Main Ring Magnet system
Magnet design & measurements
Installa3on, survey & alignment
K. Egawa
M. Masuzawa
Y. Ohsawa

Superconduc3ng magnet
Design & measurements
N. OhuchiPower supply design, tuning
Installa3on & Cabling
T. Kawamoto
T. Sueno
N. Tokuda

Yesterday’spresenta3on

Ring Magnets
Magnet design & measurements
Installa3on, survey & alignment
K. Egawa
M. Masuzawa
Y. OhsawaImpact of Nano‐Beam Scheme• Main dipole magnets need to be replaced for both HER andLER rings.
– LER dipoles become longer (Leﬀ 0.89 m ⇒3.99 m)– HER dipoles become shorter (Leﬀ 5.91 m ⇒3.8 m)• More wiggler magnets with shorter pole length (half pole)needed.
• More dipole, quadrupole and sextupole magnets are neededin HER since number of cells increased (~30 % more magnets).
• Cooling water system needs to be strengthened because thewe will have ~30 % more magnets while we are opera3ng thecooling water system with almost 100% capacity level already.
• Most of the magnets except for the quadrupole magnets inthe two straight sec3ons (Oho & Nikko) will be relocated tonew posi3ons. ⇒Realignment is necessary.

New magnets& magnets need to be re‐measured
Water cooled
Tolerances of the main ﬁeld & mul3pole ﬁeld errors
are the same as KEKB,
is our current understanding.

Main magnets to be designed, manufactured & measured
for SuperKEKB LER
Calculated for 4GeV
MagnettypeArc
dipoleWiggler
WigglerMag.
name
B2P.*

Eﬀ. Length B or B’
counts Comparison[m][T],[T/m]with KEKB
3.99
0.1876
104
Longerweaker
BW0*.P 0.213
0.699
112
Half pole
BW1*.P 0.346
0.69956
Single poleSkew
Quads
Quads
Tsukubasec3on

QK*LP

0.314

2.28

8

QB3LP 0.56
QB3RP(largerbore)

9.28
8.42

11Longer
3 × Stronger
Same shape*~50% stronger*We have 43 magnets of this type but will need 44 for SuperKEKB.

Main magnets to be designed, manufactured & measured
for SuperKEKB LER
Magnet Mag.
typename
Arc SxEﬀ. Length B’’[m][T/m2]
0.344
So farMax.
SF2TLP
600
etc.,

348[T/m2]

counts# of mag>348
depends
on op3cs
104 if all

Comparison
with KEKB
B”=348[T/m2]

LER arc sextupoles are already saturated
at current max. of 425 A.
It seems hard to incread B” by raising the current.
Need to make new sextupole magnets.

Excitation curve

How many?
All (104) ?
Or just the ones which exceeds 348 [T/m2]
with the most recent LER op3cs?

Main magnets to be designed, manufactured & measured
for SuperKEKB HER (calculated for 8GeV)
MagnettypeMag.
nameEﬀ. Length[m]

B or B’[T],[T/m]

countsComments
Comparison withKEKB

Arc
dipole,etc.,

B2E.*,etc.,

3.80.3125

144

Shorter~20% stronger

DipoleTsukuba

BL*LE

4.00.2802

14

Why not 3.8 m?

0.373

3.238

11?

3 × Stronger

1.015

8.580(193)

TRISTAN QB
We have 113 S3ll
need 80.

0.826

8.5(@500A)⇒~1310

TRISTAN QA*Need to run at
I > 500 A

Skew Quads
Arc quads

Straight
Sec3onquads

QK*LE
QF2E.*,etc.,
QS5TLE,etc.,

Main magnets to be designed, manufactured & measured
for SuperKEKB HER
Magnettype
Straight
Sec3onquads

