Workshop on Linac Operation with Long Bunch Trains

6 Jun 2011, 09:00 → 8 Jun 2011, 18:00 Europe/Berlin

Sem. R. 2, Bldg. 3 (DESY)

John Carwardine (Argonne), Nicholas Walker (DESY), Siegfried Schreiber (DESY)

The corner stone of the TESLA superconducting linear accelerator technology is the ability to accelerate long bunch-trains at relatively high currents in pulsed operation. This workshop follows on from the first one held in February 2010. The ILC 9mA programme remains a central theme of the workshop, but in keeping with the broader issues of the challenges of operations with long bunch-trains and the spirit of the first meeting, this workshop will also focus on specific issues relevant to FLASH VUV-FEL and future European XFEL operations.

Unlike the first workshop, this meeting will be entirely plenary with no parallel working groups. The time will be divided into six thematic sessions:

1. Results and analysis from the 9mA studies
2. Toward future 9mA studies
3. Operations modes for FLASH2
4. Feedback and control of longitudinal phase space
5. Machine protection for long bunch-train operation
6. Beam-based feedback systems

Description of the scope of these themes can be found under Scientific Programme.

Group Photo #1 IMG_9909.jpg

Group Photo #2 IMG_9921.jpg

Workshop Report LBT_Workshop_Report_15Sept2011.pdf

Monday, 6 June

14:00 → 15:30 Opening Session

14:00 Welcome address

Speaker: Dr Nicholas Walker (DESY)

14:10 Scope and goals for the workshop

Speaker: John Carwardine (Argonne)

Slides Carwardine_LOLBT_Workshop_goals_talk.ppt

14:30 Long bunch train operations at FLASH

Speaker: Dr Holger Schlarb (DESY)

Slides Overview_Longpulstrain_operation_20110606.ppt

15:10 The February 2011 9mA studies in an nutshell

Speaker: Dr Nicholas Walker (DESY)

Slides feb-studies-overview.ppt

15:30 → 16:00 coffee

16:00 → 18:00 9mA studies analysis and results

16:15 Detuning compensation studies, detuning calculations

Speaker: Dr Mariusz Grecki (DESY)

Slides detuning.pdf

16:35 Results from the 'S1-Global' cryomodule tests at KEK

Speaker: Dr Shinichiro Michizono (KEK)

Slides S1G_9mAFin.ppt

16:55 Vector Sum calibration in closed loop

Speaker: Mr Sven Pfeiffer (DESY)

Slides SPpresWorkshop.pdf

17:05 Photon science with long bunch-trains

Speaker: Dr Rolf Treusch (HASYLAB at DESY)

Slides Long_Bunch_Train_Photon_Experiments_June_2011_RT.pdf

17:25 Discussion

Tuesday, 7 June

09:00 → 10:30 Feedback control of longitudinal phase space

09:00 BAM electronics & software developments

Speaker: Mr Patrick Gessler (DESY)

Slides GESSLER_BAM_ELECTRONIC_SOFTWARE_20110607.pdf

09:20 Beam based FB implementation with SimconDSP and uTCA LLRF controllers

Speaker: Mr Wojciech Jalmuzna (DESY)

Slides Jalmuzna_LOLBT_Workshop.pdf

09:40 Results on BAM studies

Speaker: Marie Bock (DESY)

Slides 2011-06-07_BAM_study_results.pdf

vid1 2011-02-22T173001_114266events_BAM1_histogramme.avi

vid2 2011-02-22T173001_114266events_BAM4_histogramme.avi

10:00 Beam stabilization with MIMO controller and BBF

Speaker: Christian Schmidt (DESY)

Slides BBF_LBT.pdf

10:20 Discussion

10:30 → 11:00 coffee

11:00 → 12:30 Feedback control of longitudinal phase space

11:00 LLRF Front-end server implementation of BBF

Speaker: Olaf Hensler (DESY)

Slides 9mA_2011-Workshop-O.Hensler.pdf

11:20 Slow DAQ based long. feedback architecture

Speaker: Mr Raimund Kammering (Deutsches Elektronen-Synchrotron Hamburg)

Slides slow_long_fb.ppt

11:40 Stability of photoinjector and impact of BBO crystal

Speaker: Sebastian Schulz (DESY)

