BAF Instrumentation Update November 99
Topic: Layout BAF beamline instrumentation.
Date: November 5, 1999
From: D. Gassner
A total of eight instrumentation locations are specified for the BAF (Booster Applications Facility). It was determined that we will install at these locations a total of 7 flags, 5 SWIC’s, 3 IC’s and 3 Scintillator/PMT’s. A cost analysis was done to determine the difference of the details proposed here verses the CDR. There were cost increases 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 6" pipe section from the Booster, through the D1 & D2 (18D36) dipoles. There will be a 8" beam pipe from just upstream of Q1 to to the end of the beam line. 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 plunging scintillator/PMT assembly was proposed to be installed at two of the instrumentation locations for calibration of the 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 will be installed just outside the downstream vacuum window, along with an additional flag/video assembly near the target area.
Table of BAF Instrumentation Details
| Location (just upstream of) | Flag | SWIC Wire Spacing (32/plane) |
Beam Size (90% full width) | Ion Cham. | Scint. /PMT |
Est. Vacuum (10n Torr) |
||
Horizontal |
Vertical |
Horizontal |
Vertical |
|||||
| 1) D6 Septum | Yes | N/A |
N/A |
25 mm |
25 mm |
No |
No |
-11 |
| 2) Q1 | Yes | 6.5 mm |
6.5 mm |
60 mm |
120 mm |
No |
Yes |
-10 |
| 3) D1 | Yes | 1.5 mm |
5 mm |
17 mm |
75 mm |
Yes |
No |
-9 |
| 4) O1 | Yes | 6.5 mm |
1.5 mm |
90 mm |
8 mm |
Yes |
No |
-9 |
| 5) O2 | Yes | 3 mm |
6.5 mm |
20 mm |
90 mm |
No |
Yes |
-8 |
| 6) Final window | Yes | None |
None |
200 mm |
160 mm |
No |
No |
-8 |
| 7) DS window | No | 6.5 mm |
6.5 mm |
>200 mm |
>160 mm |
Yes |
Yes |
Air |
| 8) Target Area | Yes | N/A |
N/A |
>200 mm |
>160 mm |
No |
No |
Air |
File: C:/BAF Information/BAF Instrumenatation Update Nov_99
Left over items from the original minutes of 6/15/99
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.