Present Status ofVacuum System Construction
Y. Suetsugu
for KEKB Vacuum Group

Production
Installation
Schedule
Summary*Details about the pre-installation work and the beam collimators are presented
next by Shibata-san and Ishibashi-san, respectively.
*Vacuum system around IP is presented by Kanazawa-san.
2014/3/3

KEKB Review 2014

1

Production
LER (plan)Most of beam pipes and components are newly produced,
except for mainly Fuji straight section.
: New: Reuse

LC(Local chromaticity correction)

Rot. Sx

New: 93%(2610m/2800m)

Arcs
ChicaneWigglerWiggler

RF(ARES)(Phase I) Collimators

Injection
Abort
SRM FB, Mon.
2014/3/3

KEKB Review 20142

Production
LER (now)All beam pipes were ordered.
 Approximately 87 % of beam pipes have been delivered.
(2260m/2610m): Delivered: Not yetLC
(Local chromaticity correction)

Rot. Sx
Arcs
ChicaneWiggler

Wiggler

RF(ARES)(Phase I) Collimators

Injection
Abort
SRM FB, Mon.
2014/3/3

KEKB Review 20143

Production
LER (now)All beam pipes were ordered.
 Approximately 87 % of beam pipes have been delivered.
(2260m/2610m): Delivered: Not yetLC(Local chromaticity correction)

Rot. SxArcs
ChicaneWiggler

Wiggler

RF(ARES)(Phase I) Collimators

Beam pipes for Injection
arcs(aluminum-alloy)
Abort Beam pipes for wigglers
SRMfor FB, Mon.
Special thanks(OFHC)
BINP effort!
2014/3/3

KEKB Review 20144

Production
HER (plan)
Most of beam pipes and components are reused.
 Local chromaticity correction (LC) and wiggler sections
etc. are new.
: New

: ReuseLC(Local chromaticity correction)

New: 18%

Symmetry(500m/2800m)

Collimators(Phase I)

SRM
WigglerArcs
Injection
Abort FB, Mon.
2014/3/3

KEKB Review 20145

Production
HER (now)All beam pipes were ordered.
 Approximately 30 % of beam pipes have been delivered.
(150m/500m): Delivered (or reuse): Not yetLC(Local chromaticity correction)

Symmetry
Collimators(Phase I)

SRM
Wiggler

Arcs
Injection
Abort FB, Mon.
2014/3/3

KEKB Review 20146

Production
HER (now)All beam pipes were ordered.
 Approximately 30 % of beam pipes have been delivered.
(150m/500m): Delivered (or reuse): Not yetLC(Local chromaticity correction)Symmetry
Collimators(Phase I)

SRM
Beam collimators
Wiggler
Beam pipes for wigglers(OFHC)
Arcs

Beam pipes for arcs
(OFHC)
2014/3/3

Injection
Abort FB, Mon.
KEKB Review 20147

ProductionBeam pipes for LC under production
Basically the same design to the arc section.
 Use copper at upstream side considering background of the detector even for LER.
 HER ~270 m, LER ~270 m
 Including beam pipes for dithering coils.
50x44 ellipse+ Antechambers

f80+ Antechambers

f90+ Antechambers
The same to Arc

New antechamberfor HER
2014/3/3KEKB Review 20148

ProductionSpecial beam pipe under production - 1
Beam pipes for beam abort
 Ti window with a thickness of 1 mm
Ti Window

Ti Window
Abort beam

Beam dump

Circulating
beam

2014/3/3

KEKB Review 20149

ProductionSpecial chamber under production - 2
Branch chamber for X-ray line of XRM

Specialphoton stopat crotch

Circulating
beam

X-ray
See Flanagan’s talk2014/3/3

KEKB Review 201410

ProductionSpecial chamber under production - 3
Mirror chamber for SRM
MirrorWindow Support &Mirror

Cooling

Circulating
beam

2014/3/3

KEKB Review 2014Inside ofantechamberSR

See also Flanagan’s talk11

Installation
LER

Installation has almost finished for the delivered beampipes. (TiN coating and baking had finished.)
Installed: 82%: Installed: Not yetLC

(2130m/2610m)

Symmetry
Arcs

Rot. Sx

ChicaneWiggler

WigglerRF

Injection
Abort
SRM FB, Mon.
2014/3/3

KEKB Review 201412

Installation
LERInstallation has almost finished for the delivered beam
pipes. (TiN coating and baking had finished.)
Installed: 82%: Installed: Not yetLC

(2130m/2610m)

Symmetry
Arcs

Rot. Sx

ChicaneWiggler

Wiggler

Arc section

2014/3/3

RFInjection
Abort
SRM FB, Mon.
KEKB Review 2014

Wiggler section

13

Installation
LER

Installation has almost finished for the delivered beam
pipes. (TiN coating and baking had finished.)
Installed: 82%

LC(2130m/2610m)

Symmetry
Arcs

Problem:Interference with coils of
sextupole magnets was found at
the edges of beamChicane
pipe in theinstallation work. The
tolerance
Wiggler
was small even in the drawing.
The edges were cut in situ. to fit
in the magnet.

