“PROGRESS on CLIC FF (QD0) ” Michele Modena - CERN

“PROGRESS on CLIC FF (QD0) ”

Michele Modena - CERN

“CLIC Weekly Meeting” on 30 Oct 2009, M. Modena

• In a “CLIC-MDI” Meetings, on 27 Aug 2009, we presented a proposal for an hybrid design for the QD0 (the subject was also presented two weeks ago at the “CLIC09 Workshop” and majority of the slides presented here are adapted from August and October presentations).

• New developments of the last months are:

- Enlarging discussions with other actors and starting to take into account:– Detector design and interfaces– Anti-solenoid presence – Stabilization requirements

- Work on a more “adapted design” of the QD0, eventually with reduced or zero impact of the coils water cooling (for stabilization reasons)

- Contacts with potential Suppliers in order to build ASAP a 1st short prototype to prove and validate the hybrid QDO conceptual design.

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“CLIC Weekly M

eeting” on 30 Oct 2009, M

. Modena

“Nominal” Requirements for CLIC FF Quad (for L* = 3.5 m layout):

• Gradient: highest possible towards a nominal value of: 575 T/m )• Required Length: 2.73 m (… under discussion how to eventually split this

length in different “magnet slots” …)• Magnet Bore Radius: 3.8 mm + 0.3mm (as estimated with Vacuum Group for

a vacuum chamber thickness) + 0.025 of tolerance = 4.125mm• Field Quality: a 1st requirement exist, but to be further discussed with CLIC

Beam Physic Group

• Geometric (layout) boundary conditions:Major one is: presence of the “spent beam pipe”: conical shape (10 mrad aperture), min. distance from the FF (at the front end for a L* = 3.5 m): 35 mm

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Pure PM approach: “Halbach” vs. “Super Strong” performances:

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R=3.8 [mm] (no chamber)

R=4.125 [mm]

Material Sm2Co17 Nd2Fe14B Sm2Co17 Nd2Fe14BGrad [T/m] “Halbach” 450 593 409 540Grad [T/m] “Super Strong” 564 678 512 615

PM

Permendur

(Courtesy A. Vorozhtsov)

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“Pure Electro-Magnetic” approach:

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Yoke material-ST1010, Bs=2.1 [T]

Grad=310 T/m

Yoke material-Permendur, Bs=2.35 [T]

Grad=365 T/m

-“8 shape” quad design: (it permits to accommodate the spent beam pipe)

- Saturation appears (with both materials)

( NI= 5000 A )

(Opera 2D simulation. Courtesy A. Vorozhtsov)

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“Hybrid” approach, Version 1:

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Iw=5000 [A]

Grad [T/m] Sm2Co17 550

Grad [T/m] Nd2Fe14B 615-Presence of PM wedges reduce strongly saturation in the poles Gradient increase of a factor 1.5-1.68 (Opera 2D simulation. Courtesy A. Vorozhtsov)

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“Hybrid” approach, Version 2:

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Iw=5000 [A]

Grad [T/m] Sm2Co17 531

Grad [T/m] Nd2Fe14B 599

- The presence of the “ring” decrease slightly the Gradient (by 15-20 T/m) but will assure a more precise and stiff assembly

- EM Coils design will permit wide operation conditions (with or without water cooling) that can be critical for performances (ex. stabilization)

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“Hybrid” approach, Version 2: Field quality

Gradient azimuthal homogeneity at R=1mm

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Resuming :

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Hybrid magnet Iw=5000 A (Tunable) R=4.125 [mm]PM Material Sm2Co17 Nd2Fe14BYoke Material ST1010 and PermendurGrad [T/m] Version 1 550 615Grad [T/m] Version2 (SOLID CENTRAL RING) 531 599

For our application Sm2Co17 choice should be probably the preferable because:- High Curie temp. ( vacuum chamber baking-out should be not a problem up to 250 °C)- SmCo alloys are the most resistant to radiations (radiation dose estimation studies are now starting)- The material should not degrade and remain stable inside the magnetic field created by the EM coils (5-8 kOe); checks are ongoing with the PM possible Supplier.

