1. Target Status Report Lara Howlett University of Sheffield

2. Lara Howlett – University of Sheffield Frascati, June 2005 Contents A look at the specs A look at the specs Reminder of Prototype plans Reminder of Prototype plans Meetings with ISIS engineers Meetings with ISIS engineers Testbeam plans Testbeam plans Status of electronics, readout and radiation studies Status of electronics, readout and radiation studies Plans / Timescale Plans / Timescale

3. Lara Howlett – University of Sheffield Frascati, June 2005 Updated Specs Frequency 1-3 Hz. Higher may be possible but we may be limited by heating Frequency 1-3 Hz. Higher may be possible but we may be limited by heating Target will dip into the beam by 5-10mm Target will dip into the beam by 5-10mm Only the intersection of the beam in the last 1ms is useful Only the intersection of the beam in the last 1ms is useful We wish to intersect as little beam that is not useful as possible We wish to intersect as little beam that is not useful as possible

4. Lara Howlett – University of Sheffield Frascati, June 2005 Updated Specs 4.4mm 2.05ms

5. Lara Howlett – University of Sheffield Frascati, June 2005 Updated Specs 7.4mm 2.75ms

6. Lara Howlett – University of Sheffield Frascati, June 2005 Updated specs 9.8mm 3.35ms

7. Lara Howlett – University of Sheffield Frascati, June 2005 Overview of Prototype The prototype is currently being built and is expected to be ready by the end of the month The prototype is currently being built and is expected to be ready by the end of the month The design consists of a a magnetic shuttle to which the target rod is attached The design consists of a a magnetic shuttle to which the target rod is attached This sits inside a series of coils which are driven in 3 phase This sits inside a series of coils which are driven in 3 phase

8. Lara Howlett – University of Sheffield Frascati, June 2005 Prototype ~8 cm

9. Lara Howlett – University of Sheffield Frascati, June 2005 Target Mechanism

10. Lara Howlett – University of Sheffield Frascati, June 2005 Meetings with ISIS Several very useful meetings have taken place with engineers from ISIS Several very useful meetings have taken place with engineers from ISIS These have been very useful for beginning to look at These have been very useful for beginning to look at –Safety issues –Vacuum issues –How the target mechanism will be mounted A first set of engineering drawings have also been produced by Stephanie Yang A first set of engineering drawings have also been produced by Stephanie Yang

11. Lara Howlett – University of Sheffield Frascati, June 2005 Outcomes The diaphragm springs will most likely be replaced by ceramic bearings The diaphragm springs will most likely be replaced by ceramic bearings The target will be mounted on a replacement for the current A frame to reduce vibrations transmitted to the beam pipe by the target The target will be mounted on a replacement for the current A frame to reduce vibrations transmitted to the beam pipe by the target The possibility of replacing the inductive measurement system with an optical system is under investigation The possibility of replacing the inductive measurement system with an optical system is under investigation The possibility of mounting the target using nested bellows with a gate valve which would allow the target to be completely removed from the beam in case of failure is being investigated The possibility of mounting the target using nested bellows with a gate valve which would allow the target to be completely removed from the beam in case of failure is being investigated

12. Lara Howlett – University of Sheffield Frascati, June 2005 Schematic

13. Lara Howlett – University of Sheffield Frascati, June 2005 Status of Electronics The electronics consists of two separate integrated circuits The electronics consists of two separate integrated circuits –Control logic –Current controller

14. Lara Howlett – University of Sheffield Frascati, June 2005 Control Logic Position Decoder/Switching Sequencer Optical Isolators Hex-Bridge Electronic 3 Phase Motor Switch (6 MOSFETS) Hall Switches (Position Sensors) ACTUATOR

15. Lara Howlett – University of Sheffield Frascati, June 2005 Current Controller Hex-Bridge Electronic 3 Phase Motor Switch (6 MOSFETS) Position Decoder/Switching Sequencer Active Current Control PWM @ 19.5 kHz Current Transducer User Set Current (8- Bit Resolution)

