Difference between revisions of "NPS sweeper setup"
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===Setting up NPS sweeper and correctors=== | ===Setting up NPS sweeper and correctors=== | ||
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| + | * Whenever setting the SHMS/NPS to an angle/setting that has not been used before (at the present energy/pass), a procedure must be followed to ensure that the correctors are set the correct value to compensate for the stray field from the NPS sweeper | ||
| + | * When first getting ready to turn on the sweeper at a new setting, call MCC and request that they execute the NPS sweeper setup procedure | ||
| + | * The MCC procedure (still in draft form) can be found here: [https://hallcweb.jlab.org/wiki/images/1/16/Hallc-nps-sweeper-dipole-setup-proc-rev1b4.pdf] | ||
| + | * As part of the procedure, MCC will ask for the predicted currents for the correctors. Those values can be found here: [https://hallcweb.jlab.org/wiki/images/9/93/NPS_angles_currents.pdf]. Use the values at the SHMS angle closest to the desired running angle. | ||
| + | * Note that during the NPS sweeper setup, the beam should be in tune mode, not CW. | ||
| + | * The general steps of the procedure are: | ||
| + | ** Steer the beam to the dump with the NPS sweeper off - observe on the dump viewer | ||
| + | ** Ramp the sweeper in steps and check for movement at the dump | ||
| + | ** If the sweeper does move the beam, add current to the correctors in steps | ||
| + | ** Empirically determine the final corrector settings with the NPS sweeper at full current | ||
Latest revision as of 14:10, 9 October 2023
Setting up NPS sweeper and correctors
- Whenever setting the SHMS/NPS to an angle/setting that has not been used before (at the present energy/pass), a procedure must be followed to ensure that the correctors are set the correct value to compensate for the stray field from the NPS sweeper
- When first getting ready to turn on the sweeper at a new setting, call MCC and request that they execute the NPS sweeper setup procedure
- The MCC procedure (still in draft form) can be found here: [1]
- As part of the procedure, MCC will ask for the predicted currents for the correctors. Those values can be found here: [2]. Use the values at the SHMS angle closest to the desired running angle.
- Note that during the NPS sweeper setup, the beam should be in tune mode, not CW.
- The general steps of the procedure are:
- Steer the beam to the dump with the NPS sweeper off - observe on the dump viewer
- Ramp the sweeper in steps and check for movement at the dump
- If the sweeper does move the beam, add current to the correctors in steps
- Empirically determine the final corrector settings with the NPS sweeper at full current
