AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
CIRCE
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<p> <table width="98%" align="center" cellspacing="1" style="border:1px solid #486090;"> <tbody> <tr> <td cellpadding="3px" style="background-color:#486090; font-weidht:bold; color:white;">Quote:</td></tr> <tr> <td cellpadding="10px" style="background-color:#FFFFB0;"><p>On 24/11/2018:</p> <p>After the short test with 4.0MeV 7Li (see eLog #55) the beam was tuned for 4.0MeV 7Be 2+.</p> <p>Run # 181124103943</p> <ul> <li>Run time: 43s</li> <li>Target: CH2 XVI</li> <li>Beam: 4.0MeV 7Be 2+</li> <li>Comment: Far S2 iris was closed!</li> </ul> <p>Run # 181124104408</p> <ul> <li>Run time: 3971s</li> <li>Pulser ON, as before</li> <li>Target: CH2 XVI</li> <li>Beam: 4.0MeV 7Be 2+</li> </ul> <p>After this run we checked the beam current:</p> <p>FC4 = 10pA</p> <p>Using 10mm aperture FCC = 4.5pA, using 3mm aperture FCC = 4.0pA</p> <p>Attempted to increase beam current by adjusting bending magnet - optimum: 413.30mT</p> <p>Run # 181124120558</p> <ul> <li>Run time 7930s</li> <li>Pulser ON, as before</li> <li>Target: CH2 XVI</li> <li>Beam: 4.0MeV 7Be 2+</li> </ul> <p>See attached picture 1 for a sample spectrum from the S2 front strip. See attached picture 2 for the diode spectrum - the peaks from 7Be and 7Li are visible. Recall the diode has a 0.9um mylar protective foil in front of it.</p> <p>Run # 181124141834</p> <ul> <li>Run time: 3362s</li> <li>Pulser ON, as before</li> <li>Target: CH2 XVI</li> <li>Beam: 4.0MeV 7Be 2+</li> </ul> <p>Further attempts to increase beam current, ioniser increased from 24.0 -> 24.5A. FC4 = 15pA</p> <p>Run # 181124154345</p> <ul> <li>Run time: 3609s</li> <li>Pulser ON, as before</li> <li>Target: CH2 XVI</li> <li>Beam: 4.0MeV 7Be 2+</li> </ul> <p>Checked beam current: using 10mm aperture FCC = 4pA (time: 16:44)</p> <p>Decreased oven temperature -> FC4 = 16pA</p> <p>Run # 181124165221</p> <ul> <li>Run time: 4221s</li> <li>Pulser ON, as before</li> <li>Target: CH2 XVI</li> <li>Beam: 4.0MeV 7Be 2+</li> </ul> <p>Collected background using carbon target:</p> <p>Run # 181124180623</p> <ul> <li>Run time: 463s</li> <li>Pulser ON, as before</li> <li>Target: natC III</li> <li>Beam: 4.0MeV 7Be 2+</li> </ul> <p>Beam current seemed unstable, run stopped, no actions taken. FCC ~ 5pA.</p> <p>Run # 181124182304</p> <ul> <li>Run time: 3647s</li> <li>Pulser ON, as before</li> <li>Target: natC III</li> <li>Beam: 4.0MeV 7Be 2+</li> </ul> <p>See attached picture 3 for a sample spectrum from the S2 front strip. The spectrum indicates hydrogen contamination is present on the carbon foil. See attached picture 4 for the diode spectrum.</p> <p>After run: checked beam current. FC4 = 18pA. Using 10mm aperture FCC = 5.5pA.</p> <p>Leaving for the night:</p> <p>Far S2 leak I = 1.87uA. Far S2 and diode biases off.</p> <p>19:25 pressures (mBar):</p> <ul> <li>TPU1 = 1.4e-6</li> <li>TPU2 = 3.7e-7</li> <li>TPD1 = 7.0e-7</li> <li>TPD2 = 6.6e-7</li> <li>CHUP = Sensor Off</li> <li>CHDW = No Sensor</li> </ul></td> </tr> </tbody> </table> </p><p> </p>
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