Active Collimator

• Active collimator prototyping and beam tests
• Richard's DNP-2012 presentation on the Hall D active collimator
• Igor's notes on the preamplifier power supply and control unit
• University of Connecticut Active Collimator Station Tutorial

Notes from meetings with Accelerator Group

• January 14, 2013
• February 4, 2013
• March 5, 2013
• July 31, 2013

High Speed DAQ for the Active Collimator

List of EPICS PVs

Here are the waveform records with size of 8192, N9 are inner and N10 are outer:

• iochdcol:BPM:N9:raw_XP
• iochdcol:BPM:N9:raw_XM
• iochdcol:BPM:N9:raw_YP
• iochdcol:BPM:N9:raw_YM
• iochdcol:BPM:N10:raw_XP
• iochdcol:BPM:N10:raw_XM
• iochdcol:BPM:N10:raw_YP
• iochdcol:BPM:N10:raw_YM

These are the 16-bit count readings for individual plates that are always available and filtered down to ~1Hz (same order as above):

• IOCHDCOL:VMICADC1_1
• IOCHDCOL:VMICADC2_1
• IOCHDCOL:VMICADC3_1
• IOCHDCOL:VMICADC4_1
• IOCHDCOL:VMICADC1_2
• IOCHDCOL:VMICADC2_2
• IOCHDCOL:VMICADC3_2
• IOCHDCOL:VMICADC4_2

And the gains:

• IPMHDACI_GainSub
• IPMHDACI_GAINXP
• IPMHDACI_GAINXM
• IPMHDACI_GAINYP
• IPMHDACI_GAINYM
• IPMHDACO_GainSub
• IPMHDACO_GAINXP
• IPMHDACO_GAINXM
• IPMHDACO_GAINYP
• IPMHDACO_GAINYM

High Speed ROOT File Writer

An EPICS IOC server is set up on gluon29.jlab.org:26064 to write the raw waveform data to /gluonraid1/Users/ac directory on demand.

The control of this High Speed DAQ can be found in Hall-D's EPICS GUI:

1. Open CSS EPICS Control following instructions
2. From Main Action Bar, open Active Collimator GUI.
3. Start or Stop the High Speed ROOT File by clicking the button underneath the title.
4. Once started, make sure the a new ROOT file is created and the File Size is increasing.

In very rare occasions, e.g. some one rebooted the AC DAQ server, the writer IOC needs to be restarted

Reboot using command lines;

1. Log onto gluon29 using hdsys account
2. telnet localhost 26064
3. Restart the IOC by keyboard combination Ctrl+X
4. Exit the IOC proServer by keyboard combination Ctrl+]
5. Exit the telnet by typing quit

Analyze the Raw Data

From Active Collimator GUI

1. Click the Analyzer button in the PXI Fast DAQ section.

From a Linux terminal

1. log onto a gluon machine, e.g. gluon30.jlab.org, using account hdops: ssh -X hdops@gluon30
2. enter acanalyzer directory: cd ~\acanalyzer
3. start the analyzer script: ./run
4. in the analyzer, open a collection of raw data files or a processed ROOT file and start the analysis.