| <p>Run 41 started.</p>
<p>D+ beam deuterium target. D+ beam energy is 0.75 MeV/u. (beam calc calculation is 0.7619 MeV/u). See previous entry for beamcalc.</p>
<p>Beam calc - Attachment 1</p>
<p>Target density is about 3e12 at/cm2</p>
<p>All four detectors positioned fully out and stationary.</p>
<p>Left potentiometer = 18.86 mm</p>
<p>Right potentiometer = 19.8 mm</p>
<p>Ring cycle time is 25 seconds. Note we see some hydrogen in in the spectrum, this disapears after a few seconds.</p>
<p>Target T1=30.0K, T2=31.9K.</p>
<p>Nozzle position x=-2.96, z=1.72 mm</p>
<p>YR09-Etarget pressure = 2.0e-10 mbar.</p>
<p>Cooler set value = 439 V, 15 mA. Read value = 439.81 V, 12.88 mA</p>
<p>All leakage currents look good</p>
<p>Beam position. Vertical =0.0mm , Horizontal=-1.5 mm</p>
<p>Beam intensity ~3e8 on bunched beam, 3e8 on coasting. Gleb has increased the intensity this morning.</p>
<p>Data rate ~ 403kB/s</p>
<p>Lowered slow comparator threshold to 0x24 (360 keV)</p>
<p>13:20 Run stopped</p>
<p>Wolfgang tuning next beam energy</p>
<p>All checks fine</p>
<p>Total stats: 7827,4085,1821</p>
<p>OFFLINE CHECK</p>
<p>I have check Run41 and applied the gain calibration from 2024 in addition to a tigher EyEx energy cut (600 keV from 3 MeV for the online script). We no longer see the larger hump to the side of the 3He peak in DSSD1. See final attachment for comparison.</p>
<p>Note no time cuts have been applied to this spectra.and a more rigourous gain calibration using the igher energy D+ runs will likely improve things further. </p> |