WORKING GROUP 3 - SLAC National Accelerator Laboratory · PDF fileJ. Ritin, “Mechanical Design Review ... “Report on DDS3 Cell Machining ... LINAC WORKING GROUP SUMMARY TALKS (5

:

WORKING GROUP 3

MAIN LINAC

H. Mizuno and C. Adolphsen, Chairmen

Presentations

J. Wang, T. Higo, “Structure Development”

N. Hitomi, J. Rifkin, “Structure Manufacturing”

S. Tantawi, “DLDS RF Components”

C. Adolphsen, “Supports / Alignment / Operation”

-.Parallel Session

Review of Structure R&D

T. Higo, “Status of KEK Structure Development”

J. Wang, “Status of SLAC Structure Development”

Ongoing Collaboration Issues

DDS3 Assembly

J. Ritin, “Mechanical Design Review”

Y. Funahashi, “Bonding Procedure Review”

Discussion of Outstanding Issues

DDSS

Z. Li, “Design Optimization”

V. Srinivas, “Cell Calculation”

R. Jones, “Internal HOM Load Design and DDS Wakes”

Discussion of Design Status

I -

M2 High Power Test

Discussion of Preparation Work and Schedule

Future R&D

G. Bowden, “Research on Internal Fundamental Loads”

Discussion of Future Collaboration Efforts

-.

Structure Supports

G. Bowden, “Design Work at SLAC”

C. Adolphsen, “Structure Alignment Requirements”

C. Adolphsen, “Stability Tests at SLAC”

T. Suzuki, “Study of Alignment at KEK”

Discussion of Future Plans

Fabrication Studies

N. Hitomi, “Report on MD1 Bonding”

M. Yamamoto, “Report on MD1 Bonding”

H. Tsuchiya, “MD1 Straightness Measurements”

Discussion of Bonding Tests and Future Plans

Discussion with the Parameters Group

High Volume Manufacturing Issues

J. Klingmann, “Report on DDS3 Cell Machining”

J. Klingmann, “Ideas on Net Shaping, Stacking and Brazing”

N. Hitomi, “Structure Engineering Studies at KEK”

Discussion of Cell Tolerances, Production, Machining, Bonding etc.

Discussion with the Parameters Group

High Volume Manufacturing Issues

J. Klingmann, “Report on DDS3 Cell Machining”

J. Klingmann, “Ideas on Net Shaping, Stacking and Brazing”

N. Hitomi, “Structure Engineering Studies at KEK”

Discussion of Cell Tolerances, Production, Machining, Bonding etc.

Multi-Mode DLDS Design Review

S. Tantawi, “Overview”

Z. Li, “Design of Launcher”

N. Kroll, “Design of Bends”

Discussion of Future Modeling Work

Single-Mode DLDS

M. Neubauer, “Layout “

C. Adolphsen, “Operational Issues”

Discussion of Low Power Tests at BINP and KEK

Discussion of High Power Tests with the NLCTA

-

LINAC WORKING GROUP SUMMARY TALKS

(5 - 10 Minutes Each)

Structure Development - J. Wang / T. Higo

Structure Manufacturing - N. Hitorni / J. Rifkin

DLDS RF Components - S. Tantawi

Supports / Alignment / Operation - C. Adolphsen

-.

:

FIRST LC ISG WORKSHOP

SLAC

January 26-29, 1998

Summary Talk

WG 3: J. Wang

SUMMARYfor

Discussion on Accelerator Structure R&DJuwen Wang

l/29/98

.- We have been working very closely inaccelerator structure R&D for many years,

now we are getting even closer!

1 e Choice of Structure Type: RDDS Type

2. Section Length: L $2m

3. a/k Optimization

4. Ongoing Collaboration in Accelerator Sections:

i) DDS3 - Accelerator physics issues: kdn/df GaussianBetter HOM matching

- ASSET test and NLCTA project installation- Fabrication studies for LLNL- Full section bonding for lsf 60cm dia., 2m long section

by KEIUIHI based on their excellent skill and experiencesDetailed plan has been discussed:

DDS3D (dummy section) bonding practiceCell mechanical/microwave QCCell cleaning, packing, storage and shippingCell stacking and alignment checkDiffusion bonding

-.

Alignment, vacuum checkSection shippingFinal assemblyFinal Tests

ii) DDSS (first RDDS type section)- Design issues: Optimization

Cell dimension calculationWakefield calculationMeasurement and analysis for test stacksCompact couplers with symmetric/low fieldInternal HOM loadsFeasibility studies for internal fo loadParallel effort at KEK on open mode analysis

and coupler design- Cell design and fabrication issues -- VERY CHLLANGING!

