AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
CARME
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Entry time:
Sun Jun 1 15:33:50 2025
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<p>16:30</p> <p>Run 40 started.</p> <p>D+ beam deuterium target. D+ beam energy is 0.75 MeV/u. (beam calc calculation is 0.7619 MeV/u)</p> <p>Beam calc - Attachment 1</p> <p>Target density is about 1e12 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 30 seconds. Note we see some hydrogen in in the spectrum, this disapears after a few seconds.</p> <p>Target T1=30.1K, T2=31.9K.</p> <p>Nozzle position x=-2.96, z=1.72 mm</p> <p>YR09-Etarget pressure = 2.55e-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 ~1e8 on bunched beam, 1e7 on coasting. This is less intensity than higher energies, may require an increase in the morning. </p> <p>Data rate ~ 403kB/s</p> <p>Lowered slow comparator threshold to 0x24 (360 keV) since we decreased beam energy.</p> <p>18:36</p> <p>Temps OK - attached</p> <p>Rates OK - attached</p> <p>Merger OK - attached.</p> <p>Spectra appear to have a flat background to the right of Rutherford that was not there at higher energies.</p> <p>The xy plot also does not seem to be as centered.</p> <p>21:17</p> <p>Tems OK</p> <p>Stats OK</p> <p>Merger OK</p> <p>Leakage current stable</p> <p>Run continues OK</p> <p>Ring vacuum 2E-10 mbar, likely getting less target.</p> <p> </p> <p>02:00</p> <p>Temps OK</p> <p>Stats OK</p> <p>Merger OK</p> <p>Leakage current OK</p> <p>Run continues - attached</p> <p>Ring vacuum as before</p> <p> </p> <p>04:20</p> <p>Temps OK</p> <p>Stats OK</p> <p>Merger OK</p> <p>L. current stable</p> <p>Run continues</p> <p>Ring vacuum as before</p> <p>07:00</p> <p>All checks OK</p> <p>Leakage currents remain stable.</p> <p>We have accumulated good statistics. 3He peak does seem a bit off. Cooling could be slightly off. Problem is not so bad looking at Ey compared to Ex. Online code uses pulser calibration only so may be a bit off depending on Ey/Ex.</p> <p>Target density has been stable in the 1e12-2e12 at/cm2 range overnight. A bit more would be good.</p> <p>Will ask on call operator to check cooling and try to increase intensity.</p> <p>Run stopped gas target off.</p> <p>07:30</p> <p>Note during the tuning process we observed the same structure at 2.5 MeV in DSSD 1 as we did overnight that may overlap with the 3He peak. Perhaps it can be removed offline. See final attachment</p> <p> </p>
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Attachment 1:
Screenshot_from_2025-06-01_16-38-55.png
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Attachment 2:
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