MUCOOL Minutes: Friday 3rd Sept. 1999

                Scribe: Jocelyn Monroe


1) Fast Timing, Alan

	goal: 10 ps cerenkov timing, tagging muons

	status: -technical design complete, mechanical design in progress, 
		by Jerry Zimmerman.  Need to bug him for 50% of his time.
		He's looking for student for fall/winter.  Grad. or co-op, 
		EE a +, but he will even take a physicist!

		-output electrode issue resolved

		-HYPRES got $600,000, they have equipment that has
		demonstated 33 ps timing, They are aiming for 2 ps, 
		will visit soon.

		-there is a system like this one at LANL, pub. 1988, 
		for heavy ion research, it had ~50 ps timing.

	Questions:-Is the geometry of the material clear?  answer: there
		will be no final design until the expt'l setup is decided upon.

		-stripline?  answer:  haven't looked at it yet.


2) RF @ LBNK, John

	focus: Be Window

	-have measured texture profile of window with infrared camera
	-made other windows (Cu, Al) of same thickness, have played
	around with stresses, though stressing window @ LBL didn't work so well.
	-result of stress tests? measured delta of 25-27 degrees btwn
	center and rim, but the Be foil had no displacement, cf Al, Cu, 
	which had ~1mm.  
		conclusion: requested machining tolerances sufficiently
		pre-stressed the Be window.

	-Low Power Test Cavity:
	status:  access to bucking chamber next week , will begin to make
		cold measurements.  
		-will observe Be window under RF heating, will measure
		temperature, displacement, and change in cavity
		resonant frequency.


3) 200 MHz R&D, Norbert

Main Question: what can we do before we know the layout of a storage
ring/neutrino source?

so far:  RF lab set up for 805 MHz, almost ready.  There is extra space,
we should use it for 200 MHz testing.

to do:
-prepare lab G setup, need modulator for 200 MHz tetrode, and tetrode.
THe
LINAC has a spare 200 MHz source, we could use an old 5 MW modulator.
-studies of power sources, feasability of higher power, lower frequency
power source.
-simulate the effect of the grill window thing on the front of cavity.
will this improve particle transmission?  What do the LBL simulation group
assume in their simulations of these cavities?
-if the emittance is really large anyway, can we use a higher Z material
in the window to eliminate mechanical stress problems?

cavity work:
need simulations to proved that we really do need 15 MW/m, and have people
put in work to reduce this?  concerned about achievable gradients and how
to couple in power.  Reluctant to have such high gradients because
eerything gets more complicated.

bottom line:
	<This is not yet an R&D program. Things need to get simpler before
N. will recommend expenditure of time & money to 2nd fl.



4) Liquid Helium heat Exchange, Kevin

problem:  LHe flow is mostly parallel to beam path ->concentrated heating
of the LHe.  Need to make LHe flow perpendicular to beam direction.

proposed solution:  use convection, which will naturally flow transverse
to beam dir.  and cool with some cold material (H, He?) circulating in 
pipes surrounding the LHe, i.e. bring the coolant to the LHe, as opposed
to muhammed to the mountain.

status:  a preliminay design exists, which includes a heater at the bottom
of the pipe to get the convection going in entire LHe volume.  Heater will
also maintain temperature ->density gradient when the beam is off. N.: why
not regulate the flow instead?

to do: simulate, including the heater.  are there computing resources
avalable at fermilab?
-estimate heat needed in heater.