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 17:59:48 2018

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On 28/11/2018:

After pulser walkthrough (see eLog entry #67)

Dismounted targets from ladder - see picture 1 and 2 for upstream and downstream sides respectively

Mounted alpha source on ladder - see pictures 3 and 4 for upstream and downstream sides respectively

New target ladder configuration is now:

<table border="1" cellpadding="1" cellspacing="1" style="width:500px">
	<tbody>
		<tr>
			<td>Target Position</td>
			<td>Target</td>
		</tr>
		<tr>
			<td>1</td>
			<td>Blank 3mm</td>
		</tr>
		<tr>
			<td>2</td>
			<td>Blank 10mm</td>
		</tr>
		<tr>
			<td>3</td>
			<td>Nothing</td>
		</tr>
		<tr>
			<td>4</td>
			<td>Alpha-Source</td>
		</tr>
		<tr>
			<td>5</td>
			<td>Nothing</td>
		</tr>
		<tr>
			<td>6</td>
			<td>Nothing</td>
		</tr>
		<tr>
			<td>7</td>
			<td>Nothing</td>
		</tr>
	</tbody>
</table>

Dismounted thin CH2 target 50 - it was still attached to the collimator.

Remounted far S2 with 0.9um mylar, remounted far iris arm.

In air, pressures (mBar):

<ul>
	<li>TPU1 &gt; 1000</li>
	<li>TPU2 &gt; 1000</li>
	<li>TPD1 = 170 (above range)</li>
	<li>TPD2 = 73 (above range)</li>
	<li>CHUP = Sensor Off</li>
	<li>CHDW = No Sensor</li>
</ul>

Far S2 biased to -130.0V, leak I = 1.55uA. Diode biased to -70.1V, leak I = 0.01uA.

Ratemeter ~9200Hz.

Switched off detectors.

12:05 Ecodry 1 and 2 on. Started opening manual valve.

12:20 Manual valve opened fully, T1600 backing valve opened. Started turbos.

12:30 Pressures (mBar):

<ul>
	<li>TPU1 = 3.0e-5</li>
	<li>TPU2 = 5.1e-6</li>
	<li>TPD1 = 5.1e-6</li>
	<li>TPD2 = 7.5e-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 = 0.01uA.

Rate meter ~ 7000Hz. Ladder set to position #4 - alpha source. Rate meter still ~ 7000Hz.

Run # 181128123940

<ul>
	<li>Run time: 3428s</li>
	<li>Pulser ON, as before</li>
	<li>Alpha-source</li>
	<li>S2 mylar: 0.9um</li>
	<li>DT ~ 22%</li>
	<li>See attached picture 5 for sample Far S2 front strip spectrum</li>
</ul>

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