June 15, 2005Marc Ross (ILC) – Instrumentation Development ILC Instrumentation Development Marc Ross, SLAC.
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June 15, 2005Marc Ross (ILC) – Instrumentation Development ILC Instrumentation Development Marc Ross, SLAC
June 15, 2005Marc Ross (ILC) – Instrumentation Development Overview: 1)Build on experience at SLC/PEP II by: Developing instrumentation and related controls with capability directed squarely toward the needs of ILC and other next generation accelerators TRC R2/3 (focus on precision position & profile measurements – long. & transverse) Seeking out and binding worldwide expertise on critical beam monitoring and control issues (application beyond ILC) 2)Promote the use of ATF, TTF and ESA for this purpose ATF (DR, low emittance extracted beam) & TTF (SCRF, short bunch) & ESA (short bunch high E) are unique ILC test facilities 3)Bring - to students - the opportunity to work on hardware in a developmental environment Manageable projects beyond the reach of operational pressures
June 15, 2005Marc Ross (ILC) – Instrumentation Development
June 15, 2005Marc Ross (ILC) – Instrumentation Development International Collaboration 2001- 2005 DESY/SLAC Projects at TTF (TESLA Test Facility) –Gun breakdown location using ultrasound location –Precision bunch length monitor σ_z ~ 5 microns “LOLA” (FEL- 2005) –SCRF Cavity Higher Order Mode BPM – 3 um resolution (PAC- 05) KEK/SLAC/LBL Projects at ATF (Accelerator Test Facility – KEK) –Beam Based Alignment Phys. Rev. Lett. 92, 054802 (2004) Achievement of Ultralow Emittance Beam in the Accelerator Test Facility Damping Ring –Coupled bunch instability studies – based on precision CW laser-based profile monitor Many instrumentation projects...
June 15, 2005Marc Ross (ILC) – Instrumentation Development Recent developments at ATF ‘Precision’ instrumentation projects addressing BD / DR issues –Technical coordination / leadership by SLAC (also logistics) Truly global support / global interaction –KEK / Japanese Universities –UK (LCABD) –EU (EuroTeV) –SLAC –LLNL –Cornell
US/UK/KEK ATF team (March 8 2005) By institutional nationality : –12 Japan, 12 UK, 4 US (~ part of the group … 25 non-Japanese users in May 2005)
ATF Instrumentation Projects: 1.RF Cavity Beam Position Monitors –Fundamental RD aimed at RF-BPMs throughout the ILC Linac (large bore, low loss factor, high resolution) BD (large bore, high resolution) Energy spectrometer –No one has experience with large RF cavity BPM systems BPM is the most critical beam instrument (SLC, TeV, PEPII…) –Typical requirements ~ 100 nm @ 1 inch diameter ATF achieved: 15 nm for ½ inch diameter (short term) Long term stability (offset and gain) studies underway –60 nm over 2 hours achieved Thermal limit is 5 nm –Projects in process: Beam tests of 6 BPMs & development of electronics for ATF2
ATF Instrumentation Projects (2): 2.Laser-based beam profile monitors Mechanical ‘wire’ scanners will not work in ILC Build on experience at ATF (ring), SLC and FFTB Royal Holloway/Oxford lead; SLAC technical partner –1 ~ 2 micron scanner by 12/2005 1% resolution; fast scanning 3.Stabilization systems – beam feedback and other –Fast (low latency) feedback (Queen Mary) SLAC is a technical partner Tested 2005 –Optical ‘struts’ (extension of ATLAS system) developed at Oxford 10 nm stabilization over 10 m baseline with ~ hour timescale using 25 Michaelson /frequency scanning interferometers
TTF Instrumentation Projects (1) Kicker used to select single bunch out of 1MHz bunch train Deflecting cavity pulse 1 microsecond only streaks selected bunch In principal, resolution is (unstreaked spot size / maximum streak rate) Transverse deflecting structure to measure longitudinal profile
May 23, 2005Marc Ross – TTF Program Unstreaked, vs. Streaked Spots Power = 4.8MW, corresponding to 4.5fs/pixel 1 picosecond
May 23, 2005Marc Ross – TTF Program Beam without and with BC 3 (second bunch compressor) Scans at high power ~16MW 1 picosecond 13 femtosecond FWHM spike!
May 23, 2005Marc Ross – TTF Program TTF Instrumentation Projects (2) Use of SCRF cavity dipole higher order mode signals as beam position monitors –Cryomodule assembly alignment check –Beam steering and tuning at TTF HOM readout tested October 2004 & April 2005 –Proposal for 80 channel heterodyne receiver/digitizer system submitted. Discussed with DESY. Prototype development underway. Full approval needed July for November delivery. M/S largely funded by DESY/Saclay. –Four micron resolution demonstrated (single bunch). (PAC 05).
May 23, 2005Marc Ross – TTF Program Instrumentation Project Summary
June 15, 2005Marc Ross (ILC) – Instrumentation Development Coherent Synchrotron Radiation (DR) incoming Sokendai graduate student/KEK Ring BPM upgrade: reduce resolution from 3~4 to 0.2 um (funded through US/Japan) ATF-2 cavity BPM electronics (US/Japan)
May 23, 2005Marc Ross - PEP II Projects PEP II Program: Provide help as requested by SLAC Director (~late 03) (not on the agenda, but an important goal for 2004 extended into this year) Two major systems installed: LER X-ray Synchrotron Radiation monitor –Goal: measure beam size accurately in LER up to full intensity without ‘tilt’ distortion present in existing monitors –Smallest measurable beam size ~ 10 um, well below smallest expected LER sigma_y –Bunch – by – bunch beam size for EC measurements X-ray technology extremely important for ILC DR monitors
May 23, 2005Marc Ross - PEP II Projects PEP II (2) Beam Based Alignment –LER BPM offsets / misalignments in IR2 region are extreme; arcs important but… –Installed 32 shunts from SPEAR; BBA possible on 61 magnets –Installation completed 16.03.2005 –Quad string operation started 24.03.2005 Shunts tested ok Goal 2005: BBA understanding of LER BPM systematics & IR misalignments to <100 um –HER BBA resulted in significant Luminosity improvement through dispersion correction Ring BBA is extremely important for ILC DR / ATF