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

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

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"

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. 

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.

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 

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. 

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

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  

since shortly after 7 AM we have no beam in the ESR
(reason unclear) 

Both DAQs also crashed. 

Beam back in ESR at 7:20 or so 

Problems with restarting DAQ1 

Problems with restarting DAQ2 

Files names 7801 and 7804 and 0047 and 0050 cannot be used

we had no injections in the ESR again 

it turned out that the injection kicker of the ESR has a problem 

The MesyTec Shaper & Constant Fraction (MSCF) is used to process the PMT/det signals for the ADC in the second DAQ.
It can be setup on its front panel, but single channel setup is very tedious.
Remote control of the settings is possible using an epics server and client.

All of the following is done with the "litv-exp" user:

server: atpnuc001 (in the screen session "E142")
client: lxg1275 

The server should run undisturbed, but in case of a power failure, you can start the server like this:
> ssh litv-exp@atpnuc001
> cd e142
> ./E142_start_ioc.sh

To check server:
> ssh litv-exp@atpnuc001
> screen -x (CTRL-a CTRL-d to leave screen)

To connect the client gui for remote control, do:
> ssh litv-exp@lxg1275
> E142_epics
The panel is more or less self-explaining. 
One thing has to be noted: the Monitor Channel selection is shifted by -1.
I.e., [ch 1] is button [0], etc.

The MSCF settings can be stored and loaded to/from file by using a bash-script.
The settings will be saved/loaded from: 
/u/litv-exp/e142/mscf_settings/
files names are "setting_e142.<linux_timestamp>"

The scripts are also in /u/litv-exp/e142/mscf_settings/
use 
./mscf_save.sh                   for saving the current settings to a new file
use 
./mscf_load_last.sh              to load the last settings file (by timestamp in the filename) 
use 
./mscf_load_file.sh <filename>   to load the settings of a specific file

The additional signals from PMTs and XUV detector needed for spectroscopic analysis in the second DAQ are patched to AP Messhütte (MH) via the red patch panel at the inside of the target region. The patch channels F1 to F8 (also labeled A to H in red on white) are used and extended by a cable bundle to reach below the mirror chamber. Inside the MH the signals arrive at the red patch panel and are forwarded to the blue patch panel close to the laser DAQ using channels 1 to 8 (also labeled A to H).
 
The entire connection for these 8 channels from the mirror chamber to the blue panel has been tested with a pulser signal of ~115mV amplitude. After transfer the amplitude has decreased to ~40mV, see also attached fotos.

The signal transport time from the mirror chamber to the blue panel is ~407 ns. This was measured by patching a logic puls from ESR to MH and back to ESR, as show in the delay_ESR... foto attached.  

newest version V2 - valid since Mo 04.April 2022

Beam settings:
primary beam 
copper stripper
I_el=300mA
U_el=205.490kV (Ohm_labs)
3.5e7 ions at injection


MSCF/ADC settings: 
ch2 < Mid PMT x10
ch6 < Mid PMT x100
see attachment (setting_e142....) for detailed MSCF settings

Files/Runs [DAQ2]:

------------------new file-----------------
229Th0022.lmd
bunched beam [ESR in manip. at 7]
beam scraped using detector drives
-SA pos: 0
-NA pos: -10
-Ni pos: 40

no corresponding file in DAQ1

------------------new file-----------------
229Th0023.lmd
bunched beam [ESR in manip. at 7]
beam scraped using detector drives
-SA pos: 0
-NA pos: -10
-Ni pos: 40
laser scan active:
- steps: 21
- cycles: 5

file in DAQ1:
...7768.lmd

------------------new file-----------------
229Th0024.lmd
bunched beam [ESR in manip. at 7]
beam scraped using detector drives
-SA pos: out (-127)
-NA pos: -10
-Ni pos: 40
laser scan active:
- steps: 21
- cycles: 5

file in DAQ1:
...7770.lmd

------------------new file-----------------
229Th0025.lmd
bunched beam [ESR in manip. at 7]
beam scraped using detector drives
-SA pos: 0
-NA pos: -10
-Ni pos: 40
laser scan not:

VUPROM -> delay stop trigger ch12 

file in DAQ1:
no file

no laser scan

------------------new file-----------------
229Th0026.lmd
bunched beam [ESR in manip. at 7]
beam scraped using detector drives
-SA pos: 0
-NA pos: -10
-Ni pos: 40
laser scan active:
- steps: 21
- cycles: 5

VUPROM -> delay stop trigger ch12 

file in DAQ1:
...7772.lmd