Next Meeting

Date: June 25, 1996

Time: 3:00 - 4:00

Place: Test Lab Conference Room

Attendees

D. Douglas, J. Denard, C. Bohn, P. Piot S. Benson, G. Neil, K. Jordan, B. Yunn, and G. Krafft

Items of Discussion

• There were two changes in the minutes from last meeting. I inadvertantly, left off two items that were discussed; they were summarized on a note page not ``continuously connected'' with the other meeting notes. Neil summarized the IR camera status and the fact that he is gathering information from various vendors. He also pointed out the fact that image intensifiers and/or cooled CCD arrays are available to deal with the low power levels in the pulsed beam. His summary is encouraging. Next, he discussed the results of the 180 degree bend diagnostic meeting. The main conclusions of this meeting are to add V measurement capability to the H measurement capability to the BPMs planned in this region, and add a flip viewer/IR imaging system at the 90 degree point in the bend. Denard felt the former proposal was OK; Jordan wasn't so sure given the conductor geometry. Biallas and Feldl are working on the redesign to get the flip viewer in.

• During the standard drawing discussion it was noted that Douglas had published magnet specs in technote 96-026, and that the commissioning review was starting to solidify a bit. Everyone was reminded that the purpose of the review is to obtain ideas on the best (trans. fastest) ways to get to lasing.

New Issues

Happek Device: in the ITS meeting the status of the Happek measurement of bunch length was discussed. The contract is set to start on July 1 and we can expect the first system done 90 days thereafter. The contract aparently includes 5 quarters of graduate student labor, which should help us get up to speed; Jordan will check the conditions are OK. The integration issues, both mechanical, and with EPICS, must be worked out, but we will be obtaining complete, remotely controllable instruments. Also, it goes without saying that it will be beneficial to obtain as much help as possible from him.

Synchrotron Light Monitor plans: again no meeting occurred. A meeting with Denard, Piot, Jordan, Benson, Krafft, and Bohn should be scheduled.

Action Items

A-03 No documentation confirmation as of 4/9/96.

A-19 A preliminary version of the documentation tree (hierarchy) is finally posted! The upper level laser requirements are also posted! Take a look and make comments.

A-26 Neil reported that he was obtaining reems of information on IR cameras, starting with LASER FOCUS magazine. An example is an 8 mum camera developed for security purposes. There should be a meeting this week, and hopefully a detailed proposal next week. A question about S/N came up. It was felt that Phillipe could perhaps provide a calculation of the total power ratio of SR power to blackbody power in a range from 400 nm to 10 mum, in order to find an optimal operating frequency. No due date for this calulation was agreed upon.

A-27 Bohn presented more findings on Autosteering. He summarized the discussion he had with Hutton, the only contentious issue that the plan provoked was a comment that one cannot ``cleanly'' correct the orbit with only six BPMs on the back leg, a statement that Douglas has consistently made throughout this ordeal. As for the availability, it was promised that we could assume we will have Autosteer and it will be free, beyond providing the obvious necessary inputs like BPM locations, optics, and requirements. The only issue needed to be resolve was the technical disagreement as to numbers of BPMs, which should be solvable with a calculation. Some combination of Douglas, Hutton, and Bohn will close this final issue.

A-32 As a result of previous meetings and lack of progress on 10 MeV emittance measurment plans, a meeting was held to discuss the UCLA slit arrangement. Bohn summarized the results of this meeting as follows. The meeting produced a scope of work and an estimate of the manpower needed to get the job done. Some engineering will be required to provide a cooling path for our relatively high average current beam, but the beam bunch parameters of our beam are very close to UCLA's. We also have to worry a little about suppressing secondaries. Currently, Bohn is to arranging for a point of contact who will be able to see this work through during the next few months.

