The use of the E-beam system is sometimes quite heavy, it can be difficult to get a time-slot less than a week in advance, sometimes a booking has to be two weeks in the future.

The general guide-lines are preliminary for the Voyager since it has a much higher writing speed than the 150 tool:

1. Four 2-hour ebeam-sessions per weekday,
   • 09:00-11:00
   • 11:00-13:00
   • 13:00-15:00
   • 15:00-17:00
   These times are maximum limits, if you need less time, please book only that time.
2. On weekdays, after 17:00, bookings are more flexible, longer exposures can be made etc.

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   During periods of heavy use it would be very convenient if users doing overnight bookings could start as late as possible. E.g. starting at 21:00 would give two extra 2-hour ebeam session on a weekday-evening.

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3. During weekends (Fri 17:00 - Mon 09:00) booking is more flexible.
4. Never book more than three sessions in advance! With a session is meant either a 2-hour daytime session, or an overnight session. This also applies to weekends. This implies that if you book Saturday 13:00-15:00, 15:00-17:00, 17:00-overnight, you have used up all three allowed advance bookings!
5. Always report a booking that cannot be used AS SOON AS POSSIBLE! Use this mail adress to reach all users of the system:
   ebeam-users@www.nanophys.kth.se