Versions Compared

Old Version 3

changes.mady.by.user Storey, Doug Wesley

Saved on

compared with

New Version 4

changes.mady.by.user Storey, Doug Wesley

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

The table below is an estimate of the max rep rate that does not do bad things, i.e. trip the EPS, trip off the DPS, or trip the beamline valves.

OLD STUFF BELOW:

at the TCAV - CC3073, and the TCAV waveguide ion pumps.  The maximum has been designed as the max rate at which no change is seen at either of these locations.

Note - only H2 limits have been checked so far. And these will change when the rest of the US-DPS is installed.

Note 2 - this rep rate does not guarantee appropriate background pressure between shots. This needs to be considered separately.

Image Added

Note - this plot does not guarantee happiness. Things may still trip off, and this does not take into account the PB background pressure, this can be considered separately from the below data.

See more info here: http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2022/28/12.07&pos=2022-07-12T22:12:49Image Removed


How to set up DPS:

  1. Follow the gas jet how to page to get the gas jets ready: How to use gas jet
    1. Use the plot above to chose the max backing pressure and rep rate
  2. Ensure both US-DPS and DS-DPS pumps are running and operating as normal.  Also check VPIO:LI20:3164 to ensure the ion pump is on.
  3. Start a strip tool and load the file: DPS_Gasjet_Pressures.stp
  4. Park the beam on TD11
  5. Insert VVPG:LI20:3160 and VVPG:LI20:VV3250
  6. Increase the setpoints on the VV:3250 interlocks on gauges 3291:DS2 and 3249
    1. Select each gauge, then select the "More..." button beside Status in the "Interlock Output Pressure Status" and increase to 1e-3 on each gauge.
    2. Remember to set this back at the end of the shift!
  7. Set interlock bypasses on VGXX:LI20:3171:US1 and VGXX:LI20:3259:DS1. These gauges will read high pressure while gas jets are firing.
  8. Fire the gas jet once and watch the strip chart. If the 3130 and 3291 pressures say below ~1e-5 Torr
  9. Fire the gas jet for a minute or so and watch the strip chart.
  10. If all looks good, then stop the gas jets and open the beamline valves
  11. Fire the gas jets and watch CC3073 pressure. If there is no change, then you are good to fire at will.

...