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Linac4 Grids and BWS. Technology Choice. Existing electronics is very old, uses old components, demands a lot of maintenance and pcb’s would need to be redesigned anyway. Though the intensity is unknown, a high level of radiation is expected.

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linac4 grids and bws
Linac4 Grids and BWS

Gerrit Jan Focker, BE/BI/PM

technology choice
Technology Choice.
  • Existing electronics is very old, uses old components, demands a lot of maintenance and pcb’s would need to be redesigned anyway.
  • Though the intensity is unknown, a high level of radiation is expected.
  • Therefore we have opted for a system with only the absolutely necessary electronics near the beamline:
    • Only amplifiers,
    • No logic,
    • No power supplies.

Gerrit Jan Focker, BE/BI/PM

grid overview
Grid overview.
  • Between Grid and Amplifier: two cables with twisted pairs with individualscreening. The two cables will be mounted together in Harting 72-pin connectors.
  • Between Amplifiers and Controls a single cable is proposed (CERN ND100) mounted with Harting 108-pin connectors.
  • Power and I/O control are handled by the same cables, no additional cabling is foreseen.
  • Bias +120V directly onto measuring wires.

Gerrit Jan Focker, BE/BI/PM

amplifier boxes
Amplifier-boxes
  • Up to 32 channels per box. (ADC’s are 36-channel)
  • Motherboard with daughter-boards carrying 4 amplifiers each.
    • Amplifiers with BW = ~1MHz for Linac4,
    • Input amplifiers can be floating at up to +120V (bias).
  • The amplifier box will pass the signals for the I/O control.

Gerrit Jan Focker, BE/BI/PM

controls of grids
Controls of grids.
  • VME-crates:
    • 20 ADC’s divided over 2 crates,
    • Sampling at max. 250kHz,
    • Serial RS422 Control cards, CO-standard.
    • Card for Trigger?
  • 3 Interface chassis, each containing :
    • Up to 8 controller cards
      • Limitation of 8 due to the size of the Harting connectors.
    • 24V power.

Gerrit Jan Focker, BE/BI/PM

grid controller cards
Grid controller cards.
  • Automatic offset-zeroing,
  • Software controlled MUX: output to OASIS,
  • +5V power for Amplifier output stages,
  • Floating +5V power at max. +120V for Amplifier input stages (bias),
  • Pneumatic Movement control,
  • Control of relays for amplification setting and test-signals.
  • Control by RS422.

Gerrit Jan Focker, BE/BI/PM

slide7
BWS.
  • No Encoder, only precision switch.
  • Controlled from the second SEM-grid VME crate,
    • 2 ADC’s.
  • One amplifier card per scanner,
    • The amplifier cards are designed so that two amplifiers can be connected to each single input for redundancy.
  • Use the same control card as SEM-grids (Only 4 channels used).

Gerrit Jan Focker, BE/BI/PM

linac4 amplifier
Linac4 Amplifier

Gerrit Jan Focker, BE/BI/PM

amplifier part control card
Amplifier Part Control card.

Gerrit Jan Focker, BE/BI/PM

design details
Design Details.
  • Amplifier’s Maximum Electrical Input: 10mA,
  • Amplifier’s highest sensitivity: 1μA full scale,
    • The calculated input-related noise-level is ~2nA at 1MHz BW.
    • With software amplification highest sensitivity will be (=<)200nA full scale.
  • Overall BW is defined by the cable-length between grid and electronics,
    • At highest sensitivity the BW is 275kHz for 1,5m cable, 210kHz with 2m cable,
    • At 10μA full scale BW will be ten times higher.
  • Low frequency cut-off: 500Hz.
  • Isolated input-stage: Bias of up to +120V on measuring wires.
  • The design foresees to use test-resistances:
    • At the grid in the vacuum-chamber,
    • Outside the vacuum-chamber at the cable-connection,
    • At the amplifier-inputs.
  • The design is made to accept different amplifier cards so it can be used for other machines as well.

Gerrit Jan Focker, BE/BI/PM

status
Status.
  • All Electronics parts have been ordered (for complete series and spares).
  • All parts are expected before end October.
  • PC-board prototypes expected second week of November.
  • Cables in the tunnel are being installed.
  • At the moment the most important is to get a system running at the Linac4 test-stand.
    • For this a pre-series of amplifier cards must be made after the prototype has been verified. February??
    • The cable has to be adapted to the existing grid, which will necessitate mechanical work.
    • Software must be written.

Gerrit Jan Focker, BE/BI/PM

conclusions and remarks
Conclusions and remarks.
  • This system can also be used for other machines by using different Amplifiers. The “Control-card” has been designed to suit these different applications.
  • BWS: At this stage the detailed design of the connecting parts is being finalised.
  • BWS: a temporary setup is being installed at the test-stand, using old amplifiers.

Gerrit Jan Focker, BE/BI/PM

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