Slides Schulz_Slides_FINAL.pdf

12:00 Discussion

12:30 → 14:00 lunch

14:00 → 15:30 9mA studies analysis and results

14:00 Energy regulation performance with beam loading

Speaker: Mr Christian Schmidt (DESY)

Slides BBF_LBT_Energy.pdf

14:15 Investigation of individual cavity field stability and slopes on vector sum regulation

Speaker: Wojciech Cichalewski (TUL-DMCS)

Slides WS_LBTO_Cichalewski.pdf

14:30 Gradient flatness studies results and analysis

Speaker: Dr Gustavo Cancelo (Fermilab)

Slides PkQl_studies_at_FLASH_-_2nd_workshop_DESY_2011.pptx

14:50 Analysis of piezo sensor signals and their correlation to detuning

Speaker: John Carwardine (Argonne)

Slides Carwardine_monitoring_piezos_LOLBT2011_6June2011.ppt

15:05 Discussion

15:30 → 16:00 coffee

16:00 → 17:30 9mA future studies

16:00 Priorities and desired results from the next 9mA studies

Speaker: John Carwardine (Argonne)

Slides Carwardine_Future9mAstudies_intro.ppt

16:15 Planned LLRF upgrades

Speaker: Frank Ludwig (DESY)

Slides Linac_Operation_LOng_Bunch_Trains_06_06_11_FLudwig_short.pdf

16:35 Parameter space for Pk/Ql studies at 6mA and high gradients

Speaker: Dr Gustavo Cancelo (Fermilab)

Slides Parameter_space_for_Pk.pptx

16:55 Proposed RTML studies at FLASH

Speaker: Nikolay Solyak (Fermilab)

Slides Proposed_RTML_studies_at_FLASH.pdf

17:10 Discussion

18:30 → 21:30 Workshop Dinner

Wednesday, 8 June

09:00 → 10:30 Machine Protection

09:00 XFEL (FLASH2) MPS system

Speaker: Dirk Noelle (DESY)

Slides XFEL_MPS.ppt

09:20 FLASH Beam Loss Monitor System

Speaker: Dr Alexander Kaukher (DESY)

Slides LOLBT_A.Kaukher.pdf

09:40 FLASH MPS Philosophy

Speaker: Dr Siegfried Schreiber (DESY)

Slides MPS-schreiber-final.pptx

10:00 Discussion

10:30 → 11:00 coffee

11:00 → 12:30 Concurrent operation modes for FLASH1 and FLASH2 Beamlines

11:00 Overview of the FLASH2 Project

Speaker: Bart Faatz (DESY)

Slides FLASH_II_9mA_20110608_v1.ppt

11:15 LLRF options and tests

Speaker: Dr Valeri Ayvazyan (DESY)

Slides

• LLRF_FLASH2_movie_1.avi
• LLRF_FLASH2_movie_2.avi
• LLRF_FLASH2.ppt

11:35 Timing issues

Speaker: Mr Patrick Gessler (DESY)

Slides GESSLER_TIMING_ISSUES_20110608.pdf

11:55 Kicker stability and flatness measurements

Speaker: Frank Obier (DESY)

Slides Kicker_stability_und_flatness_measurments.ppt

12:10 Discussion

12:30 → 14:00 lunch

14:15 → 15:30 9mA future studies

14:15 Reaching higher average gradients for 9mA studies

Speaker: Dr Nicholas Walker (DESY)

Slides high-gradient-9mA.ppt

14:35 Proposed Pk/Ql studies at NML (via webex)

Speaker: Mr Brian Chase (FNAL)

Slides NML_future_studies.pdf

14:55 Lorentz-force detuning compensation using Least-Squares optimization (via webex)

Speaker: Yuriy Pischalnikov (Fermilab)

Slides Adaptive_LS-LFDC.pdf

15:10 Discussion

15:30 → 16:00 coffee

16:00 → 17:10 Closing session

Summaries and further planning.

16:00 Discussion of key findings and future plans

Mindmap LBT_Workshop_close-out_mindmap.pdf

Mindmap (Mind-Manager source file) LBT_Workshop_close-out.mmap

17:00 Closing remarks