June 13, 2007 Global Design Effort 1 ILC Effort at SLAC RDR > EDR Nan Phinney SLAC/GDE.

June 13, 2007 Global Design Effort 1

ILC Effort at SLACRDR > EDR

Nan PhinneySLAC/GDE


RDR – a major effort in 06/07

Original Schedule was complete draft by Nov 06 but cost re-optimiation forced delays

Drafts due to editors in late Dec 06

‘Critical’ sections approved by EC at Beijing in Feb 07 and released

Complete draft of all sections was released Apr 1, 07 except Executive Summary & EDR chapterstill refining graphics, updating costs, references

International Cost Review held May 24/25 in Orsay

Final release for FALC 7/11 & ILCSC 8/15 with Executive Summary, Detector Concept Report


RDR MatrixMatrix of Area Systems and Technical Systems to

develop design and cost estimateInternational representation in all working

groups e- source e+ source Damping Rings RTML Main Linac BDS

Kiriki Gao ES Kim Hayano Yamamoto

Guiducci Lilje Angal-Kalinin

Brachmann Sheppard Wolski Tenenbaum Adolphsen Seryi

Logachev Zisman Solyak

Technical SystemsVacuum systems Suetsugu Michelato NoonanMagnet systems Sugahara TompkinsCryomodule Ohuchi Pagani CarterCavity Package Saito Proch MammosserRF Power Fukuda LarsenInstrumentation Urakawa Burrows RossDumps and Collimators Ban MarkiewiczAccelerator Physics Kubo Schulte

Global SystemsCommissioning, Operations & Reliability Teranuma Elsen HimelControl System Michizono Simrock CarwardineCryogenics Hosoyama Tavian PetersonCF&S Enomoto Baldy KuchlerInstallation Shidara Bialowons Asiri

SLAC contributions in red

RDR Management group:Nick Walker, Tor Raubenheimer, Kaoru Yokoya, Ewan Paterson, Wilhelm Bialowons, Peter Garbincius, Tetsuo Shidara


SLAC role in RDRRDR Chief Editor – NP with co-editors Toge (KEK), Walker (DESY)+ major help from Bharadwaj, Tenenbaum

SLAC was ~ only contributor to e- Source, RTML, Dumps, Installation

SLAC was lead author for those 4 sections + e+ Source, Linac, BDS, OPS, Mod, Klys, rf distr’n

SLAC was major contributer to costing formagnets, e+, e- & rf sources, dumps, CFS, install’n

SLAC provided Systems Integration & graphics support


RDR Design Changes

Central Injector proposed and coordinated by Paterson with SLAC e-, e+ sources, RTML, BDS area leaders

January 06 Baseline


Central Injector

January 07 RDR Configuration

Damping rings now centrally located in common tunnele- source, e+ 5 GeV linac, DR all located 10 m above BDS for

early commissioning during linac installation


Central Injector > DR

Current schematics have tunnels vertically offset


Tuneu

p Dum

ps (2

20 kW

each

)

Ring To Main Linac: Schematic

RTML was completely redesigned for Central DRsnow the longest system in the entire ILC


In linac tunnel, follows curvature from gravitational equipotential

38 m quad spacing, 45° FODO cell except in vertical arcs

0 5000 10000 150000

50

100

150

x,y [

m]

Twiss Functions of Long Transfer Line

0 5000 10000 15000-5

0

5x 10

-3

S Position [m]

y [m

]

RTML Return Line

Transport low emittance beam


Control System Design

SLAC proposed new standard for controlsATCA – Advanced TeleCommunications Architecture

Cost effective platform for High Availability

SLAC/UIUC collaboration on test prototype

XFEL is adopting ATCA Detectors interested too

Dual Network Switch Module Locations

Dual Star Fabric Connectors

48V DC Power Plugs

Redundant Shelf Manager Cards

Fan area


EDR Phase

SLAC will likely lead e-, BDS, RF sources & Linac designbut expect others to take over e+ and RTML

SLAC will lead Installation planning CFS study shallow site, provide liaison to AS

