Difference between revisions of "CLAS12 R1 Progress Reports"
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Revision as of 19:07, 10 October 2011
The Drift Chamber Wiki at JLab
Clean room Prep
Clean room Construction 2011
Jlab Shipment 8/8/2011
Jlab Stringing Prep
Install fixtures
8/9/11
Installed the crane
Brought down the platforms
Bring down the scissor lifts
8/17/11
Install A-Frame for mounting DCs
Mounting Sector 1 DC
Changing Room
8/23/11
Finished installing the changing room. The changing room is used to put on clean room apparel prior to entering the clean room. A HEPA filter is placed on top of the room and set to high in order to blow particles off a person before they enter the clean room.
We still need to install a hard door between the changing room and the clean room.
Clean Room 8/23/11
September
9/22/11
The doors into the clean room have been sealed by temporary walls for the renovation project which will start in the room next door. Below is a picture of the wall which has sheet rock on top of a plastic cover surrounding metal studs. The wall has been calked on the outside to prevent dust from coming through.
Also note that the HVAC temperature setpoint was changed to 68° F around noon.
9/23/11
2 - 480 V outlets have been installed.
Cleanroom fans were turned on this afternoon around 2:30 PM.
9/25/11
The chamber was wiped down and vacuumed.
All of the pre-tensioners have been set to a spring height of 1.75".
9/26/11 - Stringing Begins
Temperature fluctuations were within ± 2° during the stringing
HVAC temperature setting was dropped to 67° from 68° and the Δt was changed from ±2° to ±4° at around 1 PM.
Due to the late start this afternoon, we were only able to string 3 guard wires.
9/27/11
Temperature fluctuations were within ± 1° during the stringing
With 3 stringers rotating, we were able to string 45 Guard wires today.
9/28/11
A strip door was installed between the cleanroom area and the beam lab counting room. Several ducting pipes that are connected to adjacent rooms were also sealed off.
69 Guard wires were strung today.
The graph below was drawn at 6:32 pm on 9/29/11. It seems time stamp 0:00 corresponds to 6pm. It appears that the stringers enter the clean room around 8am (14:00) and warm up the clean room by almost 1 degree. TEMP4 is a thermometer on the vinyl wall right next to the chamber that is currently being strung. Temp1 is the middle of the clean room. Temp2 and Temp3 are on the opposite wall to the drift chamber currently being strung.
9/29/11
Since the previous change of our Δt to ±4° only changed the amplitude of our temperature change and didn't change our frequency, our Δt was changed back to ±2° at 2:30 PM.
91 guard wires were strung today.
The HVAC temperature set point was increased to 68° F at 4:15 PM.
9/30/11
The HVAC temperature set point was increased to 68° F yesterday at 4:15 PM.
The overnight temperatures are shown below (image taken at 8:45 am on 9/30/11)
Guard wires for SL2 were completed at 11:30 AM.
Pictures below show us rotating the chamber in preparation for stinging SL1 guard wires.
We started stringing guard wires for SL1. Total wires strung today: 51.
- Average Temperature for the First week of stringing
October
10/3/11
124 guard wires were strung today.
10/4/11
90 guard wires were strung today.
All guard wires have been strung.
The chamber has been rotated and we will start stringing field wires tomorrow.
10/5/11
48 field wires were strung today. Tension measurements were made for all of these wires also.
Temperature measurements are odd and are a concern. Will continue to monitor this. Possibly the heat created by the magnet and it's proximity to the temperature sensor?
10/6/11
49 field wires were strung today as well as 8 redo's.
10/7/11
63 wires were strung today.
14:00 on the temperature graph is 8:00 AM.
10/10/11
In an effort to increase the speed and accuracy of the tensioner, I (Larry) made this little do-hicky:
The glossy finish might pose a problem, but we will give it a try and see how it works out.
Temperatures this afternoon climbed up to 71.7°. This does not show up on the 5 minute average, so here is the 1 minute average.
Temperature setpoint was changed to &plusmin;1°. Will continue to monitor this.