Status of mTCA Stripline BPM Development June 4-5, 2012 Dan Van Winkle for BPM team: Sonya Hoobler, Tom Himel, Jeff Olsen, Steve Smith, Till Straumann, Ernest Williams, Chuck Yee, Andrew Young

2 Outline Background –Motivation System Description –Physics Requirements –Proposed new design –Cost comparisons –Technical Overview Current Status Schedule Risks –mTCA –Pizza Box –VME/AFE Next Steps mTCA BPM Development June 4-5, 2012

3 Background mTCA BPM Development June 4-5, 2012

4 Background 4 Flavors of BPMs mTCA BPM Development June 4-5, 2012 LCLS Pizza Box FACET – LINAC CAMAC FACET – Sector 20 XTA

5 Background Assumptions –LCLS II will use existing BPMs whenever possible (CAMAC) –91 new BPMs will be necessary for LCLS II. These will be some type of “new” electronics. –The existing linac BPMs will eventually need to be upgraded to something more sensitive (exactly like LCLS I). –This development is targeted at both the new BPMs for LCLS II and the upgrading of the existing BPM electronics throughout the linac. mTCA BPM Development June 4-5, 2012

6 Why not just clone the LINAC (CAMAC) BPM electronics? (Motivation) CAMAC technology is obsolete and becoming more difficult to maintain –Obsolete Parts –PDR Specs can not be met (this was demonstrated in LCLS I) –Technical expertise is disappearing –EPICS incompatibility mTCA BPM Development June 4-5, 2012

7 Why not just clone the LCLS-I stripline BPM electronics? (more Motivation) Pizza Box solution was a quickly thrown together solution used to replace a COTS solution that did not work out. It worked so well that it is now used throughout LCLS I. Unfortunately: Coldfire CPU in pizza box is too wimpy to do full job of IOC. Hence special private network link to a VME IOC to transfer data for processing. –Requires VME crate/CPU/EVR per 4 BPMs Takes multiple people each with special expertise to put in a new BPM or even to repair an existing one. Requires a lot of network equipment and cables. mTCA BPM Development June 4-5, 2012

8 System Description mTCA BPM Development June 4-5, 2012

9 Physics Requirements mTCA BPM Development June 4-5, Differences from LCLS I 10pC Charge 2 Bunches

10 Design Proposal A new designed based upon the emerging technology of mTCA was proposed. –New design can be used for rest of LCLS-II (even the injector if we get the design done in time) –New Design at 250 Msamp/sec (300 MHz center frequency) means existing cable plant can be used (for existing LINAC BPMs. (~500k$ savings) –Allows for mix and match of systems (LLRF/BPMs) in same shelf (theoretically sharing infrastructure costs) mTCA BPM Development June 4-5, 2012

11 Deliverables Design build and install one crate of 3 BPMs in a sector (1 st 20 sectors) –We expect to use new 250 Msamp/sec ADC or potential undersample at 125 Msamp/sec using Struck Board –The analog front end electronics will be a new design, same topology as pizza box front end (but higher in frequency) –The necessary software will be done to integrate the BPMs into the EPICS control system Mass production for 10 sectors (LCLS II) will be a separate AIP funded outside LCLS II core project. mTCA BPM Development June 4-5, 2012

12 Cost Comparisons mTCA BPM Development June 4-5, 2012 Cost Comparisons Between Systems Micro TCA LCLS - I XTA Hardware Labor Estimate960 Hardware Labor Estimate2880 Hardware Labor Estimate1920 Digitizer4250 Pizza Box3598 Digitizer2200 RTM (AFE)1500 AFE2100 Total6710 Total6478 Total6220 Crate 9 BPMs1BPM 9 BPMs1BPM Shelf5300 Crate (21 SLOT)8495 Crate (21 SLOT)8495 Crate (4-slot) 3885 MCH2300 CPU4125 CPU4125 CPU2125 EVR2700 EVR2700 Power Module1000 EVR Fanout550 EVR Fanout550 EVR3300 Network Switch (x2)360 Network Switch(x2)360 Power Switch600 Power Switch600 Total14025 Total Total Max Number of BPM/Shelf9 9 9 Max Cost per BPM (1BPM)$20, $18, $18, Min Cost per BPM (9 BPM)$8, $8, $8,090.00

13 Requirements Similar Analog Front end at new frequency (300 MHz) (next slide) Expect slightly better dynamic range to accommodate new 10 pC charge limit for LCLS II Initial operation will use internal clock. For multi-bunch operation, phase synchronous ADC clock will be required to extract bunch phase information (238 MHz). mTCA BPM Development June 4-5, 2012

MHz vs. 140 MHz mTCA BPM Development June 4-5, 2012 By using 300 MHz instead of 140 MHz gain 4.6 dB of signal level This allows us to potentially save large sums of cabling costs when we eventually upgrade the LINAC BPMs. (New LCLS II BPMs will not see this cost advantage due to pulling of new cables anyway.

15 System Description mTCA BPM Development June 4-5, 2012 Up to 9 BPM processors per crate

16 RTM Signal Flow Block Diagram mTCA BPM Development June 4-5, 2012 Calibrator 4 Channels of Analog Processing

17 Current Status mTCA BPM Development June 4-5, 2012

18 3 RTM Boards Loaded –Initial RF testing complete –Initial Data acquisition complete RTM CPLD Programmed and verified FPGA on AMC card started –Code for driving and control of CPLD 250 Msamp digitizer spec started (90% complete). mTCA BPM Development June 4-5, 2012

19 Prototype Board Complete (in test) BPM AIP Review April 11, 2012 Analog Front End RTMStruck 125 MHz digitizer

20 Modifications of 125 MS/s Board mTCA BPM Development June 4-5, 2012

21 Initial Results mTCA BPM Development June 4-5, 2012 Measured Results from mTCA system on “simulated” Beam Signal

22 Schedule mTCA BPM Development June 4-5, 2012

23 Current Schedule BPM AIP Review April 11, 2012

24 Schedule Comments Tight Schedule to make LCLS II Injector FDR’s for Injector occurring in July/August time frame. Hardware installed in racks not required till late There is some belief that we can still get the design into the LCLS II injector. mTCA BPM Development June 4-5, 2012

25 Risks mTCA BPM Development June 4-5, 2012

26 Risks (mTCA) mTCA Infrastructure –New standard - interoperability is a potential issue – we are diligently working on this Digitizer –Counting on vendor which is currently struggling with 10 channel design. However vendor seems solid and recent vendor visit put most fears to rest. –Potential delays due to vendor Manpower availability/Priority Setting Backup Plan for injector is VME digitizer with AFE in small pizza box. mTCA BPM Development June 4-5, 2012

27 Risks (Pizza box) Obsolete Parts Unsupportable PADs with “wimpy” coldfire CPU’s Redesign necessary on PAD for continued use Custom electronics which must be supported for the indefinite future. mTCA BPM Development June 4-5, 2012

28 Risks (VME Digitizer/AFE) (Backup Plan) Custom Boards (ADC and AFE) (not COTS) Could be obsolete parts on digitizer Custom electronics which must be supported for the indefinite future. May not be able to do multi-bunch operation mTCA BPM Development June 4-5, 2012

29 Next Steps Calibrator needs to be tested Finish FPGA code in Struck 10ch digitizer Order new digitizer (250 Msamp/sec version) System software and integration mTCA BPM Development June 4-5, 2012