Main Ring Magnet System
Magnet design & measurements
Installa1on, survey & alignment
M. Masuzawa
K. Egawa
Y. Ohsawa
H.Iinuma (new! Rela%vely young!!)
Power supply design, tuning
Installa1on & Cabling
N. Tokuda
T. OkiT. Kawamoto
T. Sueno

2012/2/20

Superconduc1ng magnet
Design & measurements
N. Ohuchi
M. Iwasaki
H. Yamaoka
Z. Zong
Re1red but s1ll ac1ve,
no 1me to rest
R. Sugahara
K. Tsuchiya

1

Contents
I.

AJer the earth quake– Tunnel Damage• Visible mostly at the expansion joints• Survey tunnel from inside and outside– Damaged magnets in the storage area

II. Current status– Magnet installaUon– Field measurement– R&Ds• RotaUon mechanism of the sextupole magnets• AddiUonal windings of the correcUon coils of the sextupole magnets

III. AcUviUes for the ﬁscal year 20122012/2/20

2

I. AJer the earth quakeA) Damages
Horizontal• Tunnel: VisibleVerUcal
mostly at theexpansion joints• Storage area: most magnets
are supposed to be re‐usedB) AcUviUes for recovery• Survey tunnel from inside andTsukuba Δ0.51m
Tsukuba Δ ‐0.1moutside

Data from GeospaUal
InformaUon Authorityof Japan (GSI)

Compared to Shimane(1000km away)

2012/2/20

Compared to Shimane(1000km away)

3Few mmdisplacement

cracks8mm

Magnet posiUon shiJsin the horizontal direcUon
Comparison between
Nov. 2010 and May 2011.

2012/2/20

Just above outsideliquefacUon
Uneven ﬂoor
4phenomena

Survey tunnel from inside and outside (1)[mm]Magnet posiUon shiJs in the horizontal
direcUon.
Comparison between Feb.2010 and June 2011.
YArrows not to scale
Max. deviaUon is about 3 mm inboth X & Y direcUons.

Oho exp. hall

The south arc
secUonX

Fuji exp. hall

Direc1on changes
at the expansion joints
indicated by red arrows.

Another full‐survey will start within few months.

2012/2/20

5[mm]Survey tunnel from inside and outside (2)Measure cracks on
the ﬂoor at BELLE

Depth: 30cm~80cm, >1.2m
Not yet ﬁxed!!

Monitor GAP distance at
2012/2/20joints
expansion

Measure cracks
depth on the wall.

Quick
circumferenUal lengthmeasurement

Measure Level by HydrostaUc
6water Level System (HLS)Survey tunnel from inside and outside (3)Deforma1on meas. by
Global Posi1oning System

Soil surveying
S7

•

S6

S8

B2S5

•
•

Five GPS antennas are mounted
on the KEKB buildings, which
can access to the tunnel
One GPS antenna is mounted on bldg.#3
GPS network is uUlized for tunnel network!

boring
Method for Swedish

S9weight sounding test
S4
S10

Direct views

Trying

S3

B1

S11

S2

S1

work in progressFeb. 13‐ Mar. 30

2012/2/20

Now installing!

7

Some magnets were damaged in the storage area
All of the KEKB Wigglers are needed at SuperKEKB
About 10 KEKB LER dipole magnets are needed at SuperKEKB~10 needed

All needed

2012/2/20

Before the earthquake8

Damaged in the storage area

 Wiggler Magnets:• All of the wiggler magnets were checked by ﬁeld
measurements and conﬁrmed to be OK. See next page
 Dipole Magnets:• Many of them are damaged and unusable.
• There are probably 10~15 healthy magnets, though theyneed to be checked by ﬁeld measurements this year.

2012/2/20

AJer the earthquake

9

KEKB wiggler : re‐measurement
The KEKB wigglers were re‐measured.
Two reasons are ;• The KEKB wigglers will be re‐used in SuperKEKB.
The maximum currents will be increased from
950 A ( Imax_KEKB ) to 1400 A.
• The KEKB wigglers were taken out from thetunnel and were in storage. They collided witheach other due to the big earthquake (Mar.
11‐th 2011).
A rota%ng coil ( long, right and le7 coils ) was usedfor the measurement.
 These 3 probes of the rota%ng coil had been wellcalibrated during the last measurement.

