Installation of Crab cavity
KEK M. Ono07/March
Present Status of Tunnel; Nikko Straight Section
Installation Procedure
Schedule: Past/FutureCrab RF-driving System: Plane View
Crab: HER

Crab: LER

SCC; D10SCC; D11Nikko
Exp. Hall

78 m

SCC/ CrabHorizontal Test Area

RF- Power
2 Klystrons

D11 Kly. Gallery

RF- LL Cont.

D10 Kly. Gallery

Crab RF-driving System: Side View

RF- LL Cont.

Nikko
Exp. Hall

78 m

D11 Kly. Gallery

6m

SCC; D11
Crab: LER

SCC; D10Crab: HER

Transport Crabhere.
10 mHER
D10Photos taken by Professional Cameraman: 07/01/25: courtesy MHI

LER
D11

Photos taken by Professional Cameraman: 07/01/25: courtesy MHIHER; D10
Alignment

07/01/12
After Inst.

06/12/27
Before Inst.

1.0

07/01/08
Installed

1.00.1

Support leg;with Sliding pad

Upward(V)

Deviation:mm
Coupler(H)

1.7
0.5

0.0
1.0

Reference line

0.75

coupler

07/01/09
Before Inst.

07/01/15
After Inst.

LER; D11
Alignment

0.0
0.1

07/01/11
Installed

0.3
0.7

Reference line

coupler

Alignment at Installation:
Upward(V)

Deviation:mmCoupler(H)
0.3
0.2

0.55
0.0

Ref. line was defined by Qmagnets.
Rotation was checked by awater level (~100µrad).
[can’t measure opposite sidedeviation]

Crab Installation: How toNikkoExp. Hall

Crab ; LER; D11~60 m

Set Crab to Carrier

Crab ; HER; D10

Set Crab to Tirroller

Removed 8 shieldCrab Installation: D10

Crab ; HER; D10pillar
HER LER

LER
HER

InputCoupler

Narrow Passage
Crane : Low Lifting Height: Limited access
Install the Crab with using
the Tirroller. when theConcrete Shields areRemoved.
Installation Area is Near toNikko Exp. Hall

HER; D10Preparation

Only HER beampipe wasremoved.

Support legs: 4 for weight support/ 2 for flatness

HER; D10
Pulling

10:54; Lifting
11:08; Landing
11:20; Pulling
11:45; ReachCrab was put on wooden block tokeep higher level above support
leg. No crane available.

HER; D10
FinalDestination

11:49; to Lateral
12:14; Close to
12:22; Close up
to; ~3cm

Crab Installation: D11

Crab ; LER; D11
Narrow Passage
Low Crane Lifting Height---> Interfere with SCC
HER LERLERHERCan use neither the Crane
nor the Tirroller;---> Need Carrying Tool.
Installation Area is far awayfrom the Nikko Exp. Hall;~ 60 m.

Crane Rail

Crab Installation: Carrying Tool

The Carrier ; hanging to theexisting Crane Rail.
Moving along the rail andperpendicular to it.

Crab Installation: Carrying Tool

Move to the installation area, then hang down
; using chain block(pulley).
Setting the Crab to the carrier;
Carried out on the Concrete Shield.

Crab Installation: D11 Area
“AnimationShown Last Year!”Hours wasted because the strategy
changing to cap the carrying
frame.

LER; D11
Preparation

10:05; at tunnel
12:04; setting
14:22; hangforward
15:36; readyto moveBoth(LER/HER)
beam pipes
were removed.

LER; D11
AirTransport
15:37; take-off
15:38;
15:48;
15:52; arrive

During Transport, Crab was fixedby pulley and sling wires inorder to prevent swing motion.

LER; D11
Landing

15:52; arrive
16:06; releasewire
16:13; readyto down
16:27; down
by pulley
16:44;
17:11; Close tohead of support
17:18; Rough
Adjustment

Support legs

2nd target day; KEKB

1st target day; muststart; Feb/13

be completed; Jan/24

Start work;Dec/14(maintenance day)Works for Installation start; Dec/25
Stop KEKB; Dec/24

Schedule(past):revised
06/Dec/01

KEB commissioning
started asscheduled,
Even though;High Powerconditioning ofCrab (day time),
Beam commissioning(evening/night),
For ~1 week.

Schedule(future)

Scenario of Crab Detach
1) No detach if Crab works quite well; Ideal case.
2) Detach as scheduled; No beam commissioning expected.
1 month(crabbing tuning) + 1 month(high current),
then summer shut down.
3) Detach as soon as possible; Resume Beam commissioning.
~3 weeks shut down (warm up ~1 week, etc. ) ~50k$.
Vacuum scramble may be needed.

Rubber O-ring became hard.

Feb/10; During conditioning