Date Sept. 28, 2000
Attendees S. Aleksandrov, S. Danilov, M. Doleans, 
J. Galambos, D. Jeon, J. Holmes, S. Kim, S. Martin, 
W. Wan, J. Wei
 


J.Galambos discussed the DTL Preliminary design review. The review was engineering 
oriented. Significant detailed engineering analysis has been performed to date. No show 
stopper questions were raised, but a number of detailed questions were voiced,. such as 
use of rad hard equipment, and quantifying the safety margin of the cooling analysis.

There was a discussion of the PMQ / EMQ issue for the DTL. S. Martin discussed some 
conversations he had with linac builders, who share the view that PMQ are a valid
choice for the 405 MHz DTL. The effect of high multipole content needs to be checked.
Also there is a need to get EMQ experience and a list of emittance blowup in existing linacs.

Sang ho discussed the cavity workshop. The HOM analysis is the main issue,
namely the need for a HOM coupler. This question needs to be answered soon. Sang ho
showed some preliminary analysis indicting large heat loads may be probable without
HOM couplers. The issue of adjustable couplers also arose, namely what is the range of
the fundamental couplers, and is this enough to accomodate variations in cavity
peak surface voltages, transit time factors, reprograming to accomodated 
failed adjacent cavities, and maintaining good matching so as to not impact
unfavorably on the available klystron power (i.e excessive relected power).
M. Doleans and J. Galambos will check on this.  

Dong O Jeon discussed the BBU simulations. He sees beam trransverse blowup with the 
transient beam structure included, if the HOM frequency  spread  is neglected
and Q_L = 1.e7. Inclusion of the frequency spread eliminates the transverse
beam deflection
 
Sasha went over the preliminary diagnostic requirement table. He also discuused the
influence of the inpiut beam twiss alpha parameter on the beam profile in the MEBT.  
The MEBT profile is insensitive, indicating that it may be difficult to measure 
the alpha by downstream profile measurements.

Jeff Holmes presented an initial table of  ring working points. Valid operating points 
meet constraints on beta, quad strength and resonance avoidance. Several possible points 
are identified.

Weishi presented preliminary ground motion and settlement results. There is expected
to be < 3 inches of settlement in the linac tunnel. Differential settlement is less. 
There is a need to verify adequate stand adjustment and waveguide flex. Analytic scaling 
shows that correlated ground motion is not important. The effect of uncorrelated 
ground motion needs to be checked.