3/10/2006Marc Ross - SLAC1 RDR Instrumentation – Bangalore ILC-GDE meeting, 3/10/2006 Development and specification process Operations and Beam Dynamics Challenge to interpret and balance these two sets of requirements; one mature/one not Junji Urakawa (KEK) Philip Burrows (UK)Marc Ross (SLAC)

3/10/2006Marc Ross - SLAC2 Summary presentation: See Fermilab RDR Technical system presentation: Beam position (12000), laserwire (35), imagers (35+), bunch length systems (12), beam phase(1/RF unit), special systems (?) Technical risks and general features POCs: Brachmann, Bharadwaj, Ross, Tenenbaum, Seryi, (need linac)

Where does the information come from: e- DR: Scaled, best guess e+RTMLLinac BDS:Area files 3 basic pickups: Striplines (SL) Buttons (BTN) Cavities(CAV) (RD priority) This is a big system, ~ 10 x LEP, 10 x SLC

Cavity BPM block diagram Linac / RTML/BDS Minimum length RF cabling –Local mixer system –Improved systematics Performance and strategy depend on distance to accessible electronics –(secondary tunnel / support building) Cost drivers: –Precision cables –Digitizer –Mechanical –RD ATCA

3/10/2006Marc Ross - SLAC5 Linac ‘slotted, cleanable’ test cavity (1/2 scale)

3/10/2006Marc Ross - SLAC6 Tests planned for April 2006

3/10/2006Marc Ross - SLAC7 Linac issues: Design Scale error: Dispersion-steering –‘State of the art’ requirement; understanding and demonstration required 1% accuracy requires aggressive calibration process 10% is beyond ‘typical performance’; but can be done No movers in the baseline Cavity proximity Baseline: large aperture Use of cavity Higher Order Modes - dipole & monopole –Active ‘ACD’ RD topic –Sub-micron resolution –Redundancy; cavity offsets –LLRF high accuracy beam phase input RD at ATF, ESA, TTF

TTF ACC3 Cavity HOM centers – Nov 18, 2005 Josef Frisch

TTF ACC3 Cavity HOM centers – March 7, um 400 um Josef Frisch

3/10/2006Marc Ross - SLAC10 Where does the information come from: DR 1 per ring RTMLPT talk (1/31) Linac ½ of warm sections (~ BCD recommended) BDSAS talk (2/13) Laserwire basics: 1.Laser (one can feed many IP’s) 2.Distribution 3.Deflector (scanner) 4.IP (multi-plane) 5.e/γ Separation 6.Detector

3/10/2006Marc Ross - SLAC11 Laserwire Predictors of luminosity in a segmented system –Vital ‘operational’ need Key performance requirements issues remain –Spatial dynamic range: –Usage –Parameters Infrastructure requirements need to be identified –JAI staff assigned to integration task

3/10/2006Marc Ross - SLAC12 Feedback integration Appropriate feedback ‘sensors’ (BPM’s, phase monitors) have not been designated; space has not been allocated –Correctors also needed in many cases Redundancy will be needed for critical (energy, IP phase, ring extraction) Area System feedback ‘POC’ needed