Action Items (assigned)

A-01	Update Drawing                                Bohn                weekly
A-02    Magnet Specifications Webbed                  Douglas
A-03    Stray fields in test stand                    Legg              complete
A-04    Unit gradient precision                       Bohn, Liu
A-05    Injector energy precision                     Douglas
A-06    10 MeV dump optics                            Douglas
A-07    Bypass optics                                 Douglas
A-08    M56/RF phasing and beam load issues           Yunn, Neil, Douglas, Liu
A-09    Dump Instrumentation                          Legg               6/04/96
A-10    Back leg diagnostic placement                 Douglas
A-11   	Multifrequency CSR Measurements               Krafft             6/04/96
A-12    How should the path length be checked?        Krafft, Jordan     6/11/96
A-13    Impedance Layout for Wiggler                  Yunn, Neil        complete
A-14    Reduce M56 to under 30 cm                     Douglas           complete
A-15    Commissioning Procedure                       Legg, Krafft       5/16/96
A-16    Average Current Measurement/Assess Far. Cup   Legg
A-17    4-Channel BPM on the IRFEL                    Bohn, Denard
A-18    Trombones                                     Douglas, Krafft
A-19    Web Documentation                             Krafft              weekly
A-20    10->42 MeV dump                               Biallas
A-21    Diagnostics reviews                           Jordan             6/11/96 
A-22    Beam dump and scaper design                   Wiseman            6/18/96
A-23    Ganged powering schemes                       Douglas
A-24    Beam loss                                     Bohn
A-25    Synchrotron Light Monitors                    Krafft
A-26    IR Camera Plan                                Neil
A-27    Autosteer Plan                                Bohn
A-28    Cavity Coupling                               Yunn
A-29    Software Planning for Longer Term             Bohn
A-30    Burnthrough/Conflat Expansion                 Denard, Kloppel
A-31    S/N for SR to blackbody                       Piot
A-32    10 MeV emittance Plan                         Bohn

P-01    Determine Beam Pulse structure for setup
P-02    Laser phase modulator
P-03    Slit emittance measurement
P-04    Is an energy compression scheme needed?
P-05    Devise fine-tuning procedure for buncher gradient
P-07    Diagnostics "Freeze"
P-08    How do we change energy? What is the energy range?
P-09    Do we need bunching after the module
P-10    Will the SLM monitor work to center the large beam
P-11    Calculate from Hall C data how much scatter the BPMs can take
P-12    FEL/OTR interaction question
P-13    Do we have sufficient diagnostics for emittance degradation measurements
P-14    How is the gun/laser operated?
P-15    Discussion on robustness of controls??????
P-16    Injector diagnostics in the main machine
P-18    Technote by Yunn summarizing machine impedance
P-19    Consistent linac/bunching phase sets
P-20    Lock plans (who in particular)
P-21    Save/restore plans
P-22    FSD plans
P-23    Transverse Effects in CSR
P-24    FEL Commissioning review
P-25    RF control sensitivities/Microphonics Diff for FEL/Pathlength effect
P-26    What if studies
P-27    Plan to measure beam loss
P-28    Scrapers: Where and How?
P-29    FEL/linac interaction
P-30    Tracking including realistic wiggler fields
P-31    What drives the vacuum spec.
P-32    Are two sextupole families enough to tune M56
P-33    Is path length feedback needed?
P-35    Coordinated ITS beam running/SRF commissioning plan
P-36    Beam power robust BPMs
P-37    42 MeV dump design and interlocking

                Item                              Person Responsible     Time
                ----                              ------------------     ----
 *   Review agenda/corrections to minutes	       Krafft	         5 min.
 *   New drawing                                       Bohn           	 5 min.
 *   Web documentation                                 Krafft         	 10 min.
 *   New issues


 *   Autosteering                                      Bohn           	 5 min.
 *   IR Camera Plan                                    Neil          	 15 min.
 *   Transverse CSR                                    Li                15 min.
 *   Active item discussion                            All           	 10 min.
 *   Agenda for next meeting		               All		 5 min.