Project X RD&D Plan325 MHz Linac including High Intensity Neutrino Source

(HINS) ProgramBob WebberAAC Meeting

February 3, 2009

Page 2AAC, February 3, 2009 – Bob Webber

Outline

• Scope of the 325 MHz Linac section• Requirements of the 325 MHz Linac section• Current Configuration of the 325 MHz Linac• Primary technical issues• Description of the role and scope of the HINS program• Strategy to address technical issues • Goals of the RD&D plan by year• Possible collaborators• Summary

Page 3AAC, February 3, 2009 – Bob Webber

325 MHz Linac Scope

• To be clear, there is just one Project X Linac based on an integrated and comprehensive accelerator physics design to meet Project X beam requirements

• Project X Initial Configuration Document (ICD) specifies two major Linac subsystems:– A front end linac operating at 325 MHz– An 8 GeV linac operating at 1300MHz

• The differentiation is for project management convenience • The 325 MHz Linac subsystem:

– Comprises the low-energy end of the Project X Linac– Includes the ion source and the entire accelerator upstream of the

1.3 GHz cavity section

Page 4AAC, February 3, 2009 – Bob Webber

325 MHz Linac Requirements

• Serve as the low-energy front-end to the 1.3 GHz Linac section• Deliver 1.25 msec pulses of 1.6E14 H- ions at 420 MeV at pulse

rates up to 5 Hz• Provide transverse and longitudinal beam emittance and bunch

parameters required to:– Match into the 1.3 GHz Linac– Avoid unacceptable beam losses at high energies

• Incorporate, into the 1.25 msec beam pulse, a 53 MHz structure to facilitate pseudo bunch-to-bucket transfer into the Recycler Ring and an 89 kHz structure to facilitate a 700 microsecond abort/extraction gap in the Recycler ring

Page 5AAC, February 3, 2009 – Bob Webber

325 MHz Linac Configuration per ICD

• Configuration is based on Proton Driver/HINS design and technologies• 50 keV H- ion source• 2.5 MeV RFQ• 2.5 MeV Medium Energy Beam Transport (MEBT) including two re-buncher

RF cavities and a 325 MHz beam chopper• Sixteen copper crossbar-H cavities in room temperature section to 10 MeV• Eighteen β=0.22 SC single-spoke resonator (SSR1) cavities to 30 MeV• Thirty-three β =0.4 SC single-spoke resonator (SSR2) cavities to 120 MeV• Forty-two β =0.6 SC triple-spoke resonator (TSR) cavities to 420 MeV• SC solenoids provide transverse focusing from the RFQ through the SSR2

section• SC quadrupoles provide transverse focusing starting in the TSR section.• Seven (eight)Toshiba E3740A(Fermi) 2.5 MW klystrons driven by Fermilab

bouncer-type pulse modulators provide the necessary RF power • RF distribution system with fast ferrite vector modulators for amplitude and

phase control of each individual

Page 6AAC, February 3, 2009 – Bob Webber

325 MHz Linac Technical Issues

• The RD&D Document identifies 325 MHz Linac issues as:– Physics Design– Ion Source– Accelerating structure design– RF power, distribution and control systems– Magnets, magnet power supplies, and other DC/pulsed power supply

systems– Cryogenics– Controls– Beam Instrumentation

Page 7AAC, February 3, 2009 – Bob Webber

325 MHz Linac Technical Tasks

• First task is to re-assess and validate or modify the ICD configuration• Within the context of the comprehensive Project X design, with realistic

upgrade paths considered, and based on a performance/cost/risk assessment– Establish the physics design of the 325 MHz Linac – Establish the transition energy between 325 and 1300 MHz Linac sections– Identify the “technology of choice” for accelerating structures and focusing elements,

e.g. HINS or more conventional technologies– Identify “technology of choice” for RF power generation, distribution, and control

• Technical development tasks assuming the ICD configuration– Issues being addressed by HINS Program

Room Temperature Linac section design SSR1 cavity and cryostat development High Power RF vector modulator development Solenoidal focusing system development

– Development of SSR2 and Triple-spoke SC cavities and spoke cavity cryomodules– Incorporation of beam instrumentation into the physics and mechanical design

• Generation of CD-1 and CD-2 level engineering design and documentation for all 325 MHz Linac systems

Page 8AAC, February 3, 2009 – Bob Webber

Goals of HINS Program

• Stated Mission - To address accelerator physics and technology questions for a new concept, low-energy, high intensity, long-pulse H- superconducting Linac; in particular, to demonstrate:– beam acceleration using superconducting spoke-type cavity

structures starting at a beam energy of 10 MeV– multiple high power RF vector modulators controlling RF cavities

driven by a single high power klystron for acceleration of a non-relativistic beam

– beam halo and emittance growth control by the use of solenoid focusing optics

– a fast, 325 MHz bunch-by-bunch, beam chopper • The recent scope of HINS included two CM of β = 0.2 SSR1 and

one CM of β = 0.4 SSR2 spoke cavities to achieve 60 MeV• The SSR2 CM effort was recently dropped from the program

