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test_chamber

Table of Contents

gems_test_chamber_080808.jpg

Chamber Design

Gas Handling

Primary Contact: Gary Westfall
Secondary Contact: Hui Wang

Describe current gas system
Provide operational instructions
Detail problems with system
Gary & Hui's plans

Flammable Gas Safety Review

Primary Contact: Daisuke Suzuki
Secondary Contact: Krista Cruse

« The 1st meeting »
2009/4/30 @ Seminar room
Participants: David Erickson, Peter Grivin, WM, AB, KC, DS

« The 2nd meeting »
2009/5/15 10h - 11h @ Theory library
Participants: DE, PG, Ashley Garrett, John Yurkon, WM, HW, DS

  • We agreed on the new gas flow scheme.
  • We are going to change the gas flow system based on the new scheme. After completing the new system, we will go through a gas safety review.
  • To do: Making the work order.

Slides:
:newgasflowcircuit_definitive_09-05-15_.pdf

Hydrogen gas safety guide by Los Alamos:
:hydrogengassafety.pdf

Gas Handler Modification


Purchase Order List Last Update August 6, 2009

Material List Last Update June 29, 2009

Gas Flow Scheme Last Update June 18, 2009

Design of the new gas handler Last Update August 4, 2009

Front Panel Cross Section A Cross Section B Cross Section C0 Cross Section C1 Cross Section C2 Fixer Top Plate Bottom Plate Side Plate Support 01 Support 02

(Minimum version)
Front Panel Top Plate Bottom Plate Side Plate

Work order (submitted to NSCL 7/08/2009)
ID: 2888-001-MD-001
7/08-7/15/2009: With contact person
7/15/2009: Rejected; will be handled by detector lab per Mantica/Morrissey.
7/16/2009: Resubmitted
ID: 2888-000-FC-002
7/21/2009: Cancelled.

Work order (submitted to the physics department)
Contact:
Thomas Palazzolo, Instrument Shop Manager
palazzolo@pa.msu.edu
(517)884-5540

Physics shop workorder form
Internal components to the physics machine shop

8/6/2009 9-10h @#1213, BPS buiding; Meeting
8/20/2009 @NSCL machine shop; KF25 flanges was welded on both the ends of the flexible tube that connects the pump exhaust to the vent.
8/21/2009 @BPS; The box (w/o the front panel), piping pieces and fixers have already been made.
8/21/2009 @N1; The flexible tube for vent was installed.
9/30/2009 @N1; Completed.

Leak Testing

February 2009:

  • Pressure: steady at <10mTorr
  • Leak Rate: 2×10^-8 mL/s, 0.2 Torr/hr
  • small leaks around o-rings of door ⇒ o-ring replaced

April 2009:

  • new leak tests performed by Daisuke & Wolfi
  • update current status here

High Voltage

Primary Contact: Krista Cruse
Secondary Contact: ????

High Voltage Supplies
Two high voltage supplies are currently in use with the test chamber. A 20kV Bertan supply, model 205B-20R and a 2 channel 5kV programmable CAEN supply, model N570. These supplies are currently being used to power the cathode and the active components (GEMs and Micromegas) of the chamber.

Manuals
:bertan_high_voltage_supply_manual_model_205b.pdf
:caen_high_voltage_supply_model_n570.pdf

Operational instructions
Bertan Supply

  • Can be operated as positive or negative polarity.
  • 20kV maximum with 1mA current and 300mV ripple.
  • LED monitor has switch for voltage and current output readings.

CAEN Supply

  • 2 channels with polarity selection.
  • Voltage-Current ranges: 0 to +/-10kV at 1mA and +/-10kV to +/-15kV at 0.5mA
  • Programmable via front panel keyboard or CAENET network software (remotely).
  • Numerous programmable parameters including voltage and current limits, ramp speeds, current trip levels and times. Refer to page 12 of manual for full programmable settings.

Voltage divider circuits

Gas Electron Multipliers

Electronics & DAQ

Primary Contact: Daisuke Suzuki
Secondary Contact: Hui Wang

Document
Canberra Model 2006 (Preamplifier) manual:2006_ss.pdf
Canberra Series 35+ (MCA) manual:series35_.pdf
Data acquisition with FemStuc :data_acquisition_with_the_femstuc.doc
Data Analysis :data_analysis.pdf
T2K Electronics http://groups.nscl.msu.edu/tpc/wiki/doku.php?id=t2k
- DAQ configurations for calibrations using the on-board pulser (8.21.2009 DS)

Documentation for running the electronics in calibration mode
:t2k_calibration_mode.doc

Computing

Primary Contact: Abby Bickley
After acquiring data from the test chamber it should be transferred off of the daq laptop for analysis. A group account has been established on the NSCL farm for this purpose.
- account name: tpcdev
- account pwd: email Abby if you don't know
To transfer the data follow these instructions.

The data can be accessed from any computer using the group account or your personal NSCL account. If you choose to write files using your personal account please make sure your permissions are set to allow group read and write access to facilitate group disk management. To facilitate group file management I suggest that you create a directory named as your nscl username to store all of your code and processed files. Creation of this directory will be a good test of whether you have write access to the group directories.

Two directories have been created for our use. Each has its distinct purpose. Please follow these standards.
- /projects/proj2/e09043/: this space is backed up by the lab and is designated for saving code; do not store data or large root files here.
- /evtdata/e09043/: this space is not backed up by the lab and is designated for saving data; do not store code in this directory; a recent catastrophic failure resulted in the loss of these disks.


Tracking

NIFFTE Virtual Machine file and README: http://nuclear.calpoly.edu/~niffte/NiffteVM/
Sparsely populated NIFFTE homepage: http://nuclear.calpoly.edu/~niffte/
NIFFTE manual V1
:NIFFTE_Software_Manual


Triggering

Primary Contact: Hui Wang
Secondary Contact: Krista Cruse

update with detailed info of cosmic trigger setup and operation

Laser System

Primary Contact: Wolfgang Mittig
Secondary Contact: Terry Tarnowsky

update with design & construction plans

Work Plan



Meeting Archive

test_chamber.txt · Last modified: 2010/06/21 18:26 by 127.0.0.1