	  	  (PHASE	  II)	2016/6/13	

KEKB	  Review	  2016	

Magnet	  installa8on	  in	  the	  north	  tunnel	  We	  needed	  to	  wait	  un8l	  the	  vacuum	  chambers	  were	  ready	  to	  be	  installed.	
IP	
2016/6/13	

KEKB	  Review	  2016	

North	  tunnel	  Magnet	  installa8on	  completed	  In	  May	  2015.	  

Replacement	  of	  a	  vacuum	  pipe	  in	  a	  quadrupole	  magnet	  would	  be	  a	  nightmare.	  
Because	  	  the	  air	  pallet	  can	  not	  go	  beyond	  this	  point	  and	  	  We	  need	  to	  build	  a	  support	  frame	  from	  which	  to	  suspend	  the	  chain-­‐block	  to	  open	  the	  quads.	  
2016/6/13	

KEKB	  Review	  2016	

Installa8on	  of	  the	  dither	  coils	  The	  dithering	  coils	  were	  designed,	  fabricated,	  and	  ﬁeld	  measured	  by	  SLAC,	  and	  shipped	  to	  KEK	  in	  April,	  2015	  2016/6/13	

KEKB	  Review	  2016	

Installa8on	
Installa8on	  and	  checks	  completed	  in	  June,	  2015.	  Many	  many	  thanks	  to	  Uli	  and	  the	  SLAC	  team.	

Survey	  and	  alignment		  Survey	  Results,	  	  	  Strategy	  for	  the	  ﬁnal	  alignment	  	  Tunnel	  mo8on	  monitoring	
2016/6/13	

KEKB	  Review	  2016	

2nd	  round	  survey	  campaign	  June	  and	  July	  2015	  	Survey	  was	  carried	  out	  by	  3	  teams.	  
Calibra8on	  of	  the	  laser	  trackers	  was	  done	  carefully.	  	  	  Special	  aden8on	  was	  paid	  to	  systema8c	  errors,	  as	  even	  very	  small	  systema8c	  errors	  can	  result	  in	  a	  large	  error	  at	  the	  end	  over	  hundreds	  of	  measurement	  sets.	  	  (long)	  distance	  being	  compared	  	  with	  TS30	
2016/6/13	

KEKB	  Review	  2016	

2nd	  round	  survey	  campaign	  June	  and	  July	  2015	  	Constraints	  on	  the	  working	  area/8me	  Alignment	  can	  not	  coexist	  with	  PS	  test,	  PS	  test	  can	  not	  coexist	  with	  water	  ﬂow	  check,	  none	  can	  coexist	  with	  RF	  high	  power	  test	  (if	  in	  the	  same	  area)…,civil	  engineering	  can	  not	  coexist	  with	  survey/alignment…	  	  More	  than	  1200	  network	  control	  points	  in	  the	  tunnel	  More	  than	  4000	  reference	  points	  for	  the	  magnets	  More	  than	  5000	  points	  to	  be	  surveyed	  and	  analyzed.	  
More	  than	  400	  LT	  seengs,	  with	  overlaps	  KEKB	  Review	  2016	

Survey	  Results	IN	  THE	  HORIZONTAL	  	  PLANE	  (X,Y)	  	We	  got	  hundreds	  of	  data	  points	  every	  day	  from	  3	  teams,	  	  which	  were	  analyzed	  and	  cross-­‐checked	  by	  T.	  Adachi,	  T.	  Kawamoto	  &	  M.Masuzawa	  independently	  everyday.	  	  If	  we	  found	  something	  funny,	  	  we	  requested	  the	  survey	  team	  to	  go	  back	  before	  they	  moved	  a	  long	  distance	  down	  the	  tunnel.	  	  2016/6/13	

KEKB	  Review	  2016	

Survey	  Data	  and	  analysis	  results	
IP	2016/6/13	

The	  north	  and	  west	  parts	  expands	  to	  the	  outside	  as	  large	  as	  10	  mm.	  	  	  This	  probably	  happened	  when	  the	  TRISTAN	  monuments	  were	  ﬁrst	  built.	  
	  Does	  this	  mader?	  
èNo.	  	  Deforma8on	  of	  low	  order	  does	  not	  mader.	  	  Constraints:	  The	  rings	  have	  to	  close.	  
èSmooth	  periodic	  curves	  will	  do.	  	  Our	  choice	  was	  Fourier	  series	  (n=60).	  We	  tried	  FS	  with	  n=30	  but	  the	  #	  of	  magnets	  to	  be	  adjusted	  increased,	  the	  amount	  of	  the	  adjustment	  became	  larger…	  (of	  course	  we	  can	  do	  it	  but	  it	  would	  have	  aﬀected	  other	  accelerator	  components	  such	  as	  vacuum	  chamber	  and	  rf…)	  KEKB	  Review	  2016	

