March 15, 2018

Phase 2
Commissioning
Plan
Y. Ohnishi / KEK@ KEKB Review 2018

Note: IP feedback system and the dithering system are omitted in this talk.
See T. Oki’s talk at the 19th KEKB Review.

Target of Commissioning in Phase 2

Verification of Nano-Beam Scheme
Low Emittance with Large Piwinski Angle
Specific Luminosity, Lsp > 4 x 1031 [cm-2s-1/mA2]
Beam-Beam Parameter, ξy > 0.05

cf. Lsp = 1.7x1031@KEKB

Reduce Beam Background for Belle II detector before we move on Phase 3
Background from stored beam : lifetime ~ 40 min in LER for 1 A
Background from injected beam
Movable collimator system works to reduce backgrounds
Phase-2 commissioning is only 4 months from mid of March to mid of July.
2

Verification of Nano-Beam Scheme
Step 1
Detuned beta at IP to find closed orbit as much as possible.
Test of QCS system(Final Focusing), Optics measurements and corrections

Local bumps in IR, TbT measurements, Final Quads excitation, …
X-Y couplings and vertical dispersions should be corrected in the IR region
consistent with those of arc sections.
Step 2Collision tuning with squeezing beta at IP and luminosity run
Tentative target is 1034 cm-2s-1 (KEKB design)
Beam current for LER is 1 [A] and 0.8 [A] for HER (design of 30 %)Back ground study for Belle II detector with collimator controls
Step 3 (very challenging)
Further squeezing beta at IP.
Target luminosity is 2 x 1034 cm-2s-1 (recorded peak at KEKB)
3

Beta Functions in Phase 2
Phase 2.0: No collision, extremely large beta at IP, do IR optics study
Phase 2.1: Vacant phase (for backup study, βy* ~ σz if necessary)
Phase 2.2 - 2.4: Collision tuning with background study
Beta functions in the horizontal (x) and vertical (y) direction
LER

HER

Phase
βx* [mm]

βy* [mm]scale

βx* [mm]

βy* [mm]

scale

2.0*

384

48.6

12 x 180

400

81

16 x 270

2.2

256

2.16

8x8

200

2.4

8x8

Step 1

Step 2

2.3

128

2.16

4x8

100

2.4

4x8

2.4

128

1.08

4x4

100

1.2

4x4

Step 2

3.x

32

0.27

1x1

25

0.30

1x1

Ultimate
4

Beta Function at IP and Depth of Field
Overlap region is indicated by dashed lines, which is depth of field. βy* should be larger than depth of field.

KEKB

Phase 2.3
4x8

Side-view⇤y = 252 [nm]x [mm]

x [mm]

Large depth of field

Top-view~10 mmPositronElectron⇤y = 2 [mm]~0.8 mm

s [mm]
SqueezingBeta

x [mm]⇤
y = 1 [mm]~0.8 mm

SqueezingBeta

x [mm]

Phase 2.4
4x4⇤
y = 126 [nm]s [mm]

Phase 3.x
1x1⇤
y = 50 [nm]⇤y = 0.3 [mm]~0.5 mm5

History of Vertical Beta Function at IP

⇤
y [m]

> Depth of Field

SuperKEKB is trying to make the smallest βy* in the world !
PEP
SPEAR

VEPP-2000

LEP, BEPCPETRATRISTANCESR-CPEP-II

BEPC-II

CESR
DAFNE
KEKB

SuperKEKB
Phase 2.2 - 2.3

SuperKEKB
Phase 2.4

FCC-eeCEPC

Ultimate
SuperKEKB
Phase 3.x

Year
6Piwinski Angle
Piwinski Angle

=

z
tan
⇤
x

x

Large PA canmake small βy*.

z

⇤
y >
<latexit sha1_base64="SHxmx4ejOOLhKTGgDnc5gJASgsg=">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</latexit>

