1. LLRF developments at DESY Holger Schlarb on behalf of the LLRF team LLRF Workshop 2015 Shanghai, 03.11.2015

2. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 2 LLRF controls for RF facilities at DESY… > FLASH 1&2…&3 (56 SRF 1.3GHz / 4 SRF 3.9GHz/ 1 NRF gun) Continuously Upgraded + Multi-beam operation In construction till Q3/2016 Inj. in operation > European XFEL (808 SRF 1.3GHz / 8 SRF 3.9GHz / 1 NRF gun)  MOST PERSONNEL Completed 2014 Continues test of modules Rate 1.25/week > Accelerator Module Test Bench (AMTF) (3 x RF stations 1.3GHz + 1 x 3.9GHz)

3. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 3 LLRF controls for RF facilities at DESY… > Cryo Module Test Bench (CMTB), pulsed or CW operation Upgraded R&D on CW / quasi CW SRF operation Upgraded + Investigations on stability/ ramp up > PITZ (NRF Gun, Booster, Trans Def. cavity all 1.3GHz) Upgraded (single cav. regl.) R&D on precision regulation > REGAE (NRF Gun, Booster at 2.998GHz)

4. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 4 LLRF controls for RF facilities outside DESY… > ELBE at HZDR (1 SRF gun, SRF 4 cavities, 1 NRF Buncher 260MHz) > FLUTE at KIT (NRF gun / NRF TW structure, 2.998GHz) > Support HoBiCaT/bERLinPro (1 SRF gun, 3 booster, 4 SRF cavities 1.3GHz) > … and more MicroTCA.4 LLRF System installed Software integration ongoing Commissioning 11/2015 Software integration ongoing HoBiCat commiss. bERLinPro Currently under construction…. Courtesy: A. Jankwiak Courtesy: A.-S. Müller Courtesy: M. Kuntzsch

5. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 5 Construction of variety of different LLRF System in short time … was possible through large portfolio on LLRF modules based on MicroTCA.4 DRTM-DWC10DAMC-TCK7DeRTM-LOG1300 DRTM-VM2LF Struck GmbH Vadatech Ready for licence DRTM-DWC8VM1 Struck GmbH SIS8325 Stuck GmbH DRTM-VM2HFDRTM-DS8VM1DRTM-DWC8VM1HFDeRTM-CLK Ready for licence Struck GmbH evaluation DeRTM-LOGLF/HF On demand Stuck GmbH 0.35-0.7GHz 3-6GHz ~ MHz 6 GHz Dynamique Standard RF Modules (used by FLASH & XFEL) DAMC-FMC20DRTM-PZT4 DFMC-MD22 EicSys Single cav. extension Supplementary module extension Frequency extension 2013-2015 through Validation Fund: almost all modules are now available by industry 2014/15 many improvements w.r.t. performance, features and additional functionalities CAEN-els RF Backplane

6. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 6 Operational experience with MicroTCA.4 LLRF system at FLASH > 2 years of operation of FLASH with MicroTCA.4 LLRF system  Significant improvement in regulation performance  System is operating stable (main issues found and fixed)  Found one issue with SSD/Raid array failure > Continue upgrade of the system  Software development, further automation routines  Upgrade of hardware components  Integration of long term stability improving modules > Next major milestones  Integration with opt. synchronization system  Recommissioning of the fast intra-train feedback  Link stabilized reference Talk by Uros Mavric, We

7. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 7 Operation experience with LLRF System at FLASH… 1.3 GHz  0.06 deg / %RH 3.9 GHz  0.18 deg / %RH Strong impact of RF drifts caused by humidity… Cavity patch panel mitigated using drift calibration module Talk by Frank Ludwig, Fr.

8. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 8 LLRF for XFEL > LLRF: DESY in-kind  26 RF stations (808 cavities, 101 cryomodules)  MicroTCA-based LLRF system, master / slave  Vector sum (32 cavities) RF control  Motorized cavity tuners  2 piezo per cavities (1kHz tuning)  Motorized Q L, one-time fixed power ratios KLYSTRON CM1 (8 cav.) CM2 (8 cav.)CM3 (8 cav.) CM4 (8 cav,) LLRF master LLRF slave BEAM MicroTCA supporting modules RF parameters:  Pulse length 1.4msec (750 + 650 usec)  Q L = 4.6e6 (½ bw = 140 Hz)  10 Hz rep. rate  ΔA/A = 0.01% ΔΦ = 0.01 deg. Talk by Julien Branlard, Th. Main challenge: Overall complexity > 3000 RF signals to be processed High requirements dA/A<1e-4, d  <0.01° No / difficult access to system  Very careful low noise and low drift design  Redundancy were ever possible + sufficient diagnostics and remote controls Hardware production: over 2000 complex units and more than different 30 unit types Mass production: QE/QC, many vendors had to be trained some vendors failed….

9. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 9 LLRF for XFEL “ The GOOD, the BAD and the UGLY” Professional cabling (in & out) Rack Assembly and Test Area (RATA) MicroTCA Assembly Area (MASSA) Storage Talk by Julien Branlard, Th.

10. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 10 Synchronization for the XFEL Redundant Master Oscillator Talk by L. Zemala, Fr. RF interferometer based distribution Talk by K. Czuba, Tu. 260 tap points

11. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 11 Further Developments … > FLASH multi-beam operation > Frequency control through pulse width modulation > Sub-10fs digital intra-pulse control at REGAE > Automatic testing of Cryomodules at AMTF > LO and CLK generation for XFEL > XFEL Cryomodule under CW operation Talk by V. Ayvazan, We.Talk by S. Pfeiffer, Th.Talk by M. Hoffmann, Fr.Poster by M. OmetPoster by U. MavricPoster by W. Cichalewski

12. Holger Schlarb | LLRF’15 Workshop Shanghai | 2015/11/03 | Page 12 Thanks for your attention