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BLM for the Injectors project LINAC4 & PSB - additions

Beam Instrumentation Review – 19/10/2011. BLM for the Injectors project LINAC4 & PSB - additions. ACFC principle. A status signal selects in which branch of a fully deferential stage the input current is integrated.

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BLM for the Injectors project LINAC4 & PSB - additions

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  1. Beam Instrumentation Review – 19/10/2011 BLM for the Injectors project LINAC4 & PSB - additions Christos Zamantzas (christos.zamantzas@cern.ch)

  2. ACFC principle • A status signal selects in which branch of a fully deferential stage the input current is integrated. • Two comparators check the deferential output voltage against a threshold, whenever is exceeded, the status signal changes to the complementary value (0 ! 1 or 1 ! 0) and the input current is integrated in the other branch. BI LINAC4 Review – 18/10/2011

  3. ACFC data processing counts thhigh ADC values thLow 0 Time 2 μs 2 μs 2 μs • The number of counts accumulated are combined with the ΔADC values to provide the integrated loss over 2 μs. • Most of the operation is handled by the FPGA . That is, counting of pulses , clock the ADC and make difference of the ADC values. BI LINAC4 Review – 18/10/2011

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