Difference between revisions of "Wednesday December 11, 2013"
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1- New "5 MeV" Dipole update [[media:new_5Mev_dipole_Nov20.pdf]] | 1- New "5 MeV" Dipole update [[media:new_5Mev_dipole_Nov20.pdf]] | ||
| − | 2- The accelerator will fund (as part of running | + | 2- The accelerator will fund (as part of running CEBAF (RSR) in FY14): |
- New dipole magnet and a Hall probe system: GMW DTM-151 [http://www.gmw.com/magnetic_measurements/Group3/DTM-151_Specs.html]. The Group3 DTM-151 is the highest performance Hall effect | - New dipole magnet and a Hall probe system: GMW DTM-151 [http://www.gmw.com/magnetic_measurements/Group3/DTM-151_Specs.html]. The Group3 DTM-151 is the highest performance Hall effect | ||
teslameter commercially available with digital linearity and temperature correction to provide 0.01% accuracy, resolution to 2ppm, | teslameter commercially available with digital linearity and temperature correction to provide 0.01% accuracy, resolution to 2ppm, | ||
| Line 28: | Line 28: | ||
* New Dipole Magnet: | * New Dipole Magnet: | ||
| − | - We may build two dipoles depending on the cost of one vs two. | + | - We may build two dipoles depending on the cost of one vs two. We have enough steel for two. |
- A spare set of coils will be also made. | - A spare set of coils will be also made. | ||
| − | - Mapping will be done with the Hall Probe | + | - Mapping will be done with the Hall Probe impeded in the magnet. |
| − | - Need new fixture to mount the dipole on that allows for | + | - Need new fixture to mount the dipole on that allows for alignment adjustments. |
* Beamline: | * Beamline: | ||
| − | - The design of the beamline should include an Earth Field | + | - The design of the beamline should include an Earth Field correcting coil. For the absolute beam energy measurement, the biggest |
| − | error could be the correction for the earth's magnetic field. We should have a coil that span our beamline to cancel | + | systematic error could be the correction for the earth's magnetic field. We should have a coil that span our beamline to cancel |
| − | earth's field. | + | the earth's field. |
- So far, we are unable to locate the radiator chamber used during PEPPo. Maybe it is in the Magnet Lab? The solenoid attached | - So far, we are unable to locate the radiator chamber used during PEPPo. Maybe it is in the Magnet Lab? The solenoid attached | ||
to the chamber is there for mapping. | to the chamber is there for mapping. | ||
| + | - There is a fast valve just before the 0L03 cryo-unit. Is it possible to have the gauge of that valve to close both the | ||
| + | existing valve the new fast valve? ''i.e.'', can the new fast valve share electronics with the fast valve on the other side | ||
| + | of the Injector? | ||
- We will use an excess dipole magnet as a Sweep Magnet (we have this magnet in our cabinet in the Injector Service Building). | - We will use an excess dipole magnet as a Sweep Magnet (we have this magnet in our cabinet in the Injector Service Building). | ||
We will increase the size of the gap to fit the larger beam pipe expected after the radiator. For this we will use excess steel | We will increase the size of the gap to fit the larger beam pipe expected after the radiator. For this we will use excess steel | ||
Revision as of 11:51, 12 December 2013
We will meet in TED 2561B on Wednesday December 11 at 3:00 pm EST.
For those calling in we'll use the ReadyTalk audio conference system.
1. Dial Toll-Free Number: 866-740-1260 (U.S. & Canada) 2. Enter 7-digit access code 4402297, followed by “#”
Agenda:
1- New "5 MeV" Dipole update media:new_5Mev_dipole_Nov20.pdf
2- The accelerator will fund (as part of running CEBAF (RSR) in FY14):
- New dipole magnet and a Hall probe system: GMW DTM-151 [1]. The Group3 DTM-151 is the highest performance Hall effect teslameter commercially available with digital linearity and temperature correction to provide 0.01% accuracy, resolution to 2ppm, and a temperature stability of 10ppm/°C. - New fast valve and its electronics media:275218EC_Manual.pdf media:752_1VFE.pdf. Total closing time <10 ms.
3- Latest drawing of Bubble Chamber beamline: media:Bubble_Chamber_BeamLine_Drawing_top.pdf media:Bubble_Chamber_BeamLine_Drawing_side.pdf (units of the drawing are inches) and side-view elevation:
4- Bubble Chamber progress at Argonne
5- Draft of the Accelerator Seminar talk (on Thursday January 9, 2014): media:Acc_Seminar.pdf media:Acc_Seminar.pptx. More work is still needed on Theory, Previous Experiments, and Bubble Chamber.
Notes from this meeting:
- New Dipole Magnet:
- We may build two dipoles depending on the cost of one vs two. We have enough steel for two. - A spare set of coils will be also made. - Mapping will be done with the Hall Probe impeded in the magnet. - Need new fixture to mount the dipole on that allows for alignment adjustments.
- Beamline:
- The design of the beamline should include an Earth Field correcting coil. For the absolute beam energy measurement, the biggest systematic error could be the correction for the earth's magnetic field. We should have a coil that span our beamline to cancel the earth's field. - So far, we are unable to locate the radiator chamber used during PEPPo. Maybe it is in the Magnet Lab? The solenoid attached to the chamber is there for mapping. - There is a fast valve just before the 0L03 cryo-unit. Is it possible to have the gauge of that valve to close both the existing valve the new fast valve? i.e., can the new fast valve share electronics with the fast valve on the other side of the Injector? - We will use an excess dipole magnet as a Sweep Magnet (we have this magnet in our cabinet in the Injector Service Building). We will increase the size of the gap to fit the larger beam pipe expected after the radiator. For this we will use excess steel from the piece we have on-hand.
- Bubble Chamber progress:
- Brad expressed concerns about the positioning of the Chamber at JLab. He is working with Shaun Gregory to resolves any issues. - Brad is in contact with JLab Facility electrical engineer (Paul Powers) to formulate a plan to deal with the power requirements of the Chiller.
- Next meeting: Wednesday January 8 or 15.