Damping Ring Commissioning
Hiroshi Sugimoto
for SuperKEKB Commissioning GroupThe 22nd KEKB Accelerator Review Committee

Contents- Introduction- Commissioning Overview- Optics Measurement- Summary

2018/03/14

The 22nd KEKB Accelerator Review Committee2Introduction• Positron target at sector1-4
with L-band+S-bandstructure
SuperKEKB
PositronDamping
Ring(DR)• Capture + acceleration• Extract from Linac at 1.1GeV• After 2 linac-pulse, re-inject to the Linac
LTR linewith ECS
incorporated• 1.1•GeV
positronbeam
is injected from LINAC.
RTL
line
with
BCS
incorporated•
the campus
boundaryis nearistoextracted
the DR from DR and re-injected to LINAC.
• After
40 ms
storage,the beam• Note• Then accelerated up to 4 GeV and injected to the main ring (LER).

Campus boundary
1.1 GeV Damping
Ring

Pond



シャッ

ター







シャ
ッタ
ー



RTL
(BCS)

G9'

G8'

LTR
(ECS)

Electron

2018/03/14

G4'

G17

G5'

G11'

G16'

G14'

入射路

出射路

Electron Source

30

0.7084

20

0.525

10

G13'

0

To LER

PositronTargetThe 22nd KEKB Accelerator Review Committee

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Site
Campus Boundary
MachineBuilding

PS Building

We are here.
PS Building

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The 22nd KEKB Accelerator Review Committee5Layout• Consists of 2 arc 2 straight sections.
Injection SectionDR
C = 135m

LTR

RTL

Extraction Section
RF Section
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Hardware
DCCT

LTR(入射路)

Bunch Feedback
TiN coated chamber

Septum & Kickers

SeptumArc CellDR

RTL(出射路)C = 135m
RF Cavity
Magnets

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Hardware- Magnet (DC)
Bend : ７８ units
Steering : 88 units
Quadrupole : ８４ units
Sextupole : ７４ units- Transverse Bunch Feedback System- Beam Current Monitor
DCCT
CT (BPM bottom electrode)bunch current monitor- Magnet (AC)Injection&Extraction kicker
Injection&Extraction septum- RF Cavity：２ units- BPM (turn-by-turn): 83 units- Beam Pipe: ~110 units
Ante-chamber structure
TiN coated- Beam Size Monitor (SR):- Beam Loss Monitor:
ion chamber, optical fiber
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All systems are working well.

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Design Concept• Requirement on emittance

Should be less than 50 nm considering the coherent oscillation at
the LER injection and the dynamic aperture of LER.
--> No difficulty in achieving emittance of ~50 nmwith ordinary FODO lattice• Requirement on damping time

Beam emittance should be damped from 1400 nm
to 50 nm within 40 ms.
Damping time should be less than 12.8 ms
I
X
1
1
2
⌧/
ds
/
✓
bend
⇢2
bend

--> Apply negative bend to FODO cell.

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FODO Cell with Negative Bend
DR: Arccell• Apply negative bend to shorten the radiation damping time.
B2

x

y

Positive Bend (B1)

B1

xNegative Bend (B2)

B2

B1

QD

Quadrupole- B1 : Positive Bend (angle >0)- B2 : Negative Bend (angle <0)
Dipole field ~ 1.3 T
2018/03/14

r = 0.35
1 = 0.277

B1

QF

Sextupole

B2•Wide tunable range inmomentum compaction
10

The 22nd KEKB Accelerator Review Committee2Lattice Parameters
Optimized
for 8nC/Bunch
Machine Parametersof Positron
Damping Ring
Parameters

