Improvements HRRL Positron Runs July 2012 - Revision history

Setisadi at 09:30, 2 August 2012

2012-08-02T09:30:24Z

2012-08-01T18:45:06Z

Positron rate measurements

2012-08-01T18:36:45Z

Measure Positron Momentum distribution

2012-08-01T17:55:02Z

Measure electron momentum distribution

2012-08-01T17:50:41Z

Calibrate beam current monitor

2012-08-01T17:45:35Z

Bending the beam 90 deg

2012-08-01T17:39:28Z

Bending the beam 90 deg

2012-08-01T02:47:39Z

Tune electron beam

2012-07-31T19:13:43Z

2012-07-31T17:54:24Z

@@ Line 11: / Line 11: @@
 . It seems we don't need the ion pump at 90 deg beamline, it can be removed next time.
-.
+. The 511 keV peak from the runs seems to apear at higher energy region than the 511 keV from Na22 source spectrum. So, I want to run some runs (T2 in and out) with Na22 source near the NaI detectors. See if the the peaks (511 from Na22 and 511 from target 1) is going to overlap or appear separately.
 =Run Plan=

← Older revision		Revision as of 18:45, 1 August 2012
Line 83:		Line 83:
	==Positron rate measurements==		==Positron rate measurements==

−	Target in , Target out, Sweep magnet	+	Target in , Target out, Sweep magnet.
		+
		+	1. Target in run: Put the T2 (Annihilation target) at the end of the 90 deg in, start DAQ rund with NaI detectors left and right, and with scintillator.
		+
		+	2. Target out run: Take the T2 out, do another similar run with DAQ.
		+
		+	3. Put the T2 in, put the sweeping magnet in, do another measurement. (Sweeping magnet in run is optional, the results are similar with target out runs.

@@ Line 62: / Line 62: @@
 ==Measure Positron Momentum distribution==
 ==Positron rate measurements==
 Target in , Target out, Sweep magnet

← Older revision		Revision as of 17:55, 1 August 2012
Line 53:		Line 53:

	===Measure electron momentum distribution===		===Measure electron momentum distribution===
		+	Momentum of the electron beam can be done by bending the electron beam by dipole 1 (D1), and observe the bent beam at the 45 deg Faraday cup (FC45).
		+
		+	1. Bend the beam using D1, turn off D2.
		+
		+	2. Observe the beam at FC45.
		+
		+	3. Start from lower coil current on D1, increase by steps. The current on the FC45 should increase first, then decrease. Save the scope images with the area of the current measured.

	==Measure Positron Momentum distribution==		==Measure Positron Momentum distribution==

← Older revision		Revision as of 17:50, 1 August 2012
Line 45:		Line 45:

	===Calibrate beam current monitor===		===Calibrate beam current monitor===
		+
		+	1. Set the current at the scintillator to 500 V (this is for Dr. Dale's scintillator, for others scintillaotr start from lower voltage).
		+
		+	2. Set the current of the accelerator for full current.
		+
		+	3. Decrease the current of the accelerator by steps. For example:0.8, 0.6, 0.4, 0.2, 0.1 of the full current.

	===Measure electron momentum distribution===		===Measure electron momentum distribution===

@@ Line 42: / Line 42: @@
 . Turn on Dipoles, set them to turn same energy.
-. Bend the beam
+. Bend the beam, beam can be observed by Faraday cup. The current is small. Energy scan and currents transmission measurements can be done.
 ===Calibrate beam current monitor===

← Older revision		Revision as of 02:47, 1 August 2012
Line 15:		Line 15:

	==Tune electron beam==		==Tune electron beam==
		+
		+	=== Tune Energy ===
		+
		+	1. Put the RF power knob desired energy region.
		+
		+	2. Tune RF first, then solenoids to get some current on the 0 deg Faraday cup.
		+
		+	3. Bend the beam 45 to scan the energy using Faraday cup at 45 deg exit.
		+
		+	4. Tune the RF power knob and repeat above steps to get the desired energy.
		+
		+	=== Tune to maximize current ===
		+
		+	1. Tune RF first, then Solenoids to get some current on the Faraday cups.
		+
		+	2. Use gun steerers to maximize the current on the FC.
		+
		+	3. Use output steerers to maximize the current on the FC.
		+
		+	4. Use quads to maximize current on the Faraday cup.
		+
		+	5. If the energy of the beam is higher than 12 MeV, electron beam can be observed. Beam size can be minimized by using OTR screen.
		+
		+	=== Bending the beam 90 deg ===
		+
		+	1. Turn on Dipoles, set them to turn same energy.
		+
		+

	===Calibrate beam current monitor===		===Calibrate beam current monitor===

← Older revision		Revision as of 19:13, 31 July 2012
Line 12:		Line 12:

	7.		7.
		+	=Run Plan=
		+
		+	==Tune electron beam==
		+
		+	===Calibrate beam current monitor===
		+
		+	===Measure electron momentum distribution===
		+
		+	==Measure Positron Momentum distribution==
		+
		+	==Positron rate measurements==
		+
		+	Target in , Target out, Sweep magnet

@@ Line 1: / Line 1: @@
-. T2 holder made without vertical 45 deg angle.
+. Make T2 holder without vertical 45 deg angle.
-. Improve TDC inputs.
+. Improve TDC inputs, and DAQ system (use veto on the CFD).
 . Put better (more sensitive, thicker) scintillator at the exit of 90 deg, so I can measure the numbers of positrons.