Transcript
Electron-Muon Ranger start-up guide EMR operation quick guide v1.1 Fran¸cois Drielsma September 8, 2015
1
Contents 1 Electron-Muon Ranger hardware
3
2 Operate the VME crate 2.1 Locally . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Through telnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 6 6
3 Operate the Low Voltage PSU 3.1 Locally . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 Through telnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 8 8
4 Operate the High Voltage PSU 10 4.1 Via web browser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5 Data taking 11 5.1 DAQ initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.2 Data quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2
1
Electron-Muon Ranger hardware
The Electron-Muon Ranger (EMR) is a fully-active tracking-calorimeter that forms part of the MICE PID system and tags muons that traverse the cooling channel without decaying. Figure 1 shows one plane of the EMR, consisting of 59, tessellated, triangular scintillator bars covering an area of 1.21 m2 . Alternate planes are rotated through 90◦ with respect to the previous one, such that a pair of planes defines a horizontal and vertical (X,Y) interaction coordinate. Light produced by a particle interaction is collected by the wave-length shifting (WLS) fibre within each bar and is read out at both ends. On one side of the plane, the 59 fibres are bundled together and brought to a conventional single-anode photo-multiplier tube (SAPMT) and on the other side the fibres are individually brought to one of the pixels on a 64-channel multi-anode photo-multiplier tube (MAPMT). The full detector, consisting of 48 planes, is shown in figure 2 installed in the MICE Hall for the upcoming ‘Step IV’ beam line. It is enclosed on all sides to ensure a light-tight environment and is magnetically shielded from the cooling cell.
Figure 1: CAD drawing of one EMR plane (top) and cross section of 3 bars and their threaded WLS fibres (bottom).
Figure 2: The EMR detector installed in the MICE Hall for the upcoming ‘Step IV’ beam line.
The 48 SAPMT signals are read out by six 8-channel flash ADC (fADC). The 64 signals of each MAPMT are shaped by dedicated Front-End Boards (FEB) that measure the charge in a channel in terms of their Time-over-Threshold (ToT)1 . The ToT and the time stamp of each signal are stored in Digital Buffer Boards (DBB). The 48 FEBs are configured by three custom made VME Configuration Board (VCB) and read out by eight 6-channel VME Readout Boards (VRB). The fADCs, VRBs and VCBs are placed in a single CAEN A8160 VME crate with a v2718 and a v977. The voltage in the 96 PMTs of the detector is provided by a single rack mounted CAEN SY4527 High Voltage Power Supply Unit(HVPSU) with six 24-channel modules. The HVPSU provides a tension of 1500 V to the SAPMTs and 700 V to the MAPMTs. The EMR rack also accommodates two CAEN SY8800 Low Voltage Power Supply Units (LVPSU). The first one, LVPSU1, provides power to the Fan-Out Boards (FOBs), the internal fans and the LED pulser. The second one, LVPSU2, provides power to the FEBs and DBBs through three separate channels. The additional elements of the EMR rack are an oscilloscope, a spare single-channel LVPSU, a NIM crate and several patch panels. All of the devices of the rack are connected to as single, remote-controlled, 12-socket High Amp Metered & Switched PDU. Each individual channel can be remotely turned ON or OFF and the total current can be monitored. 1 The time-over-threshold is defined as the width of the low threshold discriminator signal. This signal width, larger for signal with larger amplitudes, depends on the particle’s energy loss.
3
Figure 3: Layout of the EMR rack (in the MICE hall). The IP addresses are written on the left hand side of the devices connected to the MICE network.
4
Figure 4: Location of the EMR rack in the MICE hall 5
2
Operate the VME crate
2.1
Locally
If the hall is in free access, the easiest way to turn the VME crate on is to flip the switch on the front panel of the VME crate located as shown in figure 5.
Figure 5: VME crate front panel connectors and switches
2.2
Through telnet
To connect to the VME crate and turn it on remotely, open a terminal on a MICE net computer and execute the following telnet commands:
$ t e l n e t 1 7 2 . 1 6 . 2 4 6 . 2 1 2 8100 Trying 1 7 2 . 1 6 . 2 4 6 . 2 1 2 . . . Connected t o 1 7 2 . 1 6 . 2 4 6 . 2 1 2 . Escape c h a r a c t e r i s ’ ˆ ] ’ . $ caen
This will open the following control page:
##### ## ## ####### ## ## ## ##
##### ## ## ##### ## ## #####
C .A. E .N.
A8160 VME8100 Crate C o n t r o l l e r
B O A R D
## #### ## ## ####
##### ## ###### ## ## #####
M E N U
Crate General Update
PS & Fan S t a t u s General Status Firmware Update
Quit
Abandon program
6
##### ## ## ## ## ## ## ##### V1 . 0 1
S e l e c t Item
Press C and hit the < CR >, this prompts:
C .A. E .N.