Survey	  Data	  and	  analysis	  results	  	  Devia8on	  from	  smooth	  curves	  (we	  call	  it	  the	  “Adachi	  Curve”)	
We	  used	  the	  old	  laece	  (oops)	  S:	  	  Beam	  direc8on	  T:	  	  perpendicular	  to	  the	  beam	

The	  spread	  in	  “s	  (beam	  direc8on)”	  is	  larger.	  
This	  is	  due	  to	  the	  expansion	  joints.	  
The	  temperature	  was	  NOT	  controlled	  during	  the	  SuperKEKB	  construc8on.	  
The	  temp.	  diﬀer	  between	  	  when	  we	  did	  the	  1st	  rough	  alignment	  and	  the	  2nd	  survey.	
2016/6/13	

KEKB	  Review	  2016	

Survey	  Data	  and	  analysis	  results	  	  Devia8on	  from	  smooth	  curves	  (we	  call	  it	  the	  “Adachi	  Curve”)	
S:	  	  Beam	  direc8on	  T:	  	  perpendicular	  to	  the	  beam	

Expansion	  joints	  to	  absorb	  the	  thermal	  expansion	  &	  contrac8on.	

The	  spread	  in	  “s	  (beam	  direc8on)”	  is	  larger.	  
This	  is	  due	  to	  the	  expansion	  joints.	  
The	  temperature	  was	  NOT	  controlled	  during	  the	  SuperKEKB	  construc8on.	  
st	  rough	  alignment	  and	  the	  2nd	  survey.	
The	  2016/6/13	
temp.	  diﬀers	  between	  	  when	  we	  did	  KEKB	  the	  R1eview	  2016	

Alignment	  strategy	
Discussion	  with	  the	  op8cs	  group	Alignment	  strategy	Alignment	  was	  carried	  out	  by	  two	  teams,	  followed	  by	  a	  survey	  team	  dedicated	  to	  checking	  the	  alignment.	  	
Before	Found	  a	  misalignment,	  	  which	  was	  ﬁxed	  right	  away.	

安心して下さい	

B2E_26	

Survey	  Results	
VERTICAL	  (LEVEL)	

2016/6/13	

KEKB	  Review	  2016	Tunnel	  sinking	  con8nues	

34mm /16years= 2.1mm / year

€Survey	  Data	  and	  analysis	  results	

We	  ﬁxed	  the	  gap	  in	  the	  magnet	  level	  from	  the	  2011	  Earthquake	
The	  data	  were	  used	  to	  “pre”-­‐set	  the	  V-­‐
steering	  magnets	  when	  circula8ng	  the	  beam.	

Survey	  Results	
CIRCUMFERENCE	  PREDICTION	  FOR	  A	  SMOOTH	  START	  UP	  OF	  THE	  BEAM	  CIRCULATION	

2016/6/13	

KEKB	  Review	  2016	

Circumference estimate

Our best guess from the survey and analysis was that thecircumference is about 16.4 mm longer than the SuperKEKB
design. This information was used when injecting the LER beam
to the ring on Feb.9, 2016 and the beam said Yes!

Our	  rings	  look	  like	  this	  (Our	  rings	  have	  been	  always	  larger	  than	  the	  design)	

Our	  rings	  were	  the	  largest	  	  right	  aser	  the	  Great	  East	  Japan	  Earthquake	  in	  2011. They	  started	  shrinking	  but	  not	  back	  to	  the	  level	  of	  KEKB.	

2016/6/13	

KEKB	  Review	  2016	Tunnel	  Mo8on	  Monitoring	
HLS	  (HYDROSTATIC	  LEVELING	  SENSORS)	
2016/6/13	

KEKB	  Review	  2016	Tunnel	  mo8on	  monitoring	The	  HLS	  system	  was	  used	  to	  monitor	  the	  tunnel	  mo8on	  during	  the	  PF-­‐AR	  BT	  tunnel	  construc8on	  (presented	  at	  2015	  review).	  
It	  was	  relocated	  to	  the	  straight	  sec8ons	  on	  ether	  side	  of	  the	  IP	  in	  Aug.2015.	

