Detailed Steps for Tuning In-Flight Beams: Difference between revisions
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## Get docs from operations on primary and degraded beam TOFs and the charge state and slit scan data | ## Get docs from operations on primary and degraded beam TOFs and the charge state and slit scan data | ||
## Acquire the final cup/collimator FC currents and any notes on degraded beam transmission | ## Acquire the final cup/collimator FC currents and any notes on degraded beam transmission | ||
## Note down RAISOR slit settings (in particular the midplane vertical slits are key) | |||
## Insert detector of choice, make sure HV and preamps are on and daq is alive w/ noise etc | ## Insert detector of choice, make sure HV and preamps are on and daq is alive w/ noise etc | ||
# Get a reference spectrum from the degraded beam (can be done at RAISOR exit or target depending) | # Get a reference spectrum from the degraded beam (can be done at RAISOR exit or target depending) | ||
## Cut back beam by x100 w/ slits (not RAISOR slits) first then insert all available attenuation (~x15 Million) | ## Cut back beam by x100 w/ slits (not RAISOR slits) first then insert all available attenuation (~x15 Million) | ||
## Place beam on detectors and slowly remove attenuation until rates are roughly >100 Hz & < | ## Place beam on detectors and slowly remove attenuation until rates are roughly >100 Hz & <500 Hz | ||
## Take ref spectrum - optimize daq params and save the settings file as they should not be changed for the duration of the run | ## Take ref spectrum - optimize daq params and save the settings file as they should not be changed for the duration of the run | ||
# Determine the RF Sweeper phase for full or largest degraded beam removal | # Determine the RF Sweeper phase for full or largest degraded beam removal | ||
## Set degraded beam rate to few hundred Hz and get Grafana running | ## Set degraded beam rate to few hundred Hz and get Grafana running | ||
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## TURN OFF THE SWEEPER FOR NOW (or maybe only needs to have V=0) | ## TURN OFF THE SWEEPER FOR NOW (or maybe only needs to have V=0) | ||
## Should be back to the few hundred Hz rate as at the beginning | ## Should be back to the few hundred Hz rate as at the beginning | ||
# Identify the secondary beam | |||
## | # Identify the secondary beam | ||
## | ## Incrementally scale the RAISOR / beam line magnets in 0.5-1% steps until 1% or so past expected scale value | ||
## Take a fixed time run with the daq (Compass and Ryan's boxscore separately would be good to cross check things). | ## At each step, remove attenuation to achieve the 100-500 Hz rates and searching for the beam of interest | ||
## Take a fixed time run with the daq to note rates / purities (Compass and Ryan's boxscore separately would be good to cross check things if needed). | |||
## Generate cuts at each step to track the movement of the beam charge states etc. | |||
## Identify the isotope of interest based on calculated energies or previous production of the isotope | ## Identify the isotope of interest based on calculated energies or previous production of the isotope | ||
## Calculate the rate of the isotope of interest as the pps / pnA [note: pnA value from FCA001 divided by q of primary beam] | ## Calculate the rate of the isotope of interest as the pps / pnA [note: pnA value from FCA001 divided by q of primary beam] | ||
#Optimize and transmit secondary beam | #Optimize and transmit secondary beam | ||
## Once beam is on peak scale factor, make sure operators have access to direct rate of secondary beam either via | ## Once beam is on peak scale factor, make sure operators have access to direct rate of secondary beam either via grafana | ||
## Operators should optimize tune at | ## Operators should optimize tune at desired location | ||
## After operators scale the secondary beam line elements for transport to the target, check spectra at the target to ensure ID of the correct beam | ## After operators scale the secondary beam line elements for transport to the target, check spectra at the target to ensure ID of the correct beam | ||
## If needed, follow the steps to get reference spectra for the target detectors as well by going back to the degraded beam settings (dont forget all the attenuation) | ## If needed, follow the steps to get reference spectra for the target detectors as well by going back to the degraded beam settings (dont forget all the attenuation) |
Revision as of 02:03, October 23, 2020
Overview of the steps for In-flight beam delivery
Once steps for degraded beam tuning have been completed and a good focus is found at the RAISOR midplane (Separate detailed sheet for this), the steps below can be used to help guide the identification and tuning of the secondary beam.
- Acquire information on primary/degraded beam tunes and prep for beam
- Get docs from operations on primary and degraded beam TOFs and the charge state and slit scan data
- Acquire the final cup/collimator FC currents and any notes on degraded beam transmission
- Note down RAISOR slit settings (in particular the midplane vertical slits are key)
- Insert detector of choice, make sure HV and preamps are on and daq is alive w/ noise etc
- Get a reference spectrum from the degraded beam (can be done at RAISOR exit or target depending)
- Cut back beam by x100 w/ slits (not RAISOR slits) first then insert all available attenuation (~x15 Million)
- Place beam on detectors and slowly remove attenuation until rates are roughly >100 Hz & <500 Hz
- Take ref spectrum - optimize daq params and save the settings file as they should not be changed for the duration of the run
- Determine the RF Sweeper phase for full or largest degraded beam removal
- Set degraded beam rate to few hundred Hz and get Grafana running
- Have operations turn on Sweeper to Voltage=2 and phase=0 to start
- Note: You already may see a reduction in the beam rate do not increase beam current to get back to few hundred Hz
- Scan the RF Sweeper Phase in 5 degree steps, noting on Grafana or elsewhere, what angle the beam rate is a minimum
- Do smaller steps of ~1 degreed around the regions of the minimum to try and get the best angle
- TURN OFF THE SWEEPER FOR NOW (or maybe only needs to have V=0)
- Should be back to the few hundred Hz rate as at the beginning
- Identify the secondary beam
- Incrementally scale the RAISOR / beam line magnets in 0.5-1% steps until 1% or so past expected scale value
- At each step, remove attenuation to achieve the 100-500 Hz rates and searching for the beam of interest
- Take a fixed time run with the daq to note rates / purities (Compass and Ryan's boxscore separately would be good to cross check things if needed).
- Generate cuts at each step to track the movement of the beam charge states etc.
- Identify the isotope of interest based on calculated energies or previous production of the isotope
- Calculate the rate of the isotope of interest as the pps / pnA [note: pnA value from FCA001 divided by q of primary beam]
- Optimize and transmit secondary beam
- Once beam is on peak scale factor, make sure operators have access to direct rate of secondary beam either via grafana
- Operators should optimize tune at desired location
- After operators scale the secondary beam line elements for transport to the target, check spectra at the target to ensure ID of the correct beam
- If needed, follow the steps to get reference spectra for the target detectors as well by going back to the degraded beam settings (dont forget all the attenuation)
- Once isotope has been identified at the target, take a measure of the pps / pnA rate
- Operators should now optimize tune at the target position
- Optional: Turning on the RF Sweeper:
- TBD
Definitions
- primary beam - the beam species and charge state taken out of the source at the ATLAS energy requested
- degraded beam - the same beam species as the primary beam but at a different (lower) energy and most likely different (higher) charge state
- production target - the target put in place before RAISOR, e.g., Be foil or Gas Cell