RDR Linac Definition Tasked Cryomodule & Cryogenics Groups with

defining cryomodule length and cryoplant layout First pass generated at Jan 16-17 CERN meeting

Tasked RF Group to work with Civil Group to define the size/layout of support tunnel Have some preliminary sketches

Tasked Magnet group with specifying the linac quad and corrector package Reviewing issues, TDR design and CIEMAT

prototype Created stand-alone corrector designs

RDR Linac Definition (Cont)

Will task LET Group with resolving beam dynamics related issues at Feb 8-11 CERN meeting

Work with Instrumentation Group to define diagnostics List of instruments and issues generated at Jan

17 FNAL meeting Optics for special regions to be defined at SLAC Discussing implications of MPS and availability

requirements with Himel et al.

Slides from Talks by Don Mitchell, Tom Peterson and Others at Jan16-17

CERN Cryomodule Meeting

Don Mitchell, 16 JAN 2006

TTF III+ Cryomodule

Courtesy of DESY

ILC Cryo Design Considerations Move quad package to middle of cryomodule to

achieve better support and alignment. Shorten cavity-to-cavity interconnect and

simplify for ease of fabrication and cost reduction. Possible superconducting joint.

Overall improved packing factor. Simplify the assembly procedure. MLI redesign to reduce hands-on labor costs. More robust design to survive shipping. Reliability of tuner motors in cold operation. Etc. (we’ve heard many suggestions)

Increasediameter beyond X-FEL

Increasediameter beyond X-FEL

Review 2-phase pipe size and effect of slope

Assumes use ofXFEL Main Coupler

Graphics from Terry Garvey

Proposed Cavity w/ Bladetuner

Cavity Dimensions

Existing Desy Interconnect Design

Flange/Bellows Design Specs:• Bolted flange (12 bolts/flange)• Convoluted SS Bellows (10 waves, 54mm free length, ±25mm)

-Length of bellows dictated by bolt length, old elastic parameters• Bellows elastic requirements: ±4mm (~1mm thermal + ~3mm tuning)• Aluminum Alloy 5052-H32 Diamond Hex Seal• 7 Ton (~15,000 lbs) clamping force, 35 N-m torque/bolt• Mechanical analysis done @ Desy, INFN

(Cornelius Martens, Roberto Paulon)

344

Interconnect:Tesla TDR: 283mmCurrently 344mm

887

77 66 666 78

1222

335

BPM / Quad / Corrector Package

887

TDR

QUAD CorrectorsBPM ILC

Preliminary

BPM QUAD and

Correctors

Shell Type ILC Dipole Corrector

Magnet ParametersIntegrated field 0.02 T-m

Center field 0.2 T

Winding ampere-turns 18kA

Current 90 A

Superconductor NbTi

SC diameter 0.5 mm

Outer diameter 140 mm

Magnet length ~ 200 mm Flux density and flux lines at max current in both dipole coils

Field homogeneity at max current in both dipole coils (+/- 1% at R< 30mm)

Advantages:

Compact radial dimensions

Effective winding

Low fringing fields in radial directions

Disadvantages:

Long coil ends ~ 50 mm

Very short strait coil part

Long end fields +50mm/end

Complicated winding

Vladimir Kashikhin, Fermilab

Window-Frame Type ILC Dipole Corrector

Magnet ParametersIntegrated field 0.02 T-m

Center field 0.2 T

Winding ampere-turns 18 kA

Current 90 A

Superconductor NbTi

SC diameter 0.5 mm

Shield outer diameter 320 mm

Magnet length ~ 150 mm Flux density and flux lines at max current in both dipole coils

Field homogeneity at max current in both dipole coils (+/- 1% at R< 30mm)

Advantages:

Compact longitudinal dimensions

Simple coil and yoke manufacturing,

assembly

Short coil ends

Good integrated field quality

Good SC coil stability

Disadvantages:

Radial ferromagnetic shield

Thicker iron yoke

Vladimir Kashikhin, Fermilab

Alternate Quad Cryo-section

1530 mm

Pros and Cons to a separate quad/BPM cryostat

Pros Easier to accommodate different magnet packages, upgrades, etc. Easier to make independent adjustments to the quad/BPM position Allows for a common cryomodule design Allows independent cold testing and measurement of the magnet

package Schedule, resources, and fabrication facilities not tied to

mainstream cryomodule production Mechanically more stable especially with respect to vibration Precludes the need for independent quad movers inside the

cryomodule Cons

One extra interconnect required at each quad location Potentially requires more longitudinal space required in the lattice Interconnect forces due to bellows could affect quad alignment

Region between Cryomodules

Assume 850 mm Flange-to-Flange length (TTF) – Includes 270 mm Broadband HOM absorber Gate Valves Pompous Ports

Needs to be better defined

Excel usage integrates engineering calculations into the 3-D CAD process!

Automatically adjusts for thermal contraction and component lengths

Some critical open design issues Quad/corrector/BPM package is a major

unknown right now and goes into the heart of the module.

Tuner details, slow and fast, but especially fast tuner Cavity-to-cavity interconnect design. Vibrational analysis, which will be compared to

measurements for verification of the model for future design work.

Magnetic shield re-design. Development of module and module component tests. Verification of cavity positional stability with thermal

cycles. Design of test instrumentation for the module. Robustness for shipping, analysis of shipping restraints

and loads, shipping specifications. Active quad movers(?) A complication

ILC cryogenic system much larger than TESLA 500

8 cryogenic plant locations Approximately 5 km spacing Each location with 2 cryogenic plants of

about the maximum size -- each plant equivalent to about 24 kW at 4.5 K

Each plant about 6 MW “wall plug” power

ILC cryogenics about 50 MW total

Segmentation concept A box of slot length equal to one module Can pass through cryogens or act as “turnaround”

box from either side Does not pass through 2-phase flow, so must act as a

supply and/or end of a cryogenic string Includes vacuum break for insulating vacuum Includes fast-acting isolation valve for beam vac May contain bayonet/U-tube connections between

upstream and downstream for positive isolation May also want external transfer line for 4 K “standby”

operation (4 K only, no pumping line)