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RF & Linac Design Accelerator Design Program Update

RF & Linac Design Accelerator Design Program Update. Chris Adolphsen. Department Programs. International Linear Collider (ILC) All ILC areas except for ATF2 (APE and Test Facilities) FNAL Project X L-band CW (650 MHz) and Pulse rf (1.3 GHz) sources, … LARP Rotatable Collimator

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RF & Linac Design Accelerator Design Program Update

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  1. RF & Linac Design Accelerator Design Program Update Chris Adolphsen

  2. Department Programs • International Linear Collider (ILC) • All ILC areas except for ATF2 (APE and Test Facilities) • FNAL Project X • L-band CW (650 MHz) and Pulse rf (1.3 GHz) sources, … • LARP • Rotatable Collimator • UA9 Crystal Collimation • … • SuperB • IR Design • Ring RF • …. • X-band • CLIC Structure Tests • X-band Gun Development • X-band Linac Driven Light Sources (MEGa-ray, MaRIE, …) • …. • Support for FACET, LCLS, Controls Upgrade, …

  3. Klystron Cluster Scheme Tests Resonantly power a 0.5 m diameter, pressurized (1 atm N2), 10 m long aluminum pipe to 300 MW TE01 mode field equivalent in 1 ms pulses

  4. ‘Big Pipe’ Operation 550 KW input power yields 300 MW equivalent surface fields in the pipe - see bkd every ~ 15 hours, maybe from CTO or upstream – rate seems very pressure dependent Acoustic Sensor Breakdown Localization 1 2 CTO Time of Position 2 markers (T1,T2) are ~ 1 ms later than those from Position 1, which suggest events are much closer to Position 1 (5 m / 5100 m/s ~ 1 ms) T1 T2

  5. Next: 160 m Resonate Ring

  6. Status of ILC e- Source Laser System Development • Two similar laser systems are being developed: • SLAC design • SBIR laser system (KM Labs) • Both systems share similar challenges • CW amplifier pump lasers • KM Labs system has been operational at 1.5 MHz at KM Labs facility  inspected in October 2010 • Delivery in December 2010 • KM Labs and SLAC systems are now in the process of installation at SLAC’s ILC ITF • After KM lasers running at 1.5 MHz, will do a gun test and then augment the PI pumps with the Coherent lasers to bring the KM system up to 3 MHz

  7. KM Labs System Installation Top Left: JohnS at KM Labs in Boulder, CO in October Top Right: the laser being brought into B006 in December Bottom: the laser on the table in Rm 107, B006 wherein we have tested the Photonics Industries (PI) green pump lasers. One of these work, one of these has low output.

  8. Gun Development at JLab Inverted Insulator Cathode JLab's Inverted gun design Anode Feedthrough Conditioned to 150kV without observed field emission Anode NEGs and Ground Screen

  9. ILC DR Electron Cloud Working Group Tasks & Status Working Group coordinated by SLAC (M.Pivi). March 2010 October 2010 Participating Institutions:ANL, Cornell, INFN, KEK, LBNL, SLAC Under Evaluation

  10. Electron Cloud Mitigation Options After extended operation Grooves on Cu Grooves w/TiN coating Manufacturing Techniques& Quality Reliable Feedthroughs Clearing Electrode CESRTA Stable Structures Clearing Electrodes KEKB

  11. ECLOUD10 Workshop Quadrupole Region Evaluation for the 3.2km DR for Possible High Current Operation Lanfa Need SEY~1 or better in quadrupoles with short bunch spacings CLOUDLAND simulations (L.Wang, SLAC) Need to understand antechamber role

  12. MDI Work in ProgressHall Design, Detector & Platform Vibration Analysis, “R20” Package w/ QD0 mover system, Frequency Scanning Interferometry Alignment

  13. First Simulations of a Network of Launch Points and Retroreflectors for QD0K. Riles – U. Michigan

  14. Vibration Measurement System to Support ILC MDI R&D: Testing on the SLD Detector • Andrei Seryi’s old vibration measurement system has been resuscitated • Custom battery-operated preamps have been built • System noise level is very low: ~0.25 nm RMS (integrated power > 1 Hz)

  15. SLAC Rotatable Collimator for LHC RC-1 Jaw (Glidcop) RF foils carry image current and shields Rot. Mech. Tank geometry allows a 60mm facet-to-facet gap in fully retracted Jaw position BPM assemblies at each end are fiducialized to Collimator RC-0 Jaw (copper) Ratchet Gear Drive LHC IR7 Style BPM Buttons 4 per end Base Plate Flex Support Ferrite could mount to Base Plate facing Jaw facet Drive Mechanism

  16. Status In Q1 FY11, mechanical work included the rebuild of the RF rotation mechanism on one of the jaws and the final reassembly/rebuild of the drives with W-S2 coated bearings. The new design was tested to x5 anticipated torque required for rotation. The four bellows were vacuum fired and welded on. Leak checking showed 9-scale vacuum.

  17. Current Near Term R&D Plan • Ship first rotatable collimator prototype to CERN ASAP • Mechanical, vacuum & impedance tests by CERN personnel • Installation in SPS during technical stop of LHC • Location identified • Beam tests of prototype in SPS in early 2011 • Impedance • Operation • Robustness tests in HiRadMat Facility ~ Summer 2011: 1 MJoule per accidental beam-abort • Test extent of damage: molten & gaseous debris, hit face, adjacent face.. • Permanent shock induced deformation of jaw • Operation of rotation drive & integrity of water circuits after impact(s)

  18. SuperB Interaction Region Developed a scheme for solenoid compensation that involves rotating the PMs as well as cancelling the detector field as much as possible Recently, an orbit and skew correction scheme was developed to enable the machine to run with the detector field off using the same compensation hardware m

  19. Non-RF Bunch Linearizer for a All-X-Band Linac Yipeng Sun

  20. Simulations for 250 pC Bunches BC1:over-compress BC2:under-compress Yipeng Sun

  21. Use of Truncated Gaussian Laser Profile to Reduce LCLS Emittance • Can improve LCLS projected and slice emittance 20%+ • It is supported by theoretical analysis - space charge forces are more linear in the Gaussian-cut case. • Scheduled to LCLS beam verification in late February. x/r=0.5 x/r=1.0 x/r=10 F. Zhou, P. Emma, and Z. Huang

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