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Fast BLM Functional Specs. 2 different inputs. Func Spec ( EDMS 1233009-Injectors )… Table of Content. 1) Introduction 4 2) Machine Parameters 4 3) Derived Parameter: Integrated Loss over the cycle 5 4) Derived Parameter: Integrated Loss during beam presence 6

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Fast BLMFunctional Specs

2 different inputs

Func Spec (EDMS 1233009-Injectors)… Table of Content

1) Introduction 4

2) Machine Parameters 4

3) Derived Parameter: Integrated Loss over the cycle 5

4) Derived Parameter: Integrated Loss during beam presence 6

5) Derived Parameter: Ambient Radiation 7

6) Derived Parameter: Maximum Loss Integral Values 8

7) Derived Parameter: Loss Evolution Buffer 9

8) Derived Parameter: Capture Buffer 11

9) Derived Parameter: Integrated Losses in the transfer-lines 12

10) Derived Parameter: Loss evolution in the transfer-lines (spill) 12

11) Derived Parameter: Post Interlock Buffer 13

12) Resolution of Measurements 14

13) Interlocking Functionality 15

14) Fast (<2 µs) Loss Observation 16

15) Related Instrument and Monitors 16

… Fast (<2 µs) Loss Observation

Expected Results

In dedicated locations, e.g. the PSB injection dump and PS and SPS injection and extraction regions, BLM detectors able to measure losses with a time-resolution better than 2 µs should be installed for observation purposes. Such measurements are expected to be extremely beneficial during commissioning, operational optimisations and other situations where more detailed structure of the beam loss evolution is required.


  • Measurements from these detectors will be acquired via OASIS-type systems

  • No beam-loss interlocking should be made for these measurements on the front-ends

… Monitors in Func. Spec

Bernd TB’s Technical Specification of Fast DAQ…

Fast BLM acquisition system, B.Dehning

Bernd’s Specification

  • Sampling frequency, bandwidth

    • 500 MHz analogue bandwidth relates to a rise time of 0.7 ns (10 – 90%)

    • Rise time observation 2.3 ns, limited by 1GHz sampling frequency and cable, rise time contribution from analogue part of acquisition almost negligible

Fast BLM acquisition system, B.Dehning

??? Objectives/Priorities ???

  • I> Beam Instrumentation

    • Things we must do and are expected to

    • Request from OP

    • We should not miss that

    • Our Specs up to 500 kHz (2 us)

  • II> Beam Observation

    • Request from ABP

    • We should be proactive there and helpful

    • Fast BLMs up to 500 MHz via (or ‘a la’) OASIS.

  • III> Instrumentation R&D

    • This is for us (to be ready for Beam Observation)

    • One channel somewhere with more for us to test

BCT Injectors Func Spec…

Derived Parameter: Bunch by Bunch Intensity in the Rings

Remark: Bunch intensity is defined here as the charges contained in an RF bucket.

Expected interface:

Should publish a 2D array of bunch by bunch intensity measurements starting from a trigger T with a temporal resolution of R covering Na consecutive acquisition. It should also be possible to select bunches (Nis the number of selected bunches).

NB.: we assume no change of harmonic during the acquisition period, i.e. from T to T + N*R

Expected Performance:

Remark: It is accepted that bunch-by-bunch measurements make little sense during bunch splitting schemes however it is assumed that the measurement will work for all harmonic number values which for the PS machine can go to H84 (72 bunches spaced by 25nsec).