2016/6/13	

KEKB	  Review	  2016	Tunnel	  mo8on	  monitoring	A	  clear	  8dal	  (ver8cal)	  mo8on	  is	  seen	  around	  the	  IP.	  
The	  amplitude	  is	  ~20µm	  (P-­‐P)	  during	  this	  period.	  

1	  day	
IP	  sank	  with	  respect	  to	  the	  ends	  of	  the	  straight	  sec8ons	  by	  ~0.6mm	  due	  to	  heavy	  rainfall	  in	  the	  area.	
2016/6/13	

KEKB	  Review	  2016	Tunnel	  mo8on	  monitoring	
HLS	  data	The	  2016	  Kumamoto	  earthquake	  (magnitude	  7.3)	  hit	  Kumamoto.	  
It	  took	  ~	  4	  minutes	  for	  the	  seismic	  wave	  to	  arrive	  at	  the	  SuperKEKB	  ring.	  	  It	  disturbed	  the	  accelerator	  components	  but	  the	  abort	  system	  for	  the	  circula8ng	  beams	  was	  not	  triggered.	  	
Orbit	  diﬀerence	  During	  the	  EQ	  –	  before	  EQ	  (top)	  Aser	  the	  EQ	  –	  before	  EQ	  (bodom)	  2016/6/13	

KEKB	  Review	  2016	

We	  came	  a	  long	  way	Magne8c	  ﬁeld	  measurements		  coupling	  between	  adjacent	  magnets	

2016/6/13	

KEKB	  Review	  2016	

Magne8c	  coupling	  between	  adjacent	  steering	  magnet	  and	  Quadrupole	  magnet	  was	  evaluated	  &	  measured	  by	  K.	  Egawa	

2016/6/13	

KEKB	  Review	  2016	

Magne8c	  coupling	  between	  adjacent	  wigglers	  was	  evaluated	  &	  measured	  by	  K.	  Egawa	3. For	  Phase	  II	

Prepara8on	  for	  New	  IR,	  Installa8on	  &	  alignment	  of	  the	  QCS	  magnet	  system,	  	  	  design	  and	  fabrica8on	  of	  the	  collision	  FB	  (“iBump”	  )magnets,	  building	  the	  dithering	  system,	  and	  so	  on.	  	  Survey	  of	  the	  rings	  aser	  a	  long	  shut-­‐down	  and	  before	  Phase	  II.	  
Alignment	  of	  the	  ring	  magnets,	  if	  needed.	  
2016/6/13	

Summary	
•The	  SuperKEKB	  MR	  magnet	  system	  was	  completed	  in	  8me	  for	  Phase	  I	  commissioning.	  	  •The	  predic8on	  for	  the	  circumference	  agreed	  with	  the	  actual	  circumference	  within	  1	  ppm	  accuracy	  and	  the	  diﬀerence	  in	  the	  circumference	  in	  both	  rings	  was	  found	  to	  be	  a	  couple	  of	  hundred	  microns,	  which	  contributed	  to	  a	  smooth	  start-­‐up	  of	  the	  MR.	  
•We	  would	  like	  to	  add	  more	  (BINP)	  HLS	  sensors	  to	  monitor	  the	  tunnel	  level	  change,	  especially	  at	  the	  IP	  &	  LCC	  sec8ons.	  
•The	  power	  supply	  system	  is	  up	  and	  running	  smoothly	  with	  very	  high	  stabilityèT.	  Oki’s	  talk.	  
2016/6/13	

KEKB	  Review	  2016	

Summary	
•We	  will	  inves8gate	  any	  problems	  found	  	  by	  beam	  commissioning:	  •Misalignment	  if	  any,	  •Improvement	  in	  the	  magnet	  data	  •Magne8c	  coupling	  of	  wigglers,	  near-­‐by	  magnets,	  for	  example.	  
•We	  are	  preparing	  for	  the	  installa8on	  of	  the	  QCS	  system,	  which	  will	  take	  place	  in	  the	  summer,	  2016.	  
•We	  have	  started	  to	  work	  closely	  with	  	  the	  QCS	  group	  on	  the	  alignment	  of	  	  	  the	  Single	  Stretched	  Wire	  (SSW)	  system,	  	  which	  aﬀects	  the	  cryostat	  alignment	  to	  KEKB	  Review	  2016		  the	  beam	  line.	  2016/6/13	

KEKB	  Review	  2016