High performance power supplies
Cyclotron Main Coils,
Dipole & Quadrupole Magnet Coils,
Bending Magnet Coils,
Rhodotron Coils,...
are products manufactured by JEMA-ELEC

 

POWER REGULATION FOR PARTICLE ACCELERATORS

All applications needing powerfull and ultra-stable magnetic fields use direct current power supplies with a long term stability of the nominal current value:

  • Linear and circular particle accelerators
  • Magnetic lenses
  • Magnetic deflectors
  • Magnetic resonance scanners.

In many cases the most intense magnetic fields are created using superconducting magnets.

Their power supplies must be equipped with ultra fast means of absorbing the high stored energy to prevent local overheating due to 'quenches". They must also be current-programmed.

Programming can be done by computer or by the power supply itself.
In the first case a power supply-computer interface is needed.
in the second case the power supply must have its own internal programmer.

ULTRA-STABLE POWER SUPPLIES, INTERFACE AND PROGRAMMERS ARE JEMA-ELEC SPECIALITIES

RANGE OF JEMA-ELEC SINGLE OR MULTIPLE
POWER SUPPLIES FOR PARTICLE ACCELERATORS :

Power :
Current :
Voltage :
Longterm stability :
Resolution :
Ripple :
Efficiency :

 100W to 600kW
0,1A to 10kA
0,5V tot 12kV
from ± 1,10-2 to ± 1,10-5
to 1,10-6
sameas stabilit
up to 90% under full load
REGULATION TECHNOLOGIES
MASTERED BY JEMA-ELEC:

Series transistors with or without preregulation, by variable autotransformer or thyristors.
Thyristors alone with single or double loop control

P.W.M. : - Switching mode regulation
- Pseudo Resonant switching
- Input current taken of the A.C. mains pseudo sinusoïdal, if necessary, avoiding harmonic currents in the mains.

 

In the category of particle accelerator power supplies, JEMA-ELEC has made a speciality of heavy ion and light ion source power supplies. When the ion source is composed of one filament circuit and one arc circuit, the best arc current regulation is obtained by a close loop-control of the "TRUE R.M.S." value of the filament current.
Heavy ion sources are sometimes very complex. This is true of the "OCTOPUS" ion source developped by the "CENTRE DE RECHERCHES DU CYCLOTRON" at the University of Louvain-la-Neuve.
JEMA-ELEC is a specialist in power supplies for the most types of ion sources.

Other JEMA-ELEC power supply projects:

  • Power supplies for triode and tetode high frequency power amplifier tubes, especially for cyclotrons.
  • Klystron tube power supplies.
  • D.C. and A.C. uninterruptible power supplies.
  • Telephone switching center power supplies.

A FEW USERS OF JEMA
HIGH PERFORMANCE POWER SUPPLIES :

RESEARCH CENTER 0F THE CYCLOTRON (Louvain-la-Neuve - BELGIUM)
All the Power Supplies of the 96MeV Cyclotron and the 30 MeV
Cyclotron comprising:

  • Main Coil PS. (1100 A - 325V and 120 A - 75V V P.S.'s with a long term stability UP TO ± 1,10-5 lnom)
  • Correction Coil and Harmonic Coil P.S.'s
  • Ion Source P.S.'s
  • H.V.H.F. tubes P.S.'s
  • Switching Magnet RS.'s
  • Bending Magnet P.S.'s
  • Beam Transport P.S.'s
    5 Power Supplies for an E. C. R. source

RADIO-ELEMENTS INSTITUTE (BELGIUM)
All the Power Supplies of a 96 MeV Cyclotron

I.B.A. - ION BEAM APPLICATION (Louvain-la-Neuve - BELGIUM)
All the Power Supplies of 13 units of 30MeV Cyclotron for the following users :

  • Medi + physics (USA)
  • Medi + physics (JAPAN)
  • DRL (JAPAN)
  • DU PONT MERCK PHARMACEUTICAL (USA)
  • ANSTO (AUSTRALIA)
  • BUFFALO (USA)
  • ERASME (BELGIUM)
  • PEKIN Institute 0f Nuclear Energy (CHINA)
  • SHANGAI Institute of Nuclear Energy (CHINA)
  • NORDION (BELGIUM)
  • MALLINKRODT I (NETHERLANDS)
  • MALLINKRODT Il (USA)
  • Atomic Energy Organisation of IRAN (IRAN)
  • I.P.E.N. (BRASIL)