KEK produced four #2 cells , microwave andmechanical QC results reviewed

190 test cell fabrication for DDSS20 special cells for DDSS1000 cells for machining and bonding studies

LLNL and SBRIIHI machining, comparison on MCC exam

iii) High Power Tests:- M2 high power test in ASTA- DDSl high power test in NLCTA- II-II high power in KEK

5. Other Important Issues, which are related bothaccelerator physics and engineering aspects, need to bestudied jointly by all collaborating institutions.

0 Tolerances (Machine Performance and Cost)

-.

- Theoretical model and mathematical treatment based onmachine physics

- Characterization for different machines and dimensions oftheir mass produced parts

- Cell QC and grouping

ii) Bonding tests (Reliability / Frequency Change)

- KEK’s experiences and data- Short stack tests on various temperature profile and pressure- Measurements for long sections

Only when we full understand the problem, then the finaldimension table for mass production can be decided.

iii) Surface cleanness and dark currentsimulation/analysis

I-

FIRST LC ISG WORKSHOP

SLAC

January 26-29, 1998

Summary Talk

WG 3: T. Higo

-

--_e--- - --

DOSS 9pe 97 ?

T. Higo ISG Jan. 1998

Bonding and alignment

Recent stud.ies

f0 -- 80mm diam, 1.3 - 1.8m long )

Based on ultra-high precison machining

Manual stacking against V-block

Align c 5km w.r.t. V-block

With/without pre-bonding

Vertical hanging

diffusion bonding at > 850°C

- 20 pm gentle bow

- 5 IJ-m with pressing to V-block

VAC tight with He leak check

FIRST LC ISG WORKSHOP

SLAC

January 26-29, 1998

Summary Talk

-. WG 3: N. Hitomi

Detailed plans for budget request of 1998

T. Higo 980 106, 980 122(rem. budget req.)

DDS3D

precise alignment / bonding study for DDS3finishing by the end of Feb. ‘98

R-DDS cell fabrication

2 tech. + 0.5 eng.clean rown maintenancerough machiningjigRF checking tool

tat-setestablish the base for the R-DDS fabrication

based on SLAC designregular, coupler, vacuum, horn port etc.

semi-mass production for DDS series

-. machining of ca. 1000 cellsfor machining study, bonding test use, etc.

mechanical checking of cellsevaluation of machning methodroutine check

RF checking of cells ---> manual checking stand

DDS5

1 tech. + 0.5 act.material 6m-longrough / medium machiningplunger / bead-pullbndimg at MHI / IHI?

will propose to SLAC from now

test cell fabrication -190 piecesmechanical check and RF check

special cell machining -20 piecescoupler, vacuum, HOM, etc.

coupler matching by KEK ----> cut and try

RF measurement before / after bonding at KEKbead-pull measurement system <---- KEK, Tsinghua, (SLAC)

one-shot bonding by KEK

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1 tech. + 0.5 eng.experimental setupcheck bonding performancenew small but clean furnace

targetoptimize diffusion bonding parameterstudy 1 O--20 cell bonding

VAC furnaceHigashi’s, machining center,double evacuate type, Hisamatsu’s, . ...?- -

H2 furnaceTakeuchi’s, SLAC

outside heatingShinku-riko

study itemsvat seal6f due to bondingcell alignment along structuremechanical strength

study parameters-. . surface flatness, roughness

dust on surfacechecking tool, stacking environment

chemical property on surfacecarbon, oxygen,

temperature pattern rising and coolingpressurede-burring process

pressing, water jet, EP, . . . .partial pressure in furnacemechanical constraintsurface treatment

High power test of DS

0.5 tech. + 0.5 act. + 0.2 eng.SLACAR-S variouscontrol

targetcomplimentary experiment to SLAC ASTAinvestigate conditioning and final performance

M2 at ASTA of SLACfor extreamly high power 300--400 MW

( E_NL=73MV/m at 13OMW)now being preparing final vacuum WG components

IHl at KEKevaluate conditioning process

record BD eventskeep high power / high field experience at KEK

the

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FIRST LC ISG WORKSHOP

SLAC

January 26-29, 1998

Summary Talk

WG 3: J. Rifkin

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FIRST LC ISG WORKSHOP

SLAC

January 26-29, 1998

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