(B)

•
•

(A)

Measure absolute values of area (A) and (B)Measure residual ﬁeld : (A)+(B)long coil
2012/2/20

leJ coilright coil10

Results: All KEKB‐wigglers are OK.
ExcitaUon check: (A), (B)Residual ﬁeld check: (A)+(B)projecUon(B)(A)

2012/2/20

11

II. Current status(1)Showing 4 completed
items in the tunnel

3. In all secUons:A) KEKB LER dipoles anddipole correctors
removed from thetunnel.
B) SuperKEKB LER dipole
posiUons surveyed andmarked on the ﬂoorand base plates
installed.
4. InstallaUon of the 1st
SuperKEKB magnet (LERdipole) in the tunnel.
2012/2/20

1. Magnets, cables
and etc removed.

2. KEKB wigglers &cables removed.

121. Tsukuba straight sec1ons (L/R sides of the IP)

R‐side2012/2/20

R‐sideR‐sideL‐side13

3. A) Survey for the new (longer) LER dipole
magnets with laser tracker
LER inner ring

LER outer ring
HER long dipole
in the way.

2012/2/20

3.B) Base plates (3/dople) installaUon
in progress.
LER inner ring

LER outer ring14

4. InstallaUon of the 1st SuperKEKB magnet(LER dipole) in the tunnel.
String,moveand set !
Access roadGo over the magnet!
2012/2/20

Over the HER dipole
Tight clearance (~6mm)15

Done!
Feb.7th 2012

1st installaUon of the SuperKEKB magnet on Feb.7th 2012.
The main purpose of this installaUon was to debug the tools and methods for installingthe 4 m dipole over the 6 m dipole.
We installed 2 dipole magnets. The rest of the LER dipoles are scheduled to be
2012/2/20
16
installed this year.

II. Current status (2)SuperKEKB_LER_Barc : measurement status

skbLB_new

skbLB_new• 111 / 142 dipoles have been delivered.
• 95 dipoles have been measured by a long ﬂip coil system.
2012/2/20
17• 79 dipoles are in storage.

Excita<on checkassuming the energy ra%o ELER/EHER = 4/7I [A]

Bcenter
NMR [T]730

0.1660075

0.9953760

0.1728672

0.9955800

0.1819504

0.9954840

0.1910295

Poisson0.19035

BNMR/Bμ=0.9953860

cf. : Due to constraints of LINAC, the injec%on and QCS system,
ELER_max = 4.28571 GeV, EHER_max = 8.75875 GeV
2012/2/20 k = 0.0561 & E = 4.28571 GeV
18
BL = 0.802 Tm

bL[x] measured by long ﬂip coilmeasure 4 <mes at each point.
Their varia<on (example) is ;average5024673.5

σ285.697

σ /average

5.7e‐05

Scan every 50mm step

2012/2/20

Measure 0A, 500A, 700A, 800A as 19well.

each measured / reference (#1) @ 860A
reference variaUon @ 860A :st.[ t ] / st.[ t0 ]No. of95
mag.
average 1.0002958
standard
0.000205
deviation

No. of mag.
95
average1.000114
standard
0.000132
deviation

2012/2/20

20

R&Ds
1. RotaUon mechanism of
the sextupole magnets

2. AddiUonal windings of thecorrecUon coils of the ALL
sextupole magnets (~100/ring)

Mechanical rotaUon :‐30<Δθ<30 degrees (over spec?) •• 24 sextupole magnets neededfor LER (+ needed for HER?)•Δθ = 0 degree

2012/2/20

Needs to establish faster way
to wind coils
Work is needed to
be done IN thetunnel!
(photo from KEKB.
20 turns/pole witha single wire )Δθ = 15 degree21RotaUon mechanism of the sextupole magnets

Gear teeth

KEKB Sextupole(L=300 mm,~700kg)
as a test load.
2012/2/20

Worm gear

22

AddiUonal windings of the correcUon coils
3 mm2

AWG 12

2.2 mm2
AWG 14

 We will try to wind an addiUonal ~50
turns/pole eﬃciently on the poles of themagnets in the beam line.
Use of ﬂat cables is being invesUgated.
Temperature rise for mulU layer cases.
2012/2/20

23

AcUviUes for the ﬁscal year 2012
I.

In the tunnel: many and many!

Field measurement planII.

Field measurement

LER new dipole : ongoing
new wigglers : from spring 2012
LER_Q ( Leﬀ =0.5837 ) : from spring 20122012/2/20
HER_Qx: from spring 2012

III. GPS network

etc….
.

24

In the tunnel

Both ends of IR✔Magnets, cables,,,scheduled to be removed.

