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MTA BPM Electronics

MTA BPM Electronics

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MTA BPM Electronics

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  1. MTA BPM Electronics • NIM module, 4 inputs, 2 BPMs per board • Lock to external RF either 201MHz or 805MHz • Single network connection reads out ~ 10 boards • 12 bit sampling of IF I and Q waveforms up to • 44dB adjustable gain in demodulator chip • Diagnostic DAC can drive (via analog switches) each input up to about ¼ full scale (at maximum input gain); also drives FP lemo • 32 MB SDRAM available (e.g. data capture), but not used now • TMS470 micro-controller, programmed in C, handles control and readout • WIZnet 1” x 2” daughtercard provides TCP/IP stack (UDP capable) • All signal processing done in Altera Cyclone FPGA • Webpage for current Pbar system http://pbardebuncher.fnal.gov/wja/docs/ap2bpm/

  2. MTA BPM Card Details (2 BPMs/card) 5MHz Cut Off LTC2293 x 4 Quadrature Downconverters 300MHz Cut Off 12 Bit A/D Lo Pass I/Q Dat IN 0 A Ethernet Lo Pass WizNet IIM7010B Balun AD8348 Lo Pass 12 Bit A/D 12 Bit A/D Lo Pass I/Q Dat IN 0 B Lo Pass Balun A AD8348 TMS470 uC Lo Pass 12 Bit A/D D LRF/8 USB Rd Wrt 12 Bit A/D Lo Pass I/Q Dat IN 1 A Lo Pass Balun AD8348 A Lo Pass 12 Bit A/D SD RAM 16Mx16 Cyclone FPGA D 12 Bit A/D Lo Pass I/Q Dat IN 1 B Lo Pass AD8348 Balun RefIn/N I/O Lo Pass 12 Bit A/D LRF/8 402MHz ±Df LO 50% Duty Cycle ¸4 SysClk Sync I/O ¸N Ref In RJ-45 2/4/8/16 Divider Ref Sdat I/O AD9952 DDS 790-830 MHz VCO Ø Det ¸2 Spare I/O Err Amp FB

  3. Remaining Issues • Input connector options • SMA or SMB with patch panel • N-type – plug heliax directly in • Readout and Synchronization • Open Access Client (OAC) exists • Acts like ACNET front-end and handles all ACNET protocols (Readings, Settings, Data logging, FTP, etc) • Can’t guarantee 15Hz rate to synchronize with Linac Controls • Plan to implement necessary ACNET protocol for boards to respond at 15Hz to synchronize with other Linac devices like bpms in Linac Control System • Several options for how to do this • Can proto-type and test with an existing board • Speed of hardware should not be an issue • Only require 80 bytes of data per pulse • Hardware capable of more than 2MB/s • Beam Pulse Length from 2ms to 50ms in 1ms steps?

  4. Purchasing Boards • Approximately $800 per board • $12k for 15 Boards • No leadtime issues expected • If we want N-type connectors need to order right away