Comments on NuMI Review of Design Specs.
		for Primary Beamline Instrumentation

			July 26, 2001

		from 	Rick Ford
			----------------


Overview: I think Sam and Peter have done a good job of trying to utilize
	existing equipment as much as possible. As has been mentioned by others,
	needs to be significant more thought put into trying to understand
	extraordinary needs of the beamline and experiment. In order for 
	them to deal with these issues appropriately they are going to need
	to interact with the support groups. Unfortunately, it is very
	difficult to find that help right now. If, as one reviewer put it,
	Run II and Miniboone have priority over NuMI, then they will even be
	worse off than Miniboone. Miniboone is currently attempting to utilize
	electronics engineers outside of the Beams Division on two important 
	projects that would normally be done by RF&I engineers. Nobody in RF&I
	or Miniboone is happy about this situation because RF&I will have to
	commission and maintain equipment they did not design. So for NuMI to
	really make any progress on their extraordinary instrumentation needs,
	they are going to need more help.

  
Items:
	1. A non-trivial effort will be required to design a BLM system which
	is foolproof to use for groundwater protection. Not only must the long
	BLM system have a heartbeat, but you must able to show that it is
	working all along the length of the monitor.

	2. The long BLMs or Total Loss Monitors (TLMs) as we use to call them
	should be used for the entire length of the beamline on a separate
	system from the standard BLMs in case some part of the control system
	goes down. One percent of the beam continuously lost would not be
	noticed by a toroid or eberm but could create a no-man's land in the
	beamline. This is also a concern for Miniboone.

	3. All of the concerns about the autotune program will likely be
	resolved well in advance of NuMI operation. Autotune is a non-
	trivial project that will be of great concern to Miniboone.

	4. I hope that someone actually calculated the wire heating and shock
	on the multiwires where the beam is small.

	5. How many pulses does it take to burn a hole in something? Even
	though NuMI claims they don't need an eberm system, they will need
	something similar. Lucky for them, Miniboone's design should be
	almost plug and play for NuMI.

	6. NuMI should investigate whether they need an Rf monitor like a
	resistive wall monitor. It may be used for gating events in the near
	detector and/or as a beam present detector to tell the toroids when to
	be active.

	7. A plot showing beam size, with dispersion versus aperture size would
	be useful for determining locations of instrumentation and other things.

	8. A better understanding of the Rf gymnastics required for bunch
	rotation between NuMI and PBar production. Considering the dispersion
	requirements, this must be monitored and automated.