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“Hybrid Short Prototype” (Version 2):

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Conductor ID (ex. from “LUVATA” Catalogue) 6822

height/width [mm] 15.4/10

hole diameter [mm] 4.0

x/y [mm] 5.70/3.00

R [mm] 1.50

N turns per pole 12

Conductor Length [m] per pole for 1m magnet 28.5

Minimal bending radius [mm] 20

Insulation thickness [mm] 0.5

Mass per m 1.25 kg/m

(Drawings: courtesy E. Solodko)

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“Hybrid Short Prototype”:

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“Hybrid Short Prototype Ver. 3”

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Dimensions increasedfrom 35mm to 52mm

“Hybrid Short Prototype Ver. 3”:

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Covers (for safety reasons: blocking the PM wedges)

…Towards a more “adapted” design (…still as CONCEPTUAL design!):

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1) Reduce the current density in the coil (and consequently the coil cross-section) to be free from cooling water (at least in turbulent regime). The proposed cross section must have J ≤ 1.5 A/mm2.

2) Anyway, the presence of a “cooling circuit” is expected for a “thermalization” more than for a real coil cooling. This will also depends by the design of the support beam.

3) The presence of some “thermalization plates” will also provide higher rigidity to the coil assembly (remind that the coils could be quite long in the final magnet(s) since 2.73 m of total length for the QD0 element(s) are required).

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… Towards a more “adapted” design (“Slim Version” conceptual design…)

Plates for eventual thermalization of the coil and for stiffening of the coil pancakes

coils supporting fully independent from iron supporting

Coil copper conductor (ex. 4x4mm). Nominal J= 1.5 A/mm2

QD0 Support Beam

(Drawings: courtesy E. Solodko)

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system

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… Towards a more “adapted” design (“Slim Version” conceptual design…)

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… Towards a more “adapted” design (“Square Version” conceptual design…)

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… Towards a more “adapted” design (“Square Version” conceptual design…) “CLIC W

eekly Meeting” on 30 O

ct 2009, M. M

odena

Support/stabilization system

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Thanks for your the attention!

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(extra slides)

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“Halbach type” approach:

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“Halbach type” approach: achievable gradients

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0 2.5 5 7.5 10 12.5 15 17.5 20 22.5 25 27.5 30 32.5 35 37.5 400

100

200

300

400

500

600

700

800

900

1000SmCo5, Br=0.865[T]Sm2Co17, Br=1.1[T]Nd2Fe14B, Br=1.4[T]

Grad(R_ini), Rfinal=35 [mm]

Rinitial [mm]

Gra

dien

t [T/

m]

4.125

0 5 10 15 20 25 30 35 40 45 50 55 60 65 700

50100150200250300350400450500550600650700

SmCo5, Br=0.865[T]Sm2Co17, Br=1.1[T]Nd2Fe14B, Br=1.4[T]

Grad(Rfinal), Rini=4.125 [mm]

Rfinal [mm]

Gra

dien

t [T/

m]

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Resuming :

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PM magnets (NOT Tunable) R=4.125 [mm]Material Sm2Co17 Nd2Fe14BGrad [T/m] “Halbach” 409 540Grad [T/m] “SuperStrong” 512 615

NC magnets Iw=5000 A (Tunable) R=4.125 [mm]Material ST1010 PermendurGrad [T/m] 310 366

Hybrid magnet Iw=5000 A (Tunable) R=4.125 [mm]PM Material Sm2Co17 Nd2Fe14BYoke Material ST1010 and PermendurGrad [T/m] Version 1 550 615Grad [T/m] Version2 (SOLID CENTRAL RING) 531 599

- For our application Sm2Co17 choice could be preferable (higher radiation resistance)

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As CERN “Magnet Group” we propose to go on ASAP with the construction of a 1st short prototype. We see several advantages in this.A FF quadrupole prototype (short model!) will be useful for :– for CLIC: To check the feasibility of a possible FF design approach.– for CERN: To let CERN-TE/MSC starting activities in PM magnet domain

and more specifically:• Validation of a possible FF cross-section design• To investigate the difficulties for the high precision machining of the

Permendur poles, the PM wedges, achievable tolerances, etc.• To investigates the role of tolerances between poles and PM wedges in terms

of Gradient and Field Quality• Eventually, to tests different PM materials

– for CERN/CLIC: Provide a magnet with a minimum bore aperture to develop and test miniaturized magnetic measurement systems.

– …

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“PROGRESS on CLIC FF (QD0) ” Michele Modena - CERN

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