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Design & Simulation of High Energy Thermionic Electron Beam Gun Accelerators Applications

Thesis Info

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Author

Islam, Ghalib Ul

Program

PhD

Institute

University of the Punjab

City

Lahore

Province

Punjab

Country

Pakistan

Thesis Completing Year

2017

Thesis Completion Status

Completed

Subject

Physics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/7993/1/Ghalib%20PhD%20Thesis.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725820633

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Design, simulation and test of four types of thermionic DC electron beam guns; hairpin source, strip source, line source and disc source have been evaluated. Beam optics analyses were performed using SLAC electron beam trajectory program (EGUN) and CST Particle Studio (CST-PS). The guns are in diode configurations with planar geometry of the electrodes. The focusing electrodes were placed at the same potential of cathode without any extra biasing or Whenelt electrode. From these novel designs well focused and parallel beams of electrons with beam current (42mA-12A), emission density (5.04-6.72 A/cm2), power density (5.04×104-6.72×104 W/cm2) and normalized emittance (0.51-31.72 π-mm-mR) were obtained. The simulated results were verified by experimental tests at 10 kV of acceleration potential. The designs are simple and inexpensive. These guns are useful for metallurgical applications and for electron optical devices due to high current and power densities. Moreover, these are also useful for accelerator technology due to high emission and low emittance parameters
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سگمنڈ فرائڈ

سگمنڈ فرائڈ
گذشتہ ستمبر میں آسٹریلیا کے مشہور محلل نفسی سگمنڈ فرایڈ کا پچاسی سال کی عمر میں لندن میں انتقال ہوگیا۔
نفسیات میں اس کا موضوع جنسی جبلت تھا، پچاس برس تک وہ اس پر غور و فکر کرتا رہا، شروع میں اس نے پانچ سال تک وائنا میں عصبی المزاجی پر تحقیقات کی، ۱۸۹۶؁ء میں جب اس نے اپنے لکچروں میں یہ دعویٰ کیا کہ عصبی المزاج اشخاص کے مرض کا سبب ان کی جنسی جبلت میں پایا جاتا ہے، تو عام طور سے اسے مضحکہ انگیز سمجھا گیا، لیکن عصبی المزاجی کے مریض رفتہ رفتہ سگمنڈ فرائڈ کی طرف رجوع کرنے لگے، ان میں بعض ایسے تھے، جو جانوروں سے غیر معمولی طور سے خوفزدہ رہتے تھے یا گفتگو میں ہکلاتے تھے، یا تھوڑی تھوڑی دیر کے بعد اپنے ہاتھوں کو پانی سے دھوتے رہتے تھے، یا سر کے درد یا کسی اور بیماری میں مدتوں سے مبتلا رہتے تھے، یا ان کے ہاتھ اور پاؤں مفلوج تھے، ان میں سے اکثر جنون کی حد تک پہنچ چکے تھے، فرائڈ ان تمام امراض کا علاج نفسیاتی طریقہ سے کرنا چاہتا تھا، مگر اس سے اس کو اب تک واقفیت نہیں ہوئی تھی۔
اس قسم کے امراض کا علاج عموماً مصنوعی نیند کے ذریعہ سے کیا جاتا تھا، ایک دن فرائڈ کے ایک دوست ڈاکٹر جوزف بردار نے اس سے اپنی ایک مریضہ کا واقعہ بیان کیا، مریضہ کی عمر اکیس سال تھی، اس کا باپ ایک مہلک مرض میں مبتلا تھا، وہ اس کی تیمارداری کرتی تھی، کہ ایک دن اس کے داہنے ہاتھ اور دونوں پیروں میں فالج گرگیا، ڈاکٹر مذکور نے مصنوعی نیند کی حالت میں مریضہ سے مختلف سوالات کئے، اس سے مرض کے تمام علامات ظاہر ہوتے گئے، تیمارداری کے زمانہ میں لڑکی نے اپنی بہت سی خواہشوں کو...