Cross section at
sextupole magnet
Rot. Sx

WigglerInterferenceRFInjectionAbort
SRM FB, Mon.
2014/3/3: Installed: Not yet

KEKB Review 2014

Cutting ofedges

14Installation
LER bellows chambers (evacuation)


Bellows chambers are installed and evacuated in some
sections (between gate valves): Installed, evacuated: Not yetVacuum: 32%(700m/2160m)

Arcs
ChicaneWigglerArcs

2014/3/3

Wiggler

Injection
Abort
SRM FB, Mon
KEKB Review 201415

Installation
LER bellows chambers (evacuation)


Bellows chambers are installed and evacuated in some
sections (between gate valves): Installed, evacuated: Not yetVacuum: 32%(700m/2160m)

Arcs
ChicaneWigglerArcs
Arc section

2014/3/3

Wiggler

Injection
Abort
SRM FB, Mon
KEKB Review 2014

Wiggler section

16

Installation
LER bellows chambers (evacuation)


Bellows chambers are installed and evacuated in some
sections (between gate valves): Installed, evacuated
Bellows: Notchambers
yet

Vacuum: 32%(700m/2160m)

Problem:
The rate of air leakageArcs
at connection
flanges are slightly higher in thetunnel than the case of
preChicane
processing at laboratory,i.e., ~10 %.
Wiggler
It may be due to some problem in themachining of sealing surface ofbellows chambers.
The investigation is on going.
ArcsAluminumgasketWiggler

Sealing surface
on the gasket
after fastening
Injection
Abort
SRM FB, Mon

2014/3/3

KEKB Review 201417

Installation
HER

Beam pipes for wiggler were installed, and evacuated.
(No TiN coating). Bellows chambers were also installed
partially.
: Installed (or reuse)
Installed: 24%

LC: Not yet

(120m/500m)

Vacuum: 16%(80m/500m)

Symmetry
Collimators(Phase I)

SRM
Wiggler
Arcs
Injection
Abort FB, Mon
2014/3/3

KEKB Review 201418

Installation

HER

Beam pipes for wiggler were installed, and evacuated.
(No TiN coating). Bellows chambers were also installed
partially.
: Installed (or reuse)
Installed: 24%

LC: Not yet(120m/500m)

Vacuum: 16%(80m/500m)

Symmetry
Collimators(Phase I)

SRM
WigglerArcs
Arc section

2014/3/3

Injection
Abort FB, Mon
KEKB Review 2014

Wiggler section19Replacement of bellows chamber
HER
Basically, bellows chambers are reused. But somebellows chambers should be replaced to new ones, since
their RF-shield fingers were found to be damaged by theEarthquake, 2011 March.
 The replacement is undergoing.
X-ray photogram
2014/3/3

Actual inside view of the same
bellows chambers
KEKB Review 201420

Status of other main items


Monitor and Control system
The control and monitoring system design follows that of theKEKB.
 The vacuum components are controlled based on EPICS.
 The old data acquisition system based on CAMAC and GPIB
is replaced by a new compact system based on Ethernet
protocols.
 Control of power supplies for NEG activation,
control of vacuum gauges and ion pumps,Old system
and gate valves were tested.
Monitor and control item
Vacuum switch (VSW)
Gate valve (GV)
Beam stopper
Ion pump (IP)Cold cathode gauge (CCG)
Power supply for NEG activation
Temperature sensor
Flow meter (existing)Flow meter (new for wiggler section)
2014/3/3

LER (positron)
3133
2307
307
171484

HER (electron)
3335
2307
307
241244376383KEKB Review 2014

New system
21

Status of other main items
Cooling system
The power losses are estimated to be approximately 16 MW intotal. The cooling power should be icreased due to the power
being a factor of two higher than that of KEKB.
 Because the dissipation of SR power is concentrated in thewiggler section and the downstream from it, the location ofcooling facilities and the pipe arrangement should beconsidered carefully.
Header system atwiggler section

Dissipated powerin the ring
2014/3/3

New layout
at arcKEKB Review 201422

Schedule

Rough schedule
2015

Place
Tsukuba straight section
LCArc (T-N)
Beam pipes
Nikko straight section
Beam pipes
Arc (N-F)
Beam pipes
Fuji straight section
SRM, XRM (LER)
Beam injection
Beam abort
MON, FB
Arc (F-O)
Beam pipes
Collimators
Oho straight section
Beam pipes
Beam Pipes (RF section)
SRM, XRM (HER)
Arc (O-T)
Beam pipes

4567

FY20149108
Installation

Installation
Installation

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Installation
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Installation
Installation11

vacuumvacuumvacuumvacuumvacuumvacuumCoating and baking
Cabling
Arc (F-O, O-T)
Tsukuba and Fuji
Cooling water
Nikko and Oho (wiggler)
Tsukuba and Fuji
Arc

2014/3/3

KEKB Review 201423

SummaryAll of components required for Phase I were ordered.
They will be delivered this fiscal year.

Installation of components into the tunnel are in progress.
No serious problem was found up to now. The installation
continues coordinating with other hardware works. (verycrowded in the tunnel)

Evacuation has started partially. Only rough pumping andleak check.

The installation and the final set up schedule seems very
tight from summer of next fiscal year… (Final leak check,
final alignment, baking of ion pumps, activation of NEG,
control system check, cooling water system check, etc.)

Thank you for the cooperation!
2014/3/3

KEKB Review 201424