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22ndnd ILC Accelerator Workshop ILC Accelerator Workshop(Personal Impressions of a Beam Instrumentalist)(Personal Impressions of a Beam Instrumentalist)
Manfred WendtSept. 7, 2005
Seminar on Beam Instrumentation Techniques and Technology
http://alcpg2005.colorado.edu/
Organization and StatisticsOrganization and Statistics
Working Fields:• Detector• Physics• Accelerator (2nd ILC Accelerator Workshop)• Education and Outreach
2. Beam and luminosity parameters?3. SCC “starting” gradient and upgrade path?4. 1 or 2 IR’s?5. 1 or 2 tunnels, deep or shallow?6. DR size and shape?7. e+ source: conv., undulator, compton?...29. How many diagnostic sections in the linac?33. MPS design?35. Use structure (HOM) BPM’s?43. Re-entrant or cavity BPM’s for the main linac?
Global Group 2:Global Group 2:Instrumentation & ControlsInstrumentation & Controls
Conveners:Marc Ross (SLAC), Hans Braun (CERN), Junji Urakawa (KEK)
Presentations:• S-Band Cavity BPM for ILC Linac, Zenghai Li• Cold Linac BPM’s, Manfred Wendt• Cold BPM Options, Olivier Napoly• Cold Re-entrant BPM, Claire Simon• ILC Cavity BPM’s, Steve Smith• ILC Laserwires, Grahame Blair• Survey and Alignment of ILC, Armin Reichold• Beam Based Feedback Systems, Phil Burrows• High Availability Electronics & Standards for ILC, Ray Larsen• Stabilization of the Final Focus, David Urner
Beam Position MonitorsBeam Position Monitors
Cold Linac BPM’s:
• 2 x 400 dedicated re-entrant cavity or CM-free cavity BPM’s
•2 x 10000 HOM (structure) monitors for beam displacement (???)
2 BPM stripline IP feedback 150…300 ns 1 um hor., vert.nb x 2 wd / 200 ms
1 status wd / 200 ms
800 BPM button Damping Rings 100 kHz / 2 kHz 0.5…1 um hor., vert., int.ca. 3 x wd / 500 us
1 status wd / 200 ms
6 BPM cavity, stripline DR feedback 3…20 ns < 0.5 um hor., vert. nb x 2 wd / trev1 status wd / 200 ms
100 BPM buttonMPS (everywhere) 10 us 50 um hor., vert., int.
nb x 3 wd / 200 ms
1 status wd / 200 ms
> 100 BLMionization chamber
MPS (everywhere) beam loss 1 wd / 200 ms
1 status wd / 200 ms
20000 BPM HOM Main Linacs 1 ms < 1 umbeam displacement 1 wd / 200 ms
1 status wd / 200 ms
50 BCM toroid everywhere 3…20 ns 0.5 % intensitynb x 1 wd / 200 ms
1 status wd / 200 ms
4 BCMwall current monitor Injector & BC 780 ps 1 % intensity
nbt x 1 wd / 200 ms
1 status wd / 200 ms
50Beam Phase ring electrode? everywhere
0.1 degree @ 1.3 GHz bunch phase
nb x 1 wd / 200 ms
1 status wd / 200 ms
Personal ImpressionsPersonal Impressions
• Many beam instrumentation collaborations in progress:– SLAC, KEK, LLNL, LBL, …: nanoBPM’s at ATF– SLAC, DESY: HOM-BPM at TTF– CEA-Saclay, DESY: Re-entrant BPM at TTF– SLAC, DESY: LOLA long. bunch profile at TTF– SLAC, Uni London (QM): Fast IP feedback at the SLAC Linac– Uni London (RH), JAI, DESY: Laserwire trans. profile at PETRA
• Very good working atmosphere!• Technology choice (1.3 GHz SC Cavities) accepted!• SLAC seems to me very active(!), not only in the field of