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EPICS

 

   

BEST

 User’s Manual 

46 

5.3

 

Controlling the PreDAC output in Open Loop 

In  order  to  control  the 

PreDAC 

in  open  loop,  the  first  operation  is  to  ensure  that  the 

feedback controller is disabled: 

 

 
 
 

 

The 

PreDAC 

output MUX has to be set to 0. This means that the 

PreDAC

 is controlled 

by software (i.e. from the Linux driver through PCIe). 

 

 
 
 

 

Lastly, the user can set the 

PreDAC

 output voltage: 

 

 
 
 

 

The 

PreDAC

 output voltage can be monitored from the 

BEST

 Local User Interface: 

 

Figure 36

: 

BEST

 EPICS controlling 

PreDAC 

output. 

 

 

Содержание BEST

Страница 1: ...1 BEST Beamline Enhanced Stabilization Technology User s Manual All Rights Reserved CAEN ELS s r l Rev 1 7 November 2022 BEAMLINE ELECTRONIC INSTRUMENTATION...

Страница 2: ...This product is compliant CAEN ELS s r l Via Vetraia 11 55049 Viareggio LU Italy Mail info caenels com Web www caenels com...

Страница 3: ...Unit COMP BEI0004 which includes 3 Optical Cables OM2 50 125 m Multimode Duplex DK 2533 10 length 10 m 6 SFP Fiber Optic Transceivers 4 25Gbps 850nm 3 V 3 6 V LC Duplex Pluggable FTLF8524P2BNV The BE...

Страница 4: ...3 1 CONTROLLER SCHEMATIC 22 4 BEST LOCAL GUI 24 4 1 MAIN WINDOW 24 4 1 1 Graph XY 25 4 1 2 Feedback Control Panel 26 4 1 3 PID Configuration Panel 29 4 2 LOGIN 34 4 3 BEAMLINE CONFIGURATION 35 4 3 1 B...

Страница 5: ...2014 Password font corrected 1 1 October 29th 2014 Manual graphics changed 1 2 September 25th 2018 Manual Updated 1 3 October 10th 2019 Added EPICS documentation 1 4 June 3rd 2020 Review of the text...

Страница 6: ...part of the instrument WARNING Do NOT open the boxes CAEN ELS s r l declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the Use...

Страница 7: ...d Before you use the device inspect the instrument for possible cracks or breaks before each use Do not operate the device around explosives gas vapor or dust Always use the device with the cables pro...

Страница 8: ...vironmental requirements for a correct operation of the instrument Environmental Conditions Requirements Operating Temperature 0 C to 45 C Operating Humidity 30 to 85 RH non condensing Storage Tempera...

Страница 9: ...e BEST Central Unit the actuator block i e PreDAC device A simplified block diagram of the BEST architecture is shown in the following figure Figure 1 Simplified architecture of the BEST instrumentati...

Страница 10: ...n this way it is possible to close the control loop and to stabilize the X ray beam The FPGA based hardware architecture allows performing the control algorithms at a maximized speed and with very low...

Страница 11: ...ompact metallic box that can be placed as close as possible to the current source BPM detector in order to reduce cable lengths and minimize possible noise pick up on the weak signals coming from the...

Страница 12: ...such as stabilization intensity monitoring and positioning of the photon beam The FPGA logic receives the acquired X ray data from all TetrAMM devices via a high speed SFP link The received data i e c...

Страница 13: ...physical quantities data i e raw TetrAMM currents beam position and intensity FFT CSP control the beam position with a simple point and click positioning feature or by entering a setpoint manually Re...

Страница 14: ...tandard PreDAC has two voltage output channels but can be optionally upgraded to have three or even four output channels on a single unit It is housed in a light robust and extremely compact metallic...

Страница 15: ...uts in order to prevent any possible damage to the connected units for example the piezoelectric actuators To perform this task please refer to the MIN and MAX Commands of the PreDAC User s manual Pow...

Страница 16: ...sential to determinate position and the intensity of the X ray beam The TetrAMM must be connected with the phBPM using the four analog input connectors placed on the front side of the unit The BNC con...

Страница 17: ...the BNC but uses a very thick and protruding insulator Figure 9 The insulation geometry makes the SHV connector safe for handling high voltage sources by preventing accidental contact with the live co...

Страница 18: ...pacitance and to minimize consequent noise pick up It is also highly recommended to use high quality BNC cables to connect the PreDAC outputs 2 3 BEST Central Unit PC connections The BEST Central Unit...

Страница 19: ...the PreDAC and TetrAMM units there is a dedicated SFP slot providing the communication between the devices and the BEST Central Unit Firstly it is necessary to insert the SFP optics transceiver module...

Страница 20: ...Central Unit Similar as for the TetrAMM and PreDAC devices the SFP optic transceivers should be plugged into the dedicated slots on the rear side of the BEST Central Unit but in this case the correct...

