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

2. 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

3. SLAC involvement at TTF & ATF
SLAC invested 1 FTE on ATF projects 1997 (first extracted beam) ~ ~ 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

4. 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

5. 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

6. 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

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

8. 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

9. Installation at TTF2

10. 9 cell cavity, coupler and mode diagram

11. 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

12. TTF2 ‘ACC5’ centers

13. 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

14. 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

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

16. 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

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

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

19. 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

20. 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

21. 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

22. 7 ‘y’ BPMs: 3 upgraded & 4 original
Stored Beam – 10 minute time scale; ATF lifetime ~ few minutes
~2 mA
time

23. 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.

24. 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

25. 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

26. 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