27 January 1995
To: Gordon Bowden, Hobey DeStaebler, Jonathan Dorfan, Stan 
Ecklund, Fred Goozen, John Hodgson, Roy Kerth, Tom Mattison, 
Martin Nordby, John Seeman, Mike Sullivan, Dieter Walz, U. 
Wienands, M. Zisman, 
From: Stan Ecklund
Subject: "IR +- 1m Engineering"  Meeting Notes 27 January 1995

Hobey described his calculation of B1 magnet field harmonics 
induced from an azimuthal temperature variation.  The effect is 
small, of order 1/2% per 1% magnetization change corresponding to 
33 deg C peak temperature difference.

John Hodgson presented first results of 2-d (azimuthal slice) heat 
calculations at the synchrotron mask inside of B1.  Introducing a 
slot outside the cooling channel helps keep the magnet at a 
uniform temperature to a few tenths of a degree C instead of 6 
degrees without the slot.  Next he will put in scattered 
synchrotron radiation, about 10%, distributed azimuthally.  HOM 
heating is expected to be small in this area but has not been 
calculated.  The magnetic material runs 7 deg C hotter than the 
water.  Roy would like vertex detector ambient and hence B1 
temperature below 25 deg C, closer to 20 deg C.  Temperature 
monitoring of several places on B1 will be desirable.  The water 
cooling for the mask will need to be temperature regulated to 
satisfy the vertex detector needs.  Probably independent 
regulation of each side is required since the heat input is driven 
from LER for one and HER for the other.

A drawing from John Seeman showing a possible pump and BPM 
geometry located between Q1 and B1 was shown and discussed. 

The magnet block to detector cone interference region was 
discussed.  The magnet is of concern as to whether it can be built 
once all the details of supports and cooling etc.. are included.  
High priority is to proceed with the engineering of this area out 
to and including the B1's.  

The Be to SS transition was discussed.  It is expected an Al 
intermediate material is needed, but someone has heard the 
transition can be made directly.  Gordon will ask Knut Skarpaas 
VIII about this.

Gordon presented a calculation of the deflection of the support 
tube under 1 g of force.  This is relevant for care during 
assembly and installation as well as earth quake damage avoidance.  
The radial clearance between the BE pipe and the vertex Si is 2 
mm.

Action Items:
1.  Start a CAD drawing of the Be pipe - B1 - Q1 region with 
proposed 
    changes such as B1-Q1 proposal from Seeman. [Martin,...]
2.  Calculate Be beam pipe cooling with water and He.  Can inlet 
and 
    outlet both be from upbeam HER side [Dieter, Tom]
3.  Investigate Be-SS transition. [Gordon]
4.  2 cm space near Be-SS joint in forward manifold. [Gordon]
5.  Refine thermal calculations of mask-B1 cooling.  [John H.]
6.  Slope of Synchrotron mask plus Ta collar. [Mike, Roy]
7.  Support tube assembly sequence.  Number and location of holes 
in
    support tube. [Gordon]
8.  B1 mechanical construction and Sm2Co17 trim pieces []

attachments: Transparencies, Bowden Memos 1/25/95, Seeman drawing.

Next Meeting: 13:00 Friday  3 February 1995 in the Yellow room 
with TV to LBL

Agenda:  Status Reports for action items.
         Roy will describe Si Vertex detector mount on B1's.