ELOG CIRCE

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

CIRCE

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Entry time:

Mon Dec 3 16:17:29 2018

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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

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

Set ladder to position #5 - natC III

Note: now saving to /Local_Parts/PartODF/

Run # 181126163853

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

Moved ladder to position #2 - blank 10mm aperture

Run # 181126164509

<ul>
	<li>Run time: 67s</li>
	<li>Pulser ON, as before</li>
	<li>Target: Blank 10mm</li>
	<li>Beam: 3.0MeV 7Li 2+</li>
</ul>

Still see scattered beam at low S2 strips #&#39;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&#39;t show higher rates compared to other channels (eg ADC 1 CH10)

Moved ladder to position #7 - CH2 XIX

Run # 181126183711

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

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Attachment 1:

181126164509_ADC1_24.png Original size: 756x403

Attachment 2:

181126183711_ADC1_Ch9.png Original size: 756x403

Attachment 3:

181126183711_ADC3_Ch16.png Original size: 756x403

Attachment 4:

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