PENDIDIKAN ISLAM PADA MASA RASULLAH SAW. (PERIODE MEKAH DAN MADINAH)

Islamic education today cannot be separated from Islamic education in Islamic classical era. The Prophet Muhammad has served as a central figure of Islamic education from Islamic classical era to modern Era. The implementation of Islamic education in the time of the Prophet Muhammad can be categorized into Meccan period and Medina Period. In Meccan period, the prophet  put emphasis on tawhid, who used to adhare to politism, to adhare to monotism, that is to believe in Allah the only God. The strategy of education employed by the prophet was secret in nature. Initially, he conducated Islamic education amongst the members of his family and his companions then  to more extended cummunity. In Mecca, the Prophet made the house of al-Arqam ibn Abi Al-Arqam, as the centre of  Islamic education.  In Medinan period, the prophet conducted more complex  Islamic  education  than that  he did in Mecca. Islamic education conducted to covered  (a) Islamic brotherhood; (b) social walfare education;   and (c) nation defence education. In this period, it was mosque that served as the centre of Islamic education.

Characterization of Okra Genotypes for Horticultural Traits, Potassium Uptake Efficiency and Performance under Deficit Irrigation

Okra is a promising vegetable crop famous in many countries for its young, green and tender fruits which are used for edible purpose. Diversity exists among okra genotypes for their growth and yield related traits. Moreover, growth and yield of okra is also affected by several factors; availability of nutrients, their uptake and irrigation are important besides the environmental factors. A study was conducted to investigate the variation among local and exotic okra genotypes using morphological markers and heritability studies, potassium uptake and use efficiency under normal and water deficit conditions. For this purpose, three experiments were conducted. In 1st experiment, 24 genotypes were raised till maturity in randomized complete block design (RCBD) with three replications and each replication comprised of fifteen plants. Morphological, yield and quality related traits were noticed and huge variation was observed among genotypes for traits related to yield of okra. Interestingly, heritability parameters including genotypic and phenotypic coefficient of variation (GCV and PCV) as well as broad sense heritability (H2) confirmed that most of the studied characters including plant height, number of leaves, days to flowering, internodal length, fruiting span and fruit number, length, girth and weight as well as fruit yield plant-1 were genetically controlled, which indicated that selection of desired traits can be effective for crop improvement of okra. 2nd experiment was executed with 24 local and exotic okra genotypes with four different levels of potash (0 kg ha-1 MOP, 75 kg ha-1 MOP, 150 kg ha-1 MOP, 225 kg ha-1 MOP) in RCBD factorial arrangement with three replications, to assess the effect of potash on growth indices and potassium uptake as well as potassium use efficiency. Significant differences were noticed for measured growth indices and potassium uptake among okra genotypes at varying levels of applied potassium. All growth related traits were improved by potash application upto 150 Kg ha-1 MOP, but further increase in potash did not result in significant enhancement of growth attributes. GCV, PCV and H2 showed significant variation in genotypes for their potassium uptake and use efficiency. High heritability for studied traits depicted that breeding for potassium use efficiency is possible on the basis of identified promising genotypes (Rama Krishna, Ikra-02 and Line Brand, Ikra-04). In 3rd experiment, 24 okra genotypes were assessed for their genetic potential to tolerate deficit irrigation. Three levels of irrigation including, full irrigation (control), 25% deficit irrigation and 50% deficit irrigation, were provided under field conditions. This experiment was executed in RCBD factorial arrangement with three replications. Significant differences were noticed among different okra genotypes for their tolerance to deficit irrigation. Although, 50% deficit irrigation severely reduced the growth indices, but these reductions were less in tolerant genotypes (Rama Krishna, Ikra-02, Line Brand, Ikra-04 ) as compared to sensitive ones. Leaf relative water contents of tolerant genotypes were high even under 50% deficit irrigation as compared to sensitive okra genotypes. Antioxidant activity, proline and total soluble sugars were increased in genotypes under deficit irrigation treatments but this increase was significantly higher in tolerant genotypes as compared to sensitive ones. Leaf nitrogen, phosphorus and potassium contents were also adversely affected due to deficit irrigation. However, N, P and K concentration was high in tolerant genotypes even at 50% deficit irrigation. High values of GCV and H2 were observed for most of the characters at 50% deficit irrigation level, which showed that selection is effective for desirable traits of okra under severe deficit irrigation to develop high yielding drought tolerant okra genotypes through effective selection and breeding.