slac ilc accelerator efforts

Tor Raubenheimer

SLAC ILC Accelerator Efforts

SLAC DOE Program Review

June 13th, 2007

International LinearCollider – Americas

Global Design Effort (GDE)Technically Limited Schedule

August

BCD

All regions ~ 5 yrs

Construction Startup

Siting Plan being Developed

2006 2010 2014 2018

RDR EDRBeginConst

EndConst

EngineerDesign

Site Prep

Site Select

R & D -- Industrialization

Gradient

e-CloudCryomoduleFull Production

System Tests

& XFEL

Detector Install

Detector Construct

Stolen from Barishat FNAL Users mtg

International LinearCollider – Americas ILC GDE Program

• The GDE ILC program has two portions:– Reference Design Report (RDR) Engineering Design (EDR)

• A conceptual design based on sample sites with a cost estimate

• Engineering efforts are being started for an EDR

– R&D Program

• Presently administered through the different regions

• ILC Global Design Effort will coordinate effort more globally

• ILC design timeline– Reference Design in completed in 2007 (RDR)

– Engineering Design based on supporting R&D in early 2010

• ILC Americas – Americas Regional Team (ART)– Effort spread between RDR and R&D programs

– Coordinated by Gerry Dugan and now Mike Harrison based onMOUs between GDE and labs

International LinearCollider – Americas SLAC Strengths in ILC

• Built and operated the 1st and only Linear Collider (SLC)– Operational experience

• High availability hardware, Instrumentation, Beam collimation, Emittance preservation, Damping ring instabilities

• Two-decades of next-generation linear collider R&D– X-band design program was very broad (not just RF design)– >70% of superconducting LC is actually normal conducting– Most of normal conducting experience is transferable

• Klystrons, modulators, and RF distribution• Particle sources, damping rings, beam delivery system • Strong MDI (Machine Detector Interface) group• Civil design

• Very motivated and strong group

International LinearCollider – Americas SLAC ILC and the GDE

• GDE formed with 63 people from all three regions:– Nine people from SLAC representing a breath of experience:

Chris Adolphsen, Tom Himel, Tom Markiewicz, Ewan Paterson, Nan Phinney, Tor Raubenheimer, Andrei Seryi, John Sheppard

• Developed the Reference Design Report (RDR) in CY06– Supposed to be the 1st priority this year– Big effort from SLAC group – roughly 50% of SLAC ILC FTEs

• Strong design & R&D program to be coordinated by the ART– RF sources and critical issues for Area Systems

• SLAC is playing a critical role in the ILC and the GDE– Bring both design and operational experience to the GDE– Leadership of RDR and Engineering Design (EDR)– Strong R&D program aligned with ILC priorities

International LinearCollider – Americas Reference Design Report

• What exactly is the RDR?– A 1st attempt at an international cost estimate for the ILC using

‘reasonable’ extrapolations from present technology• Baseline design mostly established at Snowmass, Aug. 2005 and

refined over the next year– Documented sufficiently to estimate cost based on sample sites – Draft report released at Beijing ILC meeting in Feb. 2007

• http://media.linearcollider.org/rdr_draft_v1.pdf– Final report (~300 pages) to be submitted to FALC in July, 2007

• Stated to be highest priority for the GDE in 2006/2007– Large SLAC participation both in leadership and details– SLAC expertise used to many fill roles that went unfilled ranging from

systems integration to Ring-To-Main-Linac to Dumps technical systems to report editing and production

International LinearCollider – Americas ILC Schematic

– 11km SC linacs operating at 31.5 MV/m for 500 GeV (31 km site)– Centralized injector

• Circular damping rings for electrons and positrons• Undulator-based positron source

– Single IR with 14 mrad crossing angle– Dual tunnel configuration for safety and availability


RDR Leadership Matrix(Organization to complete RDR)

• Matrix of Area Systems and Technical Systems to develop cost estimate– International representation in all working groups

Area Systemse- 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

Nan Phinney – RDR editor

International LinearCollider – Americas SLAC RDR Efforts

• SLAC has a broad program where we led many main elements of the ILC RDR design:– RF Power Sources and Main Linac (Chris Adolphsen)– Electron and Positron Sources (John Sheppard & Axel Brachmann)– Ring-To-Main-Linac (Peter Tenenbaum)– Beam Delivery System (Andrei Seryi)– Availability and Operations (Tom Himel & Nan Phinney)– Systems Integration (Ewan Paterson)