Mag. Eﬀ. Length B’ or B’’,name [m][T/m] or[T/m2]QL8LE 0.56
12.7etc.,(@500A)⇒15
QL9RE 1.12
16.6
etc.,
QA1LE 1.015
8.5etc.,(@500A)⇒8.7

counts CommentsComparisonwith KEKB
7
*Need to run at
I > 500A
2

Newly made14

TRISTAN QB*Need to run at
I > 500 A*Even if we are recycling the magnets, the ﬁeld measurements need to be done
again with larger maximum current in order to obtain an excita3on curve.
And we will need new power supplies.
TRISTAN QA/QB can reach 20 T/m @1350A

Main magnets to be designed, manufactured & measured
for SuperKEKB HER
MagnettypeArc Sx
Tsukuba
Sx
Tsukuba
Sx

Mag.
name

Eﬀ. Length B’’counts Comments[m][T/m2]
Comparison
with KEKB
1.0
348
88
We have 48.
SF/D.*
(136)
836
4
Super
SLYTLE.* 0.3

SLXTLE.* 0.4

7454

Super

Superconduc3ng magnets at the Tsukuba straight sec3on??
We will wait for the latce to be ﬁnalized.

New magnets& magnets that need to be
re‐measured
Air cooled
Corrector magnets

Corrector magnets to be designed, manufactured & measured
or to be modiﬁed for SuperKEKB
MagnettypeMag.
name

Eﬀ. length B・Leﬀ[m][T・m]countsLER
Ver3calfor arc sec.

ZV*P

0.344+α0.012?

Only for Wider gap for
QD
antechamber~230?
160 ⇒ 290 mm

LER
Horizontal
for arc sec.

ZH*P

0.344

0.02

OnlyFor QF
~230?

HER
Ver3calfor arc sec.

ZV*E

0.344+α0.02?

Only for Wider gap for
QD
antechamber~290?
160 ⇒ 240 (?) mm

HER
Horizontal
for arc sec.

ZH*E

0.344

0.03

Only
For QF~290?

Power supplies for corrector magnets will be reused.
Max. kick will be 0.012/0.02×3.5/4 (~0.5) for ZV*P.
Max.kick will be 3.5/4 for ZH*P.

Comments

Rotate LER ZV*Pby 90°
new supports

Rotate HER ZV*Pby 90°
new supports>500 new cor. magnets>500 new supports

Magne3c ﬁeld measurements•All new magnets•Recycled magnets operated at higher
current (than the present max. current)Magne3c ﬁeld measurements
New magnets need to be measured.
Recycled magnets with higher opera3ng currents than the presentmax. current need to be re‐measured with a proper
standardiza3on payern.
Magnets to be measured:~360 main dipoles ⇒ new ﬂip coil system~170 wigglers ⇒ﬂip coil (for KEKB LER dipole)~150 quads (probably more)⇒ harmonic coil*~90 sextupoles (1.0m) (or more) ⇒ harmonic coil*~104 LER sextupoles (0.34m) if newly made.⇒harmonic coil*~600 correctors (may be more?)⇒ may have to ask themanufacturer to measure these.

Magne3c ﬁeld measurements
We need:•A new system for ~ 4 m dipoles•New harmonic coils (or overhaul)•Dedicated measurement area (Nikko B4)•A measurement team, equivalent to what we had for KEKB.
Mass measurements started in Nov.1996 and lasted for about
18 months, followed by some other special measurements.
Egawa-san memo, April 1998
通称 日光軍団 :Team Nikko
・メンバー紹介:Members
三菱電機：松崎 正実
M.Matsuzaki
ATC： 金澤Y.Kanazawa
クリハラント：松崎 義久、生村、水野、村上（クレーン）
Y.Matsuzaki, Ikumura,Mizuno,Murakami
三菱電機システムサービス：鈴木田 (高橋)Suzukida (Takahashi)~7 people from companies + K.Egawa & M.Masuzawa (KEK)

followed by some other special measurements.

•Magne3c ﬁeld measurements: KEKB construc3on
We will be measuring relatively large magnets (1~7 tons).
A couple of people adjust the magnet position to the measurement
system, while others are checking the alignment.

HERLER

Both HER/LER
harmonic coils needan overhaul(or to be madenewly).

Total # of main magnets to be measured (N) at KEK is 500 < N < 1000,
If ~600 corrector magnets are measured outside of KEK.