2018/03/14

Unit

Energy1.1

GeV

Circumference

135.498295

m# of bunch2# of bunch / train

2

Max. stored current

70.8

mA

Energy loss per turn

0.0847MV

Damping time (τx / τy / τz)11.5 / 11.7 / 5.8

msec

Emittance (εx /εy / εz)41.5 / 2.1 / 3600nm

εy / εx5%νx / νy / νs

8.240 / 7.170 / -0.0257

Energy spread

0.055

%

Bunch length

6.6

mm

Mom. Comp. factor

0.0141# of cells

32

Total RF voltage

1.4

MV

RF frequency

509

MHz

The 22nd KEKB Accelerator Review Committee

8nC/bunch
spdr_0029.sad
02/07/2018

11

Lattice Preparedfor BeamofCommissioning
Machine Parameters
Positron Damping Ring
Parameters

Unit

Energy1.1

GeV

Circumference

135.498295

m# of bunch2# of bunch / train

2

Max. stored current

70.8

mA

Energy loss per turn

0.0847MV

Damping time (τx / τy / τz)11.5 / 11.7 / 5.8

msec

Emittance (εx /εy / εz)25.8 / 1.3 / 3400nm

εy / εx5%νx / νy / νs

9.240 / 7.170 / -0.017

Energy spread

0.055

%

Bunch length

6.2

mm

Mom. Comp. factor

0.0089# of cells

32

Total RF voltage

1.0

MV

8nC/bunch
spdr_0029_Vc1MV.sadRF frequency
2018/03/14

509

The 22nd KEKB Accelerator Review Committee

MHz

02/07/2018

12

Actual Operation
Parameters
Beam Commissioning
MachineParameters ininCommissioning
New Model

Parameters
Energy1.1

GeV

Circumference

135.498295

m# of bunch2# of bunch / train

2

Max. stored current

11

mA

Energy loss per turn

0.0847MV

Damping time (tx / ty / tz)

11.5 / 11.7 / 5.8

msec

Emittance (ex /ey / ez)

29.2 / 1.5 / 3630

nm

ey / ex5%nx / ny / ns

8.830 / 6.280 / -0.018

Energy spread

0.055

%

Bunch length

6.6

mm

Mom. Comp. factor

0.0100# of cells

32

Total RF voltage

1.0

RF frequency
2018/03/14

Unit

509

The 22nd KEKB Accelerator Review Committee

MV
MHz

Not confirmed

Not confirmed

0.7nC/bunch
spdr_0030_Vc1MV.sad

03/12/2018

13Commissioning Overview
Starts from 02/08

The First 3 Days
Injection SectionDR
C = 135m

LTR

RTL

Extraction Section
RF Section

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The First 3 Days
Injection Tuning

Septum Timing

Injection Section

Kicker TimingDR
C = 135m

LTR

RTL

Extraction Section
RF Section

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The First 3 Days
Injection Tuning

Septum Timing

Injection Section

Kicker Timing

LTR

BPM TimingDR
C = 135m

Orbit Tuning

RTL

Extraction Section
RF Section

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The First 3 Days
Injection Tuning

Septum Timing

Injection Section

Kicker Timing

LTR

BPM TimingDR

RF Capturing
C = 135m

Orbit Tuning

RTL

Extraction Section
RF Section

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The First 3 Days
Injection Tuning

Septum Timing

Injection Section

Kicker Timing

LTR

BPM TimingDR

RF Capturing

RTL

C = 135m

Orbit Tuning

Extraction Section
Septum Timing

Kicker Timing

RF Section
Extraction Tuning

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The First 3 Days
Injection Tuning

Septum Timing

Injection Section

Kicker Timing

LTR

BPM TimingDR

RF Capturing

RTL
RTL
Tuning

C = 135m

Orbit Tuning

Extraction Section
Septum Timing

Kicker Timing

RF Section
Extraction Tuning

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The First 3 Days
Injection Tuning

Septum Timing

Transport to the LINAC end

Injection Section

Kicker Timing

LTR

BPM TimingDR

RF Capturing

RTL
RTL
Tuning

C = 135m

Orbit Tuning

Extraction Section
Septum Timing

Kicker Timing

RF Section
Extraction Tuning

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Overview• Rough tuning has been successfully finished within the first 3 days.

