EBIS ARR Andrew McNerney May 4-7, 2010 Hazards and Controls for Electrical, Control, Instrumentation and Conventional Systems.

EBIS ARR

Andrew McNerney

May 4-7, 2010

Hazards and Controls for Electrical, Control, Instrumentation and Conventional Systems

Power Distribution System

• The ac power for the EBIS systems is supplied from the L-4 13.8kV to 480V,2500kVA substation . It was installed when the building addition was constructed

• L-4 has high resistance grounding and ground fault detection that is remotely monitored.

• Arc flash calculations have been completed for the distribution system and panels have been labeled with the appropriate PPE requirements. The distribution of hazard categories is:

Five category 3

Four category 2

Four category 1

Eleven category 0+

• All breakers have been labeled

Conventional Hazard Control

• Wet pipe ordinary hazard sprinkler system in EBIS building addition with duct smoke detection

• Lower equipment bay has sprinkler system

• Alarms tied into building system, MCR and Fire Rescue

• Addition of smoke detectors in EBIS addition connected to alarm panel planned before unattended operations-this would give early warning before sprinklers are activated

• Fire rated cable used

• Exit pathways marked and maintained

• Combustible loading minimized through regular clean-ups

• Fire extinguishers installed on both floors of EBIS addition

• MCR and CAS incident command structure integrated into BNL

Power Supplies

• EBIS: There are 58 power supplies in the EBIS on 3 major voltage platforms. AC power is provided to the platforms and series connected “stacked “ supplies by low capacitance isolation transformers.

EBIS platform: pulsed to 100kV Cathode platform: EBIS -20kV Collector platform: EBIS + 15kV

Platforms and the EBIS source are enclosed in a Kirk key interlocked grounded wire mesh/ flame retardant polycarbonate cage. Procedure followed for entry into enclosure. Kirk key system reviewed by C-AD Chief Electrical Engineer.

• Cathode and Collector Platform HV supplies are in Kirk key interlocked enclosed racks within the HV cage

Power Supplies: EBIS PS Block Diagram

Power Supplies (continued)

•Power Supplies external to the high voltage cage are made safe for access/maintenance through lock and tag procedures .

•Cabinet doors are locked for exposed voltages 50 Volts and above

•Cable trays for ac input, dc output and control wiring are grounded and partitioned for separation of power and signal cables.

•Cable trays in HV cage at EBIS potential are bonded to EBIS platform

•Power supply outputs 600 volts or greater are enclosed in metal conduit or shielded cables.

•No exposed terminals 50 volts or above

• All units (including supplies in HV cage) have been EEI inspected.

Power Supplies: LEBT & Ext. Ion Sources

70 Power supplies for the LEBT/Ion Injection

• Flat and Spherical Electrostatic Steering • Electrostatic Quadrupoles

• High Current Pulsed Electromagnetic Solenoid

• Electromagnetic Steering

• 11 Hollow Cathode Ion Source P

• Source Elements: Bias Platform, Lenses, Filters

• Transport Elements: Electrostatic Deflectors and Quadrupoles

• 7 Liquid Metal Ion Source PSs

• Source Elements: Bias Platform, Grids

• Transport Elements: Electrostatic Deflectors and Quadrupoles

Power supplies: MEBT & LINAC

• 4 Power supplies for the MEBT

• Four 900A Fast Pulsed Electromagnetic Quadrupoles

• 2 Power Supplies for the LINAC

• Two for 900A Fast Pulsed Electromagnetic Triplet

Power supplies: HEBT

• 20 Power Supplies for the HEBT

– Two for 900A Fast Pulsed electromagnetic triplet

– Seven 40A Slow Pulsed Electromagnetic Quadrupoles Nine 20A Slow Pulsed Electromagnetic Steerers One 3,000A, 250V, Slow Pulsed Supply for Two Big

Bend Magnets One 20A Slow Pulsed Back Leg Winding PS for Big

Bend Magnet Offset

PS Summary

EBIS 58

ION INJECTION & LEBT 70

ION SOURCES 18

MEBT 4

LINAC 2

HEBT 20

172 total

Radio Frequency Systems (RF)

• Five 100.625 MHz Systems for RFQ, Linac, Rebuncher and 2 Debunchers -Pulse Width ≤1 ms -Repetition Rate ≤ 5Hz

• Digital low level RF(LLRF) system based on the common controller platform of the C-AD LLRF Upgrade.

• RFQ & Linac systems manufactured by Continental Electronics - 5kW drivers power two 175kW output stages feeding coaxial hybrid combiner

• Buncher/Rebuncher systems manufactured by Armstrong Transmitter - One 10kW and two 20kW units• Lock and tag control of electrical energy• Cabinet doors locked• Coaxial lines and cabinets checked for rf leakage as system are brought on line

RF: RFQ & Linac Amplifiers

Coaxial transmission line output system mounted above amplifiers

RF: Rebuncher/Debuncher Amplifiers Under Factory Test

Instrumentation

• Instrumentation is based on devices currently in service in operating beam lines

• Electronics chassis have been EEI inspected

Location and QuantityDevice Ext Ion S LEBT MEBT HEBT

Current Transformer 1 2 1 3Fast Faraday Cup 1

Faraday Cup 5 2 1 2Multiwire 1 1 2Collimator 1

Phase Probe 1Pepperpot 1 1

Time of Flight 1

Diagnostics:Bergoz Current Transformer in 12 inch Conflat Flange with Electronics

Diagnostics: Faraday Cup

• Detector head pneumatically plunged into beam path to collect entire ion beam; captured charge measured as a current in electronics

- Fully destructive measurement – can also be used as beam stop

- Provides time average current and pulse waveform data

• Fast Faraday Cup: Coaxial structure that allows observation of bunch structure of beam (available from previous project)

Diagnostics – Multiwire Monitor for Transverse Beam Profiles

32 X 32 and 16X16 arrays available-can be installed with Faraday cup on dual feed-through

Diagnostics: Pepperpot Emittance Head

• Acquires x and y emittance data in a single EBIS pulse

• Live beam profile image displayed provides immediate feedback to EBIS operator on beam focus

• Software provides pulse to pulse emittance calculation

Mask

Microchannel plate Phosphor screen

Elliptical mirror

Incomingion beam

To CCD camera

Diagnostics: Current Transformer in HEBT

Diagnostics: Faraday Cup/Multiwire/Collimatorin Booster Section of HEBT

Controls

• The Control System is an extension of the existing C-AD system

• It controls and/ or collect data from power supplies, instrumentation, vacuum devices and RF systems.

• Power Supply Interface (PSI) devices are located with controlled equipment and are optically isolated from local control computers (front end computer-FEC).

• Timing is provided by optically isolated trigger modules controlled by a synchronizing event link system

• 3 Linux work stations provided for EBIS machine development

• Hardware is EEI inspected

Overview of Controls Network

Typical Power Supply Control Path

POWER SUPPLY

PSI

VME CHASSIS

PRO

CE

SSO

R

V2

33

VME BACKPLANE

Ethernet

Analog I/O

Digital I/O

Fiber Optic Xmit/Rcv

Ground HV Platform

SC Magnet Safety/Bake-out Precautions

• Safety Plan in Place for Operation/Entry of SC Magnet

• Unescorted Entry Requires static magnet field training and “read and sign” of safety plan

• Field is Below 100 Gauss Outside of Fenced Enclosure

• 500 gauss 80 cm radial from ends

• 5 Gauss Boundary Marked on Floor

• Warning signs in Place

• EBIS Vacuum Bake-out will follow existing Vacuum Group Procedures