• In addition, there were/are smaller or supporting efforts in:– Damping ring design and low emittance transport (Yunhai Cai)– Normal conducting magnets & power supplies (Spencer & Bellamo)– Conventional facilities and Installation (Fred Asiri)– Controls and beam instrumentation (Ray Larsen)– Dumps and collimator design (Tom Markiewicz)

International LinearCollider – Americas Engineering Design Effort

(2007-2010)

• Presently discussing roles in Engineering Design (EDR)• We would like to have leadership roles in:

– Electron source – no others looking for role– Beam delivery system – working closely with UK

• Core strength of SLAC group– Rf power sources – critical issue

• Another core strength of SLAC group– Systems integration and overall parameters

• EDR organization is not yet formed– Talking with project managers and Barry Barish– Gathering engineering support at labs and developing work plans

• Likely need to fill other roles as well but cannot let these dilute the main effort

International LinearCollider – Americas ILC R&D and Technology

• Very High R&D priorities (categorized by Global R&D Board):– Superconducting cavities and gradient

• Gradient of 25 versus 35 MV/m

• Cavity tuners

– Rf sources

• Improved components for cost reduction

• Sheet beam klystron and new modulator designs

• Improved Rf distribution to deal with gradient variation

– High availability hardware

• Controls and instrumentation (ATCA)

• Power supplies and magnets

– Positron target

– Instrumentation (BPMs, laser wires, and energy spectrometers)

– Damping ring (collective effects, kickers and emittance)

– Beam delivery system (crab cavity, feedback and tuning)

SLAC

SLAC with DESY & ANL

SLAC with LLNL and UK

SLA

C

International LinearCollider – Americas Major Test Facilities

• End Station B– Created new L-band rf Test Facility

• Develop klystron, modulators and rf distribution for ILC• Test normal conducting structures for e+/e- sources• Construct coupler test facility

• End Station A– Study Interaction Region issues and instrumentation– Develop rf source test area to operate 24/7

• ATF/ATF-2 (Located at KEK but with big SLAC participation)– Test final focus system using very low emittance beam

• Will supply rf source, rf distribution, and couplers for ILCTA (linac test facility) at Fermilab and working on other linac test facilities around the world: TTF @ DESY and STF @ KEK


• Developing RF Sources for ILC– Wall plug to coupler – all ‘warm’ technology

• Developed new concept for modulator ‘Marx Generator’– Generally recognized as a desirable alternate to baseline – Goal is to down-select modulator technology at the end of 2007

• Baseline multibeam klystron still not in hand– Designing sheet beam klystron – risky but should offer lower cost– Would like to purchase Toshiba and CPI 10 MW tube for evaluation– Would like to contract CPI to develop conventional 5 MW tube

• RF distribution (waveguide, circulators and couplers)– Developing and testing elements of the rf distribution– Constructing a coupler test facility in ESB with LLNL

• Goal to develop 6 operating rf sources by end of 2009(8 Cavities per Cryomodule)

RF Sources(Chris Adolphsen in breakout)

International LinearCollider – Americas RF Test Stands

• Need to develop operating rf sources for ILC• Operating rf test stand in End Station B Chris Adolphsen

– Borrowed, begged, or stole most of the components

• Borrowed a high power modulator from SNS

• Purchased a 5 MW klystron for ~10% nominal cost

• Converted NLCTA infrastructure from X-band to L-band

– Using facility to test accelerator structures, coupler design issues, and rf distribution design, as well as process couplers

• Developing 2 new test stands in End Station B– One for a ‘direct-switched’ modulator that will come from DTI and one for

the 1st Marx generator prototype

• Ultimately would plan for 5 more rf stations in End Station A as well as 1 full rf unit at Fermilab– Need 10,000’s hrs on rf power systems to understand limits


RF Test Stand Development

L-Band Test Stands: Existing (green), FY08 (blue), FY09 (yellow)

ESA

ESB(NLCTA)

LCLS


Electron Source(Axel Brachmann in breakout)

• Polarized electron source– Baseline source similar to SLAC polarized electron source– Working on photocathode, laser, and systems design

• Optimizing photocathode for lower current with >90% pol.• Working on laser system and NC bunching and capture structures

