Topic: Layout BAF beamline
instrumentation.
Date: June 15, 1999 1330 911C CR
Present: P. Pile, K. A. Brown, J. Geller, N. Tsoupas, J. Mills, A. Javidfar, A. McNerney, J. Cullen,
L. Snydstrup, minutes by D. Gassner.
A total of six instrumentation locations were discussed for the BAF (Booster Applications Facility). It was determined that we will install at these locations a total of 6 flags, 5 SWIC?s, 3 IC?s and 3 Scintillator/PMT?s. The CDR specified 8 locations for 4 flags, 3 SWIC?s, and 2 IC?s. A cost analysis will be done to determine the difference of the details proposed here verses the CDR. There will be cost increase due to larger quantities, and savings since the SWIC?s, IC?s, and flags will be in the same enclosure, and only the stripping foil/flag assembly will have to be baked. All the plunging assemblies will be located downstream of the baked region which was defined as from the booster ring to the wall just upstream of Q1. The BAF "standard" SWIC/IC/Flag mechanical enclosure will be developed from the existing plunging SWIC design.
The instrumentation electronics and actuator controls will be located in building 930A near the 20o bend. Pneumatically actuated plungers, similar to those in the AGS to RHIC transfer line will be used.
There will be a 8" beam pipe from just upstream of Q1 to to the end of the beam line, except for a 6" pipe section through the D1 & D2 (18D36) dipoles. All SWIC?s will be 32 wires in each plane, the wire spacing will vary, see table below. The beam sizes shown below are from a simulation (P. Pile) assuming a 8 mil copper foil.
A scintillator/PMT was proposed to replace two of the ion chambers as a means to calibrate the other ion chambers. They are located upstream of Q1 and octupole 2 (O2).
A proposal was made to install a video camera to view the full aperture (8") phosphor screen mounted just in front of the downstream vacuum window. The light from the screen will be viewed through a port with a remote control shutter to eliminate light into the chamber when not in use. A PMT may be mounted on another port to detect light from the same phosphor, this signal could be used to characterize the time structure of the beam and feed it back to the spill servo. Beam position information, also for the spill servo, can be obtained from the experimenters dosimetry system.
A plunging SWIC/IC and
scintillator/PMT assembly may be installed just outside the downstream vacuum window.
Table of BAF
Instrumentation Details
| Location (just upstream of) | Flag | SWIC Wire Spacing (32/plane) |
Beam Size (90% full width) | Ion Chamber | Scintillator/PMT | ||
Horizontal |
Vertical |
Horizontal |
Vertical |
||||
| D6 Septum | Yes | N/A |
N/A |
25 mm |
25 mm |
No |
No |
| Q1 | Yes | 6.5 mm |
6.5 mm |
60 mm |
120 mm |
No |
Yes |
| D1 | Yes | 1.5 mm |
5 mm |
17 mm |
75 mm |
Yes |
No |
| O1 | Yes | 6.5 mm |
1.5 mm |
90 mm |
8 mm |
Yes |
No |
| O2 | Yes | 3 mm |
6.5 mm |
20 mm |
90 mm |
No |
Yes |
| Final window | Yes | None |
None |
200 mm |
160 mm |
No |
No |
| DS of window | No | 6.5 mm |
6.5 mm |
>200 mm |
>160 mm |
Yes |
Yes |
Action Items:
- Scintillator material for a vacuum environment investigation.
- Ion chamber lower sensitivity limit.
- Update the BAF Instrumentation Map.
- Cost analysis.
- Impact on the controls support hardware and software.