High Intensity Neutrino Source HINS Linac Front-End R&D --- Systems Integration, Beam Diagnostics Needs, and Meson Lab Setup Bob Webber

Fermilab 2 Motivation and Timeline Motivation – –Test key un-proven technologies important to the low- energy front-end (β<0.4) section of the proposed 8 GeV Superconducting H- Linac Timeline – –Accomplish the R&D necessary to establish technical credibility and cost basis for the Linac front-end by ~2010 Funding Resources – –$10M in FY06 (FNAL and collaborators; SWF and M&S) –similar funding projected for FY07 and 08 until recent rumblings from DOE (within the last 4 weeks)

Fermilab 3 R&D Objectives Demonstrate high power RF distribution and 4.5 millisecond pulse operation of multiple cavities from a single klystron Demonstrate device and system performance of high power vector (IQM) modulators for amplitude and phase control of multiple cavities Measure axially-symmetric beam performance with RT-CH (room temperature, crossbar H-type) spoke resonator cavities and SC solenoid focusing in the RT Linac Demonstrate low transition energy (10 MeV) to and application of superconducting spoke resonator accelerating structures Demonstrate high-speed (nanosecond) beam chopping at 2.5 MeV Demonstrate performance of this Linac concept and resulting beam quality to 90 MeV

Fermilab 4 R&D Plan Install and commission 2.5 MW, 325 MHz klystron system Equip and operate a 325 MHz high power RF component test facility Fabricate, install, and operate a test cryostat for 325 MHz SC spoke cavities Construct and test key components of the low-energy Linac concept Assemble the 10 MeV RT Linac, operate with beam, and verify performance Install 325 MHz SC spoke resonator cryomodules and operate with beam up to 90 MeV This all adds up to building a first-of-its-kind superconducting 90 MeV H- linac

Fermilab 5 Major Activity Areas in Meson 325 MHz Klystron and Modulator Area 325 MHz RF Component Test Facility Cavity Test Cave (RT-CH and superconducting cavities) Ion Source, RFQ, and 2.5 MeV Absorber Area 90 MeV Accelerator and Beam Absorber Cave

Fermilab 6 Meson Building Floor Plan 90 MeV Linac Klystron and Modulator Area RF Component Test Facility Cavity Test Cave 200 ft. Ion Source and RFQ Area

Fermilab 7 View Into Klystron/Modulator Area (early May)

Fermilab MHz 2.5MW Klystron (early May)

Fermilab msec Klystron Pulse Transformer (early May)

Fermilab MHz Waveguide Circulator (early May)

Fermilab 11 View Into Klystron/Modulator Area (June 9)

Fermilab 12 View Into Klystron/Modulator Area (June 9)

Fermilab 13 Klystron and Waveguide (June 16)

Fermilab 14 Modulator Capacitor Cabinet (front) (June 28)

Fermilab 15 Modulator Switch Cabinet (back) (June 28)

Fermilab 16 Modulator Switch Cabinet (front) (June 28)

Fermilab 17 View Down (Future) Linac Beam Line

Fermilab 18 Layout Through Second β=.4 Cryostat Ion SourceRFQMEBTRoom Temperature 16-Cavity, 16 SC Solenoid Section Two Β=0.4 SSR 11-Cavity, 6-Solenoid Cryostats Two Β=0.2 SSR 9-Cavity, 9-Solenoid Cryostats 2.5 MeV50 KeV 10 MeV 20 MeV 60 MeV 30 MeV 90 MeV

Fermilab 19 Meson Linac Cave Cross-section

Fermilab 20 Beam Diagnostics - Minimum on-line (P. Ostroumov) Current transformers (CT) Beam phase pick-up – necessary to control energy stability during the operation Initial tune-up of the cavity field and phase Beam profile wire scanners (or/and laser scanners) Beam loss monitors – about 20 – distribute along the linac Inter-cryostat space should include –CT –BPM, includes phase pick-up –Wire scanner