A new ﬂip‐ﬂop coil system is necessary
to measure a ~4 m dipole magnets.

Cooling water system

Cooling water capacity
System we have now for KEKBThe TRISTAN pump system was reused for KEKB,
while the # of magnets doubled.
There are ~1600 water cooled magnets in KEKB.
A delicate balance of the ﬂow rate among those
hundreds of magnets needs to be made and maintained.
 Very suscep3ble to any turbulence.
A signiﬁcant amount of eﬀort has been made toachieve stable opera3on.
⇒ We need more water for SuperKEKB.

4 pump systems
Each~3600 l/min.
Operated at ~100%
Capacity level.
8 pump systems,
Capacity will bedoubled.
Plumbing workoutside/inside
the tunnel
is needed.
⇒will be taken care of by
the Facili3es Department.
Connec3on to the magnets
will have to done by us.

Magnet cooling water system

Power supplies
Power supply design, tuning
Installa3on & Cabling
T. Kawamoto
T. Sueno
N. Tokuda

Impact of Nano‐Beam Scheme• More power supplies are needed as # of magnet families
increases.
– More space in the power supply buildings.
– More cables from the buildings to the tunnel.

• New power supplies are needed to run at higher currents
and/or with diﬀerent speciﬁca3ons.
– Deﬁnitely the IR magnets.
– Power supply design will have to wait for the magnet design, which will start a}er themachine latce is ﬁnalized.

• Some very old power supplies need to be replaced.
– Most likely the power supplies for the LER/HER dipole magnets will bereplaced. Wigglers?

• Cabling in the tunnel needs to be (mostly) removed & re‐done– Remove completely or par3ally?
– Magne3c cancella3on due to the cables in the tunnel needs to be re‐considered.

Power supply system

Thru holes
between the bldgs& the tunnel large
Enough?
•8 power supply buildings•There are more than 2200 (~1800 for smallmagnets power supplies for KEKB.
•The PS buildings are already very crowded.
•We requested addi3onal space & powerreceiving and distribu3on facili3es.

More cableracks needed.

The cables which we want to replace are some3mes at the boyom of everything else.
Not realis3c to ID each cable and pull the cable that you want out from the rack in thetunnel.
How much of the cable we can recycle is not clear, though it aﬀects the cost & 3me
es3mates.

Power supply system
Technical issues that we foresee:(though the speciﬁca3ons have not been ﬁnalized)
More precise setng/monitoring of the current⇒by increasing the DA/AD bits from 16 to 20(?)
StabilityLong term stability improvement
Ripple reduc3on
The KEKB power supplies
peak‐to‐peak ~10 ppm
year‐to‐year 10~20 ppm , preyy good actually.
But whether we can achieve this performance with new power supplies isanother issue.
Control system
Network (arcnet⇒ ?)Programmable Logic Controllers (PLC) interlock system upgrade.

Magnet installa3on & alignment
Probably more complicated opera3on than before (KEKB)
as we will not start from scratch(an empty tunnel).
Pros: Save on construc3on $$ & 3me of the tunnel.
Cons: Removal of the components (magnets, cables,vacuum pipes, etc) & ﬁxing the ﬂoor surface, extra
work have to take place ﬁrst.

Magnet Installa3on
HER⇒ Latce changes to more crowded one.
Most of the exis3ng magnets & new magnets will be relocated to
new posi3ons, except for the quadrupole magnets in the twostraight sec3ons (Oho & Nikko) .
⇒Removal/re‐installa3on & alignment is necessary
LER⇒ Dipole magnets replaced by longer ones.
⇒ Remove the old wigglers in the two straight sec3ons(Oho & Nikko), install old & new wigglers.
The arc latce is the same but … with the new IR latce, LER
circumference needs to be adjusted (to that of HER & present KEKB)
by the arc sec3ons.
⇒ We have to move the magnets in the arc sec3on.

LER arc sec3on magnets need to be movedoutwards
For larger circumference �
Shorter cell & �
longer straight section.

