**Agenda for 4/24/03 femtosecond Thursday meeting at 12:30 pm in
6-1105**

**-Phil \-\-\-\-- The scientific reasons for a scope change for the hard
Xray monochromator ,**

**the monchromator crystals and multilayer requirements.**

**-Rob\-\-\-\-\-\-- Crystal and multilayer layout.**

**update on the beamline layouts \-- 2 possible options with a
chicane.**

**-Phil\-\-\-\-\--trip report from the workshop: \"Ultrafast Science
with X-rays and Electrons\"**

**in Montreux, Switzerland.**

## Minutes

Alan requested the leads to update the individual sub project schedules
as needed to be consistent with the summary schedule presented by Bob
two weeks ago. This schedule had only minor changes from the schedule
presented at the Kem Robinson review. The scope change for the hard Xray
monochromator , and the option for dedicated function beamlines,
requires that the cost, and schedule for the beamline will now need to
be re evaluated for resulting impact. The IVID needs to be developed in
more detail and the scope for the chicane needs to be added. Jim
Dahlgard is preparing the full WBS and project ID list, he will also be
distributing the funding available between the project ID's that will be
active this fiscal year. Expenditures will be tracked on a monthly
basis. It was confirmed that the baseline scope for the femtosecond
effort is as presented at the review with the subsequent ALS management
decision to adopt an IVID. The review presentation book should be
reviewed and updated.

Phil then showed a chart indicating the various factors that had reduced
the expected photon flux for the hard Xray experiments to about 1/20 of
that indicated in the original proposal..

\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--A factor of 2 is from the
source\-\-- the wiggler has a large fan angle of which only a fraction
is reflected by an 800mm. long mirror , and the now chicaned ID is at a
greater distance having been moved upstream (20% effect) Christoph
reminded us that this location was still subject to physics
confirmation.

\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--A factor of 4 is lost as
the slicing efficiency is lower, this is due to the longer ALS electron
bunch following the third harmonic cavity installation.

\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\--A factor of 2 is lost
going from a Germanium to a Silicon crystal in the mono.

The scope change being presently evaluated is to change the
monochromator design. The goal is to come up with a design using
germanium crystals with enhanced cooling and also incorporating
multilayers. Germanium crystals had earlier been discounted as slope
errors of over 100 microradians were calculated, the requirement is for
4 microradians. With this scope change the planned 10.3.2 mono. design
is no longer suitable. The KOHZU mono may be an alternative, with
modifications. Rob showed some quick layouts prepared by Daniela to see
if a suitable geometry could be identified. Daniela thinks that for a
10mm. offset a solution may be possible with a modified KOHZU design.
More work is needed to verify this. It was suggested that an on axis
scheme should be investigated. Bob commented that he thought we did need
to adopt this scope change and that the option for a germanium crystal
would be needed in the future.

Rob then showed preliminary beamline layouts for the chicaned beamlines.
The space constraints are severe for either two separate mirror tanks,
or two mirrors in a single vessel inside the shielding. Concerns were
expressed about the time that might be required to develop realistic
workable design options and the potential costs of fabrication. The
possibility of increasing the chicane bend angle was brought up and it
was remarked that the shielding had been modified for the chicaned
straight in sector 4 of the ALS.

Phil gave a brief report of his trip to the ultrafast science workshop.
He reported that BESSY are anticipating a January 04 installation of
their modulator(U139) and expect operations early that year. SLS expect
picoseconds in 04, and femtoseconds in 05. It was pointed out that they
use radiation monitors to check the minimum ID gap, Christoph said we
would move beam loss monitors to straight 6. He also said he believed
that 3mr was the present chicane limit and that 4.5mr was the corrector
limit.

**Action Items (Updated)**

Leads---review schedules and update if needed.

All\-\-\-\-\--update review presentation book.

Steve R.\-\-\--Post risk data on the web site

Steve M\-\-\-- develop IVID procurement strategies with vendor

Phil/Rob\-\-\-- prepare initial assessment of scope change request to
develop new beamline optical design, cost and schedule.

Leads\-\--set up Project ID's asap.

.

Ross\-\--find out what is known at Maxlab about the in-situ RF heating
and radiation on the cold bore for an installed SCID. Also, since ANKA
and Singapore are placing orders with ACCEL for SCIDs, it would be
useful to know how they have specified the cooling requirements

Check options for W16 cost recovery with Gavin Robillard\-\-\--Alan

(Steve reports from Robillard that if another national lab expresses
interest in W16, we can only expect them to pay incidental costs of
removal from the ring, packing, shipping etc.)

Get written approval for the installation of W11 from BCSB
management\-\--Howard?