• Then, we started fine tuning of LTR, DR and RTL including LINAC.

- Test of operation mode (repetition rate, # of pulse and # of bunch)- Hardware startup and calibration.
- Software/hardware bug hunt
- Optics study- etc.
• Vacuum scrubbing of beam pipes is progressingin parallel to beam tuning.
• National inspection of the DR facility has been successfully passed.
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Operation History• DR ring was started up very smoothly.
• No fundamental problem in the commissioning period.
• Maximum beam current so far is 11 mA (2 pulse x 2 bunch)• No serious vacuum pressure raise is observed.

Shibata-san’s talk

• Beam dose is ~0.7 Ah

2018/03/14

2 bunch 2 pulse
is available

With FC operation
is available

Kicker trouble

The 22nd KEKB Accelerator Review Committee

Trouble in electric
power substation
Vacuum Pressure [Pa]Beam Current [mA]

• Ready for Phase 2 operation23

Beam Size Measurement

H. Ikeda• Transverse beam profile obtained with a gated camera.
1st turn

After 20ms

After 1ms

After 10ms

After 200 ms• Damping of both transverse and longitudinal beam sizes

is confirmed qualitatively.
• Further calibration and data analysis is ongoing.
Ikeda-san’s talk2018/03/14

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Beam Optics Measurement

Optics Tuning• Numerical simulation study showed,- No elaborated low emittance tuning is necessary.
- Orbit correction is sufficient to reach target emittance coupling of 5~10%• Limited # of tuning knobs compared to the main ring.

# of independent quadrupoles is 30 (Two in arc cell and 28 in straight sections)• Total number of turn-by-turn (TbT) BPMs is 83.

- COD measurement with averaging mode is mainly used in the optics study.
- TbT mode is mainly used in injection tuning.
• Correction with bump orbit is limited by maximum field strength of steering magnets.

• Only betatron and horizontal dispersion functions are consideredin the optics correction.
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Tune Estimation at the Frist Injection Tuning• Original tune of the model lattice (⌫x ,⌫y ) = (9.24, 7.17)• Tune scan is performed using the model lattice.
• Finally, the model lattice tune arrived at(⌫x , ⌫y ) = (9.10, 7.02)• While measured tune evaluated with TbT BPM (⌫x , ⌫y ) = (Nx<latexit sha1_base64="2uyaQAGcS/mdOQpMEpa2+KOVbzk=">AAACpHichVFNL8RQFD3qa3wPNhKbiQlGjOZ1IvGRSISNDcEoEh9NWw+NTtu0nYkxYWnhD1hYkVgIW/wAG3/Awk8QSxIbC7edJoLgNu0977x7bs97V3NMw/MZe6wQKquqa2pjdfUNjU3NLfHWtkXPzrs6l3XbtN1lTfW4aVhc9g3f5MuOy9WcZvIlbWcy2F8qcNczbGvBLzp8LaduWcamoas+UUo8kVq18spu+iBIxb6x1IyyOyBKQ+kZpdgvZob7lHiSiSyMxE8gRSCJKGbt+C1WsQEbOvLIgcOCT9iECo+eFUhgcIhbQ4k4l5AR7nPso560eariVKESu0PfLVqtRKxF66CnF6p1+otJr0vKBLrZA7tgL+yeXbIn9v5rr1LYI/BSpKyVtdxRWo46sm//qnKUfWx/qv707GMTw6FXg7w7IROcQi/rC3vHL9nR+e5SDztjz+T/lD2yOzqBVXjVz+f4/MkffjTyQjdGA5K+j+MnkDPiiCjNDSbHJ6JJxdCJLqRoHEMYxxRmIVP7Q1zhGjdCrzAtZAW5XCpURJp2fAlh/QOTEZpl</latexit>.17, Ny + .28)

