EMMAElectrical Engineering

July 06

EE & PS Group

EE & PS Group – EMMA 06

www.4gls.ac.uk/ERLP.htm

Electrical Engineering - Overview

Specification, Assembly & Installation• Power Converters• Motion Control• Electrical DistributionAssembly & Installation• RF System• Vacuum & Control• Personnel Safety• Beam Diagnostics

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

Unipolar DC Power ConvertersElectron Ring

Option 1 – 42 F magnets series connected & 42 D magnets series connected. 2 power converters required – Used for costingsOption 2 – 42 F Quad magnets in series + 2 sets of 21 D Quad magnets in series. 3 power converters required

Transfer Line9 Quad magnets all individually powered, plus 1 dipole.10 power converters required

Diagnostic Line4 Quad magnets all individually powered. 4 power converters required

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

DC Power Converters Specification

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

Specification Required:Stability ±100ppm(Commercially available units tested to better than ± 50ppm)Resolution 15ppm(Set by DL control system – DAC for ERLP)

A Bipolar correctors design is available and can be built at DL

Improved performance will increase costs

Pulse Power Converters

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

Two Pulse power supplies are required:Injection KickerExtraction Kicker

Actual ratings and performance need to be specified

It is anticipated that these can be achieved with semiconductor switches

Similar design to that used on the SRS

Motion control requirements

• 84 axes for magnet adjustment.

• 21 axes for RF phase shifters

• 5 ancillary

• Magnets require +/-12mm of motion with a 5 micron accuracy.

• 1mm linear ballscrew with 400 step/rev provides 2.5 micron steps

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

Position Control FeedbackOptions

1. Closed loop encoder feedback.

2. Open loop with position information e.g. Sylvac probes

3. Open loop without feedback.

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

1. Closed loop control has the advantage of continually correcting position but is the most expensive option. High speed non-contact position feedback utilising tape scale linear encoders can easily provide resolutions of better than 5 µm. The encoder highlighted is compact and easy to install and set-up. Accuracy to ±1 µm/m,. Bi-directionally repeatable optical reference mark

Position Control Feedback cont’d

2. Open loop with position information e.g. Sylvac probes

A less expensive option - However it may require more software or controls interfacing which may offset any cost saving.

3. Open loop without feedback

We are currently investigating a stepper controller which operates stepper motors in a closed position loop without position sensors

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

Stepper Motors

• High energy Neodymium magnets for increased performance

• 50% more torque than conventional hybrid types• Choice of single or double shaft options• High quality & Economical prices• 8 leads provide the choice of Uni-polar or Bi-

polar operation

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

Electrical Distribution

• The ERLP distribution system has spare capacity which will be used for EMMA.

• 2 new distribution boards to be installed close to the rack positions.– 1 distribution board will be dedicated to the RF racks.– 1 distribution board will provide all other EMMA

supplies.• A cable route from the ERLP distribution in the Tower

basement to the new EMMA distribution boards is required. This will require diamond drilling.

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

Cable Management

• Overhead cable routes from racks into the centre of EMMA ring

• 3 levels of cable tray within the EMMA ring• Level 1 - magnet cables• Level 2 – controls cables• Level 3 – mains supplies

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

Rack Requirements

Number of Racks required:• Motion Control 2• Power Converters 2• Diagnostics 1• RF Auxiliary 3• Vacuum / Controls 3

Total 11

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

ERLP Rack room is fully populated, but even if available would require long cable lengths

An alternative location for the racks is required possible within the Experimental area

RF Amplifier Systems may require an additional 7 double racks

Power Converter & Control racks Location

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

Area available for controls and power converter

racks ?

Gantry solution preferred

Power Converter & Control racks Gantry

EE & PS Group – EMMA 06www.4gls.ac.uk/ERLP.htm

Typical Rack Gantry Required to house the Electrical equipment

7.5m

7.5m