All the Power Supplies of 10 units of 18 + Cyclotrons for:

  • THERAGENICS1 to9(USA)
  • I BT (BELGIUM)

All the Power Supplies of 4 units of 18/9 MeV Cyclotron for:

  • MONTREAL Neurological Institute (CANADA)
  • SCHREVEPORT Biomedical Research Foundation (USA)
  • BAD OYENHAUSEN Krankenhaus Gesellschaft (GERMANY)
  • ROSENDORF Forschung Centrum (GERMANY)
  • ULM (GERMANY)
  • UNIVERSITY PAMPELUNE (SPAIN)
  • ADASSA UNIVERSITY (ISRAEL)
  • GENEVE HOSPITAL (ZWISTERLAND)
  • UNIVERSITY AMSTERDAM (NETHERLANDS)
  • ESSEN (GERMANY)

All the Power Supplies for Rhodotron:

  • ISOMEDIX (USA)
  • STUDER (ZWISTERLAND)
  • A.E.0.I.( IRAN)
  • ENUSA (SPAIN)
  • ECI (BELGIUM)
  • RISTRON (GERMANY)
  • HOSPAL (ITALY)

All the Power Supplies of one 10 MeV Cyclotron for:

  • UNIVERSITY HOSPITAL K.U.L. (BELGIUM)

All the Power Supplies of 2 units of 3MeV Cyclotron for:

  • HAMMERSMISTH HOSPITAL LONDON (U.K.)
  • TURKU Uruiversity (FINLAND)

5E.C.R. Source Power Supplies for:

  • SUMITOMO (JAPAN)

SHI/SUMITOMO HEAVY INDUSTRIES (JAPAN)
Power supplies for HM18 Cyclotron

DU PONT MERCK PHARMACEUTICAL (USA)
4 Main Coil Power Supplies 0-420 A ± 1,10-5, 0-200 V for Cyclotron
1 Triple Bipolar Power Supply ± 50 A ± 1,10-4, ±20 V
4 Harmonic Coil Power Supplies 12x ± 10A, 20 V
4 HV-HF tube Power Supplies 12,5 kV-7A

RUTHERFORD APPLETON LABORATORY (U.K.)
2 Supra -conductive Coil Power Supplies 0-1000 A, ± 1,10-4,
5 V for the DELPHI Station of the L.E.P. (C.E.R.N. - GENEVA)

C.E.R.N. (GENEVA)
20 double Power Supplies 40 V - 6 A for special purposes (L.E.P. ring)
1 PowerSupply 1200 V - 10A
1 PowerSupply 2500 V - 2A
4 Power Supplies 0-200 A, 40 V (ordered by C. E R. N.) and delivered te ORSAY (LINAC - linearAccelerator - FRANCE)

C.G.R. MeV (FRANCE)
3 Cyclotron source triple power supplies for:

  • Medi + physics (USA)
  • UNIVERSITY HOSPITALS 0f CAEN and LYON (FRANCE)

AGOR Supra-conductive Cyclotron, developped by Orsay Nuclear Research Center - FRANCE for K.I.V. (NETHERLANDS)
Multiple Shim Coil Power Supply (23x 0-300 A, ± 1,10-4, 10,5 to 23 V)

UNIVERSITY of JYVASKILA (FINLAND)
4 E.C.R. Source Power Supplies

INSTITUT LACASSAGNE of NICE (FRANCE)
1 Ion Source Triple Power Supply

LURE-ORSAY - Laboratoire pour l'utilisation du Rayonnement - ordered by C.E.A. - Commissariat à l'Energie Atomique) - Saclay (FRANCE)
4 Magnetics Lens Power Supplies 200 A, 8 V - 300 A, 7 V - 450 A, 33 V and25OA, 70V

CYCLOPORE (BELGIUM)
1 TriangularWave Power Supply- 150A, 0, + 150A, 450 V for Target Scanning