Страница 21: ...s or with a 230 V 50 Hz AC Line e g Europe be sure to select the correct input voltage rating by switching the AC Line Voltage Select switch placed on one side of the box Possible switch positions one...

Страница 22: ...to select which BPM should be assigned to which PID controller An averaging module is placed in between the BPM selector and the PID This module configurable by the user defines the update frequency s...

Страница 23: ...BEST User s Manual BEST Central Unit Overview 23 Figure 15 BEST controller functional overview...

Страница 24: ...e currents first read by the TetrAMMs and then transformed in positions using the usual difference over the sum equations and the BPM scaling parameters see 4 3 for more info Various possible plots ca...

Страница 25: ...edback system What these setting are and where to find them will be clarified in the following sections 4 1 1 Graph XY The Graph XY window in the upper section of the GUI shows the X ray beam position...

Страница 26: ...setpoint The red rectangle always larger than the green one shows the Region Of Convergence ROC i e the area where the PID controller acts on the beam position If in any case the beam position leaves...

Страница 27: ...re 21 which groups all the main feedback control input output parameters The statistics section tab reports mean values and standard deviations of X Y and intensity I0 of the BPM data at the maximum s...

Страница 28: ...tomatically stopped Before starting again the feedback with the Enable feedback button it s necessary to set back the PID status and its output to the initial values this can be done with the Reset Co...

Страница 29: ...he FPGA logic for the BEST fast feedback computation algorithms The BEST system can control and stabilize up to three variables 1 X horizontal position 2 Y vertical position 3 I0 intensity A digital f...

Страница 30: ...eraging is performed on 1000 samples and Real freq will exactly be 100 Hz while if the user selects 90 Hz the average is performed on the closest possible integer number of samples 1112 and Real freq...

Страница 31: ...ier or even to the actuator itself For example piezoelectric actuators often have asymmetric input voltage ranges much wider in a given polarity than in the opposite N B we point out that it is possib...

Страница 32: ...BPM usually in yellow with except for the Currents Graph Tab where and additional graph tab is created for the second BPM 4 1 4 1 FFT Graph Tab The FFT Graph Tab shows the real time FFT of the main ph...

Страница 33: ...BEST User s Manual BEST Local GUI 33 4 1 4 3 DAC Graph Tab 4 1 4 4 Position Graph Tab 4 1 4 5 Intensity Graph Tab...

Страница 34: ...s WeAreTheBest User mode does not allow changing the beamline related settings but provides authorization to change setpoints and feedback parameters and configuration Username for this mode is user a...

Страница 35: ...hBPM system on the right A quick overview of the available beamline configuration options are represented in the following sections 4 3 1 Beam Position Monitor The BPM Beam Position Monitor section al...

Страница 36: ...eamline either intrinsically with a different geometry e g diamond based phBPM or with the phBPM system rotated CW by 45 in order not to get shadowed by the first unit upstream Then the computation ne...

Страница 37: ...re 27 Figure 27 ROC ROI Settings window The Region of Convergence ROC is the maximum area where the PID controller stabilizes the beam to a certain setpoint If for any reason the beam position goes ou...

Страница 38: ...intensity goes back to values above the set threshold Please note the difference between the stop condition if the ROC input fields are checked that fully freezes the feedback loop when the beam posit...

Страница 39: ...Configuration the user can change the TetrAMM reading range gain Available options are 0 higher current range and 1 lower current range 4 3 SFP Info The SFP Info window which is accessible from Settin...

Страница 40: ...amplitude generated by the PreDAC is swept through a pre defined frequency range and in parallel the system response is read by the TetrAMM and analyzed by the Central Unit The Frequency Analysis Too...

Страница 41: ...BEST User s Manual BEST Local GUI 41 Figure 31 Frequency analysis tool window...

Страница 42: ...github platform It is based on the functionalities offered by the BEST library that is part of the BEST software suite and constantly updated with new features An API reference manual of the BEST lib...

Страница 43: ...43 5 1 EPICS IOC Integration Start the BEST Local User Interface Figure 32 Run the BEST Local User Interface In order to start the EPICS server double click the BEST EPICS IOC application framed in b...

Страница 44: ...ICS server will return the EPICS server shell Figure 33 Run the BEST EPICS server The system shows that the procedure is completed therefore EPICS control is allowed Figure 34 BEST EPICS server initia...

Страница 45: ...side assuming EPICS is correctly installed the user has access to all the commands available e g caput caget camonitor etc 5 2 BEST login using EPICS As for the BEST Local User Interface also EPICS re...

Страница 46: ...e that the feedback controller is disabled The PreDAC output MUX has to be set to 0 This means that the PreDAC is controlled by software i e from the Linux driver through PCIe Lastly the user can set...

Страница 47: ...implemented in FPGA logic performs all the calculations in order to get the X Y positions or intensity to the user defined setpoint The user must firstly ensure that the PreDAC output is driven by ha...

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