1. SLAC uTCA review 4-5 June 2012 Anders J Johansson Lund University Some slides from Zheqiao Geng and Tom Himel)

2. Committee Alan BioccaLBNL Brian ChaseFNAL Dmitry TeytelmanDimtel Gunther HallerSLAC Jim SebekSLAC John CarwardineANL Kay RehlichDESY Lawrence DoolittleLBNL Richard FarnsworthANL Ryan Herbst, ChairSLAC Website: https://slacportal.slac.stanford.edu/sites/ad_public/events/mtca_llrf_jun_2012/Pages/default.aspx 2

3. LCLS-II: The New Upcoming Project 3 LCLS-II 4 th generation light source underway Injector approved for construction 2013-15 Linac, beamlines (2 undulators) 2014-17 MTCA.4 proposed, approved for Injector A.Limited application to Injector RF, BPMs B.Broader future application to RF, Controls, Interlocks for 2-mile main linac (1/3 linac used by LCLS-I, LCLS-II and FACET high energy plasma wakefield experiment) From Zheqiao Geng

4. New LLRF Architecture 4 From Zheqiao Geng

5. RF 10 Ch RTM, ADC-FPGA-DAC 5 IPMI Extender To RF Chassis Trig, RF Ref In RTM Design – A. Young RTM layout – C. Yee ADC-DAC – Struck SIS8300 From Zheqiao Geng

6. New Stripline BPM Design – Motivation 6 Pizza Boxes require large network plant, rack space LCLS Stripline BPM System From Zheqiao Geng

7. BPM µTCA Shelf Replaces Rack 7 Up to 9 BPM processors per crate Most network cable interconnects move to shelf backplane, eliminating external cables From Zheqiao Geng

8. Prototype Board Complete, Under Test 8 Analog Front End RTMStruck 125 MHz digitizer From Zheqiao Geng

9. BPM chassis Each has: – 4 signal cables (unavoidable) – A trigger at beam time cable – A calibration trigger cable – An ethernet port for channel access – An ethernet port used to pass raw data at 120 Hz to a VME IOC for processing as the internal CPU is too slow – A serial connection to a terminal server to allow viewing of the IOC console – A power cable to an ethernet controlled power strip so power can be cycled to perform a remote reset. 9 From Tom Himel

10. BPM chassis This was a design kludged together from available parts in 4 months when originally planned design for LCLS failed. Was then propagated to 10 linac sectors as didn’t have time to do a proper redesign and wanted its improved analog performance. It works! Physicists are quite happy. But REALLY don’t want to propagate this again! Needs a design using a crate e.g. µTCA. 10 From Tom Himel

11. BPM in µTCA Each module has: – 4 signal cables (unavoidable) – A trigger at beam time cable – A calibration trigger cable – An ethernet port for channel access – An ethernet port used to pass raw data at 120 Hz to a VME IOC for processing as the internal CPU is too slow – A serial connection to a terminal server to allow viewing of the IOC console – A power cable to an ethernet controlled power strip so power can be cycled to perform a remote reset. 11 On backplane PCIe on backplane to CPU Only CPU has one IPMI handles this From Tom Himel

12. Selection of Review Charges and Answers Is μTCA.4 the right standard for the future instrumentation and controls at SLAC? – UTCA.4 appears to be one of a number of suitable options for future accelerator instrumentation and accelerator controls at SLAC. Given the proper institutional commitment, uTCA.4 will work well. Where else is it used? – DESY, KEK evaluating, SLAC ICD evaluating, ESS evaluating. 12

13. Selection of Review Charges and Answers (cntd.) Is it becoming a wider standard? – Unclear. Has Industry become more involved with developing this standard? – Yes. Has the SLAC team appropriately evaluated alternatives? – Maybe. 13

14. Selection of Review Charges and Answers (cntd.) Are there specific advantages or disadvantages to be expected in the future? – There are clear advantages to upgrading the system to include FPGA connected ADCs and DACs. Is the μTCA.4 LLRF system sufficiently mature to be adopted by the LCLS-II Project? – Yes 14

15. Selection of Review Charges and Answers (cntd.) What are the risks and how can they be mitigated? – There is a risk in making a decision too early. Some more tests and time are required. – Grounding, cross talk & cable pickup have also been identified as risks. There is a risk in the BPM design concerning the availability of a 250Mhz digitizer if required. 15

16. Selection of Review Charges and Answers (cntd.) Given that our current systems in use including VME are all obsolescent to varying degrees in architecture and performance, what is the preferred platform for new machines that will serve a wide range of I&C needs for the next 20 or more years? – UTCA.4 is not appropriate for a wide range of I&C needs. If not μTCA.4, what would you recommend? – There is not a single solution for a wide range of I&C needs. 16

17. Other points from the discussions ”COTS” is not well defined uTCA.4 longevity is dependent on installed base Need for redundancy? Need for performance: backplane speed, power to slots? Alternatives have benefits: ATCA, PXI, Linux- boxes, Pizza-boxes 17

18. PICMG Standards organisation uTCA.4 is defined by PICMG – SLAC, DESY are members – I recommend that ESS should become a member if we intende to use uTCA.4 Access to standards documents Access to guides ”best practices” Cost: 2500 USD/year 18