NLCTA Operations and Maintenance

1
NLCTA Operations and Maintenance

• NLCTA has been off since October 11, 2004.
• Our restart plan (see NLCTA safety web) was
  submitted ? Directorate Friday, March 25
• It includes ISMS for the group
• All ESB activities are coordinated in a daily
  730 AM meeting
• Operation of the CERN structure (recently
  installed) and vacuum tests of the X-band
  structures will resume as soon as the restart
  validation is complete
• This will be hard (now underway at MCC)
• Maintenance work has been focused on safety items
• Electrical labeling
• Ladders
• Posting

2
E 163

• E 163 is the laser-plasma wake experiment
  spearheaded by Bob Siemann
• This is the largest on-going effort in ESB at
  present
• An ultra-short pulse RF photocathode gun will be
  installed in the next few weeks.
• T-gun will be removed and mothballed
• 1 GigaW class laser installation now underway
• Beam from the gun in the next few months
• Users welcome, as always.
• NLCTA Goals 2005 Safety, ISMS, Safety, ISMS,
  Safety

3
ATF

• Program
• Damping Ring Beam dynamics studies
• Extraction line Instrumentation
• Preparation for ATF2
• Kicker Development
• Goals
• 1 pm-rad e_y sub micron extracted beam stability
• Extracted channel coupling correction (prevent 3x
  y emittance growth)
• Orbit response / ring coupling residual
  vertical dispersion
• Collective effects study (CSR / FBII)
• Wiggler effects

4
Instrumentation

• Cavity BPMs lt 10 nm resolution (1e-6 BPM
  radius), 100 nm long term offset / gain control
  (energy spectrometer) ? UK
• ATF-2 cavity BPM electronics (US/Japan)
• Laserwire 1 um scans, fast multi-bunch scanning,
  1 resolution prototype ? UK
• Optical stabilization 10 20 nm intra-beamline
  component stabilization at DC alignment tests ?
  UK
• Fast feedback (FONT) extremely low latency
  feedback digital feedback prototype ? UK
• Coherent Synchrotron Radiation (DR) ? incoming
  Sokendai graduate student/KEK
• Ring BPM upgrade reduce resolution from 34 to
  0.2 um (funded through US/Japan)

5
US/UK/KEK ATF team

• By institutional nationality
• 12 Japan, 12 UK, 4 US
• ( part of the group)

6
TTF

• Program Learn how to design, build and run a
  cryogenic linac
• LOLA transverse deflecting structure crab
  to measure 10 micron bunch structure accurately
  at 400 MeV
• Installed 09.03 and commissioned w/o beam 01.04
• Goals 2005
• Full power commissioning (20 MW)
• Synchronization to ltlt 1 ps
• Multi-stage compressor optimization
• Software, controls and phase stabilization
  systems
• LOLA is now (02.05) producing images at ½ power
• 11.04 trip failed due to poor understanding/manage
  ment of synchronization system
• Collaboration with DESY funded by DESY through
  FEL RD agreement (02).

7
TTF (2)

• Cavity higher order mode beam monitoring
• Goals 2005
• measure beam position using a few modes to 1
  um resolution
• Test cryomodule internal construction process
  with differential accuracy 100 um, using a
  family of modes
• Analysis of cavity fabrication errors using HOM
• Show that HOM can be used as BPMs for the XFEL /
  LC with excellent performance
• Possible cost reduction / increased precision for
  LC linac instrumentation
• Initial results (11.04 15 um resolution with
  single mode pair)
• Scaled performance 15 um / 70000 um is good
  first study result (compare with FFTB best 1 um
  / 24000)

8
Kicker Replacement

• ATF extraction kicker pair replacement with
  SLAC NDR-style system
• Purpose
• Reduce pressure in ring (avg by 2x)
• More stable kick similar to installed ATF
  injection kicker
• Extend pulse length to 300 ns for ILC bunch
  spacing-related studies
• Goal 2005
• Install, test and commission 2 used SLC kickers
  with a full SLC NDR extractor system
• Ready for ATF operation 24.10.2005
• Modified to run 2 kickers in parallel as needed
  with the double kicker compensation scheme
• Modified to support 5 times longer pulse

9
Kicker Replacement (2)

• Two kicker magnets found subsequently released
  by Accelerator Department
• (deemed unusable for PEP)
• Were used and removed in early-mid 1990s
• Tested, now in MFD for mod.
• (the kicker system is unforgiving of errors and
  must be treated with respect and care)
• Test pulser (B015) released from AD and now in
  mod to drive 2 magnets and support 300 ns pulse
• Stand-down has slowed us a bit testing to begin
  in a few weeks.
• Kicker system HV safety requires a few new
  procedures
• This project is entirely funded through US/Japan
• (as was injector installation in 12.1996)

10
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

11
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 lt100 um
• HER BBA resulted in significant Luminosity
  improvement through dispersion correction
• Ring BBA is extremely important for ILC DR / ATF