ILC and AARD plans at New Muon Lab Sergei Nagaitsev

1. ILC and AARD plans at New Muon Lab Sergei Nagaitsev

2. ILC S2 recommendation • ILC S2 task force (string test definition) recommends: the minimum size system test needed to confirm the performance of a new design is a single RF unit with ILC like beam. • ILC RF unit is 3 CMs powered by a 10 MW MBK • Many tests are statistical in nature, a longer string test with several RF units would be better. Nagaitsev

3. Why beam tests? • Cryomodule gradient calibration with beam energy spectrometer; there could easily be a 5-10% uncertainty in rf calibrations. • Need energy spectrometer upstream and downstream of CMs. • Many tests can be done at the Horizontal Test Stand. What is missing: • Beam loading effects; • HOM excitations; • Cavity alignment; • Check static and dynamic heat loads • Allows to train personnel by “doing” it. Nagaitsev

4. NML • NML is a facility to be located in the existing building at Fermilab (New Muon Lab) • New Muon Lab building is part of Fermilab’s ILC Test Areas (ILCTA_NM) • Other areas are: MDB (horizontal SCRF cavity test stand), IB1 (vertical test stand) etc. • The first NML user will be the ILC program. • The cryomodule tests are also essential to Project X (β=1) • The Accelerator R&D (AARD) portion will first piggy-back on these programs; its share will increase with time Nagaitsev

5. Fermilab NML plans • The NML is being constructed to address primarily the ILC S2 R&D list • However, our plans go beyond S2. We would like to include elements of S4 R&D tasks (crab-cavities), diagnostics development, personnel training, and accelerator R&D. • The NML facility is staged (1 CM, 2 CMs etc); when complete, it would include 1 (or 2) rf units running ILC-like beam at 5 Hz. • 1 rf unit with beam requires building an extension tunnel and a new cryo-plant • The progress is resource limited Nagaitsev

6. NML Project Overview • Overall Plan • Build an ILC RF Unit Test Facility at New Muon Lab Building (NML) • One ILC RF Unit (3 Cryomodules) • 10-MW RF System • ILC-like Beam (3.2 nC/bunch @3 MHz, Up to 3000 bunches @ 5Hz, 300-μm rms bunch length) • Phase-1 (FY07 - FY08) • Prepare Facility for Testing of First Cryomodule (CM1) without Beam • Infrastructure; RF Power; Cryogenics (Refrigerator #1) • Phase-2 & 3 (FY08 - FY11) • Install Gun, Injector, CM2 and CM3, Test with Beam • New RF Gun • Move A0 Photo-Injector to NML and Install Test Beamlines • Extend Building to fit Third Cryomodule • Cryogenics (Refrigerator #2 and New Cryoplant-300W) • Upgrade RF System to 10 MW Nagaitsev

7. Phase-1 Layout of NML Capture Cavity 2 (CC2) Cryomodule-1 (CM1) (Type III+) CC2 RF System 5 MW RF System for CM1 Nagaitsev

8. Overall layout of New Muon Lab Capture Cavity 1 (CC1) Cryomodules RF Gun CC2 Gun RF System CC1 & CC2 RF 5MW RF System for Cryomodules Space for 10 MW RF System Nagaitsev

9. NML building extension • Began Design of NML Extension with CF&S Group (FESS) • Room for 6 Cryomodules (2 RF Units) • Expanded Diagnostic and AARD Test Area • Cryoplant (300W) • Possible 2-Tunnel Design to Mock-up ILC Design Nagaitsev

10. Current photo on NML Nagaitsev

11. ILC-like beam? • 3.2 nC/bunch @3 MHz, up to 3000 bunches @ 5Hz • Bunch length: 300-μm rms • Transverse emittance: not important (~5 μm) • Energy: 40-50 MeV • Need “known and frozen” beam parameters at the cryomodule entrance Nagaitsev

12. A list of some ILC tests at NML • Demonstrate stable long-term high-gradient beam operation at ILC-like bunch parameters. • Demonstrate HOM power absorption • While operating at high gradient and ILC-like beam currents, demonstrate a LLRF controls system such that the beam energy and beam phase stability meet the ILC specs. • Evaluate effects of cavity gradient spreads, dark current, cryogenic load, radiation levels with beam operation. • Measure beam kicks due to couplers, cavity tilt, quad rotations + tilt errors characterize focusing properties of SCRF cavities. • Measure vibrations of cavities and quads. • Test beam diagnostics. • Test ILC crab cavities. • Test the ILC installation procedure and tunnel layout. • May evolve into a near-final system integration test. • Test alternative designs (see P. Piot’s poster) Nagaitsev

13. “Cold” L-Band Cavity BPM • High resolution (< 1 µm), “cold” BPM located in the cryomodule. • Waveguide loaded, coupled through ceramic window slot. • Dipole- and monopole mode ports, requires no reference cavity. Nagaitsev

14. Bunch Arrival / Beam Phase courtesy F. Loehl Nagaitsev

15. NML Injector Layout Nagaitsev

16. Fermilab A0 Photoinjector The A0 photo injector will be relocated to NML in early CY2008. At present, it is used for AARD, commissioning of devices for NML and for personnel training. A0 has 2 graduate students. 13m (CC-1) Nagaitsev

17. A0-Photoinjector Instruments • Retrofit of A0-Photoinjector beam instrumentation hardware for NML: • Button-type BPM pickup stations • OTR, OTRI screen monitors, & others • Faraday cup • Bunch arrival monitor pickup Nagaitsev

18. A0-Photoinjector Instruments • Retrofit of A0-Photoinjector beam instrumentation hardware for NML: • Button-type BPM pickup stations • OTR, OTRI screen monitors, & others • Faraday cup • Bunch arrival monitor pickup Nagaitsev

19. 3.9GHz Deflecting mode cavity • 5 cell Cu for emittance exchange at A0 • 9 cell Nb at NML for beamslice diagnostics, 1st pass at HOM couplers for ILC crab cavity • 2 x 9 cell Nb at ILCTA for ILC crab cavity phase control - need 67fs = 1s Nagaitsev

20. NML summary • NML is being constructed to address the ILC S2 R&D list, to test ILC baseline and alternative components, and to conduct AARD. • The A0 photoinjector will be part of the NML facility • Progress is resource limited • FY07: 4.9M$ (M&S direct), 40 FTE’s • FY08: anticipate similar resources • Collaborations: • SLAC will supply RF distribution system. May be a model for Project X. • ANL, DESY, KEK, INFN • Already have 2 graduate students in accelerator physics working on NML design. • AARD program is still developing • Had a workshop in Nov 2006 to “gauge” outside interest • See Piot’s poster for details. Nagaitsev