Digital Interface for MCOR’s

Stan Cohen

Albuquerque, NM 505 881-8887

From the June 9, 2005 presentation by Dr. Stan Cohen - notes on slides 11 and 12 added by Paul Bellomo

MCORS & LCLS 2

Anatomy of an MCOR System

MCORS & LCLS 3

Using the MCOR System for LCLS Corrector Power Supplies

• High density – 8/16 Channels per crate• Use of a mature design for correctors• Minimal growth in the variety of spares

needed in inventory• Flexibility in DC bulk power supply choice• Require high precision/low noise digital

interface for monitor and control

MCORS & LCLS 4

Separate Interface Card

• One can deploy a new interface card with a new control protocol without changing anything else in the system!

• Topology of the interface control card is not tightly coupled to the bipolar switcher cards

• Interlock requirements may be different from SPEAR III

MCORS & LCLS 5

LANSCE Topology – The need to fit into the existing control system

MCORS & LCLS 6

Add Ethernet Connectivity and Mate to LCLS or SPEAR Control System

MCORS & LCLS 7

LANTRONIX Micro-board – Straight-forward Connection to Simple Differential Serial Bus

• Ethernet RJ45 (10BASE-T) connector • TTL data interface • Two (2) serial ports • Accepts 5V regulated input power • Internal web server, Serial, Telnet and SNMP

management • Flash ROM for easy software upgrades

MCORS & LCLS 8

And Now a Word from My Sponsor

MCORS & LCLS 9

is working on a bunch of stuff…

• PXI bus HV modules – Bira Partnering with N.I.• Bulk power supplies for MCORs• User interface - Custom touch panel embedded

processors• Power supply control and interfacing using

micro PLC’s• Power factor and phase identification • Rack monitoring • Things that we haven’t thought of yet

MCORS & LCLS 10

Target Illumination at the SNL Z-Machine

…and this is kind of neat

The led strip is vaporized with each shot.

MCORS & LCLS 11

Notes below added by Paul Bellomo of SLAC

1. Development of the Ethernet Controller is essentially a packaging effort that is estimated to take 2 to 3 months

2. Each controller is expected to cost about $2,000. This does not include non-recurring costs for the re-packaging.

3. If SLAC were to buy 160 MCOR12s for the SCOR6 replacements funds could be siphoned from the profits to do the re-packaging

4. The controller has a 16-bit DAC, but BiRa is looking 20-bit DACs.

5. The current 16-bit DAC has a 5ppm reproducibility, a 10ppm/C temperature coefficient, 2 kHz to 10kHz bandwidth and a settling time (unrecorded)

6. Its microprocessor runs at 20MHz

7. Stan (BiRa) would provide the programming and software

8. Antonio de Lira suggested an RS232 port for local control by a PC

9. Stan was asked about paralleling MCO12s and MCOR30s. The MCOR12 is a voltage source and cannot be easily paralleled. The MCOR30 is a true current source and can be paralleled.

Continued on the next slide

MCORS & LCLS 12

Notes below added by Paul Bellomo of SLAC

10.If an MCOR30 is used in parallel, say for the LCLS, the second unit would be in standby mode. If the first supply failed the second would be turned on. Although there would be some downtime, the MTTR would be reduced from a present 2 hours to perhaps a minute or two.

11.The MCOR12 and MCOR30 have analog PI controllers built into each board. The new Ethernet controller has a DAC for the MCOR reference signal. In the case of the SPEAR 3 MCOR30s which have a removable DAC, the DAC could be abandoned if desired.

12.In addition to the Ethernet controller, Stan also displayed BiRa’s new PSC-636 power supply controller. It is housed in a 3U high, standard 10” rack-mount chassis. It functions as a regulator, user interface, and contains the power supply state-machine logic

13.Stan displayed LED lighting that is very bright and programmable and a mini-PLC (manufacturer unrecorded)

14.Stan went to GMW to look at their new, very small Danfysik 200A current transductors. These could fit into a rack-mounted intermediate power supply. See the GMW website for details

15.GMW (Danfysik) is also selling 5 to 16kW intermediate power supplies with 25ppm current stability