HER

Phase 2.3
LER(4x8)
HER

Phase 2.4
LER(4x4)
HER

Phase 3.x
LER(1x1)
HER

256

200

128

100

128

100

32

25

5.9

2.16

2.40

2.16

2.40

1.08

1.2

0.27

0.30

18

24

2.1

4.6

2.1

4.6

2.1

4.6

3.2

4.6

εy/εx [%]

3

2.5

0.27

0.28

σx* [μm]

103

116

23.2

30.3

16.4

21.4

16.4

21.4

10.1

10.7

σy* [nm]

1900

1900

476

743

252

393

126

197

48

62

σz [mm]

7

7

6

5

6

5

6

5

6

5

KEKB (2006)

Phase 2.2

LER

HER

LER

βx [mm]590

560

βy [mm]6.5

εx [nm]11

φx [mrad]

𝜱

0.75

5.0

1.4

41.5
0.66

Remark 1.72x1034 cm-2s-1
No crab-crossing

10.7

0.7

41.5
8.2

1034 cm-2s-1

15.2

41.5
9.7

2x1034 cm-2s-1
7

15.2

41.5
9.7

4x1034 cm-2s-1

Large Piwinski Angle

24.7

19.4

8x1035 cm-2s-1
cf. DAFNE: PA = 2

Luminosity and Beam-Beam Parameter
Luminosity
N + N nb f 0
L=
RL
⇤
⇤
4⇡ x ySpecific Luminosity
Lsp =<latexit sha1_base64="/inucy9V9VijPqikLRNuFMEMoLA=">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</latexit>

Lnb Ib+ Ib

N:
n b:
f0:
R L:
σ*:
Ib:
φ x:

number of particles per bunch
number of bunches
revolution frequency
reduction factor
beam spot-size at IP
bunch beam current
half crossing angle

1
RL
⇠y+
=
/
2
⇤
⇤
4⇡e f0 x y
Ib y⇤

Beam-Beam Parameter and Luminosity<latexit sha1_base64="fiTy6pWj9Y2mYYgO5nvXxtLhrBw=">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</latexit>

small βy* requires small εys
to keep ξy
⇤
⇤
re y+
N
N
y
⇠y+ =
R
/
⇠y
⇤
⇤
⇤
2⇡ + y ( x ,ef f + y )
"y
z x
!
⇤
nb Ib+ ⇠y+ RL
N+ N
+
y
p
L=
1+ ⇤
/
⇤
2ere
R⇠ y
"y y⇤
z x
y
x,ef f<latexit sha1_base64="KI8krUvP3HzOiOUTPht/cbRSaEg=">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</latexit>

8Machine Parameters
SuperKEKB can exceed the peak luminosity of KEKB when we achieve ⇠y > 0.05
Phase 2.3 (4x8)
LER
IL x IH, nb

HER

Phase 2.4 (4x4) Phase 3.x (1x1)

LER

HER

LER

HER

1 A x 0.8 A, 1576 bunches (3-bucket spacing)

LER

HER

3.6 A

2.6 A

2500

2500

βx* [mm]

128

100

128

100

128

100

32

25

βy* [mm]

2.16

2.4

2.16

2.40

1.08

1.20

0.27

0.30

0.27

0.28

εy/εx [%]

5.0

1.4

0.7

ξx

0.00520.00200.00530.00210.00530.00210.00280.0012ξy0.02570.02640.04840.05000.04960.05050.08810.0807

Ibunch [mA]

0.64

0.51

0.64

0.51

0.64

0.51

1.44

1.04

L

1 x 1034[cm-2s-1](tentative target)

Lsp[cm-2s-1/mA2]

1.97 x 1031

2 x 1034

4 x 1034

8 x 1035

3.94 x 1031

7.88 x 1031

2.14 x 1032
9

Travel Guide for Phase 2 at SuperKEKB
We try to improve the specific luminosity with keeping bunch currents.
total luminosity lines

Lsp [cm 2 s 1 /mA2 ]Phase 2.4

Total current
is restricted
due to troubles.
500 mA x 400 mA
nb = 788

1000 mA x 800 mA
nb = 1576

1.5 A x 1.2 A
nb = 2364

L = LKEKB
optional

2.5 ⇥ 1 33
0

3 ⇥ 1 34
0 [coptionalincrease nb
keep Ib

Phase 2.3

Tentative target[cm 2 1s ]4 ⇥ 1 340 [c2 ⇥ 10 34

m

m

2

s

2

s

1

]

