NuMI Beam line Power Supplies

1
NuMI Beam line Power Supplies

• The supplies in the line is detailed
• Main Ring Style..1
• PEI/Transrex 500Kw.10
• PEI 20Kw..10
• PEI 240Kw..2
• MI Correction elements...6

2
Transrex vs PEI 500Kw supplies
3
Rework

• All of the PEI style power supplies have been
  modified and installed
• Controls cables are installed in MI60 and MI62
  but final connection will completed after the
  data base is setup.

4
Series Regulation

• The groups of supplies will be regulated by one
  current regulator.
• Each supply will have an SCR Unit with a closed
  voltage loop, the same as the single supplies.
• All the supplies act as if they are one.
• The supplies will all receive the same voltage
  reference.
• The P1 and A1 lines have this supply
  configuration in operations now.

5
Upgrades

• Reused Main Ring SCR Unit.
• Better Voltage control.
• Maintenance techs have experience and knowledge.
• Little or no down time due to these chassis.
• Need new current loop added to the chassis.
• Added a filtered voltage monitoring card to the
  chassis.
• New Gate Firing circuits.
• Two Quadrant operation. (Invert).
• Remove Diodes in the Bypass and add SCRs.

6
Ramp Calculator

• Each Load Will Use the Max P.S. Voltage.
• Operation will have only one data point to
  adjust.
• Same control as the P1,P2,P3 and A1 lines

7
Power Supply Controls

• C468 Ramp Generators Current Reference.
• Each magnet load will have one current reference.
• Voltage reference feed forward created by P.S.
  reg.
• L di/dt IR and Integrator

8
MI Regulation Improvements

• The C468 cards DAC output has too much noise and
  drift.
• We are installing a local DAC in the current
  regulation system to improve the noise.
• The local DAC has better temperature drift
  numbers but is not in a better environment.
• Additional improvement will be installed as
  needed.
• Temperature regulation of the DAC.
• Flattop correction for magnet temperature.
  (JITTER)
• Low Beta/MI style Current regulator.
• BmLB Learning system.

9
Series Power Supply Controls

• The reuse of existing equipment requires a series
  connection of two or three supplies on each of
  three magnet loops.
• The operations interface needs to be simple.
• Look like only one supply to the operations
  crews.
• Controlled turn on and off.
• Access for maintenance needs to be simple.

10
Beam Loss Issues

• The current regulation system has an absolute
  value circuit on the current error and will abort
  the beam in the MI if the supply is out of
  regulation.
• For the more critical loads an independent window
  detector will not allow the beam to leave the MI
  if the current is not within the window at
  flattop time.
• Two of the supplies have critical device
  controllers installed.

11
Present Status

• All the PEI supplies are installed.
• Five are installed at MI-60.
• The HV101 loop has 3 supplies in series.
• The Lam60 and V100 loops are single supplies. We
  expect to add filters later for improved
  regulation.
• A Main Ring style supply is being installed at
  MI-62 for the V105 loop.
• A single PEI is installed at MI-62 for the V110
  loop. A filter will also be added to this loop.
• All the 20Kw quad loop power supplies are
  installed.

12
Present Status Continued.

• The smaller 20Kw supplies have had simple
  modifications and installed in MI-60 and MI-62.
• The digital status has been increased. This will
  read back to the MCR all things that trip the
  supply.
• The MI ring uses this type of supply in the MI-8
  line and the supplies being installed in the NuMI
  line will be brought up to the same level of
  controls.

13
Pulsed Power Source

• The MI-62 power panel and transformer has enough
  unused equipment for all the NuMI supplies being
  added as a result of the addition of the Main
  Ring supply for the V105 loop.
• MI-60 has a new power panel installed but the
  1,500Kva pulsed duty transformer has not been
  installed.
• All the line power and controls installations
  have been completed at both 60 and 62 with with
  the exception of the V105 supply. Civil
  construction needs to be completed before the
  transformer can be installed.
• All load connections will require extended MI
  access.

14
Expected Completion of Supplies

• The supplies in the MI-62 and MI-60 building
  should be completed Sept 2000. Assembly of the
  Main Ring supply cabinet has started but will not
  be able to be tested until the civil construction
  is complete.
• All the controls can/will be tested. We have
  started the HV101 power supply controls testing.
• The Voltage regulation system can be tested using
  a temporary load. The current regulation and
  filter testing will have to wait until the loads
  are connected.

15
NuMI Regulation Improvements

• Any improvements to the MI beamline regulation
  system will be added to the NuMI line supplies.
• The improved flattop regulation will be added
  after we have proven it in the MI lines.
• Improved current feedback in terms of DCCTs will
  be added as needed for each loop.
• The Low Beta/MI ring current regulation chassis
  will be added for even better current reference
  as needed.
• The BmLB regulation system will be used only if
  necessary.