1. Overview of Beam Diagnostics from the Advanced Accelerator Concepts Workshop (AAC06) Vic Scarpine Instrumentation Meeting 20 Sept 2006

2. V. Scarpine, Inst. Meeting2

3. 20 Sept 2006V. Scarpine, Inst. Meeting3 Outline: –Brief description of working groups –Overview of beam diagnostic talk mostly from working group #5 Out of ~170 participants only 3 were from Fermilab (not counting A0/Nicadd) Myself, Shiltsev and Yoon Disclaimer – Any confusion, mis-information, half- baked explanations are solely the fault of the speaker. Any interest in presented topics should be followed up thoroughly by audience members (or else you get what you deserve).

4. 20 Sept 2006V. Scarpine, Inst. Meeting4 Working Groups WG1 - Computational Accelerator Physics WG2 - High-Gradient Structures WG3 - High Energy Density Physics and Exotic Acceleration Schemes WG4 – e-Beam Driven Accelerators WG5 – Beam Generation, Monitoring, and Control WG6 – Laser Plasma Acceleration Group WG7 - EM Structure Based Accelerators –Vladimir Shiltsev has give a highlights talk at a previous Tuesday accelerator seminar on the accelerator topics from AAC06 (in Doc DB)

5. 20 Sept 2006V. Scarpine, Inst. Meeting5 WG5 – Beam Generation, Monitoring, and Control Mission Statement: The working group "beam quality" will concentrate on three aspects of advanced accelerators: (1) the production of high quality beams with "conventional" sources, (2) the characterization and control of high quality beams, and (3) synchronization with external systems. The ultimate goal of a diagnostic is to characterize the beam properties in the 6-dimensional phase space, ideally providing the beam distribution. Diagnostics are also used as inputs for feedback system aimed to regulate one of the beam properties (e.g. energy, time of arrival, transverse position, etc.), typically based on a zeroth-moment (e.g. energy, arrival time, transverse position) or first-moment (e.g. energy spread, bunch length, spot size) measurement. Finally it is now common to require an external source (e.g. another beam source, external laser, synchrotron radiation pulse, etc.) to be synchronized with the beam. For instance the synchronization at the sub-picosecond level is a challenging problem needed for certain pump-probe experiment or diagnostics (e.g. electro-optical sampling for bunchlength measurement).

6. 20 Sept 2006V. Scarpine, Inst. Meeting6 Typical Electron Machine Diagnostics? Heavy on the optical techniques Similar to A0 diagnostics Future for us in ILC-land?

7. 20 Sept 2006V. Scarpine, Inst. Meeting7 Final Focus Test Beam at SLAC using interferometry to measure beam size

8. 20 Sept 2006V. Scarpine, Inst. Meeting8 Ultrafast Diagnostic Techniques Used In STELLA-LW Experiment - W. D. Kimura - Translating interferometer mirror yields autocorrelation - Analysis of autocorrelation signal gives information about bunch

9. 20 Sept 2006V. Scarpine, Inst. Meeting9 Ultrafast Diagnostic Techniques Used In STELLA-LW Experiment - W. D. Kimura

10. 20 Sept 2006V. Scarpine, Inst. Meeting10 Measurements of Longitudinal Electron Bunch Shape With Coherent Transition Radiation - Daniel Mihalcea, NIU+FNAL

11. 20 Sept 2006V. Scarpine, Inst. Meeting11 Coherent Transition and Smith- Purcell Radiation Experiments on the HRC MIT 17 GHz Linac - Roark A. Marsh, MIT

12. 20 Sept 2006V. Scarpine, Inst. Meeting12 From Beam Diagnostics Summary Page Longitudinal measurements are maturing –CTR is almost “routine” for bunch length –Advanced methods for profile reconstruction with CTR, phase-space projection with deflector cavities + dipoles –Working towards “single-shot” CTR-based meas. Transverse measurements –Tomographic reconstruction is now widely used –New BPM designs for position and moment extraction –Ideas for full phase-space projections to a screen

13. 20 Sept 2006V. Scarpine, Inst. Meeting13 Some Upcoming Non-Intercepting Techniques Quad cavity BPMs to extract beam moments, measure rms emittance Optical diffraction radiation to monitor high-energy beam size Metallic post BPMs Photonic bandgap structures Coherent edge radiation Questions: wakefields? beam-to-structure clearance? (Not discussed in WG5: laser wire, EO techniques)

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15. 20 Sept 2006V. Scarpine, Inst. Meeting15 S. Banna, L. Ludwig and L. Schächter, NIMA, 555, p. 101 (2005). Power Spectrum for 6x6 Posts Array For zero offset the radiation pattern is symmetric. The intensity of the backward radiation increases with the increase of the offset. The radiation pattern is highly directional and has narrow angular range Array of Metallic Posts as a BPM Pick-Up

16. 20 Sept 2006V. Scarpine, Inst. Meeting16 Alex Lumpkin, APS, Argonne

17. 20 Sept 2006V. Scarpine, Inst. Meeting17 Alex Lumpkin, APS, Argonne

18. 20 Sept 2006V. Scarpine, Inst. Meeting18 Alex Lumpkin, APS, Argonne

19. 20 Sept 2006V. Scarpine, Inst. Meeting19 Bunch compression and coherent radiation measurements experiment at UCLA-ATF chicane- J. Rosenzweig, UCLA Autocorrelation of CTR used to measure bunch length. CTR generated by foil.

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23. 20 Sept 2006V. Scarpine, Inst. Meeting23 Phase Space Mapping and Emittance Measurement Of Intense Particle Beams Using A Tomography Technique Measure the beam phase space by combining a simple quadrupole- scan with tomography Diktys Stratakis University of Maryland

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25. 20 Sept 2006V. Scarpine, Inst. Meeting25 Possibilities... Lots of interesting diagnostic techniques for the electron world R&D available at FNAL? –A0 lab (and it’s future incarnation) Electro-optic world dominate in e- accelerators and have potential for unique and non-interacting techniques