Difference between revisions of "CLAS12 R1 Progress Reports"

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[[file:10112011_CleanroomTemperature_4.png | 400 px]]
 
[[file:10112011_CleanroomTemperature_4.png | 400 px]]
  
Stringing resumed once temperatures were within acceptable levels.
+
Stringing resumed once temperatures were within acceptable levels (~11 AM).
  
 
Average temperatures remained right at 70° with ±1° fluctuations the remainder of the day, even with both of us stringing and measuring tensions.
 
Average temperatures remained right at 70° with ±1° fluctuations the remainder of the day, even with both of us stringing and measuring tensions.

Revision as of 22:24, 11 October 2011

The Drift Chamber Wiki at JLab

Clean room Prep

CleanRoomPrep2009-2011

Clean room Construction 2011

CleanRoomConstruction2011

Jlab Shipment 8/8/2011

JLabShipment08082011

Jlab Stringing Prep

Install fixtures

8/9/11

Installed the crane

1CLAS12DC Crane 08092011.jpg2CLAS12DC Crane 08092011.jpg


Brought down the platforms

1CLAS12DC Platform 08092011.jpg2CLAS12DC Platform 08092011.jpg


Bring down the scissor lifts

2CLAS12DC scissorLift 08092011.jpg

8/17/11

Install A-Frame for mounting DCs

1CLAS12DC Aframe1 08092011.jpg2CLAS12DC Aframe1 08092011.jpg

Mounting Sector 1 DC

1CLAS12DC MountDCS1 08092011.jpg2CLAS12DC MountDCS1 08092011.jpg3CLAS12DC MountDCS1 08092011.jpg4CLAS12DC MountDCS1 08092011.jpg

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.

2CLAS12DC ChanginRoom 08232011.jpg

We still need to install a hard door between the changing room and the clean room.

Clean Room 8/23/11

1CLAS12DC CleanRoom 08232011.jpg2CLAS12DC CleanRoom 08232011.jpg

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.


09222011 CLAS12DC CleanRoom.jpg

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

092511 1CLAS12R1StringingBegins.jpg

Temperature fluctuations were within ± 2° during the stringing

092511 1CLAS12R1StringingTemp.png

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

092711 1CLAS12R1StringingBegins.jpg092711 2CLAS12R1StringingBegins.jpg092711 3CLAS12R1StringingBegins.jpg

Temperature fluctuations were within ± 1° during the stringing

09272011 1CLAS12R1StringingTemp.png

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.

09282011 1CLAS12R1StringingTemp.png

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.

092911 1CLAS12R1StringingBegins.jpg092911 2CLAS12R1StringingBegins.jpg

91 guard wires were strung today.

The HVAC temperature set point was increased to 68° F at 4:15 PM.

09292011 1CLAS12R1StringingTemp.png

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)

09302011 1CLAS12R1StringingTemp.png

Guard wires for SL2 were completed at 11:30 AM.

Pictures below show us rotating the chamber in preparation for stinging SL1 guard wires.

093011 1CLAS12R1StringingBegins.jpg093011 2CLAS12R1StringingBegins.jpg093011 3CLAS12R1StringingBegins.jpg093011 4CLAS12R1StringingBegins.jpg

We started stringing guard wires for SL1. Total wires strung today: 51.


09302011 2CLAS12R1StringingTemp.png

Average Temperature for the First week of stringing

Week1CLAS12R1StringingTemp.png

October

10/3/11

124 guard wires were strung today.

10032011 CleanroomTemperature.png

10/4/11

100411 DFStringing1.jpg 100411 DFStringing2.jpg

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.

10042011 CleanroomTemperatures.png

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?

10052011 CleanroomTemperatures.png

10/6/11

49 field wires were strung today as well as 8 redo's.

10062011 CleanroomTemperatures.png

10/7/11

10072011 Marcie Stringing.jpg 10072011 Mallory Stringing.jpg

63 wires were strung today.

10072011 CleanroomTemperatures.png

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 lines on the acrylic allow a stringer to more easily position the wire perpendicular to the endplate when adjusting the pulley used for hanging weights.

10102011 Do Hicky1.jpg 10102011 Do Hicky2.jpg

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.

10102011 CleanroomTemperature 1.png

Temperature sensitivity (%Delta;t) was changed to ±1° at around 12:45 PM. Will continue to monitor this.

Changing the sensitivity caused our average to drop about 0.5° but the amplitude of our fluctuations decreased. The minimum is lower than I would like, so the sensitivity is being changed back to ±2° at 3:20 PM.

10102011 CleanroomTemperature 2.png

The HVAC filters showed up this afternoon, so this is being replaced. I will continue to monitor temperatures tomorrow. If temperatures climb back up to 72° again, I will change our sensitivity back down to ±1° as well as change our temperature setpoint to 69° (up 1°) in an attempt to keep our average closer to 70°.

63 field wires were strung today.

10/11/11

It appears that changing our HVAC filter dropped our average temperature to 69° with fluctuations of ±1°.

10112011 CleanroomTemperature 1.png 10112011 CleanroomTemperature 2.png

The temperature setpoint is being increased to 69° in an attempt to get our average to 70°. This was done around 9 AM.

This change did not work as hoped for. This 1° change in our setpoint increased our cleanroom average temperature to 71° with fluctuations of ±1°.

10112011 CleanroomTemperature 3.png

There was no stringing done this morning.

The temperature set point was changed back to 68°.

10112011 CleanroomTemperature 4.png

Stringing resumed once temperatures were within acceptable levels (~11 AM).

Average temperatures remained right at 70° with ±1° fluctuations the remainder of the day, even with both of us stringing and measuring tensions.

10112011 CleanroomTemperature 5.png 10112011 CleanroomTemperature 6.png

Even with not stringing this morning, Marcie and I still managed to string 63 wires today.

CLAS12_R1