A8160 VME8100 Crate C o n t r o l l e r
V1 . 0 1
PS AC S t a t u s PS VCC S t a t u s
OK OK
PS Temperature
30 Deg
Fan1 Fan2 Fan3
OK OK OK
FU Temperature
25 Deg
2850 Rpm 2850 Rpm 2940 Rpm
VSet +5V +12V −12V
05.00 V 12.00 V 12.00 V
ISet 110.00 A 023.00 A 023.00 A
OvP
UvP
05 % 05 % 05 %
05 % 05 % 05 %
On/ O f f Crate [ON] Reset Alarm
VMon
IMon
05.02 V 12.00 V 12.00 V
+ Fan Speed
040.00 A 001.25 A 002.05 A
− Fan Speed
Status Ok Ok Ok Quit
You can now press O and hit < CR > to turn on the VME crate (repeat the operation to turn it off). Press Q and < CR > to exit the page and repeat to exit the main menu. To leave telnet, follow this procedure:
1. Press < Ctrl > + ] 2. Type quit and hit < CR >
7
3
Operate the Low Voltage PSU
3.1
Locally
If the hall is in free access, the easiest way to turn the LVPSU crates on is to flip their switches on the front panels of the LVPSU crates located as shown in figure 6.
Figure 6: LVPSU front panel connectors and switches
3.2
Through telnet
To connect to one of the LVPSU crates and turn it on remotely, open a terminal on a MICE net computer and execute the following telnet commands:
$ t e l n e t 1 7 2 . 1 6 . 2 4 6 . 2 1 3 8100 $ t e l n e t 1 7 2 . 1 6 . 2 4 6 . 2 1 4 8100
( f or LVPSU 1 ) ( f or LVPSU 2 )
Trying 1 7 2 . 1 6 . 2 4 6 . 2 1 3 . . . Connected t o 1 7 2 . 1 6 . 2 4 6 . 2 1 3 . Escape c h a r a c t e r i s ’ ˆ ] ’ . $ caen
This will open the following control page:
##### ## ## ##### ##### ##### ##### ## ## ## ## ## ## ## ## ## ## ## ##### ## ##### ##### ## ## ## ## ## ## ## ## ## ## ## ## ## ## ##### #### ##### ##### ##### ##### C .A. E .N. SY8800 U n i v e r s a l M u l t i c h a n n e l Low V o l t a g e PS V1 . 0 1 B O A R D Crate
M E N U Crate S t a t u s
8
General Map I /O Update
General Status Channels Map E x t e r n a l I /O S i g n a l s Firmware Update
Quit
Abandon program
S e l e c t Item
Press C and hit the < CR >, this prompts:
C .A. E .N. SY8800 U n i v e r s a l M u l t i c h a n n e l Low V o l t a g e PS V1 . 0 1 PS AC S t a t u s PS VCC S t a t u s
OK OK
VSet CH0 CH1 CH2 CH5 CH6
05.00 −07.00 −20.00 +12.00 +20.00
A l l Ch ON
PS Temperature CTR Temperature
ISet V V V V V
002.00 004.20 001.00 004.00 001.40
A l l Ch OFF
VMon A A A A A
04.97 07.01 20.00 12.01 00.00
43 Deg 34 Deg
IMon V V V V V
More
000.10 000.08 000.28 003.12 000.00
Pw A A A A A
Reset Alarm
Status
On Off On On Off
Ok Ok Ok Ok Ok
Quit
You can now press O and hit < CR > to turn off the power supply to all channels (press F and hit < CR > to turn it off). Press Q and < CR > to exit the page and repeat to exit the main menu. To leave telnet, follow this procedure:
1. Press < Ctrl > + ] 2. Type quit and hit < CR >
9
4
Operate the High Voltage PSU
The HVPSU cannot be operated locally. The crate itself should always be on, even after a power outage. If it is impossible to access the crate remotely, please check that the crate switch is set on ”local” as shown in figure 7.
4.1
Via web browser
To access and turn on the PMT high voltages, follow these steps 1. Open a web browser on a MICE net machine and type 172.16.246.207 in the address bar; 2. Use admin as a user name and password, hit login (figure 8); 3. Select Channels Controller (figure 9); 4. Press Click to start CAEN HVPSS ChannelsController (figure 10); 5. Open the JNLP file with IcedTea Web Start (figure 11); 6. Power individual channels ON/OFF by selecting the corresponding Pw cell and hitting < CR > (figure 12);
Figure 7: HVPSU crate front panel switches
Figure 8: Login page of the HVPSU web access
Figure 9: Main menu of the HVPSU web access
Figure 10: Submenu of the HVPSU web access
10
Figure 11: Download window for the JAVA client
5
Figure 12: EMR channel controller
Data taking
5.1
DAQ initialization
To guarantee the operational status of the VME boards dedicated to the EMR, it is necessary to initiate the DAQ arming sequence. The DAQ will configure the 48 FEBs and arm the VRBs, VCBs and fADCs, checking that they are operating properly.
5.2
Data quality
During data taking, check the online reconstruction plots to make sure that the EMR is acquiring good data. The DAQ could arm normally without guaranteeing the acquisition of reconstructible data. The absence of current in the PMTs, for instance, would not be signalled during DAQ arming. The online plots should be similar to the plots shown in figure 13, i.e. • Check that the digits are reconstructed and that they are no obvious dead planes in the XZ, YZ and Z beam profiles (even planes in XZ and odd planes in YZ); • Check that the spacepoints are reconstructed in the XY beam profile; • Check that the PID variables are reconstructed and non zero, i.e. EMR range, charge, charge ratio, normalised χ2 and plane density, ρP .
11
Figure 13: EMR online reconstruction plots 12