• Designed e- system gundamping ring for RDRPolarized photocathode test facility

120KV DC gun with load lock


e- sourcee-

DR

e- Dump Photon Dump

e+

DRAuxiliary e- Source

Photon Collimators

Adiabatic Matching

Device

e+ pre-accelerator ~5GeV

150 GeV 100 GeV

HelicalUndulatorIn By-Pass

Line

PhotonTarget

250 GeV

Positron Linac

IP

Beam Delivery System

e- Target

Adiabatic Matching

Device

e- Dump

Positron Source(Axel Brachmann in breakout)

• Positron source – SLAC is coordinating the positron source development

• We lead the RDR design working with LLNL, ANL, and UK– Undulator-based positron source is a large system!– Focused on systems design and capture structure R&D

• Working with LLNL on target design• Working with ANL on AMD and

capture simulations• Working with UK on undulator design


Ring to Main Linac(Nan Phinney in breakout)

• Ended up responsible for this beam line– Spin rotators– Coupling correction– Pre-linac beam collimation– 180 turn-around

for feed-forward– Multi-stage bunch

compression– Emittance diagnostics

• Longest beamline inILC design– Complicated accelerator

physics

BC2

BC1

10 GeVPre-linac

Spin rotator

Couplingcorrection& collimation

180 turn-around


Beam Delivery System(Andrei Seryi in breakout)

IR HallService tunnelEmittance diag and

coupling correction

Tuning dump and fast extraction system

Collimation System

Main Dump


Beam Delivery System

• SLAC is leading the BDS development– Working with UK on optics and R&D on technical components with:

• BNL on compact FD quadrupoles for 14 mrad X-ing • FNAL on background simulations and crab cavity development• UK on beam dumps and collimators• World-wide MDI group studying push-pull and detector issues

• Additional R&D at End Station A and ATF2 test facilities– Andrei Seryi is co-spokesperson for ATF2 project at KEK

• SLAC is making large contributions to ATF2 at KEK– Mike Woods leading End Station A ILC studies

• Instrumentation development (rf BPMs and spectrometers)• Collimator wakefield measurements• Electromagnetic interference (EMI) effects

End Station A Test FacilityEnd Station A Test FacilityFor Prototypes of Beam Delivery and IR ComponentsFor Prototypes of Beam Delivery and IR Components

CCLRC LLNL QMUL U. of Bristol UMass Amherst

CERN Lancaster U. SLAC UC Berkeley U. of Oregon

DESY Manchester U. TU Darmstadt U. of Cambridge

KEK Notre Dame U. of Birmingham UCL

http://www-project.slac.stanford.edu/ilc/testfac/ESA/esa.html

Collimator design, wakefields (T-480)BPM energy spectrometer (T-474)Synch Stripe energy spectrometer (T-475)IP BPMs, kickersEMI (electro-magnetic interference)IR MockupOngoing program in 2008

PAC05 paper/poster: SLAC-PUB-11180, e-Print Archive: physics/0505171

International LinearCollider – Americas ATF-2 at KEK

• ATF-2 will be the BDS test facility– Follow-on to FFTB– New FFS optics– Operational issues– Train next generation

http://lcdev.kek.jp/ILC-AsiaWG/WG4notes/atf2/proposal/public/atf2-web.pdf

New final focus

ILC like optics at ATF-2

Andrei Seryi co-spokespersonfor ATF2


Availability and Operations(Nan Phinney in breakout)

• The ILC will be an order of magnitude more complex than any accelerator ever built– If it is built like present HEP accelerators, it will be down an order of

magnitude more (essentially always down)– For reasonable uptime, component availability must be much better

than ever before requires serious R&D

• R&D on– Power supplies – building 40 supplies for installation in ATF2– Normal conducting magnets – started this as part of NLC program– Control system – started investigations in ATCA standard– Component diagnostics – developing small diagnostic board with

Pohang Accelerator lab and Argonne– LLRF and timing system – working with large collaboration

DeviceRequired MTBF

Improvement FactorMTBF from Present

Experience (khours)

magnets - water cooled 20 1,000power supply controllers 50 100flow switches 10 250water instrumention near pump 10 30power supplies 5 200kicker pulser 5 100coupler interlock sensors 5 1,000collimators and beam stoppers 5 100all electronics modules 10 100AC breakers < 500 kW 10 360vacuum valve controllers 5 190regional MPS system 5 5power supply - corrector 3 400vacuum valves 3 1,000water pumps 3 120modulator 50klystron - linac 40coupler interlock electronics 1,000


