SLAC to the Future Dan Van Winkle, Joe Frisch, Bo Hong, Jim Sebek, Charlie Xu, Andrew Young LLRF Activities at SLAC

2 Outline SLAC Lab Talk – LLR ‘15 What’s up at SLAC? … A LOT LCLS II New Machine Mission Readiness Common platform LLRF (ATCA) FACET II New GUN/Positron damping Ring SPEAR III LLRF Activities Other Activities ESS LLRF (A. Young)

3 SLAC Overview - Today SLAC Lab Talk – LLR ‘15

4 SLAC Overview - Tomorrow SLAC Lab Talk – LLR ‘15

5 LCLS II SLAC Lab Talk – LLR ‘15

6 LCLS-II SLAC Lab Talk – LLR ‘15 LCLS II is a new superconducting CW LINAC. RF CW frequency is 1300 MHz Beam Rate is 1MHz Cavity Field Control Design Specification For the time period > 1 Hz : 0.01% and 0.01 o For the time period < 1Hz, the LLRF system will be supported by EPICS BBF (commissioning) and eventually a dedicated BBF system. LLRF controller work is being done by partner labs (LBNL/FERMILAB/JLAB). Phase Reference Line and LO distribution being done by SLAC

7 LCLS-II LLRF Scope SLAC Lab Talk – LLR ‘ MHz RF Gun 1300 MHz Buncher MHz Cavity Controllers GHz Single Source Single Cavity Controllers Courtesy Curt Hovater (JLAB)

8 LCLS-II Other Talks SLAC Lab Talk – LLR ‘15 Various talks and posters throughout the week will be focusing on the LCLS-II Effort Nov 3 10:41 JLAB LLRF Work - Rama Bachimanchi Nov 3 13:45 Analog-centered LLRF System Design for LCLS-II – Larry Doolittle Nov 5 14:40 On feedback control of superconducting cavities including the mechanical dynamics – Claudio Rivetta And probably some posters and hallway conversations…

9 Mission Readiness SLAC Lab Talk – LLR ‘15

10 Mission Readiness SLAC Lab Talk – LLR ‘15 The Department of Energy has realized that the infrastructure at SLAC is nearing end of life (50+ years) and is investing in upgrading many systems in the 3km Linac. 30 Sectors with 8 Stations each – 240 RF stations 10 Sectors removed for LCLS-II 10 Sectors for FACET II 10 Sectors for LCLS-I – 80 Stations Much of this stuff is extremely hard to maintain

11 Mission Readiness – Upgrade LLRF System SLAC Lab Talk – LLR ‘15 The Mission Readiness LLRF team has decided to use the ATCA Based High Performance Platform being developed for LCLS-II non-LLRF systems. This High Performance ATCA systems consists of: A Dual Bay Double full AMC - ATCA carrier card. Each Carrier Card can host 2 double full AMC cards with 2 AMC connectors per card.

12 Mission Readiness – High Performance System SLAC Lab Talk – LLR ‘15

13 Common Platform SLAC Lab Talk – LLR ‘15 Progress to date: Carrier Card 2 nd Rev Complete – All working Demo Card All Channels work satisfactory performance demonstrated to apporove development of BPM (LCLS-II) and LLRF (LCLS-I/SPEAR III). BPM Card – In test Multi-Purpose ADC Card - In layout MPS Cards – schematic design

14 Mission Readiness – Demo Card SLAC Lab Talk – LLR ‘15 ADC/DAC Run at 370 Msamp/Sec

15 Mission Readiness – Demo Card Results SLAC Lab Talk – LLR ‘15 Results for down-convert channel Very poor phase noise is input and LO generator

16 Mission Readiness – Demo Card Results SLAC Lab Talk – LLR ‘15 Subtracting Common Mode phase noise and 300 kHz digital low-pass yields pretty good results – no showstoppers seen