Fermilab 21 Off-line (temporary installation) The temporary diagnostics station is desirable to use at the end of the following linac sections RFQ+MEBT, RT section, SSR1, SSR2 - will be permanent place Diagnostics station includes (minimum set) 1 solenoid (or 3 quads, triplet) 2 steering magnets 2 BPMs, includes phase pick-up 3 profile monitors 2 current transformers Beam dump –water cooled Energy degrader Faraday cup Fast Faraday cup CCD camera with the quartz foil Maximum set, extend for –Emittance station – slit-collector – copy from SNS –Bunch length – custom design

Fermilab 22 Machine and Beam Parameters Two operating modes providing 1.56E14 ppp –3 millisecond 8.6 mA average beam pulse at ≤ 2.5 Hz –1 millisecond 26 mA average beam pulse at ≤ 10 Hz Bunch Frequency – 325 MHz –(1/4 of ILC 1.3 GHz) –Chopped in MEBT (2.5MeV) at 53 MHz (~ 2 of 6 bunches missing) and at 89 KHz (~1.6 microsecond gap); therefore peak beam current is ~1.5 times average current stated above Beam tube aperture –20mm bore radius through focusing solenoids; 15mm? through warm RF cavities

Fermilab 23 Baseline - 05/15/06 – Trans. envelopes

Fermilab 24 MEBT – June 12, 2006: Dimensions OK Increase this space and use it for the steering magnet

Fermilab 25 CH-SSR1 Strip-line BPM This space can be increased up to 204 mm

Fermilab 26 So What is Needed Now? Beam current transformer electromechanical designs BPM pick-up electromechanical design(s) for RT and SSR Linac sections Scanning wire electromechanical designs Laser wire design Beam phase monitor system design Beam energy analysis system Beam bunch length monitor? Electronics for all above

Fermilab 27 SNS Diagnostics plate

Fermilab 28 BPM (SNS)

Fermilab 29 Meson Schedule 2006 Short “mock” Linac cave section available –May 2006 Klystron modulator completion –July 2006 (late July) 325 MHz RF power system commissioning –July 2006 (early August) 325 MHz component testing in RF test area –Starting August MHz RT cavity power testing in cavity test cave –September 2006 Superconducting cavity test cryostat installation –October 2006 Ion Source installation in Meson –November 2006

Fermilab 30 Meson Schedule 2007 RFQ (now in procurement) delivery and power testing –January 2007 RT cavity and coupler testing –Starting February MeV beam tests –Beginning February 2007 First SC spoke resonator power tests in test cryostat –April 2007 Linac cave construction and utilities installation –May 2007 Demonstration of multiple cavity RF distribution and independent amplitude & phase control –July 2007 Beam accelerated through first ‘N’ RT cavities –September 2007 (optimistic)

Fermilab 31 Meson Schedule 2008 Full 10 MeV RT linac installed –April 2008 R&D beam operations at 10 MeV –Starting May 2008 First SC spoke resonator cryomodule installation –October 2008 Tests of RT + SC cavity RF distribution and independent amplitude & phase control –November 2008 Beam through first SC spoke cryomodule –December 2008 (optimistic)

Fermilab 32 Manpower Resources A Lab-Wide effort is required and now being applied –Beam line components are designed and procured by Technical Division –RF and conventional power source components and systems integration and operation are the responsibility of the Accelerator Division –Particle Physics Division is supplying manpower for utilities and infrastructure installation in the Meson building –Laboratory Safety Section and Accelerator Division Safety Department are already at this early stage actively involved Key technical systems now lacking required attention –RF power distribution system (tightly coupled with cavity design status and power requirements) –Low level RF systems – system design, modeling, hardware (partially mitigated via LBNL MoU) –Cryogenics delivery system engineering for the Meson Linac cave –Beam instrumentation design (partially mitigated by BNL MoU)

Fermilab 33 Summary Considerable activity is now underway on component design, procurement, and facilities to support planned R&D It will be an exciting next 12 months to bring 325 MHz klystron and RFQ on-line and to accelerate beam in the Meson Building Key areas, presently lacking effort necessary to maintaining desired schedule, are identified

Fermilab 34 Backup Slides

Fermilab 35 Meson Building Floor Plan

Fermilab 36 Modified, 05/25, Trans. envelopes