View source for Detailed Steps for Tuning In-Flight Beams

= Overview of the steps for In-flight beam delivery =
Once steps for degraded beam tuning have been completed, a good focus is found at the RAISOR midplane, and the tune on the target has been completed, the following guide should be consulted.

# '''Acquire information on primary/degraded beam tunes and prep for beam'''
## Ask for docs from operations on primary and degraded beam TOFs and the charge state and slit scan data to be loaded into BOX
## 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

# '''Getting 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) + RAISOR Att if needed
## 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
## ''Run the RAISOR midplane slits in to 2 - 3 mm gap and take another spectrum (better to have small slit spacing for BRho scans)''

# '''Determine the RF Sweeper(R501)/R401 phases for degraded beam with known TOF'''
## Set primary degraded beam rate to few hundred Hz and get Grafana running
## Have operations turn on Sweeper to Voltage=2 and phase=0 to start (R401 is still off)
### Note: You already may see a reduction in the beam rate do not increase beam current to get back to few hundred Hz
## Set the increment step = 1 degree, operators hold down increment to scan over 360 noting the phase every 10 - 20 degree
## ''Document the phase that transmission is the highest for the primary degraded beam''
## Do smaller steps of ~1 degreed around the regions of the maxima (should be two that are similar one <180 one >180 deg)
## Leave Sweeper(R501) at optimal phase, increase amplitude to 3,4,5,6V to see if improvement in transmission, note the best value.
## Set Sweeper (R501) to optimal phase/amplitude
### ''FYI: Phase B is the number that ops has been typically used when referring to the phase''
## Turn on R401 to phase = 0, amp ~ 1.1 or 1.2 (below 0.9 seems to give it issues locking up)
## First scan phase, then scan amplitude similar to Sweeper to find optimal R401 parameters, note the values.
## '''TURN OFF THE SWEEPER AND R401 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 and optimal scale factor'''
## Have a good degraded beam spot in the detectors (SCALE = 1.0), w/ RF Sweeper and R401 OFF
### Best to have RAISOR slits set to 2 - 3 mm spacing only (typically they are 5 - 7 mm after RAISOR Proc.)
### This can be done either with low primary beam on FCA001 or higher beam and RAISOR x100 or x1000 in (just document)
## ''Input current beam line values into ATLAS RAISOR Scaler Tool (make sure it is for the appropriate beam line)''
## Incrementally scale the RAISOR / beam line magnets in 0.5-1% steps (up or down depending) 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
### Generate cuts at each step to track the movement of the beam charge states etc. if needed
### 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 the secondary beam'''
## Set beam of interest to optimal scale factor
## '''Put max current on FCA001 and RAISOR att in if needed (essentially as close to primary beam maximum on target as possible)'''
## '''Carry out procedure for optimizing the RF Sweeper and R401 as described above [Determine the RF Sweeper(R501)/R401 phases for degraded beam with known TOF]'''
### There are a few options at this step:
#### The RAISOR midplane slits may be opened to 5 - 7 mm gap if the purity is good enough prior to the phase scans
#### Otherwise, the slits may be opened after finding the optimal settings for the secondary beam to see if rates are increased
#### Finally, if secondary beam rate is too low relative to the total rate for a manual scan, we can calculate the expected phase and search nearby this theoretical value
## '''Leaving the Sweeper / R401 settings at the optimal values, provide rates / purities etc. to operators for optimizing on the total rate'''
### Keep track of primary beam current at various points through tuning, RAISOR POC needs to help determine with discussions on ops/user sides when to stop tuning
## '''Once rates have been achieved, move to any other optimizations, i.e. beam spot etc.'''

# Document and Monitor
## Note down RAISOR settings when needed
## Keep track of gas-cell temp pressure when applicable
## ...

<!-- # Tune primary beam w/ RAISOR OFF to time-of-flight, check [define this] and record
# Insert production target APETURE and focus primary beam on production target with SOLENOID
# Turn on RAISOR DIPOLE MAGNETS, set to predefined starting fields [??]
# Insert the RAISOR MIDPLANE CUP
## Use cups before and after production target
## Check for current on MIDPLANE CUP as well
# Insert the required production target
# Tune degraded beam w/ RAISOR OFF to time-of-flight, check [define this] and record
# Set RAISOR MIDPLANE SLITS to XXX (top) and XXX (bottom)
# Tune the degraded beam THROUGH RAISOR to RAISOR MIDPLANE CUP
# Optimize the degraded beam tune on the MIDPLANE CUP
## Clear the RAISOR MIDPLANE SLITS
## Periodically carry out ''slit scans'' to determine the midplane focus
## Looking to obtain a symmetric Gaussian distribution
## The FWHM of the peak is dependent upon the beam / target combination, usually want less than 1-3 mm FWHM
# Continue degraded beam tune to RAISOR EXIT -->
<!--  # If development - follow steps XXX - XXX, if experiment - skip to step XXX --->

= 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