• Guess the integer part from the model lattice,(⌫x , ⌫y ) = (8.83, 7.28)
and real lattice is( ⌫x ,<latexit sha1_base64="NFY3cxHBj/RH6DtJadQELWeufVY=">AAACs3ichVHLSuRAFD3Gx6jjo9WNMJtgo7SgPbdl0NGVqAuXvnoUjDRJLJ3CvEiqG3sa5wNmLy5cOeBC/AAXLlXwB1z4CYNLBTez8HY64Av1hlSde+qem1O5VuDISBFd12n1DY1Nn5pbWj+3tXd0prq6f0R+MbRF3vYdP1yxzEg40hN5JZUjVoJQmK7liGVra7p6vlwSYSR9b0mVA7Hmmpue3JC2qZgqpL5mjBnhKFM3vGJhe+j3k6w8qBuRdPXMMGVHxoZ0XkcHC6k0ZSkO/TXIJSCNJOb81AkMrMOHjSJcCHhQjB2YiPhZRQ6EgLk1VJgLGcn4XGAHrawtcpXgCpPZLV43OVtNWI/zas8oVtv8FYffkJU6+umKjuiWLumY/tH/N3tV4h5VL2XerZpWBIXOP72L9x+qXN4Vfj6q3vWssIHvsVfJ3oOYqd7CrulLv/ZuFycW+isD9Jdu2P8BXdMZ38Ar3dmH82Jh/x0/FnvhP8YDyr0cx2uQH8mOZ3Pz39KTU8mkmvEFfcjwOMYwiVnMIc/td3GKc1xoo5qhWdp6rVSrSzQ9eBaa+wAX7594</latexit>⌫y ) ⇠ ( 0.27, 0.26)• COD response due to dipole kick is

Amplitude [arb. unit]• Thus, the difference between the modelFFT Spectrum of Vertical Motion

measured to ensure the integer part.

~ 0.28Fractional tune

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Closed Orbit Response from Dipole Kick
• Compare with the model lattice(⌫x , ⌫y ) = (8.83, 7.28)• Integer part of vertical tune seems to be smaller.

Horizontal dipole kick<latexit sha1_base64="AlQCPvzwu5Y4TSnd1UMHUf95oF8=">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</latexit>

x/ K0 [m/rad]
Blue: Measurement
Red: Model

Vertical dipole kick<latexit sha1_base64="keuL+BKKanJwSywokOhbOXur7RE=">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</latexit>

y/ K0 [m/rad]Injection section

Position s [m]<latexit sha1_base64="1CGAnxwsL5bBSbRSzcKlmPmMz/0=">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</latexit>

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Closed Orbit Response from Dipole Kick
• Adjust the integer part of the model vertical tune.

(⌫x , ⌫y ) = (8.83, 6.28)<latexit sha1_base64="z8858vnbqitq2pXsDLJ+OxSk7GA=">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</latexit>• Good agreement between the model and measurement
Horizontal dipolåçe kick<latexit sha1_base64="AlQCPvzwu5Y4TSnd1UMHUf95oF8=">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</latexit>

x/ K0 [m/rad]
Blue: Measurement
Red: Model

Vertical dipole kick<latexit sha1_base64="keuL+BKKanJwSywokOhbOXur7RE=">AAACqnicSyrIySwuMTC4ycjEzMLKxs7BycXNw8vHLyAoFFacX1qUnBqanJ+TXxSRlFicmpOZlxpaklmSkxpRUJSamJuUkxqelO0Mkg8vSy0qzszPCympLEiNzU1Mz8tMy0xOLAEKxQuoxbik5pQkKlQq6CtAmd7xBnUxuYklGUW51dG5+kWJKbG18QLKBnoGYKCAyTCEMpQZoCAgX2A7QwxDCkM+QzJDKUMuQypDHkMJkJ3DkMhQDITRDIYMBgwFQLFYhmqgWBGQlQmWT2WoZeAC6i0FqkoFqkgEimYDyXQgLxoqmgfkg8wsButOBtqSA8RFQJ0KDKoGVw1WGnw2OGGw2uClwR+cZlWDzQC5pRJIJ0H0phbE83dJBH8nqCsXSJcwZCB04XVzCUMagwXYrZlAtxeARUC+SIboL6ua/jnYKki1Ws1gkcFroPsXGtw0OAz0QV7Zl+SlgalBs/G4JwnoFmCIASPIED06MBmhRnqWeoaBJsoOTtCY4mCQZlBi0ABGhzmDA4MHQwBDKND4HoZNDLsZ9jDpMgUzRTJFQ5QyMUL1CDOgAKYUALKwnmI=</latexit>

