On 26/11/2018, after changing the far S2 mylar foil (see previous eLog entry #60):

Checked pulser frequency on oscilloscope: 19.31Hz

Began tuning 3MeV 7Li 2+.

After tuning, FC4 = 1nA. Using 10mm aperture FCC = 313pA. Using 3mm aperture FCC = 250pA.

Ladder set to position #7 - fresh C2 XIX target. Far S2 iris opened.

Run # 181126162248

• Run time: 753s
• Pulser ON, as before
• Target: CH2 XIX
• Beam: 3.0MeV 7Li 2+
• DT ~ 18%

Set ladder to position #5 - natC III

Note: now saving to /Local_Parts/PartODF/

Run # 181126163853

• Run time: 73s
• Pulser ON, as before
• Target: natC III
• Beam: 3.0MeV 7Li 2+
• DT ~ 20%
• Observe 7Li passing through target

Moved ladder to position #2 - blank 10mm aperture

Run # 181126164509

• Run time: 67s
• Pulser ON, as before
• Target: Blank 10mm
• Beam: 3.0MeV 7Li 2+

Still see scattered beam at low S2 strips #'s - see attached picture 1 for spectrum of the innermost S2 strip.

Performed further beam tuning to improve transmission.

After tuning: Using 10mm aperture FCC = 415pA (280 - 420pA). Using 3mm aperture FCC = 290pA.

Moved ladder to position #3 - CH2 XVI. Bombarded target with 3.0MeV 7Li 2+ and checked rate histogram on FAIR DAQ. ADC1 CH24 didn't show higher rates compared to other channels (eg ADC 1 CH10)

Moved ladder to position #7 - CH2 XIX

Run # 181126183711

• Run time: 616s
• Pulser ON, as before
• Target: CH2 XIX
• Beam: 3.0MeV 7Li 2+
• DT ~ 14%
• See attached picture 2 for sample S2 front strip spectrum. See attached picture 3 for diode spectrum.