Low Level RF Control System � Brian Chase � MaRIE Meeting � March 2016 � �
LLRF Experience and capabilities � • RF systems – � – Broadband through 3.9 GHz � – Copper and SRF � – Triodes, Tetrodes, IOTs, Klystrons and Magnetrons � – Linacs and Synchrotrons � – Analog, DSP and FPGA based systems � – Presently we have about 50 systems in operation � � 2 � AD/LLRF � 3/9/16 �
SRF LINAC Involvements � • Tesla Test Facility � Helen Edwards • A0 Photo Injector � • ILC LLRF Development team � • NML -> FAST � – 32 cavities/klystron � • Interactions with XFEL team � • Project X, PIP-II, PXIE � • CMTS-1 � • LCLS-II LLRF team � – LBNL, JLAB, FNAL, SLAC � � 3 � AD/LLRF � 3/9/16 �
RF Stations Diagram � PXIE LLRF DIAGRAM Reference HWRCavProbe8 Reference MEBT Tap Tap Half-wave Resonator Cryomodule (162.5MHz.) Single-spoke Resonator Cryomodule LEBT (HWR)(162.5MHz.) HWRCavProbe1 (SSR1)(325MHz.) BPM & S (162.5MHz.) BUNCHING S Corrector FAST BUNCHING BUNCHING Corrector R coil & FAST CAVITY2 FAST coil CHOPPER CAVITY1 CAVITY3 1 BPM ABSORBER H H H H H H H CHOPPER CHOPPER H W W W W W W W RFQ W R R R R R R R R #1 #2 M 162.5ResonanceCntrl5 M M M M M M M M M M M M M M M DUMP 162.5ResonanceCntrl4 162.5ResonanceCntrl3 325ResonanceCntrl1 325ResonanceCnrtl8 162.5ResonanceCntrl3 162.5ResonanceCntrl12 BCavProbe1 BCavProbe2 162.5ResonanceCntrl1 SSRCavProbe8 SSRCavProbe1 RFQProbe BCavProbe3 RFQREV BCavREV3 HWRCavREV1 SSRCavREV8 BCavREV1 BCavREV2 HWRCavREV8 SSRCavREV1 BCavFWD3 RFQFWD HWRCavFWD1 HWRCavFWD8 SSRCavFWD1 SSRCavFWD8 BCavFWD1 BCavFWD2 1 …………………… ...8 1 …………………… ...8 PA PA PA PA PA PA PA PA 162.5Interlock2 162.5Interlock3 162.5Interlock4 162.5Interlock5 162.5Interlock12 325Interlock1 325Interlock8 162.5Interlock1 CHOPPER PROGRAM MODULE LLRF crate 1: LLRF crate 1: 2X 3X 3X - CPU, PS - CPU, PS RFQProbe, BCavREV[1..3] - 3 LLRF MFC HWRCavProbe [1..8] - 2 LLRF MFC SSRCavProbe [1..8] RFQFWD, BCavFWD[1..3] HWRCavFWD[1..8] SSRCavFWD [1..8] - Timing Distribution - Timing Distribution RFQREV, BCavProbe[1..3] HWRCavREV[1..8] SSRCavREV [1..8] 24 16 LLRF crate 2: LLRF crate 2: - CPU, PS - CPU, PS - Interlock Systems - Interlock Systems 162.5Interlock[1..12] 36 325Interlocks[1..8] 24 LLRF crate 3: LLRF crate 2: LLRF crate 2: - CPU, PS - CPU, PS - CPU, PS - Motor Controller - Motor Controller - Motor Controller 325ResonanceCntrl[1..8] 162.5ResonanceCntrl[1..12] - Resonance Controller - Resonance Controller - Resonance Controller Local Oscillator Timing & Synchronization B. Chase, E. Cullerton, D. Klepec 1/14/13 Inter-System Feedback Network/Bus Version 1.0 MPS Network/Bus 4 PXIE Review, B.