Present LER

For smaller circumference �Longer cell & �Shorter straight section.

Magnets in the arc sec3ons
will have to move towardout side, as much as 30 mm.

Can we shi} the quadrupole magnets by ~30 mm
without removing them from the base plates?
No.
Horizontal adjustments are made here but
Only up to < 20 mm (most cases 10 mm).
So we will have to remove the magnets
from the (orange colored) base plates.
It is possible to make new holes aroundhere if the shi} is really only in the radial
direc3on.
These may sound minor but a small addi3onal
work will eﬀect the en3re construc3on scenario& schedule.

Magnet removal (from the tunnel)

North tunnelWesttunnel

Easttunnel•All of the HER arc magnets (B/Q/Sx/StV/StH) &base plates have to be removed form the beamline.
•Can LER quadrupole remain in the beam line?
May be, in the West & South tunnels as LER isouter side.
•Can we remove the HER magnets in the East &South tunnels without removing the LER Q?

South tunnel
How many of the LER Q magnets can bele} in the beam line?
⇒aﬀects the construc3on procedure,schedule, 3me and cost.

East tunnel

★ NoteMagnets can be removed only a}er thevacuum pipes are removed.
And to remove the vacuum pipes fromThe magnet, the magnet has “open”.
(1)Magnet top is removed.

We have to this open‐close opera3onfor all HER/LER Q/Sx magnets.

(2)Wait for the vacuum pipe
to be removed.

(3)Magnet top is put back and bolted again
So that the en3re magnet can be li}ed.

Magnet removal

Magnet lifted up
Photos are from theKEKB construc3on days,shown reversely.

Magnet on the air pallet

Move it up to 1st floor of theaccess shaft by crane (one byone) to a storage area (where?)

Magnet taken away from the beam line
to an access shaft.
(There are 4 access shafts in the tunnel)

Air pallet trolleybeing overhauled.

Part of the tunnel ﬂoor
needs repair/repaint.

Magnet installa3on & alignmentArc section

Removing the old (orange)
base plates, repairing the floor,surveying, marking the new beam line& installation of the new base plates.

Straight sec3ons (Oho & Nikko)
New wigglers (112 + 56) need to be installed & aligned (!)
in the straight sec3ons while RF cavi3es remain…

How?

Alignment
KEKB (TRISTAN) monumentsrather sparsely located (every ~8‐10 m)
Overlap is small.

In order to enforce the tracker networking,we are adding more monuments tothe wall and etc., and surveying
them. We hope to obtain a stronger
tracker network for SuperKEKB.
New tracker performance test, also.

Floor mo3on monitor system
We will install HLS sensors in the KEKB
tunnel (IR) in order to monitor a levelchange over 3me.
We obtained 5 HLS sensors from SLAC
(thanks to R.Ruland, G.Gassner &A.Seryi) and installed them in theATF2 beam line.

R.Sugahara

5 µm ﬂoor 3lt is measured.
Impressive.

Construc3on
Remove the top part of themagnets,
Removal of vacuum pipes
Put the top part backRemoval of power
cables, cooling pipes,,,

Floor repain3ng for air
pallet trolley
Magnet removal

Monument survey

Floor repair

Removal of baseplates

Drawing of the newbeamline on the ﬂoor

New base plates

Magnet installa3on

Magnet survey in theen3re ring

Magnet alignment

Vacuum chamber installa3on

Magnet produc3on& meas. must bedone

Summary
Magnet design &measurements Installa3on,survey & alignment
K. Egawa
M. Masuzawa
Y. Ohsawa
Power supply design, tuning
Installa3on & Cabling
T. Kawamoto
T. Sueno
N. Tokuda•The switch to the nano‐beam scheme
created a huge impact on the amount ofwork.
•We wait for the latce to be ﬁnalized
so that we can start working on making
a construc3on schedule.
•More complicated scheduling andarrangements seem to be required
among groups.
Will magnet produc3on, measurements, power supplies,
cabling, installa3on, alignment, etc., all be completed in 3me?
Help, I need somebody
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