In all secUons:✔LER dipoles (100),
Totally new beam lines
LER verUcal dipole
Two important keys :correctors(~220),
wigglers (280)• Careful scheduling with a work ofLER
thescheduled
bevacuum/magnet cooling water system
bytotheinstalled this year.

Plant and✔TwoFacili1es
Department,
quads/tunnel
will be installed.
• Control tunnel
temperature at
SuperKEKB✔36KEKB wigglers
be installed
opera1ng value for precisionscheduled
surveytoandin HER next month.
alignment!
2012/2/20✔7 quadrupole magnets
replaced by shorter ones
25
this year.

Thanks

2012/2/20

26

New magnets ( normal ) production status2012.2.15

LER magnet

numberspeciﬁca1on

status

Dipole B_arc, B_lc

114 (+2) + 24 (+2)

ﬁxed

being delivered

Wiggler :half / single pole

112 (+2) / 56 (+2)

ﬁxed

will be delivered inMar. 2012

Short dipole2

not yet2012

Q ( Leﬀ =0.5837 )20≈ kb_Q.rf

will be delivered inMar. 2012

QK ( skew Q )10not yet2012

SL + skew Sx( rotatable)

8 + 24

not yet2012

VerUcal Corrector~ 220ﬁxed

will be delivered

2012/2/20

27

New magnets ( normal ) produc<on statuscont.

2012.2.15

HER magnet

numberspeciﬁca1on

status

Dipole (4 m) ⊂ LER dipole

13= LER B_lc

being delivered

BC* Leﬀ = 0.3444

8

not yet2012

addi%onal kb wiggler+ 22ﬁxed?

Q ( 0.56 m )38 (+ 1)

≈ kb_Q.arc

Contract process has
started.

Q ( 1.12 m )2 (+ 1)Qx

8 (+ 1)≈ KB_QX

delivered

QK ( Leﬀ =0.3444/0.3723 )6+2

not yet2012

SL + skew Sx (rotatable)

8 + 24

not yet2012

2012/2/20

Contract process hasstarted.

28

10 turns (x 10 A) = 100 AT are wound with the main coil.
These will be used to generate normal quadrupole ﬁeld for beam‐based alignment.
A request was made by the opUcs group to prepare addiUonal windings to generateskew quadrupole ﬁeld.
Power supplies will be newly made for the addiUonal coils.
SpeciﬁcaUons have not been ﬁxed yet. We will try to wind an addiUonal ~50 turns/pole eﬃciently on the poles of the magnets in the beam line.
Use of ﬂat cables is being invesUgated.
2012/2/2029

Δθ = 0 degreeΔθ = 15 degree

Gear teeth

RotaUon by steeping motor
3 degrees/0.36 million pulses & 3 degree/gear tooth• Takes ~4 minutes to rotate 15 degree• Very smooth rotaUon up to ±10 degree• becomes heavier beyond ±10 degree• RotaUon up to ±30 degree achieved
Reproducibility, coupling to the horizontal/verUcal
moUon, stability etc, need to be checked (and probably
need to be improved).
Handling of the power cables and cooling water pipes
2012/2/20
needto be examined.

Δθ = ‐15 degree
KEKB Sextupole (L=300 mm,~700kg) as a test load.30

bL[x] measured by long ﬂip coilmeasure 4 <mes at each point.
Their varia<on (example) is ;average5024673.5

σ285.697

σ /average

5.7e‐05

2012/2/20

31

2012/2/20

32

We made 8 pass‐through holes on each top of building along KEKB ring
Bldg.#3
GPSAntenna

6CXY‐stage
Look up view from accessroad to the tunnel@6C

Look down view fromthe scope
2012/2/20

33

✔Magnets, cables,,,scheduled to beremoved.

✔Magnets, cables andetc removed.

Totally new beam lines✔KEKB wigglers &cables removed.

✔Two quads/tunnel
will be installed.

✔ done✔ to2012/2/20
be done soon/this year

In all secUons:✔KEKB LER dipoles and dipole
correctors
removed from the tunnel.
✔SuperKEKB LER dipole
posiUons surveyed and marked
on the ﬂoor and base plates
installed.
✔LER dipoles (100),
LER verUcal dipole
correctors(~220),
LER wigglers (280)scheduled to be installed thisyear.

✔36 KEKB wigglers scheduled
to be installed in HER
next month.
✔7 quadrupole magnets
replaced by shorter ones this year.
34