MuCool Meeting Minutes 
             for 15/OCT/99


Scribe:  Dave Carey


O.  News

     Introduces Krish Gounder and Tom Jurgens.
Both have been in the beams division.

1.  LBNL Update

     Imagine what's on WEB side -- could send a FAX --
already have -- 
     Muon collider web site will put in link to 200
MHz cavity effort.
     Most important aspect -- 22 Meg Ohm/meter impedence
Peak surface field is accelerating field on axis, gradient
is 15 MV/m, little low -- needs at least two cells.
Power is 3.8 MW/cell.  Need overvoltage -- Need 10-11 MV.
Doesn't include 20 degree phase angle.  Need at least
two cavities.  Average power dissipated/cell is 5 MW.
Heating on Be disc -- experimenting with radii.  19 W
Power dissipation on one
side.  20 cm radius gives 60.
4th power dependence.
     As of 15 minutes ago -- 21 cm radius -- power 
dissipation 73 watts/side.  Must think of additional
cooling.  Gets thin and hot -- "100 watts is a lot of
power", J. Norem.
     Big window.  D. Kaplan asks for an operating temperature
with no cooling.  Answer is "NO", or just doesn't have it
right now.
     Just FAXed calculations for open-cell structures.
Impedence is 13 Meg Ohms/m.  Surface field/on-axis field
= 2.4.  Is 2.6 times Kilpatrick limit.  On-axis voltage
per cell is 13.5 MV,  15.5 Megawatts/cell.  Tough to 
generate and put in one cavity.  Al gets 1.8 peak surface 
field.  John considers single cell.  Pvv 8 MHz considers 
five cells.
     Al says engineering solution may still have cost --
may go up factor of 10 -- charge by ounce.

     Report on status of simulation.  Target to debuncher
and cooling.  Only 1% acceptance when matching.  Energy
off by 1 MeV.  Some people worried about cooling, others
up to debuncher.  Discrepancies between ICOOL and DPGEANT.
No effect up to 200 microns of window thickness.  20%
loss at 500 microns.
     DK not sure if realistic thickness, claims 65 
microns minimum thickness for AL.
     Simulation AT LBNL over 130 meters with 3 windows/
meter.  DPGeant can do 3-D.  ICOOL requires work.
DPGeant can read MARS or SUPERFISH.

3.  Ed Black

     Note 46 -- page 15.  Parameters for first layout.
Layout showing two sections, length is 5 meters.  Thinnest
portion of window is 50 microns.  Length absorber 36,
radius 20.5 cm.  No coil on the absorber, leaves spacefor tubes.  
No idea how
RFfits in cavity.  Rectangular
duct that comes in bottom.  Next configuration suggested 
by
            -- DETAILS --

     Configuration designed by Al -- RF has 3 cells.
Tubes cross vertically and horizontally.  Thomas has been
working with MAFIA.  Shows 3-D picture with tubes going
through iris.  Try to maintain symmetry between cavities.
     Cost estimate of one liquid H2 chamber test unit.
Contemplate 2 bucking coils to get B into absorber.  
Gathering prices.  John Miller couldn't join us.  Two 
prices -- with and without coils.  Mike Green's coils 
come with cryostat.  Need revised estimate.

4.  Dan Kaplan

     Dan said everything already

5.  Jim (Norem).

     X-Ray spectrum coming out of cavity to see if
TPCs will work near cavity.  Setup at Argonne.

     MAC15.HEP.ANL.GOV

Try to see range of radiation levels -- intepret
preliminary spectrum.  Spectra using various 
materials -- Be, Air, Al, Cu, and Ta.  Physics
defined by photon attenuation length.  Ionization
detectors are carbon.  Total dose during tuneup.
33 rads at beginning of system.  Enormous range
of radiation seen.  Almost no detectable radiation
around 1 MeV.  An lower energies, rate rises 
rather quickly.  Preliminary data X-rays coming 
at lowest detectable energy.  Maximally 
Pathological.