From: "Spencer, Cherrill M." <cherrill@xxxxxxxxxxxxxxxxx>
Date: 2005年7月23日 11:48:14:JST
To: <atf2-magnet@xxxxxxxxxxxxxx>
Subject: [atf2-magnet 47] Magnet Chapter in ATF2 proposal revised;
4 specification documents submitted to IHEP
Reply-To: atf2-magnet@xxxxxxxxxxxxxx
Dear colleagues with an interest in ATF2 magnets
I wanted you to know that I have revised the magnet chapter in the
ATF2 proposal and submitted the revised version to Andrei Seryi. I
read Toge-san's comments on our chapter and responded to all of
them EXCEPT his suggestion that the details about the chosen
magnets in sections 9.3,9.4 and 9.5 were too detailed. I think it
is to the proposal's advantage that we have already done so much
work on one of the beamline's major components, that the quadrupole
design has been finalized and that they are relatively simple
magnets to make. So I left all the details in to prove these points.
I revised the section 9.1 to carefully show some different counts
of magnets -- one can come up with various total numbers of quads,
depending on where in the beamline you start counting.
I would like the Alignment group who wrote chapter 7 (I think,
Sugahara-san, you were in charge of that chapter) to read through
my revised section 9.1 (included at the end of this e-mail) and
decide how to modify their count of magnets in their first section
to match up with any one of my counts.
*********
I have written 4 very detailed specification documents that, taken
with the 3 drawings we have of the chosen TOKIN 3390B quads, will
allow any magnet shop to fabricate the new ATF2 quads to meet our
material and fabrication specifications. These specs have been
through some preliminary review by Sugahara-san and some of the
magnet experts at IHEP (who we intend should fabricate these quads).
I have revised the 4 specs according to their comments and
yesterday issued the current versions to Sugahara-san, Kumada-san,
Masuzawa-san and 5 IHEP engineeers. I believe these specs are
sufficient for them to carry on to the next stage in their
contractual process.
If anyone else wants to have their own copy of these WORD
documents-- please ask one of the 3 KEK people listed above,
because I am NOW OFFICIALLY ON VACATION until 15th August!!
Good-bye until then!
Cherrill Spencer
SLAC.
**** Here is the revised section 9.1:
The MAD deck of the optics has been transformed into a series of
magnets, which start at the present end of the ATF extraction line
(the last magnet of which is BH4) and can be divided into 3
sections serving different purposes. The first section starts at
QD5X and extends the present extraction line by 19 quadrupoles,
the next, matching, section has a chicane made from 4 dipoles and 6
quadrupoles (QMnn) and the last section is the Final Focus which
has 16 quads, 3 bends, 5 sextupoles and 2 octupoles. Therefore
there are a total of 41 quadrupoles, 7 dipoles, 5 sextupoles and 2
octupoles in the ATF2 beamline.
Some of the quadrupoles are existing magnets that will be moved
from other positions in the present ATF extraction line. A total of
30 new quadrupoles, 7 dipoles, 5 sextupoles and 2 octupoles need to
be designed and fabricated. In this chapter it will be shown that
28 of the 30 quadrupoles can be made from the same design and a
suitable design has been identified.
**************************************