1

]

[cm 2s 1]
10 34 [cm 2s 1 KEKB]
5 ⇥ 10 33 [cm 2 1
s ]start !
Phase 2.2

250 mA x 200 mA
nb = 394

nb Ib+ Ib<latexit sha1_base64="olq3/X+mcls6a13kql4TFSdxIUs=">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</latexit>[mA2 ]

1.5 A x 1.2 A
nb = 1576
10

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]

Ring AcceptanceAx = 9.4 x 10-7 m
Ay = 6.8 x 10-9 m

Ax = 7.1 x 10-7 m
Ay = 1.1 x 10-7 m*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.
11

Injection Aperture: Phase 2.3
Phase 2.3 (4x8 βeta) no beam-beam
sextupole field error : 1 % of rated current
LER

HER

injection beam
acceptance window

normalized emittance of injection beam [m]12

Dynamic Aperture and Touschek Lifetimetransverse acceptancePhase 2.3 (4x8 βeta)
LER

HER

no beam-beamno beam-beamεy/εx = 1.4 %0.8 A / 1576 bunches
Lifetime = 189 minεy/εx = 1.4 %1 A / 1576 bunches
Lifetime = 60 min
momentum acceptance

momentum acceptanceDifference between without beam-beam and with beam-beam is less than 10 %.
The machine error reduces the dynamic aperture about 10 - 20 %.
We assume that total lifetime is 40 min in LER and 150 min in HER during Phase 2.
Loss rate = 26 GHz (1 A)

Loss rate = 5.6 GHz (0.8 A)
13

Lifetime and Injection Charge
100 % injection efficiency
Phase 3(ultimate)
Current RF system

Phase 3.x
ultimatePhase 2

LER in Phase 2.3<latexit sha1_base64="rRgHj3ans0GqFGdbZflEOhaexcY=">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</latexit>dN (t)
=
dt

N (t)
⌧
14

Schedule of February - July, 2018
e-

e+

HER

LER

BT: Beam Transport line (Linac-MR)

M

Jan.

February

Q

3

1

linac
DR

4

2

3

4

March
1

2

e+

3

April
4

1

2

3

May
4

1

2

3

June
4

1

2

3

July
4

1

2

e-

BT
2.0
2.1
2.2
2.3
2.4
remarkFirst collision(beam-beam deflection)

beta squeezing test
down to the final

collision tuning
15

Appendix

16

Alternative Machine Parameters
The vertical beam size of LER and HER are same.

17

QCS Setup
ESL (anti-solenoid)

QC

A1
B1
A2
B2
B4

ESR (anti-solenoid)

A1
B1
A2
B2
B4

2LP

A1
B1
A2
B2
A3

B3
B4
B5
B6

1LP

E

2R
C
Q

ESR2

E

1R
C
Q

CancelQC

B3

Total: 51 coils

A1
B1
A2
B2
A3

QC
1R

Q

LE
2
C
A1
B1
A2
B2
B4

LE
1
QC
A1
B1
A2
B2
B4

Cancel
B3
B4
B5
B6

P

A1
B1
A2
B2
B3
B4

B3

QC
2R

P

A1
B1
A2
B2
A3

ESR3

(ESR23)18

Misalignment of QCS in Phase 2.0
HER
x
(m)

LER
x
(m)

Δx = 500 µm @ QC1LE
y
(m)

x
(m)

Δx = 500 µm @ QC1LPy(m)

Δy = 500 µm @ QC1LEx(m)

Δy = 500 µm @ QC1LP
2.5 mm @ QC1P

2 mm @ QC1E

y
(m)

y
(m)

19

Beta Measurement by Quadrupole Excitation
βR
L =

βL
β* βm
l
ε
⌫L =
⌫R =
"=

=

m+

m

(l + ")2

l

QR

⇤

R =

m+

QL

L

K

4⇡
R

4⇡

m⇡

l K

(

"

