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Adapting XAL for LCLS

In order to use XAL as a framework for high level applications development for LCLS, there are two main tasks that must be completed.

Setting up the RDB to support XAL applications

Representing the LCLS accelerator components for XAL applications and the on-line model

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Representing Accelerator ComponentsThere is a significant amount of time required to set up the RDB for XAL and a new system. During this time developers may work with XAL applications and on-line model by creating an accelerator configuration file by hand.

We had some initial confusion in configuration/model assumptions(relative vs. absolute positions, how magnets are split, definition of sequence, scenario, etc) which made it difficult to create this configuration file at first.

The component interface classes (SMF) are quite specific to the device (as to be expected). New component types need to be added, and some accelerator components need to be re-defined for LCLS

For example, SNS BPMs measure different parameters than LCLS BPMs, hence the BPM interface class must be sub-classed or newly defined

New machine element classes must be defined for a complete LCLS model (solenoid, RF structures for LCLS). The process for creating these classes seems straightforward; documenting this process would be helpful.

Mid-level documentation, some class and sequence diagrams, would be very helpful to the XAL novice

However, excellent support from the SNS XAL team has helped overcome all difficulties so far - thank you!