y/ K0 [m/rad]Injection section

Position s [m]<latexit sha1_base64="1CGAnxwsL5bBSbRSzcKlmPmMz/0=">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</latexit>

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Initial Correction to Remove the Tune Difference• Rough correction quadrupole families to make the model and the realtunes are consistent each other.
Bule: QF and QD magnets in arc cells (Two families)
Red: Quadrupole magnets at straight sections (Total 28 units)<latexit sha1_base64="238bGZf7Ab2popdPemqdl9POyDY=">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</latexit>

Independent quadrupole magnets for dispersion
suppression

K1 /K1 [%]Injection section

Position s [m]<latexit sha1_base64="1CGAnxwsL5bBSbRSzcKlmPmMz/0=">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</latexit>• Large correction factor of 5~10% level.
• Assume this factor to in the following optics study.
2018/03/14

The 22nd KEKB Accelerator Review Committee

30

Beta Function and Dispersion• Beta function is extracted from COD response from dipole kicks• Dispersion function is measured by changing frequency of RF cavity.

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⌘x [mm]⌘y [mm]K1 /K1 [%]Position s [m]Injection section<latexit sha1_base64="1CGAnxwsL5bBSbRSzcKlmPmMz/0=">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</latexit>((<latexit sha1_base64="yH5DYeqkxwPuFoW+vm93u0yW/yY=">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</latexit><latexit sha1_base64="JpzQqcpAL4HtF7ehpdPnc4MKLas=">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</latexit>

2018/03/14

x / x )rms ⇠ 25 %y / y )rms ⇠ 18 %( ⌘x )rms ⇠ 29 mm( ⌘y )rms ⇠ 5 mm<latexit sha1_base64="fp91E6lK0/BpbUk9j3Ia9F1QKgU=">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</latexit><latexit sha1_base64="MnbTRS3+IzpOWRhYa/FJPHqbmMM=">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</latexit>

The 22nd KEKB Accelerator Review Committee

31

Beta Function and Dispersion• Correction with All (30) quadrupole families.

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⌘x [mm]⌘y [mm]K1 /K1 [%]Position s [m]Injection section<latexit sha1_base64="1CGAnxwsL5bBSbRSzcKlmPmMz/0=">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</latexit>((<latexit sha1_base64="avLZlDKwLpU29DUdm1qfGHu41Ms=">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</latexit><latexit sha1_base64="VjHVXobD+k3xNd7WuQvJ5wLwI3M=">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</latexit>

