1. Mostly by Gwyn Williams and the JLab Team, Presented by D. Douglas Working Group 4 Diagnostics & Synchronization Requirements Where we are and what needs work… Kevin Jordan Jefferson Lab, Newport News VA

2. Charge for working group 4 Review what works & why –What good & bad decisions have been made Identify new experiments that will fill gaps –And get them done before next workshop! Injector requirements Linac requirements Operations perspective Open Discussion

3. Review of State of the Art Transverse measurements –Synchrotron light –What OTR material is the correct choice When will it burn up? –What is the correct choice in BPMs? Longitudinal Measurements –Martin-Puplett interferometer, from CTR or OTR –E/O Sampling – coming of age? Beam Halo – How do you define it? Control it? Current/Charge Energy/Energy Spread Timing & Synchonization

4. JLab Energy Recovered Linac (4GLS) facility schematic E = 120 MeV 135 pC pulses up to 75 MHz 20/120/1 microJ/pulse in UV/IR/THz 250 nm – 14 microns, 0.1 – 5 THz

5. How do we solve the challenges? The Beam is NOT Gaussian! –How can the diagnostics give better information to models Halo is and will continue to be a problem –What experiments can be done now? Operations perspective –Start with written procedures Injector requirements –Proper set-up & monitoring (we still have drifts!) Linac requirements Synchronization requirements Open Discussion

6. Working Group Sessions (DRAFT) Session 1 - (Joint with WG2) Optics Issues for Ongoing ERL Projects (Tue 09:00 - 13:00) –09:00 (15 +15q)Optics Design of 4GLSHywel Owen –09:30 (15 +15q)Lattice and Optics Design of the Test ERL in JapanShogo Sakanaka –10:00 (15 +15q)Concepts, simulation, and performance for an energy recovery linac upgrade of the Advanced Photon SourceMichael Borland –10:30-11:00Coffee –11:00 (15 +15q)Analysis and mitigation of Touschek scattering effects for an energy recovery linac upgrade of the Advanced Photon SourceMichael Borland –11:30 (15 +15q)Optics Issues for ERL FELs?T.B.D. –12:00 (15 +15q)Optics Issues for Magnetised Beams?T.B.D. Session 2 - Beam Instrumentation and Beam Loss (Tuesday 14:00-17:30) –14:00 (25+5q)Beam Instrumentation at the Jefferson Lab FEL K Jordan –14:30 (25+5q)Beam Instrumentation for the KEK ERL Test Facility Makoto Tobiyama –15:00 (25+5q)Commissioning issues, concerns & solution discussionAll –15:30-16:00Coffee 16:00 –(25+5q)Beam Loss Issues for an ERL Upgrade to APSCY Yao –16:30 (25+5q)Beam Loss & Passive and active machine protection systemsAll

7. WG 4 Cont. Session 3 - Requirements, Procedures and Commissioning (Wednesday 09:00-13:00) –09:00Requirements & ProceduresAll –10:30-11:00Coffee –11:00Commissioning thoughts & test standsAll Session 4 - Synchronization (Wednesday 14:00-17:30) –14:00 (25+5q)Progress in high precision timing and synchronization at LBNLSteve Lidia –14:30Synchronization & Timing discussionAll –15:30-16:00Coffee –16:00Synchronization & Timing discussionAll Session 5 - Beam Measurements (Thursday 09:00-13:00) –09:00Transverse orbit and beam profile measurementsT.B.D. –Multi - pass beam position measurementsT.B.D. –10:30-11:00Coffee –11:00Longitudinal beam measurementsT.B.D. –Beam-based machine diagnosis and feedback systemsT.B.D.