Page 9AAC, February 3, 2009 – Bob Webber

HINS vis a vis Project X

• Management and funding of HINS currently remains independent of, but not oblivious to, Project X

– HINS managers participate intimately in Project X developments• HINS efforts are expected to continue in support of Project X technology

choices and upgrade options• Integration of HINS management and funding with Project X will be

considered subsequent to Project X CD-0• Whether/when the integration actually occurs will be strongly coupled to

whether or not HINS is expected to serve as the Project X front end– If yes, the answer is obviously quick and complete integration– If no, the intent would be to keep HINS as a separate program aimed at a Project

X upgrade developments• HINS is the path to achieve technology demonstrations that are important to

Project X in the 2009-2012 time frame• HINS future scope

– Currently includes two SSR1 CM taking beam to 30 MeV– the original HINS goals could be substantially achieved with 20 MeV beam

provided by just one SSR1 CM

Page 10AAC, February 3, 2009 – Bob Webber

RFQ Installed in HINS Facility

Page 11AAC, February 3, 2009 – Bob Webber

Recent SC Spoke Cavity VTS Q vs E Results

Blue - Q vs. E first (lower) and second (upper) power sweep

Red – measured radiation

Orange- Q vs. E at 2 K

Blue (small) – Q vs. E at 4 K

Green – Q vs. E at 4 K after second, slow cool down holding at ~100 K for ~ 7 hrs to ‘invite’ Q disease

Blue (large) –radiation at 4 K

Red –radiation at 2 K

RF power limited

Page 12AAC, February 3, 2009 – Bob Webber

Technical Strategy

• Global Linac Physics and Engineering Design– Establish a performance/cost/risk assessment basis for judging alternative

designs– Identify credible technical alternatives within the requirements of the

comprehensive Linac physics design– Flesh out the performance and engineering aspects of alternative technologies to

the point of being able to assign performance, cost, and risk weights– Make decisions

• Continue HINS R&D Program– Integrate with Project X as suitable– Develop, test and demonstrate with beam

SSR1 cavities and cryomodule High power RF vector modulator Solenoidal focusing elements

• Establish collaborative commitments as soon as possible• Following decision on comprehensive design and technology decision

– Begin SSR2 and TSR cavity and cryomodule or alternative accelerating structure developments with the efforts of collaborators

Page 13AAC, February 3, 2009 – Bob Webber

325 MHz Linac RD&DGoals and Timeline

• FY09– Continue work on comprehensive accelerator physics design– Investigate and document alternative technologies– Produce all documentation, based on current ICD document, required for positive

CD-0 decision– Continue HINS program emphasizing goals important to Project X, especially first

pulsed power test of SSR1• FY10

– Establish collaboration commitments– Continue HINS program– Complete the basic 325 MHz Linac design and technology decisions– Begin

Ion source development, SSR2 and TSR cavity electromagnetic and mechanical design (or alternate

technology) and procure material for prototypes Low level RF development Systems integration efforts for other 325 MHz Linac systems

– Produce CDR documentation required for positive CD-1 decision in early FY11

Page 14AAC, February 3, 2009 – Bob Webber

325 MHz Linac RD&DGoals and Timeline

• FY11– Continue

Ion Source prototyping and testing SSR2 and TSR (or alternate) prototype fabrication Vector modulator and RF distribution system development Beam instrumentation prototype design and fabrication

– Begin documentation and cost baselines required for CD-2 in FY12• FY12

– Complete fabrication and processing of prototype accelerating structures; begin testing with RF power

– Complete Ion source development RF power distribution system design development Beam instrumentation prototyping

– Complete all documentation required for positive CD-2 decision in FY12

Page 15AAC, February 3, 2009 – Bob Webber

325 MHz Collaborators

• Some expressions of interest from the November 2008 Project X Collaborators Meeting

– ANL Physics design and tracking simulations Spoke cavity and cryomodule development, esp. triple spokes

– CERN Chopper development High power RF vector modulator development

– Indian institutions All aspects of superconducting cavity, power coupler and cryomodule design, fabrication,

and testing– JLAB

SC cavity processing and dressing Cryogenics systems design

– LBNL Low level RF Low energy (RFQ/MEBT) section design and components Beam Instrumentation

– SNS Ion Source

Page 16AAC, February 3, 2009 – Bob Webber

Summary

• The Project X ICD describes the 325 MHz low-energy section of the Project X Linac extending to 420 MeV and based on HINS technologies

• First priority post-CD-0 effort is to confirm or modify this configuration based on alternative design, performance, cost, and risk studies

• The HINS program actively pursues and is accomplishing technological developments important to Project X and its upgrade paths

• Integration of HINS management and funding with Project X will be considered after Project X CD-0 in a manner and at a time likely influenced by Project X alternative technology assessments

• The January 2008 RD&D document identifies the issues important to the 325 MHz Linac and lays out a timeline for addressing those

– With the addition of SSR2 design, the issues remain otherwise unchanged– Schedule needs to be shifted by one year

• Potential collaborators for major 325 MHz Linac systems and components have made their interests known