Control system interface diagram (NML) � ACNET PREFIX FF and SP Timing ( � S) N:M1___ CMLLRF operational system Integral ()KIGN ()TDLY initial delay (SP only) Z:N1 ___ CMLLD development system Gain ()TFIL fill time 1.31 ()TFT flat top time 15.36 16.36 � Clamp +/- ½ FS 4096 ()IPOL 15.36 (After Filtering) 14.4 N GAIN/ CAV 1 1.9305 1/2 Integrator 12/16 4 16/12 ATTEN Z -1 m 2 Pole Up 0.5 Vpp Down 1.31 Converter FS Converter ()FBEN +/- +/- +/- +/- 1.29 Vpp Max +/- +/- +/- +/- +/- +/- +/- +/- +/- +/- +/- +/- DAC 20480 8192 8192 8192 (6.2 dBm) 2048 4096 4096 12288 4096 1536 6144 8192 16384 8192 8192 8192 ()RFEN 1:2 12.0 13.0 15.16 14.6 14.6 15.6 16.4 14.6 14.6 14.6 14.4 14.4 14.4 16.2 Iout 14.4 15.4 14.4 14.0 MULT ADC Round/ � � � � x 4 +/- Saturate Feedback Qout RF Fixed Notch 8192 Clamp Variable Notch Clamp 2 Vpp CIC LP FIR ON/OFF BPF Filter(D=12) Filter Filter(2.95 MHz) Filter(900 kHz) ON/OFF 2.16 FS FS FS DAC Vector Atten = 12/16 Gain = 16/12 +/- Unity Gain Unity Gain +/-1 Sum 8192 14.4 ()NCHF FF Set Point 0.5 Vpp ()FFEN 2.16 Clamp 14.2 ON/OFF ()NCHQ FS FS +/-8192 +/-8192 ()SPA A , � A , � 14.2 25.4 ()SPQ FeedForward ()FFA 2.14 ()SPTu : � 2.14 ()FFQ Amplitude Phase Amplitude Phase Limit (0 M 1.99) 11.5 Limit(0 M 0.99) +/-180 +/-180 ()FFRA ratio a fill /a ft +/-2 +/-1 Prop Gain ()KPGN ()C[1-8]CM ()CUCM CAVITY MUX 1 VSUM MUX 2 (+/- 1024) MUX 3 MUX 4 MUX 5 ()C[1-8]CQ ()CUCQ MULT TRUNC TRUNC TRUNC TRUNC TRUNC TRUNC x 4 13.3 13.3 14.2 14.2 15.1 16.0 14.2 Dec 60 Dec 30 Dec 30 Dec 30 Dec 30 Dec 30 Dec 30 CIC Filter CIC Filter CIC Filter CIC Filter CIC Filter CIC Filter CIC Filter Fs = 1.04MHz Fs = 2.08MHz Fs = 2.08MHz Fs = 2.08MHz Fs = 2.08MHz Fs = 2.08MHz Fs = 2.08MHz Atten = 225/256 Atten = 225/256 Gain = 225/256 Atten = 225/256 Atten = 225/256 Atten = 225/256 Atten = 225/256 12.4 12.4 14.2 14.2 15.1 14.2 16.0 Waveform Scaling Slot 0 Raw = input*256/225 MULT MULT MULT MULT MULT MULT MULT x16 x 16 x 4 x 4 x 2 x 4 x 1 Labview Primary = Raw/32768 Raw Units 16.0 16.0 16.0 16.0 16.0 16.0 16.0 Labview Common = C*Primary C = Cav_To_MV_m = Fwd_To_SQRT_kW Primary/ = Rev_To_SQRT_kW Common Units 5 PXIE Review, B.
System on Module Multi-cavity Field Controller (SOM-MFC) � SOM is socketed and upgradable 6 � AD/LLRF � 3/9/16 �
SOM-MFC LLRF Controller � (16) 14 bit ADCs System on Module (8)14 bit DACs 7 � AD/LLRF � 3/9/16 �
NML CM1 LLRF Racks Receivers and Up-converter VXI CPU & 3 R3MFC Controllers Capable of driving 32 cavities from a single klystron Master Oscillator Power Supplies AD/ 8 � LLRF �
LLRF Control interface � 9 � AD/LLRF � 3/9/16 �
LCLS-II and MaRIE XFEL �� • Project is very closely aligned � – 1.3 GHz 9-cell cavities � – 3.9 GHz in bunch compressor section � – 0.004% rms, 0.004 degree rms � • LCLS-II LLRF collaboration team � – Larry Doolitte* (LBNL), Curt Hovater (Jefferson Lab), Brian Chase (FNAL), Sandeep Babel(SLAC) � – Strong groups at each lab � • Complete prototype system tests at Jlab and FNAL this summer � • Multi-lab support for a basically drop in system � * Technical lead � 10 � AD/LLRF � 3/9/16 �
RF parameters � • 900 usec fill, 100 usec beam � • 0.01%, 0.01 deg � • 60 Hz operation � • 10 MW klystrons split 26 ways � • Ql = 2.9E6 � 11 � AD/LLRF � 3/9/16 �
LCLS-II 1.3 GHz HPRF Penetration Layout � North Side LLRF SSAs AD/LLRF � 12 � Nantista, Stewart w/ team input
Because of the XFEL style split � • Best technical fit � • Recommend that the XFEL LLRF system be cloned � – It is developed by a very large team, has all the firmware and software � – Hardware is available from industry � • If this is nonviable for non-technical reasons then the LCLS-II team is very capable to complete this project � � 13 � AD/LLRF � 3/9/16 �
Feedforward only 300kW 2.9E6 � 14 � AD/LLRF � 3/9/16 �
Closed loop with current parameters � 15 � AD/LLRF � 3/9/16 �
Optimized for power/fill/flattop/cryo � 550usec fill 500usec flattop 16 � AD/LLRF � 3/9/16 �
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