High Availability Power Supplies

• HA design to be demonstrated at ATF2 using n/M config– US-Japan funds allocated after initial demonstration– 40 supplies to be sent in FY08– Concept is also useful for LCLS

International LinearCollider – Americas Supporting Roles

• Conventional facilities– Make connection between Area System and conventional group– Developed Installation model for RDR

• Damping ring– Collective effects, primarily ECI and SEY reduction– Damping ring kicker system

• Low Emittance Transport and SciDAC– Led this field for years -- Educating new participants– Tightly tied to understanding of operational issues

• Beam instrumentation– Group has led instrumentation development: ATF BPMs, rf BPMs, TTF

HOM detectors, laser wires

• Control system high-availability hardware– Led effort to start study of industrial ATCA standard

International LinearCollider – Americas Simulation & Computing

• Effort on electromagneticand beam dynamicsimulations

• Leading efforts in both:– ILC group simulating LET

and electron cloud instabilities– ACD group doing EM calcs

Omega3p model (SciDaQ)

TDR cavity with elliptical cell shape

1.E+03

1.E+04

1.E+05

1.E+06

1.E+07

1.60E+09 1.65E+09 1.70E+09 1.75E+09 1.80E+09 1.85E+09 1.90E+09

F (Hz)

Qextdeformed cavity

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

Single-bunch instability thresholds

1.0E+10

1.0E+11

1.0E+12

1.0E+13

TESLA MCH DAS 2 xBRU

2 xOCS

OCS BRU OTW PPA PEP-IILER

KEKBLER

clo

ud

den

sity

[m

^-3]

Instability thresholdSEY=1.2SEY=1.2 + solenoidSEY=1.4SEY=1.4 + solenoid17 km range 2 x 6 km 6 km

3 km

arc vacuum pipe round 22mm; wigglers design as TESLA TDR;photon reflectivity 80%

Electron cloud instability rates

• Peter Tenenbaum is an ILC representative for SciDAC

International LinearCollider – Americas Civil Design Effort

• Conventional Facilities group has two goals:– Work with local Area System leaders (Electron Source, Positron Source,

RTML, and BDS) to specify and optimize civil design• Space, power, cooling, layout• Access and safety

– Develop installation plan• Both tunnel installation

as well as receiving, testing, and warehousing

• Group works closely with FESS group at Fermilab on development of a US sample site

Central injector and BDS beam lines

International LinearCollider – Americas SLAC ILC Goals EDR and Beyond

• Have leadership roles in the ILC design, construction and ops– Focus on ‘Area’ system in the:

• Beam Delivery System

• Electron Sources

– Develop technical system designs for:

• RF Power Sources

– Lead the Systems Integration and overall parameters choices

– Contribute to many other systems throughout the design

• Large responsibility but we bring the expertise – Basic goals outlined in 2003 SLAC Scenarios Study

• This is still a very good fit to SLAC resources and abilities

– We need to develop the engineering capability for these goals and focus our efforts more narrowly

– Need to understand concepts for ILC construction and operations

International LinearCollider – Americas Planning for FY08/FY09

• Planning done in the context of delivering a EDR in 2010– Need to develop an integrated schedule as part of EDR

• Working with ART to develop budgets• FY08 request has increase in funding for rf sources and an

increase in engineering for the EDR• Working on detailed milestones & work-packages for EDR

– Difficult because nobody knows who’s doing what yet

• Will rebalance FY08 budget after EDR organization and plans are formed

International LinearCollider – Americas Summary

• Broad program– SLAC ILC group is recognized as excellent throughout the world

• ILC effort builds on core SLAC strengths

• Strong design effort with beam dynamics studies, integrated R&D and engineering studies

– Focused on rf sources, particle sources, BDS, and operation issues

– Developing plans through the EDR in 2010

• Need to have more focused effort than on RDR

• R&D program is well matched to ILC needs– RF source work is needed for ILC project – needs differ from XFEL

– High availability hardware is essential for operations

– Working on test facilities at KEK, DESY, and FNAL

– Program is not duplicated at other laboratories around the world

• SLAC expertise underpins the ILC effort

slac ilc accelerator efforts

Documents

rdrengineering design

beijing ilc meeting

gdeleadership of rdr

slac group

yearbig effort

pdffinal report

rd programscoordinated

large slac participation