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 Nov 26 17:13:45 2018

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On 24/11/2018:

At 8:35 the chamber pressures read (mBar):

<ul>
	<li>TPU1 = 2.2</li>
	<li>TPU2 = 2.2</li>
	<li>TPD1 = 2.2</li>
	<li>TPD2 = 2.0</li>
	<li>CHUP = Sensor Off</li>
	<li>CHDW = No Sensor</li>
</ul>

The chamber was vented and the CH2 XV target replaced with new ones.

See picture 1 for target ladder after dismounting - the beam spot from 7Li is clearly visible on CH2 XV.

The target ladder configuration is now:

<table border="1" cellpadding="1" cellspacing="1" style="width:500px">
	<tbody>
		<tr>
			<td>Target #</td>
			<td>Target</td>
		</tr>
		<tr>
			<td>1</td>
			<td>Blank 3mm Aperture</td>
		</tr>
		<tr>
			<td>2</td>
			<td>Blank 10mm Aperture</td>
		</tr>
		<tr>
			<td>3</td>
			<td>CH2 XVI (840 +/- 40 ug/cm^2)</td>
		</tr>
		<tr>
			<td>4</td>
			<td>CH2 XVIII (820 +/- 40 ug/cm^2)</td>
		</tr>
		<tr>
			<td>5</td>
			<td>natC III (590 ug/cm^2)</td>
		</tr>
		<tr>
			<td>6</td>
			<td>CH2 XX (880 +/- 40 ug/cm^2)</td>
		</tr>
		<tr>
			<td>7</td>
			<td>CH2 XIX (890 +/- 40 ug/cm^2)</td>
		</tr>
	</tbody>
</table>

See picture 2 for the new configuration.

The target ladder was remounted and at 9:15 the chamber pumped down. The far S2 still has the 12um mylar protective foil.

By 9:30 the pressures read (mBar):

<ul>
	<li>TPU1 = 4.6e-5</li>
	<li>TPU2 = 7.4e-6</li>
	<li>TPD1 = 6.8e-6</li>
	<li>TPD2 = 8.7e-6</li>
	<li>CHUP = Sensor Off</li>
	<li>CHDW = No Sensor</li>
</ul>

The Far S2 was biased to -130V, leak I = 1.38 uA. The diode biased to -70V, leak I = 0.00uA

A beam of 7Li 2+ 4.0MeV was focused onto the target position.

After focussing, FC4 = 260 pA, FCA = 250 pA. Both of these faraday cups are before the target chamber.

After focussing with the 10mm aperture, FCC = 195 pA. Focussing with the 3mm aperture, FCC = 190 pA. Faraday cup C (FCC) is after the target chamber.

A spectrum was collected for 7Li 4.0MeV

Run # 181124101041

<ul>
	<li>Run time: 717s</li>
	<li>Pulser ON, 25 Hz, as before</li>
	<li>Target: CH2 XVI</li>
	<li>Beam: 4.0 MeV 7Li 2+</li>
	<li>Trigger rate: 3285/s</li>
	<li>DT ~ 6%</li>
</ul>

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