Request for additional information, suggestions & comments:

(<>) Request - "logic diagram" of the various hardware interlocks and procedures that will be used to control access to the various platforms as well as operation of the septum and polarized target.

(<>) Request - Target chamber exit window beam heating calculations.

(<>) Request - Beam chicane drawings

(<>) Request - Procedure to operate the beam chicane. How are the two instrumentation arms adjusted and aligned? Is the target magnetic field kept on
while adjusting the chicane? Is/has/should the beam chicane be vented to be able to adjust it?

(<>) Request - Radiation damage doses for epoxy (septum coils due to bremsstrahlung)

(<>) Request - Schematic of the target/dump/collimator are and how is(are) the helium bag(s) deployed.

(<>) Request - which windows have/do not have plastic shields, which of those shields are permanent and which ones are removed for data taking.

(<>) Request - as presented, it will appear that the time to access to ramp the beam down (Chris Keith presentation) is of order one hour. From George Kharashvili presentation, it will seem that for the activation studies RadCon will like to access the plug insert within a one-half hour of ceasing beam operations.  At first sight it will seem the two requirements are incompatible. A more detailed procedure of what is being proposed is requested.

(<>) Request - make available the bellows flange load/stress calculations. How is the vertical motion of the chicane magnets interlocked and limited? Does vacuum loading interferes with the motion of the FZ2 magnet?

(<>) Request - training of personnel (designated radiation control staff and associated assigned radiation monitors) regarding the local experiment specific hazards (magnetic field, vacuum, high voltage, plus radiation) at the target, septum and target platform.



(/\) Suggestion - it may prudent to take measures in case that running the beam into the local dump indeed turns out to generate a large neutron dose in the hall and cause damage to the electronics. Some suggestions.
a. - ensure that there are enough spares (e.g. power supplies for the microwave tubes, magnet?, ..).
b. - consider taking protective measures if possible (e.g. distance).
c. - can a "roof" be installed over the electronic racks next to the beam line?
d. - sometimes damage is total (burn out power transistors) but many times it will be soft failures that could complicate things substantially (e.g. false readings which lead to the wrong actions or procedures) - it may be advisable to walk through the operation of the various systems and do a "dry run" of how conflicting information could be recognized.
e. - could PREX simulation/data be used to estimate both soft and hard radiation damage?
f. - consider running most/all the kinematic points that use the Hall A dump before taking data at those kinematics that use the local beam dump


(/\) Suggestion - ESAD & local signs should clearly point out the risk of damage to credit cards and similar (e.g. magnetic strip), and the risk that small objects
(metal pins, glasses, pens and so on) be pulled in if the person gets too close to the energized target  (e.g. work in the beam line bench with BPMs, wire scanner, ..)

(/\) Suggestion - Consider protecting the bellows from particulate material lodging in the bellows. These can and have cause bellows ruptures when bellows are compressed.


(?) Comment - COO, ESAD and other documents seem to be in draft form with statements that seem to refer to other halls (Hall C?)

(?) Comment - COO/ESAD should refer to all work documents (OSPs/TOSPs) associated with these experiments

(?) Comment - Beam chicane: are there any spare bellows?