We saw a jump in the E-cooler voltage at about 7:50. 
jump from 209619 to 209610 V 

At 7:56 it jumped back to 209619 V
seems stable now  

Der Strahl ist wieder im ESR! 
Angeblich war einen Schlitz, oder sogar 2, reingefahren worden. 
Es könnte entweder der GEEXDR11S und/oder den GEEXDR1AS  gewesen sein. 

Wir haben jetzt folgende Parameter: 

SIS Injektionsenergie = 537.5 MeV/u  (haben wir nicht geändert) 
Chopper window 70 us (nicht geändert) 

Wir haben jetzt etwa 1.2e9 Ionen pro Injektion im ESR

And now also in English :) 

The ion beam is back in the ESR! 
Apparently, there was a slit moved in. (Maybe even 2)

This could have been GEEXDR11S and/or the GEEXDR1AS 

We now have the following parameters: 

SIS injection energy = 537.5 MeV/u  (we did not change this) 
Chopper window 70 us (we did not change this) 

We now have about 1.2e9 ions per injection in the ESR

The problem - "discovered" by Volker and Ken - of the high dark countrate of the Cu PMT has been solved. 

(when the Cu mirror was moved in, the dark countrate was very high ... also without ion beam) 

I asked Graziano Savino to check the vacuum gauges along the target side of the ESR (west side). 
The gauges at the laser window sections (which we do not use here!) - NW and SW - were still on. 
Volker remembered that, in the past, for the lowest dark countrate at the Cu PMT --> ALL GAUGES MUST BE SWITCHED OFF. 
Graziano turned them off and Sebastian and I checked the Cu PMT rate in DAQ1. 

Attached you can clearly see the difference: from 7500 cps to 400 cps. 

When the Cu mirror is retracted the dark countrate is 200 cps.  

Danyal

PS The slow increase in one plot is due to the fact that Graziano switched on the light in the ESR. 

We checked again the cables for both DAQs 
(on Carsten's kind request) 


Channels for both DAQs are: 

0 XUV-Back 
1 XUV-Anode 
2 XUV-Anode-delayed 
3 PMT-South (new PMT, new threshold)
4 PMT-Middle 
5 PMT-North 
6 PMT-Cu 
7 Part-det-south 
8 Part-det-north 
9 - 
10 - 
11 - 
12 - 
13 PD-NO
14 PD-SO
15 Q-switch 

Regina noticed that the ESR was "red" 

This means that there are some errors. 

She found: 
 
correction fields in the dipoles were off

GE01KP02 ... 05
GE01KP22 ... 24 

and some correction elements were off 

GE02KX6 
GE01KX2 


Regina would like to know since WHEN this is the case. 

In general, such errors affect the ion beam trajectory ! 

Regina will try to find out more details on how this may have shifted the orbit.

This afternoon, we found out that Sergey has also implemented a "target bump". 
Although we do not use a target, this bump is still convenient because 
we can move the ion beam such that is passes perfectly through the Cu mirror. 

The setting is -8 mm and 1.3 mrad  (if I am not mistaken) 
We tested the effect on the position of the ion beam using the 
horizontal scrapers at the target: GEEXDS1HA and GEEXDS2HA. 

With the target bump set to "zero" (0 mm and 0 mrad), 
the ion beam passed 6-8 mm to the outside. 
This way, it will e.g. not pass centrally through the slit in the Cu mirror. 


With the target bump set to -8 mm and 1.3 mrad, which is the default setting, the ion beam passed centrally. 
Therefore, we left the target bump like this. 

I stopped the NTCAP data acquisition at 8 AM.

Let's hope that the file contains good data.

The ESR is "blue" again. 

The errors (scu related) have been fixed. 

In principle, normal operation should be possible. 

After the morning meeting Regina will return to the main control room. 

I guess that we continue at 10 AM. 

I have replaced the PMT south (looks at the gas target). 
in the hope that this will produce less dark counts. 
Thus far, the dark countrate is low (few Hz). 

brand: ET enterprises 
type:  2" photomultiplier, 9423B 
High voltage: -2.45 kV  (up to -3.5 kV) 
spectral range: 110 - 230 nm 

The power comes from an additional 2.5 kV supply. 
(I have changed the cable: was CH0 before) 

10:17 
Wie heutemorgen in der Sitzung (morning briefing) vereinbart, 
führt Herr Florenkowski einen Interlock und danach einen Reset von E02MK durch. 
Das dauert nur ca. 15 min. 

nach dem interlock wurde der ESR "rot" 

Um 10:21 war das problem gelöst und der ESR war wieder "blau"

After changing to h=1
The frequency manipulation #5: f=242.021487MHz (124th harmonic) [no bunching]
Manipulation #7: f=242.021812 MHz [with bunching]

Ecooler failed @15:23 Carsten is fixing it
Fixed @16:00