Proton beam acceleration for PIXE analysis(Nov. 4 2020)

12:20

• RF source on

• Set PRB VC to 3.5 kV

• Set EXT VC to 4 kV

12:56

• Accelerator on at 1.3 MV

• beam current at FC01-1 ~ 100 nA

• beam current at FC02-1 ~52 nA (see attachment 1) and quite stable

13:10

• Adjust beam spot ~0.6x0.4 cm2

• Beam current at FCB1-1: ~9.7 nA ( see attachment 2)

• Start PIXE run 3143

• Start PIXE run 3142

13:53

• Start PIXE run 3144

• Beam current at FCB1-1 decrease to ~8.9 nA (see attachment 3)

15:49

• Run 3145 ended

• Beam current continue to decrease to ~7.2 nA

• Try to increase MV S2-1 a bit (from 1.7 to 1,9E-6 T) beam current increased to 8,4 nA and stable.

• Run 3146 started

17:09

• Run 3151 stop

• It’s been 4 hours since accelerator started. It has been operated non-stop at Terminal voltage of 1.3 MV. No problem.

• Attachment 4: beam and accelerator condition

• Chiller temperature at 19.8 degree C. Room temperature 20 degree, humidity 60 %. All 4 air conditioners are On and set at 21 degree C.

• Keep running accelerator until ion source shut down.

17:27

• Accelerator off

Attachment 1 Attachment 2 Attachment 3 Attachment 4