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Status of the LANSCE Upgrade LA-UR-03-3378

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)

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Status of the LANSCE Upgrade LA-UR-03-3378

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  1. Status of the LANSCE UpgradeLA-UR-03-3378 Eric Bjorklund

  2. 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

  3. 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

  4. What Is RICE, And Why Is It Hard? • RICE = Remote Instrumentation & Control Equipment • The original data acquisition front-end for LAMPF. • Approximately 10,200 channels are still connected. • (about 60% of the total hardware channels)

  5. RICE Features Typical RICE Module • 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)

  6. 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 Timing Signals Ethernet

  7. 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. • 396 (~6 x 1045) 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

  8. 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 20th Particle Accelerator Conference, May 2003, Portland OR, USA

  9. 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 20th 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 20th Particle Accelerator Conference, May 2003, Portland OR, USA

  10. 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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