2018/03/14

x / x )rms ⇠ 9 %y / y )rms ⇠ 10 %( ⌘x )rms ⇠ 17 mm( ⌘y )rms ⇠ 5 mm<latexit sha1_base64="uDoVVnjmodB+129QV0MOc91jqQk=">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</latexit><latexit sha1_base64="MnbTRS3+IzpOWRhYa/FJPHqbmMM=">AAACvXichVG7ThtBFD0sIRACwYEmEo0VCwSNNY6CeFQWpEjJIw5ILFrNbsb2iJnd1ezYkbHMB/ADFBQokVJEfEA+IIpEBRUFnxClJFKaFLleL0IEhdzV7Jw5c8+dM3P9WMnEMnbZ5/Q/GHg4OPRo+PHI6JOx3NPxt0nUMIGoBJGKzJbPE6FkKCpWWiW2YiO49pXY9HdXuvubTWESGYVvbCsWO5rXQlmVAbdEeblFV4mqnXFfCWV53hWWey3XyFrdznqu5rZudNvopOMmUufn9q8prTtersCKLI38XVDKQAFZrEa5L3DxDhECNKAhEMISVuBI6NtGCQwxcTtoE2cIyXRfoINh0jYoS1AGJ3aX/jVabWdsSOtuzSRVB3SKomFImccUu2Cf2RU7ZSfsO/v9z1rttEbXS4tmv6cVsTd28Gzj139VmmaL+o3qXs8WVSykXiV5j1Ome4ugp2/uHV5tLK1PtafZR/aD/H9gl+wr3SBs/gw+rYn1o3v8+OSFXowaVPq7HXdB5UVxsVhae1koL2edGsIknmOG2jGPMl5jFRUqf4xvOMO5U3aqjnLCXqrTl2kmcCuc938A7WioDw==</latexit>

The 22nd KEKB Accelerator Review Committee

32

Beta Measurement with Turn-by-Turn Data
• Excite betatron oscillation by transverse feedback kickers.
Green: Evaluated by COD based schemex / x [%]

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Position s [m]<latexit sha1_base64="1CGAnxwsL5bBSbRSzcKlmPmMz/0=">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</latexit>(<latexit sha1_base64="1VxshCEKnwD5FxMJT5bv1FmRTwo=">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</latexit>x / x )rms ⇠ 11 %(<latexit sha1_base64="ObEXMTaq1+V04liZAVUMSk7BRpc=">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</latexit>y / y )rms ⇠ 16 %• Detail study on TbT measurement and analysis will be performed.
2018/03/14

The 22nd KEKB Accelerator Review Committee

33

Tune Chromaticity• Measure betatron tune with changing the frequency of RF cavity.

VerticalHorizontal⌫x<latexit sha1_base64="5wqihbCWEsLlCf6v1JDdhgJc0kw=">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</latexit>

Measurement⌫y<latexit sha1_base64="dck9sOt2Ml6p8eFK8fz0+En44aY=">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</latexit>⇠y ⇠ 0.09⇠x ⇠ 0.15<latexit sha1_base64="wbfjWfW8C6omvAMfHJYuzjqcuhg=">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</latexit><latexit sha1_base64="e3oJc/4e2F7pn6VN3kluwz4ZrUw=">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</latexit>

Model⇠x ⇠ 0.11<latexit sha1_base64="FOmR+MWTZXO14OmVngOBoDaLSzk=">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</latexit>

⇠y ⇠

0.10

<latexit sha1_base64="2E03iHW9YRb7eTzui0z2XyqzQGM=">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</latexit>

p/p [%]

p/p [%]<latexit sha1_base64="4u+Wp4jnFqB4wwjKiTmSkOE9eIM=">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</latexit><latexit sha1_base64="4u+Wp4jnFqB4wwjKiTmSkOE9eIM=">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</latexit>• Deviation from the model value is less than 0.2 even without

any off-momentum optics correction.
2018/03/14

The 22nd KEKB Accelerator Review Committee

34

Synchrotron Tune

Y. Ohnishi• Measure synchrotron tune from TbT BPM data of the injected beamwith energy offset.

meas
⌫s
=
⌫smodel =0.0185<latexit sha1_base64="IY2mL9Ahob9YwjJ3D+D2UmsXnAM=">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</latexit>• Good agreement with the model lattice.

0.0185<latexit sha1_base64="G5SCxO0QmxHtJSqWKdZM5+4k6EQ=">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</latexit>

2018/03/14

The 22nd KEKB Accelerator Review Committee

35

Possible Source of the Large Correction Factors• Investigation performed so far- Magnetic interference between magnets?

-> 10% is too big- Bugs in lattice modeling? (Main bend magnet has large saggita)-> Not found so far- Residual current loop in the tunnel?

