Presentation on theme: "Status of the LANSCE Upgrade LA-UR-03-3378 Eric Bjorklund."— Presentation transcript:
Status of the LANSCE Upgrade LA-UR-03-3378 Eric Bjorklund
History LANSCE began life in 1972 as “LAMPF” an 800 MeV proton accelerator for studying mesons. Storage ring added in 1985. Principle focus changed from mesons to neutrons in 1997. First control system upgrade (1979-1988) –Change from centralized system based on SEL-840 (DTL-logic) computer to distributed VAX-based system. Second control system upgrade (1994-200?) –Started with conversion of storage ring controls to EPICS
Present Status All the easy parts have been done. –17 IOCs –10,069 PV’s (6,447 hardware channels) –484 dm screens –101 tcl/tk screens –13 java app’s Remaining “hard” parts –Diagnostics Harps Wire Scanners Emittance –Timing –RICE
What Is RICE, And Why Is It Hard? RICE = R emote I nstrumentation & C ontrol E quipment –The original data acquisition front-end for LAMPF. Approximately 10,200 channels are still connected. –(about 60% of the total hardware channels)
RICE Features Analog Input –12 Bit ADC –~64 channels/module Analog Output –Stepper-motor controlled pots –~25 channels/module Binary Input –~144 channels/module (12 words) Binary Output –~48 channels/module (4 words) –Latched to readback channels Fast Protect Status –12 channels/module (Binary Word 8) Typical RICE Module
RICE Architecture Star configuration –Up to 127 modules. –72 modules currently in use. Serial communication lines from RICE Interface Unit (RIU) to RICE modules. RIU issues parallel read requests. –Provides transverse snapshot of accelerator. –“Vector Data” –Fast Protect status read this way Read requests can be delayed relative to the start of the machine cycle. –“Timed Data” Read requests can be queued for machine cycles with specific beam gate configurations. –“Flavored Data” RIU Ethernet Timing Signals
RICE Special Features Timed Data –Any channel can be sampled at any time in the machine cycle –Poor-Man’s “Scope Trace” by sampling the signal over several cycles at successive time increments. –“Non-RF” tag allows us to sample outside the RF gates. (eliminates RF noise on signals that are supposed to be stable) Flavored Data –Any channel can be sampled on a cycle with any arbitrary combination (present/absent/don’t care) of beam gates. –3 96 (~6 x 10 45 ) possible “flavors”. –Not all of these flavors are useful. Vector Data –Transverse snapshot of all the data on a particular channel. –Fast Protect trips reported this way. Any combination of the above
The “Easy” Part of RICE About 9,000 of the existing RICE channels (88%) don’t require any of the RICE special features (timed / flavored / vectored) –May still need to worry about “Non-RF” Plan in progress to replace binary input, binary output, analog output, and “easy” analog input channels with Allen-Bradley Control-Logix PLCs. –Binary Input:1756-IB32 –Binary Output:1756-OW16I/A –Analog Input:1756-SC-IF8U –Analog Output:AMCI-3202/AMCI-3204 (stepper motor controller) Proof-of-Principle experiment during 2002 run cycle. –All binary I/O from one RICE module (except Fast-Protect) replaced with Allen-Bradley. M.Oothoudt, et al., “The LANSCE RICE Control System Upgrade”, (LA-UR-03-2758) Proceedings 20 th Particle Accelerator Conference, May 2003, Portland OR, USA
The “Easy” Part of the “Hard” Part of RICE Fast-Protect being broken out into a separate system. Most of the “Timed” channels only use a single (default) time and flavor. An intelligent, 14-bit, 8 channel, 10 MHz, VME waveform digitizer board is being developed for a new Low-Momentum Detector application. –Rob Merl, et al., “A Multiwire Proportional Chamber System for Monitoring Low Momentum Beam In Accelerators”, (LA-UR-03-2923) Proceedings 20 th Particle Accelerator Conference, May 2003, Portland OR, USA Idea is that this board can be adapted to handle timed data, either by external trigger, or picking the desired data point out of the waveform. –Rob Merl, et al., “High Speed EPICS Data Acquisition and Processing on One VME Board”, (LA-UR-03-2925) Proceedings 20 th Particle Accelerator Conference, May 2003, Portland OR, USA
The Hard Part of the Hard Part of RICE Flavored Data: –May need special record support. Vector Data: –Do we need time-correlated data from PLCs? General Timed/Flavored Data Problem: –Each application wants to pick its own time and flavor. –Change time/flavor spec on a per-read basis. –No vocabulary for this in channel access.
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