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Next Linear Collider Test Accelerator and EPICS. PSI Epics Meeting May, 2001 S. Allison, R. Chestnut, M. Clausen, K. Luchini. Current NLCTA Controls. Originally an EPICS target Mixture of SLC, Labview, Veetest Slow (1/2 Hertz control) Two structures with two klystrons each

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Next linear collider test accelerator and epics

Next Linear Collider Test Accelerator and EPICS

PSI Epics Meeting

May, 2001

S. Allison, R. Chestnut, M. Clausen, K. Luchini

Current nlcta controls
Current NLCTA Controls

  • Originally an EPICS target

  • Mixture of SLC, Labview, VeetestSlow (1/2 Hertz control)

  • Two structures with two klystrons each

  • “Process” structures to show feasibility/durability for NLC

  • Desire to run without operators present

What s the big deal
What’s the big deal?

  • Structures are critical for NLC design

  • Results are pivotal for the NLC cotillion at Snowmass

  • Current intense involvement by a diagnostics group SWAT team

  • Current intense scrutiny by management

NLCTA RF Processing Layout

Drive 1






Drive 2





These measurement points correspond to thevariables mentioned in the briefing. These are in Joules, and are the integral over the RF pulse.

The move to epics
The move to EPICS

  • Slow IOC (MV177)

    • Alan Bradley

    • VSAM

  • Fast IOC (MVME 2700)

    • ADC signals

    • TDC signals

    • DAC control

    • Digital I/O

Slow ioc
Slow IOC

  • Alan Bradley interface to move from Veetest to Epics

  • Prying details from PLC programmers

  • Lots of signals – the devil is in the details

  • Work well under way, with many details remaining

Fast ioc
Fast IOC

  • 60 (or 120 Hz) operation

  • New (for us) integrating ADC, TDC, DAC and digital I/O support

  • New (for us) Power PC

  • Requirements specify pulse by pulse monitor and control of structure processing

Fast ioc hardware
Fast IOC Hardware

  • MVME 2700 Power PC

  • Caen V265 Gated ADC (3)

  • Lecroy 1176 TDC

  • VMIC 2534 32-bit Digital I/O

  • VMIC 4100 12-bit D/A

  • Joerger VTR812 12-bit digitizer (later)

Fast ioc fast loop
Fast IOC fast loop

  • Read in 20 ADC signals and 6 TDC signals

  • Perform limit checks on various power measurements

  • Disable on one felony OR two parole violations in quick succession

  • Provide ring buffers for off-line analysis

  • All of the above synchronized on each pulse

Fast adc and piop records
Fast ADC and “PIOP” records

  • One ADC interrupts; other records fired by events; whole fast loop is one lockset.

  • One “ADC” record for each module

  • Quadratic conversion per channel

  • Circular buffers built in

Fast adc record
Fast ADC Record

120 Hz

8 HW Inputs

Per Channel:

Signal in Joules

N-sec circ. buffer




8x3 conversion coefficients

Fast ADC and “PIOP” records

  • One “PIOP” record per structure – not 1-to-1 with ADC records.

  • “PIOP” record has 20 or so db links to hard-coded PVs.

  • One ADC and one PIOP at 60 Hz take 6% of the MV177

  • Seems to take about .0016 seconds per loop.

Piop subroutine record
“PIOP” subroutine record

120 Hz


Calculate NORM, LOST

Check for warning/error

Drive GO/NOGO digital output


9( or maybe12) converted

ADC signals + limits

Fast ioc asynchronous fast code
Fast IOC asynchronous fast code

  • Implement re-enabling strategies for different failure modes

  • Watch vacuums and other relevant data

  • Can also trip off on vacuum

  • All of the above fast, but asynchronous to the pulse-by-pulse flow

Next milestones
Next Milestones

  • May 7 – have local testing done; ready to move equipment down to NLCTA.

  • May 15 – next run starts; be ready to run parasitically

  • June 29 – Current structures at end of life; Snowmass; cut over to Epics as primary system.

The other 20
The other 20%

  • Displays (many)

  • Infrastructure (save/restore, archiver, configs, CUDs, StripTool, SIP, SCP support, alarm logging)

  • Testing – modules, drivers, and fast, synchronous software

  • Matlab support (offline event analysis)

The really big deal
The really big deal

  • Data storage for archiving(Network layout, computer center role, etc.)

  • Faster machines (additional load!)

  • NLCTA could keep a fast Sun busy AND fill any space we can give them.