L =

m

4l

"

m

βL and βR are averaged β functionsK)( ⌫L +

m+

R

")2

(l

2

m

⌫R )
⇤

=

m

⇢

⇣ ⇡ ⌘2
1+( ⌫L +
l K

⌫R )2
20

LER
LER
l = 0.93

βL = 338.7 [m]K1 = -1.7213 [1/m]βR = 338.6 [m]K1 = -1.7229 [1/m]Phase 2.3

SAD for Phase 2.3:
QC1LP : ΔK1/K1 = +0.1 %Δνy = +0.0374

βL = 273.14 [m]

QC1RP : ΔK1/K1 = +0.1 %Δνy = +0.0374

βL = 273.06 [m]If we change -0.1 %, beam iis unstable.
（tune should be changed higher than 0.57）
If we apply +0.1 % for left-side and -0.1 % for right-side,
the tune shift should be canceled.
⇤

=

m

⇢

⇣ ⇡ ⌘2
1+( ⌫L +
l K

⌫R )2
21

QC1LP (LER, Phase 2.3)
βL = 338.7 [m]average

4⇡ ⌫y
(m)
y =
| K1 |

Accuracy is 1 ~ 2 %| K1 | (1/m)

0.2 %
22

QC1RP (LER, Phase 2.3)
average

4⇡ ⌫y
(m)
y =
| K1 |

βR = 338.6 [m]| K1 | (1/m)

0.2 %
23

QC1LP (LER, Phase 2.3)

Leff = 0.3373 [m]K1 [1/m]s [m]βy [m]/users/onishi/svn-work/SuperKEKB/operation/ir-optics/beta-star

βy = 338.7 [m]average24

QC1 BPMs

MQC1L
MQC2L

MQC1R

MQC2R

25

Phase 2.0: TSUKUBA in HER
sher_5780_016270.sad

Tune:⌫x /⌫y = 44.55/43.573<latexit sha1_base64="tb1EjPFrCc43MsT14+5yns6NZTk=">AAACgHichVHLSsNAFD2N7/po1Y2gi2BRdJNOtMUHCIIbl7a1KqiUJE5raJqEJC3W4salP+DClYKouNJfcOMPuPATxKWCGxfepAFRUe8wM2fO3HPnzIxqG7rrMfYYEVpa29o7Orui3T29fbF4/8Caa1Udjec1y7CcDVVxuaGbPO/pnsE3bIcrFdXg62p5yd9fr3HH1S1z1avbfLuilEy9qGuKR1QhPrJlVgt7SX+siwtiKiWl02JSTE1L6ZnpQjzBJBaE+BPIIUggjBUrfoEt7MCChioq4DDhETagwKW2CRkMNnHbaBDnENKDfY4DRElbpSxOGQqxZRpLtNoMWZPWfk03UGt0ikHdIaWIMfbArtgLu2fX7Im9/1qrEdTwvdRpVptabhdiR0O5t39VFZo97H6q/vTsoYjZwKtO3u2A8W+hNfW1/eOX3Hx2rDHOztgz+T9lj+yObmDWXrXzDM+eIEofIH9/7p8gPyXNSXImlVicDX+iE8MYxQQ99wwWsYwV5OnYQ1ziBrdCizApJAW5mSpEQs0gvoQw/wEyOpEG</latexit>⌫s =0.0239<latexit sha1_base64="uMbF4g/LgjJgX/agB2lLxKX8gZ4=">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</latexit>

Vc = 11.2 M V<latexit sha1_base64="xIE7KJeJqe9/8Y8YCtzGbvl1+tE=">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</latexit>⇤⇤/xy = 400 mm/81 mm<latexit sha1_base64="RFv4B57qN4OaAIBt2mOS3zTrQGE=">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</latexit>

Emittance:"x = 4.5 nm<latexit sha1_base64="gaPxzlQnGBaN0j4C+kBDZOn8s30=">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</latexit>(w/o intra beam)

