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 17:02:48 2018

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On 27/11/2018:

Started tuning for 1.5MeV 6Li 1+. Set ladder to position #2 - Blank 10mm. Far S2 iris closed.

Run # 181127151653

<ul>
	<li>Run time: N/A</li>
	<li>Pulser ON, as before</li>
	<li>Target: Blank 10mm</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
</ul>

Moved ladder to position #5 - natC III

Run # 181127152055

<ul>
	<li>Run time: N/A</li>
	<li>Pulser ON, as before</li>
	<li>Target: natC III</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
	<li>DAQ Crashed</li>
</ul>

Restarted FAIR DAQ

Run # 181127153422

<ul>
	<li>Run time: N/A</li>
	<li>Pulser ON, as before</li>
	<li>Target: natC III</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
	<li>Run stopped incorrectly by user</li>
</ul>

Run # 181127153506

<ul>
	<li>Run time: 489s</li>
	<li>Pulser ON, as before</li>
	<li>Target: natC III</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
</ul>

Run # 181127155040

<ul>
	<li>Run time: 187s</li>
	<li>Pulser ON, as above</li>
	<li>Target: natC III</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
</ul>

Moved ladder to position #3 - CH2 XVI

Run # 181127155607

<ul>
	<li>Run time: 908s</li>
	<li>Pulser ON, as above</li>
	<li>Target: CH2 XVI</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
	<li>DT ~ 15%</li>
</ul>

Struggling to see beam in diode for all of these past runs.

Opened iris to use far S2 as diagnostic tool - beam is stopped in thick CH2 targets so detector is safe even at its small angular coverage (~5 - 15 degrees)

Run # 181127161508

<ul>
	<li>Run time: 14s</li>
	<li>Pulser ON, as before</li>
	<li>Target: CH2 XVI</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
</ul>

No high rate seen

Run # 181127161656

<ul>
	<li>Run time: 194s</li>
	<li>Pulser ON, as before</li>
	<li>Target: CH2 XVI</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
	<li>DT ~ 12%</li>
</ul>

Still struggling to see beam on diode

Found lemo cable used for diode timing between CFD and Logic OR has exposed cabling -&gt; replaced lemo. See attached picture 1 for old lemo.

Run # 181127163416

<ul>
	<li>Run time: 106s</li>
	<li>Pulser ON, as before</li>
	<li>Target: CH2 XVI</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
</ul>

Far iris opened

Run # 181127163848

<ul>
	<li>Run time: N/A</li>
	<li>Pulser ON, as before</li>
	<li>Target: CH2 XVI</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
</ul>

Realised we were making a mistake when looking at the DAQ spectra. We were looking at ADC 2 (labelled as 3 on DAQ file browser) channel 16 (an S2 back strip) when we should have been looking at ADC 3 (labelled as 4 on DAQ browser) channel 16 for the diode

Closed iris, checked beam current. Using 10mm aperture FCC = 1pA.

Opened iris, moved ladder to position #3 - CH2 XVI

Run # 181127164749

<ul>
	<li>Run time: 556s</li>
	<li>Pulser ON as before</li>
	<li>Target: CH2 XVI</li>
	<li>Beam: 1.5MeV 6Li 1+</li>
</ul>

Ready to mount thin CH2 target.

At 16:55: Far S2 bias = -130.0V, leak I = 1.75uA. Diode bias = -70.1V, leak I = 0.00uA.

Pressures (mBar):

<ul>
	<li>TPU1 = 9,2e-7</li>
	<li>TPU2 = 3.4e-7</li>
	<li>TPD1 = 6.4e-7</li>
	<li>TPD2 = 6.8e-7</li>
	<li>CHUP = Sensor Off</li>
	<li>CHDW = No Sensor</li>
</ul>

Switched off detector biases, switched off preamps. Closed FCC valve. Closed line valve. Turbos off. T1600 backing and manual valves closed. Ecodry 1 and 2 off.

Vented chamber. Mounted thin target CH2 50 ~ 50mm from Far S2 - see attached picture 2.

Left 0.9um mylar in front of far S2.

Remounted far S2 and far preamp. With detectors on in air trigger rate ~ 9kHz.

19:00 Ecodry 1 and 2 on. Started opening manual valve.

19:15 pressures below 10 mBar, manual valve fully opened. T1600 backing valve opened. Turbos on.

19:25 Pressures (mBar):

<ul>
	<li>TPU1 = 3.2e-5</li>
	<li>TPU2 = 8.1e-6</li>
	<li>TPD1 = 6.0e-6</li>
	<li>TPD2 = 8.3e-6</li>
	<li>CHUP = Sensor Off</li>
	<li>CHDW = No Sensor</li>
</ul>

Far S2 biased to - 130.0V, leak I = 1.52uA. Diode biased to -70.1V, leak I = 0.00uA.

Closed iris, set ladder to position #2 - blank 10mm

See 1 -&gt; 2 pA beam on FCC, opened iris ready for measurement.

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