-> Not found so far- Bugs in the excitation curve?

-> Not found so far- Calibration errors in field measurement?

-> 10% is too big• Plan to perform optics study at a drastically different tune point.
Check correction factor after the optics correction,
If the correction factor stays in same level-> Quadrupole magnets are really suspicious.
If the correction factor changes-> Unexpected quadrupole field in the beam line.

• Plan to perform field measurement by an other system.
2018/03/14

The 22nd KEKB Accelerator Review Committee

36Summary• DR ring operation was started up very smoothly.
• No fundamental difficulty in the beam commissioning.
• Inexplicably-large correction factor to quadrupole magnets

is necessary for better orbit&optics control.
• Beam size and bunch length in DR are not confirmed yet.
• We are ready for Phase 2 operation.
Long-term stability of DR will be tested in Phase 2 operation.

2018/03/14

The 22nd KEKB Accelerator Review Committee

37

Thank you for attention

2018/03/14

The 22nd KEKB Accelerator Review Committee38

DR Optics

2018/03/14

The 22nd KEKB Accelerator Review Committee39

DR Optics - Arc Cell -2018/03/14

The 22nd KEKB Accelerator Review Committee40

DR Optics - Injection Section -2018/03/14

The 22nd KEKB Accelerator Review Committee41

DR Optics - Extraction Section -2018/03/14

The 22nd KEKB Accelerator Review Committee

42

Measured Beta Function at Injection Section
Green: Evaluated by COD based scheme

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The 22nd KEKB Accelerator Review Committee43

Y. Ohnishi
Requirements for LINAC in Phase-2

Positron
LER 4 GeVElectron
HER 7 GeV

Normalized emittance*1
γβεx / γβεy200 / 40 [μm] with DR

150 / 150 [μm]*2

Energy spread*3
σδ0.16 [%]

0.10 [%]

Bunch charge at
injection point*4

0.5 [nC]

1.0 [nC]*1 Area of 95.4 % occupied by particles defines ±2σ. The emittance is derived from σ.
*2 100 μm is preferable for Phase 2.4(4x4).
*3 Energy acceptance is 3 σ.
*4 Charge intensity of one bunch. Double for 2-bunch injection.

Thermionic gun is available for HER injection in Phase 2.
Damping Ring is necessary for LER injection.
14

2018/03/14

The 22nd KEKB Accelerator Review Committee

44Machine Parametersin Phase
III
MachineParameters
2013/July/29

LER

HER

unit

E

4.000

7.007

GeV

I

3.6

2.6

A

1.04

mA

2,500

Number of bunches
Bunch Current

1.44
3,016.315

Circumference

m

εx/εy

3.2(1.9)/8.64(2.8)

4.6(4.4)/12.9(1.5)

Coupling

0.27

0.28

βx*/βy*32/0.27

25/0.30
83

Crossing angle

nm/pm():zero current
includes beam-beam

mm
mrad

αp

3.18x10-4

4.53x10-4σδ

8.10(7.73)x10-4

6.37(6.30)x10-4

Vc

9.4

15.0

MV

σz

6.0(5.0)5(4.9)mm

νs-0.0244-0.0280

νx/νy44.53/46.57

45.53/43.57

U0

1.86

2.43

MeV

τx,y/τs43.2/21.6

58.0/29.0

msec

ξx/ξy

0.0028/0.0881

0.0012/0.0807

Luminosity

2018/03/14

Y. Ohnishi

8x1035The 22nd KEKB Accelerator Review Committee():zero current():zero current

cm-2s-1

45

Irregular Signal of Injection Kicker

セラミックダクトのサポートで放電
していた

Kicker GND

真空ダクトのGNDが浮いていた？

• Discharge due to a floating GND?
• After changing grounding route, the Irregular signal is not observed.

2018/03/14

The 22nd KEKB Accelerator Review Committee

46