Critical R&De- source, RF sources, BDS (previous talks)DR electron cloud (M. Pivi is WP leader)DR kickers (2 projects)High Availability Power Supplies & DiagnosticsBeam Dynamics/Wakefield Simulations (SciDaq)


Very High Priority DR R&D

2.1.1.1 Lattice design for baseline positron ring

2.1.1.2 Lattice design for baseline electron ring

2.1.4.3 Demonstrate < 2 pm vertical emittance

2.2.1.2 Characterize single bunch impedance-driven instabilities

2.2.3.1 Characterize electron cloud build-up

2.2.3.2 Develop electron cloud suppression techniques

2.2.3.3 Develop modelling tools for electron cloud instabilities

2.2.3.4 Determine electron cloud instability thresholds

2.2.4.1 Characterize ion effects

2.2.4.2 Specify techniques for suppressing ion effects

3.5.1.1 Develop a fast high-power pulser

WP 2.1.1

WP 2.1.4

WP 2.2.1

WP 2.2.3

WP 2.2.4

WP 3.5.1

11 "Very High" priority items divide into 6 Work Packages

A. Wolski - S3


Multi-pronged program

Simulations (SLAC, KEK, LBNL)

Secondary Yield studies

Test sample chamber in PEP-II

Chambers with fins to trap e-

E-cloud R&D Program

Mauro Pivi


SEY test station in PEP-II LERSEY test station in PEP-II LERSEY test station in PEP-II LERSEY test station in PEP-II LER

Manipulator at 0o positionPEP-II LER

e+

Manipulator at 45o position

Samples location inside beam line

Isolation valves (2)

ILC tests, M. Pivi et al. – SLAC


SEY test chamber samples - TiN

Secondary Yield after two months of conditioning in PEP-II LER

SEY recontaminationSEY before/after conditioning

SEY increases slightly if sample is left under vacuum following conditioning


LER#1

XPS Before installation XPS After exposure in PEP-II LER for 2 months (e dose 40mC/mm^2)

Carbon content is strongly reduced after conditioning with synchrotron radiation + electrons + ions in PEP-II LER. This is completely different from laboratory tests with electron (only) conditioning where carbon crystals actually grow.

Surface analysis: Carbon content decrease

X-ray photon spectroscopy

ILC tests, M. Pivi et al. – SLAC


M. Pivi – L. Wang – T. Raubenheimer - P. Raimondi, SLAC. Mar 2006

M. Pivi – L. Wang – T. Raubenheimer - P. Raimondi, SLAC. Mar 2006

Layout of the clearing electrodes in ILC DR BEND vacuum chamber +100V clearing electrodes suppress

electron cloud buildup

E-cloud Clearing Electrodes


System availability studies

Design of high availability hardware (SLAC, LLNL)Kickers, Power supplies, diagnostics, and control

system

General control system design (with ANL, FNAL, …)

Fast (redundant)

kicker for DR

High Availability Design

Modular 4 of 5 power supply

with auto-failover


TESLA Cavity Imperfection Study

Omega3p model (SciDaQ)

TTF module 5: 1st-2nd dipole band

1.E+03

1.E+04

1.E+05

1.E+06

1.E+07

1600 1650 1700 1750 1800 1850 1900

F (MHz)

Qex

t

1.E+03

1.E+04

1.E+05

1700 1701 1702 1703 1704 1705 1706

1st band 6th pair

1.E+04

1.E+05

1.E+06

1877 1878 1879 1880 1881 1882

2nd band 6th pair

Actual cell shape differs from the ideal due to fabrication errors, stiffening rings, frequency tuning process

deformed cavity

Black – designRed/Blue – after cell deformation (#4, …)


SummaryRDR

SLAC had a major role in the design of all area systems, cost optimization and costing

SLAC led the editing and authored > 1/3 of the sections

Critical R&DSLAC has a major role in e- sources, simulations,

RF - modulators, klystrons, distribution & couplers, e- cloud mitigation, DR kickers, BDS, MDI, ATF-II

EDRSLAC leads e- source, BDS, RF sources, Linac design,

Installation planning, System Integration

June 13, 2007 Global Design Effort 1 ILC Effort at SLAC RDR > EDR Nan Phinney SLAC/GDE.

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