ILC-Americas Regional Team Review R&D at international test facilities TTF, ATF, ATF2 (5.5, 5.10.1 & others) 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

ILC-Americas Regional Team Review Background In early 1990’s, linear collider scientists developed a global RD facility plan. 15 yrs later, ILC has 2 dedicated (to some degree) mature test beam facilities Tesla Test Facility at DESY (SCRF) Accelerator Test Facility at KEK (Damping ring) multi 10’s M$ investment Goals: Aggressive study of ILC accelerator science and technology Development of inter-laboratory technical partnerships these to enable good working relationships Train students; keep more senior staff focused on ‘real’ issues 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

SLAC involvement at TTF & ATF SLAC invested 1 FTE on ATF projects 1997 (first extracted beam) ~ 2004. ~ 2 FTE since 2004 Focus on beam dynamics and instrumentation Beam – based alignment, system commissioning and emittance tuning Strong partner with a broad range of contributions Significant benefit for both labs MoU 1996, renewed 2004. SLAC investment in TTF starting in 2001 1/3 FTE average (mostly 2 large projects) Instrumentation, RF control studies, SCRF operations MoU 2002, addendum 2005 In both cases, the partner lab has helped with funding

SLAC Leadership at TTF & ATF Logistics Up to 30 visitors at ATF in a given 2 week ‘operations cycle’ Project management on schedule is vital Coordination Machine capabilities, assignment of responsibilities Infrastructure preparation Communication Analysis Performance evaluation, improvements list… An effective way to build lasting relationships based on mutual trust and respect Both ATF/TTF ILC efforts are resource-limited ATF operation ~20 11-shift weeks/year TTF operation overwhelmingly dominated by VUV-FEL & operational concerns 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

TTF, ATF, ATF2 Collaborations (n,m numbers indicate staffing ‘names’; read: n total of whom m are either grad/post-grad students) TTF: Bunch length monitoring DESY, German U, SLAC (6,1) SCRF Higher-Order-Mode instrumentation DESY, Saclay, Fermilab, SLAC, (KEK) (8,2) ATF Cavity BPM KEK, LLNL, LBNL/UCB, Cambridge, Cornell, UCL, RHUL, SLAC, Japanese U (14, 5) Ring BPM UCB, SSRL/SLAC (6) 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

Collaborations – continued ATF Feedback (FONT) (UK Leadership) Oxford, Daresbury, SLAC (6, 2) Laserwire (UK Leadship) RHUL, Oxford, SLAC, KEK (10,3) Kicker system development DESY, KEK, LLNL, LBNL, Cornell, UBC, INFN, SLAC (?) Multibunch feedback SLAC, KEK, INFN (6) Coherent Synchrotron Radiation LBNL (3,1) ATF2 ATF2 BPM’s SLAC, KEK, PAL (7,2) For the most part not individually formally arranged Falls under ATF Int’l Coll. MoU (2006), ~ 20 institutions Roughly 70 names (16 students) from all 3 regions

BPM Instrumentation – FY06 summary 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

TTF2 HOM – based Beam Instrumentation (3.9.1) There are 18 low-lying dipole modes in the TESLA 9 cell cavity 4 couple strongly to the beam (~1750 MHz) SLAC/DESY/Saclay installed and commissioned a single channel (one mode) receiver system on each of the TTF HOM couplers (80 each) in late 2005. GOAL: Find relative centers of cavities in cryomodule Integrate with the TTF BPM system – roughly tripling the number of BPMs 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

Installation at TTF2

9 cell cavity, coupler and mode diagram

TTF2 HOM monitor (3.9.1): Status 06 Budget: 1.4 FTE 168 K$ M/S 06 costed: 0.8 FTE 50 K$ M/S (much work completed in late 05) Spending expected for remainder of 06: 0.2 FTE 25 K$ M/S Two commissioning runs done: 11/05 and 3/06 Schedule determined by VUV-FEL master Next run(s): 5/06 and 8/06 Preliminary alignment results distributed(?) BPM integration in May and August 07 HOM studies on cavity fab, mode differences, beam phase (LLRF) – post doctoral study 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

TTF2 ‘ACC5’ centers

Cavity BPM Studies (3.7.1, 3.10.2, 3.10.3 part of 5.5.1) Classification indicates broad range of application Includes MDI (Machine Detector Interface) and ATF2 (Beam Delivery) Through use of dipole modes of monolithic (Cu) resonators, cavity BPM’s have far better resolution than striplines or buttons Effective monopole suppression Many practical questions 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

