Charge for WG2 (Optics and Beams)
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1 Charge for WG2 (Optics and Beams) Georg H. Hoffstaetter (Cornell University / Physics) on behalf of WG2: Co-conveners: Hywel Owen, Vladimir Litvinenko CHESS & LEPP Speakers: Dan Abell, Michael Boege, Michael Borland, Dave Douglas, Alexei Fedotov, Luca Giannessi, Ryoichi Hajima, Georg Hoffstaetter, David Holder, Andrew Hutton, Andreas Kabel, Joerg Kewisch, Gennady Kulipanov, Valeri Lebedev, Steve Lidia, Vladimir Litvinenko, Lia Merminga, Bruno Muratori, Sergei Nagaitsev, Hywel Owen, Phillip Piot, Eduard Pozdeyev, James Rosenzweig, David Sagan, Masaru Sawamura, Luca Serafini, Todd Smith, Chris Tennant, Marion White 1. Goal 2. Projects & Areas of Interest 3. Highlights 4. Reports 5. Important future issues
2 Charge
3 Schedule Optics issues for ongoing ERL projects Accelerator modeling Stability issues Merger design (with WG1) BBU and cavity optics Computational aspects Sunday Monday Tuesday Wednesday
4 Optics in ongoing ERL Projects JLAB-FEL JAERI-FEL RECUPERATOR FEL ERLplus Cornell X-Ray ERL 4GLS MARS APS-ERL Arc en Ciel ecool-rhic erhic-erl ELIC } } ERL-FELs ERL-Light Light sources Nuclear Physics ERLs
5 FEL-ERL operation experiences
6 Accelerator modeling (e.g. ERL-FEL)
7 5GeV ERL Upgrade for CESR
8 Upgrade for APS Dump Injection Predictions for x-ray x properties Somewhat more optimistic than At other designs (preliminary)
9 Why X-ray ERLs? Simulated Injector Performance Takes several 10 5 simulations ε [mm-mrad] q[nc] ( /σ z [mm] 2.3 )
10 Why X-ray ERLs?
11 Stability issues (Rings)
12 Stability issues (Linacs) CEBAF with adaptive feed forward at 60, 120, and 180Hz.
13 BBU codes V x t e ( t) = Wx ( t t') d( t') I( t') dt', d x ( t) = T12 c V ( t tr ) V x ( t) = T12 e c t W x ( t t') V ( t' t r ) I( t') dt'
14 BBU measurements
15 BBU passive feedback
16 BBU stabilization
17 BBU active feedback
18 Accelerator modeling (S2E simulations)
19 Computational aspects Need for fast, open source, parallel 3D space charge codes:
20 Space charge and CSR RF-Gun + Solenoid + Drift
21 Space charge and CSR
22 Collaboration (EuroFEL) Example: European FEL design study (EuroFEL) 18 European laboratories, lead by DESY-Hamburg Collaborating on several different FEL projects
23 Collaborations Joint proceedings writing: Optics issues for ongoing ERL projects Stability issues Merger design BBU issues RF optics Space charge and CSR Push-Pull FEL Multi turn ERL issues Ion clearing (Susan Smith) (Michael Boege) (Vladimir Litvinenko) (Eduard Pozdeyev) (Phillip Piot) (Gabriele Bassi) (Andrew Hutton) (Gennady Kulipanov) (Georg Hoffstaetter)
24 Instrumentation Discussions on diagnostic necessities: a) Number and location of BPMs b) BPMs for two beams c) Number and location of beam size measurements d) Longitudinal beam profile measurements e) Longitudinal tomography f) Optic measurement procedures g) Beam based alignment procedures h) Commissioning strategies i) Emittance control j) Phase space tomography
25 Conclusion Most important things to address: Stability issues Beam loss and halos in ERLs CSR and LSC suppressing designs Completion of BBU test Experimental verification of RF optics Clarification of Multi turn ERL issues
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