WITC
H
e +
WITCHControl System
Michaël Tandecki
&
The WITCH collaboration
S. Van Gorp, E. Traykov , V. De Leebeeck, G. Soti, F. Wauters, N. Severijns (K.U.Leuven),
M. Beck, P. Friedag, J. Mader, C. Weinheimer (Univ. Munster),
F. Wenander, A. Herlert (ISOLDE-CERN) ,
F. Glück, V. Kozlov (FZK Karlsrühe),
D. Zakoucky (NPI-Rez, Prague)
Michaël Tandecki – CS workshop – 19/02/2009
Outline
• WITCH: overview & status• Experimental requirements & hardware• CS implementation• To-do list• Conclusion & Outlook
Michaël Tandecki – CS workshop – 19/02/2009
Outline
• WITCH: overview & status• Experimental requirements & hardware• CS implementation• To-do list• Conclusion & Outlook
Michaël Tandecki – CS workshop – 19/02/2009
Physics principle
- correlation
( ) 1 cos( )v
W ac
22 '
21S S
V
C Ca
C
+
e
Vector
Scalar
5004003002001000
1
0.8
0.6
0.4
0.2
Recoil energy (eV)
VS+
e
e.g. Fermi +-decay
H = CV HV + CA HA + CS HS + CT HT + CP HP
Michaël Tandecki – CS workshop – 19/02/2009
Penning traps
B: radial confinement
E: axial confinement
Michaël Tandecki – CS workshop – 19/02/2009
Retardation spectrometer
%1.19
1.0
0
1
0
1
T
T
B
B
E
Ekin
kin
Energy conversion
Michaël Tandecki – CS workshop – 19/02/2009
Location & overview
~7m
WITCH: Weak Interaction Trap for Charged particles
Status of the experiment
• First retardation spectrum (of 124In) obtained in Nov. 2006
• Run on 35Ar unveiled some new problems
• Work was done to investigate these issues and perform the necessary upgrades
• Nov 2009; second run on 35Ar which showed that all of the upgrades made were successful; low level ionization prevented us from measuring a clean retardation spectrum
Michaël Tandecki – CS workshop – 19/02/2009
spec
tro
met
er
po
ten
tial
(V
)
Michaël Tandecki – CS workshop – 19/02/2009
Outline
• WITCH: overview & status• Experimental requirements & hardware• CS implementation• To-do list• Conclusion & Outlook
Michaël Tandecki – CS workshop – 19/02/2009
Experimental cycle
1. Ejection trigger from REXTRAP
2. Beamgate is triggered for a TOF separation
3. PDT is triggered to pulse down the ions
4. Cooling cycle in the cooler trap
5. Transfer to decay trap
6. Ions are kept in the decay trap for the measurement
7. The DAQ system is allowed to count; retardation power supply and DAQ are synchronized (to have a correspondence between time and retardation voltage)
8. Ions are ejected downwards
0s ~ 100 s ~ 1s ~ 5s
Michaël Tandecki – CS workshop – 19/02/2009
WITCH hardware• Vacuum
– Pfeiffer TPG300 & TPG262– ACT200 & ACT600 (for ATP400 & ATP900 Alcatel turbo pumps)
• Electrode voltages– IKS custom-made (10 channels from -500 to 500V)– ISEG NHQ 234M (2 channels with higher precision – 4kV)– ISEG EHQ F020n (16 channels from 0 to -2kV)– ISEG CPx (separate modules that go to -10kV)
WITCH hardware
• IKS vacuum interlock system• Traps
– IKS Gate & delay generator (2 devices with each 20 channels)– IKS trap supply (32 channels, 4 steps between -15 & 15V)– IKS endcap supply (4 channels, switching between -20 & 450V)
• Excitations (frequency generator)– Stanford Research Instruments DS345– IKS RF switch
Michaël Tandecki – CS workshop – 19/02/2009
WITCH hardware: Gate & Delay Unit
• Early replacement/back-up solution for the PPG100 card (and now permanent)
Michaël Tandecki – CS workshop – 19/02/2009
Advantages
flexible; experimental cycles (e.g. excitations) can be changed easily
Disadvantages
many cables needed
overview of the cycle can be lost
WITCH hardware
• Spectrometer– IKS retardation voltage supply
(in max. 40 steps from 0 to 500V)• Data-acquisition
– WIENER (to read a CAMAC crate; QDC, TDC, scalar)– Ortec MCS-pci (counter with variable time bins)– Tektronix oscilloscope(s)– Keithley electrometer
Michaël Tandecki – CS workshop – 19/02/2009
Miscellaneous
• Thermocouple read-out (Pico technology TC-08)
• Cryostat resistors (for temperature indication)
• Liquid levels
• Magnets power supply
• IKS cross-beam ion source power supply
• Xantrax power supply (for 60kV ion source)
Michaël Tandecki – CS workshop – 19/02/2009
Outline
• WITCH: overview & status• Experimental requirements & hardware• CS implementation• To-do list• Conclusion & Outlook
Situation (of programs) 2 years ago
Separate controls for different devices, on different computers
• HV control (with remote control via VI server)• Timing• Scan.GUI• Oscilloscope
(Easy) operation of the system was only possible thanks to remote desktopping
Michaël Tandecki – CS workshop – 19/02/2009
Computer situation (physically)
Michaël Tandecki – CS workshop – 19/02/2009
Power supplies for the HBL
Pressure gaugesVacuum interlockpower supplies VBL
Trap electronics
Data-acquisition
‘Trap computer’
Computers
Remote control computer
Michaël Tandecki – CS workshop – 19/02/2009
Computer distribution/architecture
WITCH CS server
DNS, DMS server, SQL server, slow monitoring (pressures, temperatures), data server
WITCH traps
RS232 (USB): trap power supplies, timing unitGPIB: frequency generators, scope, electrometer
WITCH slow controls
RS232: pressure gauges, HV supplies
CAN: HV supplies
WITCH DAQ
Ortec & WIENER cards+ GUIs
WITCH internet
Internet gateway+ GUIs
CS device computers, slow controls
CS data (object properties)DAQ dataCS commands
DEVICES
Michaël Tandecki – CS workshop – 19/02/2009
Interfaces: HV control
Michaël Tandecki – CS workshop – 19/02/2009
Interfaces: Trap Control (GADU)
Interfaces: Trap Control (electrodes)
Michaël Tandecki – CS workshop – 19/02/2009
Under c
onstru
ctio
n
(but o
perat
ional
)
Interfaces: Scan.GUI
Michaël Tandecki – CS workshop – 19/02/2009
Under c
onstru
ctio
n
(but o
perat
ional
)
Michaël Tandecki – CS workshop – 19/02/2009
Outline
• WITCH: overview & status• Experimental requirements & hardware• CS implementation• To-do list• Conclusion & Outlook
Michaël Tandecki – CS workshop – 19/02/2009
To-do list
• HV control– add the odd power supply (three electrodes remaining)– polish the instrument drivers
• TrapControl; – Work on the interface for the trap electrodes– Implement an FPGA card?
• Scan.GUI– Polish & finish it
• Use data from CS when taking data (for logging purposes)
• Start using the DSC engine• Tune the basics: CAN communication when restarting the system..
Michaël Tandecki – CS workshop – 19/02/2009
Conclusion & Outlook
• The most important thing for us: it is working• CS gives us more flexibility; every device can be
easily accessed on every computer
• Outlook– Finalizing some of the GUIs– Tune some drivers a bit more– I can tidy up (and make available) some CS
classes (and drivers) if people need it.