ELOG CIRCE

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

CIRCE

Fields marked with * are required

Entry time:

Sun Feb 25 15:59:38 2018

Author*:

Subject*:

On 23/02/2018 at 13:49 we started the DAQ in list mode.

After starting the DAQ we sent the 3.45MeV 7Li beam onto the CH2 930ug/cm2 target III.

The trigger rate ~ 2kHz, event multiplicity = 6.1, dead time ~ 9%.

The DAQ save file is: /Remote_Objs/RData_1/180223135345

Checking the ADC rate histograms:

<ul>
	<li>ADC 2 Channels 0-&gt;7 Rate ~ 1e3 (channels 0 and 5 still disabled)</li>
	<li>ADC 2 Channel 8 dead</li>
	<li>ADC 2 Channels 9-&gt;31 Rate ~ 1e4 - 1e5</li>
	<li>ADC 4 Channels 0-&gt;15 Rate ~ 1e3</li>
	<li>ADC 4 Channels 16 -&gt; 29 and 31 Rate ~ 1e4 - 1e5</li>
	<li>ADC 4 Channel 30 dead</li>
	<li>ADC 6 Channel 31 Rate ~ 8e5</li>
</ul>

Picking an S2 backstrip at random we found a proton detection rate ~ 100Hz, no high rate beam scatters were seen, as expected from the thick target. We decided to run for several hours.

We performed occasional checks during the run:

<table border="1" cellpadding="1" cellspacing="1" style="width:500px">
	<tbody>
		<tr>
			<td>Runtime (hh:mm:ss)</td>
			<td>ADC # / Ch #</td>
			<td>Area in region</td>
			<td>Ratio to pin diode (ADC 6)</td>
		</tr>
		<tr>
			<td colspan="1" rowspan="3">01:01:00</td>
			<td>2/20</td>
			<td>183850</td>
			<td>61.47</td>
		</tr>
		<tr>
			<td>6/31</td>
			<td>2991</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>4/24</td>
			<td>262051</td>
			<td>87.61</td>
		</tr>
		<tr>
			<td colspan="1" rowspan="3">01:30:37</td>
			<td>2/20</td>
			<td>269255</td>
			<td>61.49</td>
		</tr>
		<tr>
			<td>6/31</td>
			<td>4380</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>4/24</td>
			<td>377251</td>
			<td>82.94</td>
		</tr>
		<tr>
			<td colspan="1" rowspan="3">02:03:22</td>
			<td>2/20</td>
			<td>362581</td>
			<td>58.07</td>
		</tr>
		<tr>
			<td>6/31</td>
			<td>5987</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>4/24</td>
			<td>501628</td>
			<td>77.40</td>
		</tr>
		<tr>
			<td colspan="1" rowspan="3">02:30:34</td>
			<td>2/20</td>
			<td>437224</td>
			<td>57.86</td>
		</tr>
		<tr>
			<td>6/31</td>
			<td>7277</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>4/24</td>
			<td>600118</td>
			<td>76.35</td>
		</tr>
		<tr>
			<td colspan="1" rowspan="3">03:19:02</td>
			<td>2/20</td>
			<td>561345</td>
			<td>53.80</td>
		</tr>
		<tr>
			<td>6/31</td>
			<td>9584</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>4/24</td>
			<td>765584</td>
			<td>
			71.72
			</td>
		</tr>
	</tbody>
</table>

Where the area regions used (in channels) for each ADC Channel are:

ADC 2 Ch 20: 0-&gt;552

ADC 6 Ch 31: 1302-&gt;1475

ADC 4 Ch 24: 20 -&gt;549

The ratios use the number of counts since the previous check. The ratios are decreasing as expected, because this indicates that fewer protons are being detected during the irradiation time.

At 17:08 the DAQ was stopped at runtime 03:19:02

The DAQ monitor dead time ~ 5%. Event multiplicity ~ 6.0, # Good events = 23917715.

We checked the beam current before the chamber, FC-E0 ~ 190pA.

&nbsp;

See attached &quot;180223_S2FrontStrip_ADC2CH20.png&quot; for sample front S2 strip spectrum

See attached &quot;180223_S2BackStrip_ADC4CH24.png&quot; for sample back S2 strip spectrum

See attached &quot;180223_PinDiode_ADC6CH31.png&quot; for sample pin diode spectrum

Encoding: HTML ELCode plain
Suppress Email notification Resubmit as new entry

Attachment 1:

180223_S2FrontStrip_ADC2CH20.png Original size: 1514x802

Attachment 2:

180223_S2BackStrip_ADC4CH24.png Original size: 1514x802

Attachment 3:

180223_PinDiode_ADC6CH31.png Original size: 1514x802

Attachment 4:

Drop attachments here...

ELOG V3.1.4-unknown