Beam stay clear:
AQC2<latexit sha1_base64="OVoGZh2XQF/ltnJiMK53URRbhvQ=">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</latexit>x

AQC1<latexit sha1_base64="KnANTTCeGxt4AALK9eQVMxf9giM=">AAACf3ichVG7SgNBFD2u7/iK2gg2YlCswl0RjIKg2FgaNSoYWXbXSRzcF7ubQFxS2PoDFlYKImKj32DjD1j4CWKpYGPhzWZBVNQ7zMyZM/fcOTNjeJYMQqLHFqW1rb2js6s71dPb1z+QHhzaDNyKb4qC6Vquv23ogbCkIwqhDC2x7flCtw1LbBkHy439rarwA+k6G2HNE7u2XnZkSZp6yJSWHi2WfN2MlrQov6zW61ExkGVb12r1hZmcls5QluIY+wnUBGSQxKqbvkQRe3BhogIbAg5CxhZ0BNx2oILgMbeLiDmfkYz3BepIsbbCWYIzdGYPeCzzaidhHV43agax2uRTLO4+K8cwQQ90RS90T9f0RO+/1oriGg0vNZ6NplZ42sDxyPrbvyqb5xD7n6o/PYcoIRd7lezdi5nGLcymvnp48rI+vzYRTdI5PbP/M3qkO76BU301L/Ji7RQp/gD1+3P/BIXp7FxWzc9kFnPJT3RhFOOY4ueexSJWsIoCH3uES9zgVlGUKSWrUDNVaUk0w/gSytwHiC+Tsw==</latexit>

= 60
= 48

y

(100 % coupling)

Octupoles at QC1LE, QC2LE are zero field.
SLY and SLX are almost zero field
26

Phase 2.0: TSUKUBA in LER
sler_1704_012180.sad

Tune:⌫x /⌫y = 44.55/46.58<latexit sha1_base64="UMtQHkC+K+h65AVBP+DAk1gXQ4c=">AAACgXichVFNS8NAEH2N3/Wr6kUQIVgU8RCn0mpVhIIXj35VBZWSxFWDaRKStFiLJ2/+AQ+eFETEm/4EL/4BD/4E8ajgxYOTNCAq6iy7M/N23uzbXc0xDc8neoxJdfUNjU3NLfHWtvaOzkRX94pnl1xd5HXbtN01TfWEaVgi7xu+KdYcV6hFzRSr2t5ssL9aFq5n2NayX3HEZlHdsYxtQ1d9hgqJ/g2rVNiXR+XAV+QZOZ1WMhnO0+NKJltIJEmh0OSfQSoKkohs3k5cYgNbsKGjhCIELPgcm1Dh8VhHCgSHsU1UGXM5MsJ9gUPEmVviKsEVKqN7vO5wth6hFudBTy9k63yKydNlpoxBeqAreqF7uqYnev+1VzXsEWipsNdqXOEUOo97l97+ZRXZ+9j9ZP2p2cc2sqFWg7U7IRLcQq/xywcnL0tTi4PVITqnZ9Z/Ro90xzewyq/6xYJYPEWcPyD1/bl/BvkxZVJJLaSTuWz0E83owwCG+bknkMMc5pHnY49whRvcSvXSiETSWK1UikWcHnwxafoDfHiRIQ==</latexit>⌫s =<latexit sha1_base64="veQLF4FwYN3G7TYZKpbYrvHnGvI=">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</latexit>

0.0232

Vc = 8.8 M V<latexit sha1_base64="G3ylvHiMU1Xbib4p2L6I6IhPHHc=">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</latexit>⇤⇤/xy = 384 mm/48.6 mm

