Timing and synchronisation to ISIS RF Edward Overton 1.

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Presentation transcript:

Timing and synchronisation to ISIS RF Edward Overton 1

Contents Handling of the ISIS RF The MICE trigger configuration for the Single Station test. Delay measurements Trigger rate Timing to MICE 2

Handling the RF The goal of processing the ISIS RF is to produce windows that can be moved around to meet the particles / triggers. The RF is handled by two delay boxes working together configurable over Ethernet. The second delay box triggers when the first is ‘busy’. 3

Handling the RF Timing diagram for single channel of the delay box. Can Adjust Delays and Width independently. Maximum Frequency = 2/( Delay + Width + Dead time(60ns) + Safety(10ns) ) Delay + Width = 575ns 4

Configuration of the delay boxes Used a simple CLI python script to configure the delay boxes for the Single Station Test. The script saved a record of every setting downloaded to the delay boxes with a hard coded filename (so it will be possible to read/reload them later). 5 [miceacq11] delayTest >./setTrackerTiming.py -h _____ _ _____ _ _ |_ _| | | |_ _(_) (_) | |_ __ __ _ ___| | _____ _ __ | | _ _ __ ___ _ _ __ __ _ | | '__/ _` |/ __| |/ / _ \ '__| | | | | '_ ` _ \| | '_ \ / _` | | | | | (_| | (__| < __/ | | | | | | | | | | | | | | (_| | \_/_| \__,_|\___|_|\_\___|_| \_/ |_|_| |_| |_|_|_| |_|\__, | ============================================================ __/ | Configuration and Download Script |___/ usage: setTrackerTiming.py [options] This script calculates and downloads settings to the T560 Delay boxes, in order to configure the alive window and integration windows for the tracker. options: -h, --help show this help message and exit -c CFGFILE, --config=CFGFILE read delay configuration from CFGFILE -v, --verbose Print out everything --logs=LOGDIR destination to place configuration logfiles --skipconfigure skip the configuration step --skipdownload skip the download step

Implementation 6

7 MICE Trigger Logic for the SST

Delay Measurements Have started combining the measurements taken during the single station test. Adding the signal delay though each piece of equipment into an spread sheet  Have found some missing measurements (guestimate for the moment, will check when at RAL). So far a summary: 8 Delay (ns) Integration window (RF->AFE)324 Alive window (RF->Veto)34 TOF Signal (PMT signal->Logic pulse in MICE trigger)306 LED Trigger (Voltage pulse in SS -> Logic pulse in MICE trigger)332 Logic pulse in MICE trigger -> VLSB Trigger619 Integration window delays DescriptionDelay(ns)Total Delay (ns) Patch Cable22 TTL->NIM Conversion?79 Patch Cable211 Logic Fan In/out718 Patch Cable220 NIM->TTL Conversion?727 Patch Cable431 Cable to Hall? Patch Cable2283 V976 Fan out9292 Cable to AFE32324

Trigger Rate 9 We measured the effect of the alive window on the trigger rate, while moving the alive window. There was no digitisation dead time included for this study for the tracker (normally 6us). We recorded the number of triggers on the scalars for 10+ spills. On average there were 150 Triggers / spill. Later I took a specific run where I varied the particle triggers from 120/spill to 9/spill using the target. I excluded the digitisation window so that one could be applied later and we can see how it effects the rate.. Would this be useful?

Timing to other Detectors 10 The tracker calculates time relative to the end of an integration window. The TOFs record the relative time of the particle trigger.. A possible plan to link the two Not sure how far back to go… Hopefully should visit Yordan while he is MOM so we can have a go at this… Integration Window Particle Trigger TOF PMT->TDC Trigger Integration Window TDC Particle Trigger TDC Integration window transmit time to hall.