AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40
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Message ID: 710     Entry time: Sun Jun 1 15:33:50 2025
Author: EW, JM, CB 
Subject: Run 40 

16:30

Run 40 started.

D+ beam deuterium target. D+ beam energy is 0.75 MeV/u. (beam calc calculation is 0.7619 MeV/u)

Beam calc - Attachment 1

Target density is about 1e12 at/cm2

All four detectors positioned fully out and stationary.

Left potentiometer = 18.86 mm

Right potentiometer = 19.8 mm

Ring cycle time is 30 seconds. Note we see some hydrogen in in the spectrum, this disapears after a few seconds.

Target T1=30.1K, T2=31.9K.

Nozzle position x=-2.96, z=1.72 mm

YR09-Etarget pressure = 2.55e-10 mbar.

Cooler set value = 439 V, 15 mA. Read value = 439.81 V, 12.88 mA

All leakage currents look good

Beam position. Vertical =0.0mm , Horizontal=-1.5 mm

Beam intensity ~1e8 on bunched beam, 1e7 on coasting. This is less intensity than higher energies, may require an increase in the morning. 

Data rate ~ 403kB/s

Lowered slow comparator threshold to 0x24 (360 keV) since we decreased beam energy.

18:36

Temps OK - attached

Rates OK - attached

Merger OK - attached.

Spectra appear to have a flat background to the right of Rutherford that was not there at higher energies.

The xy plot also does not seem to be as centered.

21:17

Tems OK

Stats OK

Merger OK

Leakage current stable

Run continues OK

Ring vacuum 2E-10 mbar, likely getting less target.

 

02:00

Temps OK

Stats OK

Merger OK

Leakage current OK

Run continues - attached

Ring vacuum as before

 

04:20

Temps OK

Stats OK

Merger OK

L. current stable

Run continues

Ring vacuum as before

07:00

All checks OK

Leakage currents remain stable.

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.

Target density has been stable in the 1e12-2e12 at/cm2 range overnight. A bit more would be good.

Will ask on call operator to check cooling and try to increase intensity.

Run stopped gas target off.

07:30

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

 

Attachment 1: Screenshot_from_2025-06-01_16-38-55.png  114 kB  Uploaded Sun Jun 1 16:39:03 2025  | Hide | Hide all
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