17 Mission Readiness – Station Block Diagram SLAC Lab Talk – LLR ‘15 Courtesy Joe Frisch (SLAC) Precision Board – Ready for FAB Up-Converter Board – Ready for DRC cleanup

18 Mission Readiness – FY16 SLAC Lab Talk – LLR ‘15 Test Board Pair Develop Firmware Install in demo station Run with Beam Board turn if necessary and begin production

19 FACET II SLAC Lab Talk – LLR ‘15

20 FACET II SLAC Lab Talk – LLR ‘15 FACET-II deliverables: 10 GeV, dense O(10x10x10 um) electron and positron bunches at S20 IP region. Up to 60kA peak current for electrons, 10kA for positrons. Utilize the LCLS-II (phase 1) injector in sector 10 to provide up to 5nC electron bunches. Positrons: Use existing production system & return lines, new DR in S10 tunnel.

21 FACET II SLAC Lab Talk – LLR ‘15 Project is in early stage (CD1) so LLRF content is fairly pre- mature, but will be needed. Items needing attention are: LCLS II (phase I) Injector. This system was built and nearly commissioned. Based upon mTCA architecture. Damping Ring LLRF uses repurposed SLC DR. Equipment is old and may need some attention. Timeline is FY CD-1 Review was held on Oct 27/

22 SPEAR III LLRF Activities SLAC Lab Talk – LLR ‘15

23 SPEAR LLRF Upgrade Plans SPEAR and its Booster have legacy LLRF systems System performance meets requirements But support infrastructure at lab has disappeared Upgrading to new LLRF systems based on new SLAC high performance LLRF platform Dramatically improves system performance Allows for more flexible programming of control loops Standardizes hardware with other, larger, programs at SLAC Systems can be maintained using SLAC infrastructure

24 SPEAR3 Booster LLRF system Electrons ramp from 120 MeV to 3 Gev at 10 Hz rate Current system is a copy of SPEAR2/PEP-I (1970s) -Separated analog amplitude and phase loops Upgrade in 2016 Use new SLAC modules Feedback loop will monitor -Five cavity probes from single 5 cell cavity -Drive power -Forward power -RF reference Signals decomposed into I and Q Loop drives DDS to generate drive power for SSA

25 SPEAR III Booster Upgrade SLAC Lab Talk – LLR ‘15

26 SPEAR3 RF System LLRF system Current system is a copy of PEP-II (1995) -RF mixed down to baseband I and Q -Analog loops regulate I and Q -Vector modulator feeds drive amplifier Upgrade in 2017 Use new SLAC modules Feedback loop will monitor -Four cavity probes from four single cell cavities -Drive power -Forward power -RF reference Signals decomposed into I and Q Loop drives DDS to generate drive power for klystron

27 Work for Others SLAC Lab Talk – LLR ‘15

28 Work for Others SLAC Lab Talk – LLR ‘15 SLAC’s new TID (Technology and Innovation Directorate) has a new (partial) charter to find new work for SLAC that utilizes our core competencies. A big part of that is: Work for Others (WFO). In Chi-Chang’s words: “ Create a Technology and Innovation Directorate at the laboratory that will capitalize on our unique set of core competencies and allow us to pursue new opportunities in these areas to grow the laboratory.” To date, the AIR (Advanced Instrumentation Research Division has worked on at least two collaborations with new construction projects around the world at ESS (LLRF and BPM) and PAL XFEL (BPM). Both are mTCA based projects.

29 ESS SLAC Lab Talk – LLR ‘15 SLAC and ESS are collaborating on designing a new super-heterodyne front-end mTCA RTM for use in the ESS BPM and LLRF systems. A pre-series board has been fabricated and is currently being tested. The board is designed to mate with a commercial 125 MSPS ADC module (SIS8300L/2 from Struck) Courtesy Andrew Young(SLAC)

30 SLAC Lab Talk – LLR ‘15 Thank you for your attention!