| Status |
ExpNbr |
Date |
Author |
Type |
Category |
Target-Source |
Subject |
| Fixed | e755 |
Sun Jun 24 22:13:30 2018 |
valérie, daisuke | RUN | General | Cryo-empty | RUN 106 empty target run |
Run 106 Trigger: MUST2 all
start @ 21h31; stop @21h44
e748 Exxx 168154021 24 juin 21:44 /data/e748X/e755/acquisition/run/run_0106.dat.24-06-18_21h31m26s |
| Fixed | e738 |
Mon Jul 16 11:22:26 2018 |
thomas, daisuke | RUN | General | N/A | RUN 416 |
CATS1 pulser calibration. trigger CATS1.
Attenuation 1/1, 1/2, 1/4, 1/5, 1/10 and pedestal.v |
| Fixed | e738 |
Mon Jul 16 11:23:55 2018 |
thomas, daisuke | RUN | General | N/A | RUN 417 |
CATS2 pulser calibration. trigger CATS2.
Attenuation 1/1, 1/2, 1/4, 1/5, 1/10 and pedestal. |
| Fixed | e755 |
Wed Jun 27 21:25:41 2018 |
takeshi, shunpei | TARGET | Hardware | Cryo-LH2 | temperature log during liquefying |
Here is the temperature log before and during liquefying.
The temperature trend seems almost same as previous. |
| Fixed | e738 |
Fri Jul 13 06:02:31 2018 |
takeshi, pierre | TARGET | General | Cryo-LH2 | target is half filled |
We found the liquid hydrogen target is filled only half during the run 368, around 4:10.
We will continue the measurement for now. |
| Fixed | e755 |
Mon Jul 2 14:37:44 2018 |
takeshi, didier, olivier | RUN | General | Cryo-LH2 | RUN 229 |
RUN 229
Ca37 + liq. H2
Beam is back 14h30
14h30 started
14h49 stopped due to ion source problem |
| Fixed | e755 |
Mon Jul 2 15:18:21 2018 |
takeshi, didier, olivier | RUN | General | Cryo-LH2 | RUN 230 |
RUN 230
37Ca + liq. H2
15h11 started
beam was about 2 uA until 15h20, recovered to 4 uA after that. |
| Fixed | e755 |
Mon Jul 2 10:12:29 2018 |
takeshi, didier | RUN | General | Cryo-LH2 | RUN225 |
RUN 225
37Ca beam + liq. H2 target
10h02 started
12h00 stopped |
| Fixed | e755 |
Sat Jun 30 23:47:45 2018 |
takeshi, daisuke, didier | BEAM | General | Cryo-LH2 | result of Wien filter tuning |
Here is the summary of the tuning of the Wien filter.
We tried to tune the correction magnet of the wien filter to change the Y position of the beam, especially for 37Ca, which seemed to be at slightly higher position.
The peak position was shifted lower and lower and the purity of 37Ca was increased as changing the magnetic field of the wien filter with decreasing total beam rate.
The rate of 37Ca was actually not changed by the tuning of the wien filter and 36K was decreased by this tuning, although the rate of 35Ar, which are not interest nuclide for us, was decreased significantly.
The dead time of DAQ is not so serious in current setting, so we decided to continue the measurement without changing the wien filter. |
| Fixed | e738 |
Sun Jul 15 01:35:09 2018 |
takeshi, Valérie | ONLINE | General | N/A | problem of the beam image on vigru |
The beam image at the target is not clear on online monitor.
We have confirmed that the target is correctly evacuated to empty now (and fully filled before that) by offline. |
| Fixed | e755 |
Mon Jul 2 12:09:56 2018 |
takeshi, Didier, olivier | RUN | General | Cryo-LH2 | RUN 226 |
RUN 226
37Ca + liq. H2
12h03 started
13h27 stopped because the beam stopped |
| Fixed | e738 |
Sun Jul 8 09:14:18 2018 |
takeshi, Didier, Valérie | RUN | General | Cryo-LH2 | RUNS 288-290 |
RUN 288
10C + liq H2
start 08h56 stop 10h56
Run 289 start 10h56 stop 12h52
Run 290 start 13h18 stop 13h36
|
| Fixed | e755 |
Sat Jun 30 16:04:11 2018 |
takeshi, Didier | RUN | General | Cryo-LH2 | run 197 |
RUN 197
start: 15h39
stop : 17h38
beam rate 1.7 uA |
| Fixed | e755 |
Sat Jun 30 17:45:17 2018 |
takeshi, Didier | RUN | General | Cryo-LH2 | run 198 |
RUN 198
start: 17h40
stop : |
| Ongoing | e755 |
Sun Jun 17 11:12:57 2018 |
takeshi | TARGET | Hardware | N/A | current cooling status of the cryogenic target |
This is the temperature log of the cryogenic hydrogen target during the cooling test done last night.
The temperature of the heat shield (green line) and the cell (blue line) increased while it went the minimum values at once.
We could not try liquefying test this morning because the temperature was not enough low.
I would attach the boiling points of several gases in a vacuum. We suspect the rebound of the temperature is due to adsorption of vapour such as N2 at 20 K and H20 at 150 K. |
| Fixed | e755 |
Sun Jun 17 11:25:31 2018 |
takeshi | TARGET | Hardware | N/A | current cooling status of the cryogenic target |
This is the temperature log (temperaturelog.png) of the cryogenic hydrogen target during the cooling test done last night.
The temperature of the heat shield (green line) and the cell (blue line) increased while it went the minimum values at once.
In addition to the overall behaviour, a narrow peak was found (peak,png) in the cell temperature which anti-correlate to that of the heat shield. We consider this is due to the contact between the cell and the heat
shield.
We could not try liquefying test this morning since the temperature was not enough low.
I would attach the boiling points of several gases in a vacuum (boilingpoinnt.png). We suspect the rebound of the temperature is due to adsorption of vapour such as N2 at 20 K and H20 at 150 K. |
| Fixed | e755 |
Thu Jun 21 18:52:42 2018 |
takeshi | TARGET | Hardware | N/A | target temperature |
Here I attached the temperature graph which is daisuke discussed at the meeting.
Both the heat shield (blue line) and the cell (green) increase after the minimum at 8 hours.
They had a second minimum at 21 hours and now they are increasing. |
| Fixed | e755 |
Fri Jun 22 03:11:51 2018 |
takeshi | VACUUM | Hardware | N/A | the vacuum pressure and the target temperature |
We suspect the impurity of the vacuum causes the rebound behavior of the target temperature.
Here is the data of the vacuum level v.s. the target temperature as it increasing.
As Daisuke explained at the meeting, we are monitoring two point as temperature reference, the cell (A) and the heat shield (E).
The detail discussion is still ongoing. |
| Fixed | e755 |
Fri Jun 22 13:45:22 2018 |
takeshi | TARGET | Hardware | N/A | target temperature status |
I would report the temperature log of the target up to now.
We started cooling the target at 2:21 last night.
The attached file is the temperature graph. The black lines are the today and the other colors are for reference. The thicker line is the heat shield and the thiner line is the cell. Note the time offset is adjusted by about 1 hours, to match the blue reference line (Wednesday data).
Both the cell and the heat shield show the same behavior as Wednesday up to now. |
| Fixed | e755 |
Sat Jun 23 00:39:33 2018 |
takeshi | TARGET | Hardware | N/A | target temperature |
Here is the target temperature up to now. The black lines are today, and bule lines are reference.
The thicker line is for the heat shield and the thinner is for the cell.
Once we reached flat region at 15 hours, and but got a sudden increase of cell temperature at 19.5 hours. |