Emittance:<latexit sha1_base64="OIUepwIhubiIePii4T3eOpvR/jc=">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</latexit>"x = 2.07 nm<latexit sha1_base64="ZfuoHAxaamcIjb3NBqW1+JfuDzg=">AAACfHichVFdKwRRGH52fK31tbhRbibbSsn2rsRSSrlx6WtRaJsZxzqZr2ZmN2z8AH/AhSsiSfwJN/6ACz9BLik3indnp4TwTnPO8z7nfd7znHN015R+QPQQU+rqGxqb4s2Jlta29o5kZ9eS75Q8Q+QNx3S8FV3zhSltkQ9kYIoV1xOapZtiWd+erq4vl4XnS8deDHZdsW5pRVtuSkMLmCoke9bKmidcX5qc7aiT6nCGxtQD2yokU5ShMNSfIBuBFKKYdZIXWMMGHBgowYKAjYCxCQ0+f6vIguAyt44Kcx4jGa4L7CPB2hJXCa7QmN3mscjZasTanFd7+qHa4F1M/j1WqkjTPV3SM93RFT3S26+9KmGPqpddnvWaVriFjsOehdd/VRbPAbY+VX96DrCJXOhVsnc3ZKqnMGr68t7R88LEfLrST6f0xP5P6IFu+QR2+cU4nxPzx0jwA2S/X/dPkB/OjGeycyOpqVz0EnH0og8DfN1jmMIMZpHnbQ9whmvcxN6VtDKoDNVKlVik6caXUEY/AB6lkpQ=</latexit>(w/o intra beam)

Beam stay clear:
AQC2<latexit sha1_base64="NifaFAJ4I0rH+/Ts++mO09QCWRI=">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</latexit>x

AQC1<latexit sha1_base64="wUPzX9nuyl2K2b/EIrpovbY1EYI=">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</latexit>

= 112
= 55

y

(100 % coupling)

Octupoles at QC1LP, QC2LP, QC1RP are zero field.
SLY and SLX are almost zero field
Rotatable sextupole: rotation angle = 0

27

Vertical Beam Size at X-ray Monitor
The key point is how we can suppress beam-beam blow-up.
aggressive
1%

nominal coupling in Phase 2
5%

LER

HER (new)y = 28 [m]@ Phase 2
magnetpolarity changeHER
y = 7.64 [m]@ Phase 1

Results
from Phase 1(w/o FF)

Larger beam size is betterto eliminate systematic error.

LER and HER achieved less than 1 % coupling during Phase 1.
28

Phase 2.0: X-ray Monitor in HER
X-ray monitor

sher_5780_016270_1.sad
y = 7.64 [m]Start-up lattice is the same of Phase 1
as much as possible.

wigglers

RF cavities
sher_5780_016270_2.sady = 28 [m]When we make a stable lattice above,
we will change a polarity of QS4OE
to enlarge the vertical beta at source point.

29

Phase 2.0: Dynamic Aperture for Injection in LER
sler_1704_012180.sad

injected beam

30

Phase 2.0: Dynamic Aperture for Injection in HER
sher_5780_016270_2.sad<latexit sha1_base64="E1/0xy51CaR0CqT7zSUBZ6ISmqo=">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</latexit>

y = 28 [m](X-ray monitor)

injected beam

31

Phase 2.0: Dynamic Aperture for Injection in HER
Abort Sextupole: OFF

sher_5780_016270_2.sad<latexit sha1_base64="E1/0xy51CaR0CqT7zSUBZ6ISmqo=">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</latexit>

y = 28 [m](X-ray monitor)

injected beam32

Movable Collimators (Masks)
D01H4 D01H5
D01V1

Belle II

D02H4 D02H3
D02V1

new type

KEKB type

BCG(Belle II Commissioning Group)
has a responsibility of movablemask control.
Compromise lifetime, injection,and detector background.
KEKB type
D06H4
D06H3

BCG

33

Phase 1 : Vacuum Scrubbing
Phase 1 (no QCS): Feb. - end of June, 2016

e-

e+
LER
(e+)

LER has stored 1 [A] beam current.

SuperKEKB control room

HER
(e-)

No QCS and Belle II

Beast II group34

Interaction Region

Belle II detector roll-in (April/11, 2017)
QCS: Backward position
Very strong focus magnets: QCS(Superconducting magnets)

Installation of QCS (Feb/13, 2017)35