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.