16. Lara Howlett – University of Sheffield Frascati, June 2005 Future Plans To test this prototype circuitry with the actuator in order to ascertain its performance Development of a quadrature position sensing system (to replace the hall switches) – This will allow greater control of the switching due to improved position information. To develop an interface that will allow the electronics to be controlled via a PC

17. Lara Howlett – University of Sheffield Frascati, June 2005 Radiation Studies Simulations of radiation levels have continued Simulations of radiation levels have continued These now include the geometry of the target mechanism These now include the geometry of the target mechanism Radiation levels in the magnet are extremely high Radiation levels in the magnet are extremely high

18. Lara Howlett – University of Sheffield Frascati, June 2005 Radiation studies Units : Grays/year/ Unit Density

19. Lara Howlett – University of Sheffield Frascati, June 2005 Status of Readout Problems with the readout board were experienced which caused jumps in the counts which were read out Problems with the readout board were experienced which caused jumps in the counts which were read out After long correspondance with the company who provided the board, and returning the board for tests twice the problem has been resolved After long correspondance with the company who provided the board, and returning the board for tests twice the problem has been resolved The readout system will therefore be ready to be used with the new prototype when it arrives The readout system will therefore be ready to be used with the new prototype when it arrives Sheffield will have a summer student who will be working on this in the coming months Sheffield will have a summer student who will be working on this in the coming months

20. Lara Howlett – University of Sheffield Frascati, June 2005 Test Beam Plans There are plans to have the prototype ready for a test operation by December There are plans to have the prototype ready for a test operation by December This would involve intersecting a few ISIS beam pulses when the machine starts up in January This would involve intersecting a few ISIS beam pulses when the machine starts up in January Measurements from the scintillators of the Glasgow group will hopefully allow us to gain a better understanding of how far into the beam we need to go and how the beam profile changes with distance Measurements from the scintillators of the Glasgow group will hopefully allow us to gain a better understanding of how far into the beam we need to go and how the beam profile changes with distance

21. Lara Howlett – University of Sheffield Frascati, June 2005 Backup plans In parallel with the work described two ‘backup’ plans are being investigated in the background In parallel with the work described two ‘backup’ plans are being investigated in the background –The use of a lever to move the actuator away from the target –The use of a cam to provide the motion

22. Lara Howlett – University of Sheffield Frascati, June 2005 Lever Despite the hope that a lever would provide a mechanical advantage discussions with an engineer indicate that because of the low mass of the shuttle this is not possible Despite the hope that a lever would provide a mechanical advantage discussions with an engineer indicate that because of the low mass of the shuttle this is not possible However the use of a lever would give the advantage of moving the electronics and magnets away from the radiation if this is necessary However the use of a lever would give the advantage of moving the electronics and magnets away from the radiation if this is necessary The other advantage of this arrangement is that the target mechanism is isolated from the ISIS vacuum eliminating any possible problems of contamination The other advantage of this arrangement is that the target mechanism is isolated from the ISIS vacuum eliminating any possible problems of contamination

23. Lara Howlett – University of Sheffield Frascati, June 2005 Cam The idea of a cam has also been investigated in the background so that in the instance that the em design does not produce the accelerations required a backup plan is in place. This would be used in conjunction with a lever The idea of a cam has also been investigated in the background so that in the instance that the em design does not produce the accelerations required a backup plan is in place. This would be used in conjunction with a lever

24. Lara Howlett – University of Sheffield Frascati, June 2005 Plans Upcoming milestones: Upcoming milestones: –Prototype should be assembled and ready for tests to begin mid July –Prototype should be sufficiently tested to put in the beam by Christmas –Data from beam tests should be used as input for final design

25. Lara Howlett – University of Sheffield Frascati, June 2005 Conclusions Work towards the prototype is progressing and we expect to start tests in the coming weeks Work towards the prototype is progressing and we expect to start tests in the coming weeks Several successful meetings with ISIS engineers have taken place and these have been extremely useful in progressing with the design Several successful meetings with ISIS engineers have taken place and these have been extremely useful in progressing with the design Exactly how far we need to go into the beam has significant implications for the design, so we should pin this number down as much as we can Exactly how far we need to go into the beam has significant implications for the design, so we should pin this number down as much as we can