Bob Webber

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

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)

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

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

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

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

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

8. 325 MHz 2.5MW Klystron (early May)

9. 4.5 msec Klystron Pulse Transformer (early May)

10. 325 MHz Waveguide Circulator (early May)

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

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

13. Klystron and Waveguide (June 16)

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

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

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

17. View Down (Future) Linac Beam Line

18. Layout Through Second β=.4 Cryostat Ion Source RFQ MEBT Room Temperature 16-Cavity, 16 SC Solenoid Section 50 KeV 2.5 MeV 10 MeV Two Β=0.2 SSR 9-Cavity, 9-Solenoid Cryostats 20 MeV 30 MeV Two Β=0.4 SSR 11-Cavity, 6-Solenoid Cryostats 90 MeV 60 MeV

19. Meson Linac Cave Cross-section

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

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

22. Machine and Beam Parameters • Two operating modes providing 1.56E14 ppp • 3 millisecond 8.6 mAaverage beam pulse at ≤ 2.5 Hz • 1 millisecond 26 mAaverage 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

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

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

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

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

27. SNS Diagnostics plate

28. BPM (SNS)

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 2006 • 325 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

30. Meson Schedule 2007 • RFQ (now in procurement) delivery and power testing • January 2007 • RT cavity and coupler testing • Starting February 2007 • 2.5 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)

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)

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)

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

34. Backup Slides

35. Meson Building Floor Plan

36. Modified, 05/25, Trans. envelopes