NuMI BPM Setup for Initial Commissioning

1
NuMI BPM Setup for Initial Commissioning

• This note describes how to check and control the
  set-up of NuMI BPM Systems for use during initial
  NuMI beam start-up stages with single or partial
  Booster batch beam.
• The normal set-up controls are available on the
  BPM display page E44. Timing and scaling
  parameters that should be checked, but should not
  be altered by the casual user in attempting to
  solve system problems, are available on page R25.
• Once the system is properly set up there are no
  operating parameters that are useful to change
  until multi-batch operation begins.

2
Checking Set-up and Displaying Data

• Page E44 is the user interface to the NuMI BPM
  VME system set-up and data display.
• There are 3 VME front-end systems that comprise
  the NuMI beam line BPM system NBPM6S, NBPM6N,
  and NBPM65.
• E44 communicates globally to all three NuMI beam
  line BPM VME systems.

3
E44 Display Page

• This is the normal view entering BPM Display page
  E44. For initial commissioning, MI Proton to NuMI
  should be selected in Evnt Indx menu and
  AvgBatches selected in Data Type menu. Clicking
  on Flash Frame will read data from the most
  recent cycle of Evnt Indx type and display that
  data according to format selected in the Plot
  Setup window. Clicking Flash Frame does not
  initiate a measurement! CAUTION Calibrate
  Mode must be in DISABL state!!!!

4
E44 BPM Set-up

• This shows the Acquisition Spec Summary window
  that is brought up by clicking on the ACQ SPEC
  tab. For normal NuMI beam measurements, the MI
  Prot to NuMI acquisition mode must be enabled
  (ENA) and both the Diagnostic and Test
  acquisition modes must be disabled (DIS) as
  shown. Clicking on the MI Prot to NuMI line
  brings up the details of that acquisition spec as
  shown on the following page.

5
E44 BPM Set-up

• This shows the MIProtToNuMI acquisition spec
  detail window with the all the settings that
  should be used for initial NuMI beam
  commissioning. This is where the measurement Arm
  (TCLK A5) and Trigger (MIBS 74) events are set.
  For initial commissioning and for beam pulses
  shorter than one full Booster batch, Filter
  Type 6Batch53MHzPkSrch must be used. For a full
  batch or to obtain readings from multiple batches
  Filter Type 6Batch53MHzEdSrch may be used.

6
Checking Timing and Scaling

• Page R25 is the engineering interface to the NuMI
  BPM VME systems. Parameters are not intended to
  be changed by the general user from that page,
  however these parameters do affect system
  operation and must be correct. This page is
  presented so that proper timing and scaling
  parameters can be verified.
• R25 talks to the BPMs house-by-house, not
  globally, so each house must be checked
  individually.
• For initial commissioning all timing offset
  parameters should have values of zero as shown on
  next page.
• Scaling values should be set as shown on
  following pages.

7
Timing - Check Each BPM Front-end Separately

• Select NUMI from Area drop-down menu, select
  desired NUMI BPM systems (NBPM6S, NBPM6N, or
  NBPM65) one-by-one from the House menu, select
  Timing from Function menu, and Proton from
  Beam Mode menu. Verify that mdatEnable is OFF
  and that all timing values are zero for each
  house.

8
NBPM6S Scaling

• Column 1
• Position offset
• Column 2
• Position scaling
• Column 3
• Intensity offset
• Column 4
• Intensity scaling

• Select NUMI from Area drop-down menu, select
  NBPM6S from the House menu, and select Scaling
  from Function menu. Verify that scaling values
  match those shown above. This house includes four
  Main Injector BPMs that are scaled with a
  polynomial in the ACNET database, hence the unity
  scaling in the VME front-end.

9
NBPM6N Scaling

• Column 1
• Position offset
• Column 2
• Position scaling
• Column 3
• Intensity offset
• Column 4
• Intensity scaling

• Select NUMI from Area drop-down menu, select
  NBPM6N from the House menu, and select Scaling
  from Function menu. Verify that scaling values
  match those shown above. This house includes one
  Main Injector Wide Aperture BPM that is scaled
  with a polynomial in the ACNET database, hence a
  unity scaling in the VME front-end.

10
NBPM65 Scaling

• Column 1
• Position offset
• Column 2
• Position scaling
• Column 3
• Intensity offset
• Column 4
• Intensity scaling

• Select NUMI from Area drop-down menu, select
  NBPM65 from the House menu, and select Scaling
  from Function menu. Verify that scaling values
  match those shown above. This house includes
  standard and target style BPMs, hence the two
  different values.