Cavity BPM RD Goal: Prove viability of cavity BPMs for ILC Resolution, systematic errors, calibration process 2 sets of triplets installed at ATF ‘full blown’ mover calibration, including angles Excellent ~20 nm resolution Dec 04/March 05 runs (world record) Carbon fiber metrology tube (LLNL) mounted in Jan 06 Monitor thermal space frame internal motion ATF2: ~35 cavities now in production in Korea System testing in FY07 100 nm resolution 1um systematics Excellent system test r

ILC-Americas Regional Team Review Cavity BPM triplet space frame – KEK/ATF 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

ILC-Americas Regional Team Review Calibrate Move one BPM at a time with movers Extract BPM phase, scale, offset as well as beam motion by linear regression of BPM reading against mover + all other BPM readings. +/- 20 um range of motion 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC 250 pulse sequence

ILC-Americas Regional Team Review Move BPM in 1 um Steps 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

Cavity BPM Studies (3.10.3, 3.10.7 part of 5.5.1): Budget & Completion

UCB/Kolomensky 3.10.7: (ATF and ESA BPM studies) NanoBPMs at ATF/ATF2 Focus on ultimate precision, down to ~1 nm 20 nm achieved Study systematics, calibration, down to this level Currently scheduled for two runs in 2006 Future: ATF2 (Q-BPMs, designed at KEK, electronics from SLAC) SLAC-ESA experiments Focus on energy spectrometry applications moderate resolution ~0.1-1 m, high dynamic range high accuracy/stability Test linac BPM prototypes (SLAC design) Understand implications for calibration, waveform processing Two two-week runs in 2006 Plans for 2007 and beyond being formulated (LCLS era) 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

3.10.2 – ATF2 Cavity BPM electronics: Status 06 Budget: 1.4 FTE 168K$ M/S 06 costed: 0.2 FTE 5K$ M/S Spending expected for remainder of 06: 0.8 FTE 125 K$ M/S First prototype bench tests good Second prototype in production Testing at ATF April 10-24 Production run complete - full delivery June 5. Commissioning & system testing next year 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

ATF Ring BPM electronics (3.5.2) Goal: Upgrade ATF ring BPM electronics for improved resolution (100nm), stability (1um), calibration (1e-4) Should allow beam tuning for 1pm-rad vertical emittance Multi-pass system  this is basic advantage Use existing storage ring technology – fast digital receivers (e.g. EchoTeck) SLS, Fermilab, APS, SPEAR Total replacement cost dominated by receiver electronics cost ~400K Primary effort in designing and testing front end and infrastructure

7 ‘y’ BPMs: 3 upgraded & 4 original Stored Beam – 10 minute time scale; ATF lifetime ~ few minutes ~2 mA time

time ~ factor 20 improvement  long term stability checks to be done Same lifetime data: 10 minute total interval (factor 3 in intensity) Residual after removing ~minute scale oscillations Two lines are +/- 500 nm apart Residual vertical (over total time) ~ 500 nm.

Ring Electronics (3.5.2): Status 06 Budget: 1.7 FTE 198 K$ M/S 06 costed: 0.3 FTE 101 K$ M/S Spending expected for remainder of 06: 0.8 FTE 15 K$ M/S 06  borrowed 8 digitizers from SPEAR (16 BPMS / 96 total) Receiver produced (20 BPM’s) Cal system in design Initial operation Feb 2006 Second tests in June Fermilab will join the group, and bring a full crate system for testing This is Fermilab’s first direct contribution to ATF Partial system remains in use at KEK 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

ILC-Americas Regional Team Review FY 07 ‘Initiatives’ ATF Coupled bunch instability fast feedback (Fox/Teytelman) ATF2 IP and large bore cavity BPM testing and electronics ATF2 magnet movers (from FFTB) SCRF HOM absolute beam phase monitor To be integrated with TTF2 LLRF system Single pass bunch length monitor LCLS / ESA 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC

ILC-Americas Regional Team Review FY07 ‘Initiatives’ (2) ATF2 testing, commissioning and pre-operations FNAL Test facility Instrumentation and LLRF Controls Collaboration ILC Beam Test Facility Coordination Group Beam testing is critical for mitigating technical risk associated with ILC. ATF and TTF also SNS, ‘A0’, various storage rings and ESA. lack of dedicated hosting staff that have the time and expertise to deal with potential users. An important task for the RD board is the assessment of beam testing time required for each RD task a small group needed to match RD efforts with appropriate opportunities. 4/5/2006 ILC-Americas Regional Team Review Marc Ross - SLAC