Cyclotron Beam Development
May 19, 2020
Beam lines availability
- BL2C4: 100 uA
- BL1B: 20 nA
- BL2A: 0 uA
Schedule
8:30 to 09:30 -- Document cyclotron beam characteristics
Involved: Operators.
- Before starting make sure RF booster is OFF.
- Take LE1, LE2, HE1 and HE2 scans (PSU: LE1, LE2, HE1, and HE2) with circulating current ~300 nA,
bunchers OFF, WITHOUT pepper pot, with gain set to 100 nA for the LE probes and 1 uA for HE1, and
running at fast speed for all the probes.
9:30 to 11:00 -- Lock up and get ready for sending beam to BL1B
Involved: Operators
- Lock up 1A, TNF and M20 Cave
- Load last years' 480 MeV 1B tune.
- Send a few nA of beam down BL1B.
11:00 to 14:00 -- Setup 1B for various energies
Involved: Yi-Nong Rao
From where: e-linac side of the driver control room.
- Setup BL1B for the standard 480 MeV tune.
- Setup a 357 MeV tune, starting from the tune used on December 15, 2017.
- From this low energy tune, try to develop even lower energy tune. The limit of the extraction probe is
180 MeV.
14:00 to 15:00 -- Coupling resonance
Involved: Yi-Nong Rao
From where: e-linac side of the driver control room.
- Reproduce results from June 17 last year.
15:00 to 20:00 -- Initial Beam Properties in BL1A
Inolved: Thomas Planche
From where: e-linac side of the driver control room.
- Setup beam to monitor 2.5, which has its own beam dump.
- Try again vertical imaging of the foil, which was not successful last year, probably because of the
jagged shape of the foil edge.
- Take enough data for a tomographics reconstruction of the vertical emittance.
20:00 to 22:00 -- ISIS model testing
Involved: Thomas Planche
From where: ISIS console, upstairs.
- Finish the work started last Friday: load a couple of test tunes (one for testing matching to the periodic section, and the other to test the possibility to clip vertical tails on collimator 061).
Risk/Hazard analysis
- We expect to take a couple of HE and LE scans, which means moving the probes many times with more wear
on the probes. We shall minimize the probe movement by choosing carefully the ranges of the different
scans and limit the number of scans to a reasonable minimum.
- We will run high current in the machine for part of the shift. The risks are not different from routine
high current Operation.
- I need to add some consideration about setting up beam to BL1V monitor 2.5, which has not been attempted for a long time.
- COVID-19: Yi-Nong and Thomas will follow recommendations from the Lab Director. We will work at a safe
distance from Operators: Yi-Nong will work alone in the e-linac side of the driver control room
(Operator(s) will be present on the cyclotron side of the driver control room). Thomas will work alone
from the ISIS terminal upstairs. Yi-Nong and Thomas will be wearing a facial covering.