 Sat Feb 26 22:22:27 2022, David, Pierre-Michell, Starting to take data 11x
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At 23:22 we started recording data under the new conditions.
Merger, Tape server (WS3): 1408 kB/s writing ok
Leakage current (WS4): 3.27 uA |
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Sat Feb 26 23:20:13 2022, David, Pierre-Michell, Update status 7x
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In this last hour we have been playing with the cryostat temperature as dictated by Nikos, in order to have the target working properly. For this, we
have increased from 80K to 140K the cryostat temperature then we saw again target until we didn't. Then we went down again to 80K. After a few minutes,
with a really nice target again was gone, so we increased the temperature to 120K at 00:19. At 00:27 decrease from 120K to 80K. |
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Sun Feb 27 00:07:15 2022, David, Pierre-Michell, No beam, valve closed
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At 00:37 we lost the beam due to a high pressure burst in the tarjet which resulted in a valve closed at YR09VV...
On-call service technicians are coming to solve the problem.
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Sun Feb 27 00:53:24 2022, David, Pierre-Michell, Current status 7x
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We have recovered the beam at 01:49, after such a long time we had no target so we increased from 80K to 120K at 01:52. 02:01 update 120K-->95K as
we have observed around that temperature always fluctuations and is safer.
Ring current 7.74e7 particles/s |
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Sun Feb 27 01:46:56 2022, David, Pierre-Michell, Current status
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So far looks like with a temperature of 95K the target is maintained with a reasonable density throughout long periods of time.
Ring current 6.41e7 particles/s
Merger, Tape server (WS3): 1472 kB/s writing fine |
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Sun Feb 27 02:38:52 2022, David, Pierre-Michell, Current status
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We have decreased the temperatur> 95K --> 90K. At 95K the target was stable, but let's try to increase the density a bit.
Edit 03:54 : 90K --> 85K
Merger, Tape server (WS3): 1300 kB/s writing ok |
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Sun Feb 27 03:49:36 2022, David, Pierre-Michell, Current status
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04:06 85K -->120K : 04:13 120K -->95K
current ring 8e7 p/s
Merger, Tape server (WS3): 1600 kB/s, writing/refreshing ok |
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Sun Feb 27 04:54:46 2022, David, Pierre-Michell, Current status
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Ring current 8e7 particles/s
Merger, Tape server (WS3): 1664 kB/s writing ok
Leakage current (WS4): 3.26 uA |
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Sun Feb 27 05:45:53 2022, David, Pierre-Michell, Current status
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6:05: 95K-->120K
6:12: 120K --> 95K
Ring current 8e7 particles/s |
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Tue Mar 1 22:10:26 2022, David, George, Current status
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Ring current 6.67e7 particles/s
pressure at S1: 2.3-2.8e-8
Merger, Tape server (WS3): 1574 kB/s, writing ok |
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Tue Mar 1 23:30:04 2022, David, George, Current status
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00:30
Pressure in S1 slightly decreased from before but still high enough to measure data.
One new count at 20MeV |
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Tue Mar 1 23:43:15 2022, David, George, Beam Intensity Drop
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00:38
Intensity in the ring dropped by 2 orders of magnitude to 5e5 on injection
Lost rutherford rate (as seen in last e-log post) |
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Wed Mar 2 01:24:48 2022, David, George, Ion Source Update
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02:25
Zoran was unable to ignite the ion source.
He has given some parameters to the control room so they can wiggle stuff around and try and ignite it. |
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Wed Mar 2 03:40:40 2022, David, George, Temperature Cycle
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04:40
Target density is hovering between 2.0e-8 and 2.3e-8, sometimes dipping below 2.0e-8
We will conduct a temperature walkthrough while there is no beam, |
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Tue Feb 22 17:32:38 2022, David, Current status 12x
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Michael is modifying the settings of the electron cooler --> changed beam from bunched to coasting
Merger, Tape server (WS3) checks: DONE, writing ~1036 kB/s, refreshing is fine
Leakage current (WS4): 3.46 uA , stable current |
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Tue Feb 22 19:11:18 2022, David, Current status
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Still trying to recover previous pressures, more details in the next entry.
Merger, Tape server (WS3) checks: DONE, writing ~1030 kB/s, refreshing is fine
Leakage current (WS4): 3.46 uA , stable current |
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Tue Jun 4 00:04:39 2024, DR, EH, Run 31
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Beam energy = 3 MeV
Horizontal beam position = 4.0 mm, vertical beam position = 0.0 mm.
Beam intensity at inj ~ 2.5e7 |
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Thu Jun 6 05:44:45 2024, DR YL DB LB CB JM, Run 38 - 15N Tests 8x
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06:45
All system checks OK
Target density 3.4e11 |
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Tue Jun 4 06:56:02 2024, DFF, PC, LB, JM,NP,AB, Run 31 contd
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8:13
Since 6:40 the target density dramatically dropped to 10^9 since then it has been unstable and did not recover. Currently it is around 8e8.
09:00 |
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Wed Feb 23 19:22:55 2022, CN, TD, check 10x
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- Motor checked , OK
SW3 |